WO2000072811A1

WO2000072811A1 - Method of treating hair loss

Info

Publication number: WO2000072811A1
Application number: PCT/US2000/005250
Authority: WO
Inventors: Lixin Lilly Zhang; Robert Scott Youngquist
Original assignee: The University Of Texas Southwestern Medical Center
Priority date: 1999-06-01
Filing date: 2000-03-01
Publication date: 2000-12-07
Also published as: AU3507500A; MXPA01012492A; JP2003500431A; AR018470A1; EP1185229A1; CA2374262A1

Abstract

The present disclosure describes methods for treating hair loss in mammals, including arresting and/or reversing hair loss and promoting hair growth. The methods comprise administering a cardiac-sparing coumpound having a structure as described herein and a pharmaceutically-acceptable carrier.

Description

METHOD OF TREATING HAIR LOSS

FIELD OF THE INVENTION

The present invention relates to methods for treating hair loss in mammals, including arresting and / or reversing hair loss and promoting hair growth

BACKGROUND OF THE INVENTION

Hair loss is a common problem which occurs, for example, through natural processes or is often chemically promoted through the use of certain therapeutic drugs designed to alleviate conditions such as cancer Often such hair loss is accompanied by lack of hair regrowth which causes partial or full baldness.

As is well-known in the art, hair growth occurs by a cycle of activity which involves alternating peπods of growth and rest. This cycle is often divided mto three mam stages which are known as anagen, catagen, and telogen. Anagen is the growth phase of the cycle and may be characterized by penetration of the hair follicle deep mto the dermis with rapid proliferation of cells which are differentiating to form hair. The next phase is catagen, which is a transitional stage marked by the cessation of cell division, and duπng which the hair follicle regresses through the dermis and hair growth is ceased. The next phase, telogen, is often characteπzed as the resting stage duπng which the regressed follicle contains a germ with tightly packed dermal papilla cells. At telogen, the initiation of a new anagen phase is caused by rapid cell proliferation m the germ, expansion of the dermal papilla, and elaboration of basement membrane components. Wherein hair growth ceases, most of the hair follicles reside m telogen and anagen is not engaged, thus causing the onset of full or partial baldness.

There have been many attempts in the literature to invoke the regrowth of hair by, for example, the promotion or prolongation of anagen. Currently, there are two drugs approved by the United States Food and Drug Administration for the treatment of male pattern baldness: topical mmoxidil (marketed as Rogame^® by Pharmacia & Upjohn), and oral fϊnasteπde (marketed as Propecia^® by Merck & Co., Inc.). For several reasons, however, including safety concerns and / or lack of efficacy, the search for efficacious hair growth mducers is ongoing.

Interestingly, it is known that the thyroid hormone known as thyroxme ("T4") converts to thyronme ("T3") in human skin by deiodmase I, a selenoprotem. Selenium deficiency causes a decrease in T3 levels due to a decrease in deiodmase I activity; this reduction in T3 levels is strongly associated with hair loss. Consistent with this observation, hair growth is a reported side effect of administration of T4. See, e.g . Berman, "Peripheral Effects of L-Thyroxme on Hair Growth and Coloration in Cattle", Journal of Endocrinology, Vol. 20, pp. 282 - 292 (1960), and Gunaratnam, "The Effects of Thyroxine on Hair Growth in the Dog", J Small Amm Pract , Vol. 27, pp. 17 - 29 (1986). Furthermore, T3 and T4 have been the subject of several patent publications relating to treatment of hair loss. See, e.g , Fischer et al.. DE 1,617,477, published January 8, 1970; Mortimer, GB 2,138,286, published October 24, 1984; and Lindenbaum, WO 96/25943, assigned to Life Medical Sciences, Inc., published August 29, 1996.

Unfortunately, however, administration of T3 and / or T4 to treat hair loss is not practicable because these thyroid hormones are also known to induce significant cardiotoxicity. See, e.g.. Walker et al., U.S. Patent No. 5,284,971, assigned to Syntex, issued February 8, 1994 and Emmett et al.. U.S. Patent No. 5,061,798, assigned to Smith Kline & French Laboratories, issued October 29, 1991. Surprisingly, however, the present inventors have discovered compounds which promote hair growth without inducing cardiotoxicity. Consistent with this discovery, but without intending to be limited by theory, the present inventors have surprisingly discovered that the compounds useful in the present invention interact strongly with hair- selective thyroid hormone receptors but interact less strongly, or not at all, with heart-selective hormone receptors. These unique properties are, of course, not shared with T3 and / or T4. Accordingly, the compounds described for use m the methods and compositions herein are cardiac-sparing compounds useful for treating hair loss, including arresting and / or reversing hair loss and promoting hair growth.

SUMMARY OF THE INVENTION

The present invention relates to methods for treating hair loss comprising administering a compound which has been found by the present inventors to be particularly useful for treating hair loss m mammals, including arresting and / or reversing hair loss and promoting hair growth. The compounds utilized in the present method have the structure:

and pharmaceutically acceptable salts, hydrates, and biohydrolyzable amides, esters, and imides thereof, wherein R], R₂, R₃, R , R₅, Re, Ris, ₁9, and X are defined herein.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to methods of using compounds and compositions which are particularly useful for treating hair loss in mammals, including arresting and / or reversing hair loss and promoting hair growth.

In addition to discovering that the present compounds are useful for treating hair loss, the present inventors have also surprisingly discovered that the preferred compounds are cardiac-sparing. The preferred compounds useful in the method of the present invention are therefore, as defined herein below, cardiac-spaπng.

Publications and patents are referred to throughout this disclosure All references cited herein are hereby incorporated by reference.

All percentages, ratios, and proportions used herein are by weight unless otherwise specified.

In the descπption of the invention various embodiments and/or individual features are disclosed. As will be apparent to the ordinarily skilled practitioner all combinations of such embodiments and features are possible and can result in preferred executions of the invention.

As used herein, wherein any variable, moiety, group, or the like occurs more than one time in any vaπable or structure, its definition at each occurrence is independent of its definition at every other occurrence.

Definition and Usage of Terms

The following is a list of definitions for terms used herein:

As used herein, "alkanoyl" is an alkyl substituted with oxo (C=O).

As used herein, "alkoxy" is an oxygen radical having an alkyl, alkenyl, or alkynyl, preferably an alkyl or alkenyl, and most preferably an alkyl substituent. Examples of alkoxy radicals include -O-alkyl and -O-alkenyl. An alkoxy radical may be substituted or unsubstituted.

As used herein, "alkyl" is an unsubstituted or substituted saturated hydrocarbon chain radical having from 1 to about 15 carbon atoms; preferably from 1 to about 10 carbon atoms; more preferably from 1 to about 6 carbon atoms; and most preferably from 1 to about 4 carbon atoms. Preferred alkyls include, for example, methyl, ethyl, propyl, zsø-propyl, and butyl.

As used herein, "aryl" is an aromatic πng radical which is either carbocychc or heterocychc. Preferred aryl groups include, for example, phenyl, benzyl, tolyl, xylyl, cumenyl, napthyl, biphenyl, thienyl, furyl, pyrrolyl, pyridmyl, pyrazmyl, thiazolyl, pyrimidmyl, quinohnyl, triazolyl, tetrazolyl, benzothiazolyl, benzofuryl, mdolyl, indenyl, azulenyl, fluorenyl, anthracenyl, oxazolyl, isoxazolyl, isotriazolyl, imidazolyl, pyraxolyl, oxadiazolyl, mdolizmyl, mdolyl, isoindolyl, puπnyl, quinohzinyl, quinohnyl, isoquinolinyl, cmnolmyl, and the like. Aryls may be substituted or unsubstituted.

As used herein, "arylalkyl" is an alkyl radical substituted with an aryl group or an aryl radical substituted with an alkyl group. Preferred arylalkyl groups include benzyl, phenylethyl, and phenylpropyl. Arylalkyls may be substituted or unsubstituted.

As used herein, "biohydrolyzable amides" are amides of the compounds used m the present invention which do not interfere with the activity of the compound, or that are readily converted in vivo by a mammalian subject to yield an active compound.

As used herein, "biohydrolyzable esters" are esters of the compounds used m the present invention which do not interfere with the activity of the compound, or that are readily converted in vivo by a mammalian subject to yield an active compound.

As used herein, "biohydrolyzable imides" are imides of the compounds used m the present invention which do not interfere with the activity of the compound, or that are readily converted in vivo by a mammalian subject to yield an active compound.

As used herein, "cycloalkyl" is a saturated carbocychc or heterocychc πng radical. Preferred cycloalkyl groups include, for example, cyclobutyl, cyclopentyl, and cyclohexyl. Cycloalkyls may be substituted or unsubstituted.

As used herein, preferred "halogens" (or "halos" or the like) are bromine, chlorine, iodine, and fluorine, more preferably, bromine, chlorine, and iodine, even more preferably bromine and chloπne, and most preferably chlorine.

As used herein, "pharmaceutically acceptable" means suitable for use in a human or other mammal.

As used herein, "safe and effective amount of a compound" (or composition, or the like) means an amount that is effective to exhibit biological activity, preferably wherein the biological activity is arresting and / or reversing hair loss or promoting hair growth, at the sιte(s) of activity m a mammalian subject, without undue adverse side effects (such as toxicity, irritation, or allergic response), commensurate with a reasonable benefit / πsk ratio when used m the manner of this invention.

As used herein "salt" is a catiomc salt formed at any acidic (e.g , carboxyl) group, or an anionic salt formed at any basic (e g., ammo) group. Many such salts are known in the art. Preferred catiomc salts include the alkali metal salts (such as, for example, sodium and potassium), alkaline earth metal salts (such as, for example, magnesium and calcium), and organic salts. Preferred anionic salts include the halides (such as, for example, chloride salts) Such acceptable salts must, when administered, be appropriate for mammalian use.

Methods of the Present Invention The present invention relates to methods of treating hair loss comprising administering a composition comprising a compound having the structure

and pharmaceutically acceptable salts, hydrates, and biohydrolyzable amides, esters, and imides thereof, wherein:

(a) X is selected from oxygen, sulfur, and CH₂;

(b) R, and R₂ are each, independently, selected from hydrogen, halogen, hydroxy, tπfluoromethyl, Cj - C₆ alkyl, - C₆ alkenyl, and - C₄ alkoxy;

(c) R₃ is selected from hydrogen, alkyl, aryl, and arylalkyl;

(d) R, is selected from R₄ is selected from the group consisting of hydrogen, halogen, Ci - C₄ alkyl, - C₄ alkenyl, hydroxy, and - C₄ alkoxy;

(e) R₅ is selected from hydrogen, halogen, hydroxy, alkyl, - C₄ alkenyl, Ci - C₄ alkoxy, cycloalkyl, aryl, and arylalkyl;

(f) Re is selected from alkyl, aryl, -CH₂CH(NH₂)CO₂H, -CH₂CH(OH)CO₂H, - CH₂CR₇R₈NR₉R₁₀, -YC(O)R„, -(CH₂)_n-OH, -CH₂C(R₁₂)(NH₂)CO₂R₁₃, - CH₂CH(COOH)(NH)C(O)(CH₂)_mC(O)NH(CH₂)_nR₂₀, and -CH₂CR₁₂R_I2C(O)OR₁₃;

(g) R₇ is selected from hydrogen and C] - C₄ alkyl; (h) R₈ is selected from hydrogen and -C(O)Rπ;

(1) R₉ and R₁₀ are each, independently, selected from hydrogen, - C₄ alkyl, and Ci -

C₄ alkanoyl; 0) Y is selected from bond and Cj - C₄ alkyl, (k) R_u is selected from hydroxy, C, - C₄ alkoxy, -NR₁₄R₁₅, Ci - C₄ alkyl, - C₄ alkenyl, and C] - C₄ alkynyl; (1) R₁₂ is C, - C₆ alkyl;

(m) R₁₃ is selected from C] - C₆ alkyl, cycloalkyl, and arylalkyl; (n) R_!4 is selected from hydrogen and C] - C₄ alkyl; (o) Ri₅ is selected from hydrogen, C] - C₄ alkyl, and Cj - C alkanoyl; (p) Rig and R₎₉ are each, independently, selected from hydrogen, - C₆ alkyl, Ci - C₆ alkenyl, hydroxy, and halogen; (q) m is an integer from 2 to 4; (r) n is an integer from 1 to 4; and (s) R₂₀ is an unsaturated, unsubstituted five- or six-membered monocyclic heterocycle containing from one to two nitrogen atoms as the only heteroatoms.

The X Moiety

X is selected from oxygen (-O-), sulfur (-S-), and -CH₂-. Preferably, X is selected from oxygen and -CH₂-. Most preferably X is oxygen.

The Rι and R Moieties

Ri and R₂ are each, independently, selected from hydrogen, halogen, hydroxy, frifluoromethyl, C - C₆ alkyl, C_\ - C₆ alkenyl, and - C₄ alkoxy. Preferably, R, and R₂ are each, independently, selected from hydrogen, halogen, frifluoromethyl, and d - C₆ alkyl. More preferably, R] and R₂ are each, independently, selected from halogen, trifluoromethyl, and Ci - C₆ alkyl. Most preferably, Rj and R₂ are each, independently, selected from halogen and Cj - C₆ alkyl. Preferred halogens are chlorine and iodine.

The R_a Moiety

R₃ is selected from hydrogen, alkyl, aryl, and arylalkyl. Preferably, R₃ is selected from hydrogen, alkyl, and arylalkyl. Preferred alkyls for R₃ are methyl and ethyl. A preferred arylalkyl for R₃ is benzyl.

The . Moietv

R₄ is selected from the group consisting of hydrogen, halogen, C] - C₄ alkyl, - C₄ alkenyl, hydroxy, and Ci - C₄ alkoxy. Preferably, R₄ is selected from hydrogen and halogen (most preferably iodine). Most preferably, _t is hydrogen. The Rs Moiety

R₅ is selected from hydrogen, halogen, hydroxy, alkyl, Ci - C₄ alkenyl, Ci - C alkoxy, cycloalkyl, aryl, and arylalkyl. Preferably, R5 is selected from hydrogen, halogen (particularly iodine), alkyl, cycloalkyl, aryl, and arylalkyl. More preferably, R₅ is selected from hydrogen, alkyl, cycloalkyl, aryl, and arylalkyl. Even more preferably, R₅ is selected from alkyl, cycloalkyl, aryl, and arylalkyl. Most preferably, R₅ is selected from alkyl and arylalkyl (a preferred arylalkyl is benzyl).

The Ris and RIQ Moieties

Ri₈ and R_]9 are each, independently, selected from hydrogen, C] - C₆ alkyl, C< - C₆ alkenyl, hydroxy, and halogen. Preferably, R_]8 and R₁₉ are each, independently, selected from hydrogen and - C₆ alkyl. Most preferably, R₁₈ and R₁₉ are each hydrogen.

The R Moietv

Re is selected from alkyl, aryl, -CH₂CH(NH₂)CO₂H, -CH₂CH(OH)CO₂H, - CH₂CR₇R₈NR₉R_10j -YC(O)R, „ -(CH₂)_n-OH, -CH₂C(R₁₂)(NH₂)CO₂R₁₃,

CH₂CH(COOH)(NH)C(O)(CH₂)_mC(O)NH(CH₂)_nR₂₀, and -CH₂CR₁₂R₁₂C(O)OR₁₃. Preferably, Re is selected from -CH₂CH(NH₂)CO₂H, -CH₂CH(OH)CO₂H, -CH₂CR₇R₈NR₉R₁₀, -YC(O)R_u, - CH₂C(R₁₂)(NH₂)CO₂Rι₃, -CH₂CH(COOH)(NH)C(O)(CH₂)_mC(O)NH(CH₂)_nR₂₀, and CH₂CR₁₂R₁₂C(O)OR₁₃.

R₇ is a substituent on -CH₂CR₇R₈NR₉R₁₀. R₇ is selected from hydrogen and Q - C alkyl.

R₈ is a substituent on -CH₂CR₇R₈NR₉R_]0. R₈ is selected from hydrogen and -C(O)Rπ. Preferably R₈ is hydrogen.

R₉ and Rι₀ are substituents on -CH₂CR₇R₈NR₉R₁₀ and CH₂CR₇R₈NR₉R₁₀. R₉ and R₁₀ are each, independently, selected from hydrogen, C] - C₄ alkyl, and Ci - C₄ alkanoyl (oxo substituted alkyl). Preferably, R₉ and R_]0 are each, independently, selected from hydrogen and Ci - C₄ alkyl.

Y is a substituent on -YC(O)Rπ. Y is selected from a bond and Q - C₄ alkyl. Wherein Y is bond, the C(O)R_π of -YC(O)Rn is directly covalently linked through a single bond to the respective phenyl πng of the compound. Rii is selected from hydroxy, C] - C₄ alkoxy, -NR₁₄Rι₅, - C₄ alkyl, Cj - C₄ alkenyl, and Ci - C₄ alkynyl Preferably, R_n is selected from hydroxy, - C₄ alkoxy, and -NR₁₄R₁₅. Most preferably, R_n is selected from hydroxy and Q - C₄ alkoxy.

R,₂ is a substituent on -CH₂C(R₁₂)(NH₂)CO₂R,₃ and -CH₂CR,₂R₁₂C(O)OR₁₃ R₁₂ is C, - C₆ alkyl.

R,₃ is a substituent on -CH₂CR,₂R₁₂C(O)OR₁₃ and -CH₂C(R₁₂)(NH₂)CO₂R₁₃. R,₃ is selected from Q - C₆ alkyl, cycloalkyl, and arylalkyl. Preferably, R_!3 is Ci - C₆ alkyl.

Ru and R_]5 are each (optionally) substituents on R_u. R₁₄ is selected from hydrogen and - C₄ alkyl, preferably methyl or ethyl. R_I5 is selected from hydrogen, Ci - C₄ alkyl, and Ci - C₄ alkanoyl (oxo (C=O) substituted alkyl). Preferably, R_]5 is selected from hydrogen and Ci - C₄ alkyl.

The integers m and n are of -CH₂CH(COOH)(NH)C(O)(CH₂)_mC(O)NH(CH₂)_nR₂₀. The integer m is from 2 to 4, preferably 2. The integer n is from 1 to 4, preferably 1. R₂₀ is also of - CH₂CH(COOH)(NH)C(O)(CH₂)_mC(O)NH(CH₂)_nR₂₀. R₂₀ is an unsaturated, unsubstituted five- or six-membered monocyclic heterocycle containing from one to two, preferably one, nitrogen atoms as the only heteroatoms. Non-hmitmg examples of preferred heterocycles are pyrrolyl, pyrazolyl, imidazolyl, pyridyl, pyπdazmyl, pyrimidmyl, and pyrazmyl, more preferably imidazolyl, most preferably 5-ιmιdazolyl.

Preferred compounds useful in the method of the present invention are reported in Yokoyama et al.. "Synthesis and Structure - Activity Relationships of Oxamic Acid and Acetic Acid Deπvatives Related to L-Thyronme", Journal of Medicinal Chemistry, Vol. 38, pp. 695 - 707 (1995). These compounds are further descπbed in Table 1 below:

Other preferred compounds useful in the methods of the present invention are those described in Li et al , WO 99/00353, assigned to Karo Bio, published January 7, 1999. Particularly preferred among these compounds have the structure:

wherein R₅ is selected from C] - C₆ alkyl and C₃ - C₇ cycloalkyl; R^ and R₂ are each, independently, selected from hydrogen, halogen, and d - C₆ alkyl, wherein at least one of Ri and R₂ is not hydrogen; and Rn is selected from the group consisting of hydroxy and - C₄ alkoxy. Preferred compounds of this structure are presented below in Table 2:

Table 2

Other preferred compounds used in the methods of the present invention are disclosed in Kun et al.. WO 97/46228, assigned to Octamer, Inc., published December 11, 1997. Particularly preferred among these have the structure:

wherein R₃ is selected from methyl and ethyl; R₄ is selected from hydrogen and iodine; R₅ is selected from hydrogen, iodine, and alkyl, Rι₈ and R₁₉ are each, independently, selected from hydrogen and d - ₆ alkyl; X is selected from oxygen, sulfur, and CH₂; and R] and R₂ are each, independently, selected from hydrogen, halogen, and Ci - C₄ alkyl.

Other preferred compounds useful in the methods of the present invention are those described in Kun et al.. WO 99/20263, assigned to Octamer, Inc., published April 29, 1999.

Other preferred compounds useful in the methods of the present invention are those described in Feinberg et al.. U.S. Patent No. 4,711,855, assigned to Ciba Corning Diagnostics Corp., issued December 8, 1987. Particularly preferred among these compounds have the structure:

wherein m is an integer from 2 to 4; n is an integer from 1 to 4; and R₂₀ is an unsaturated, unsubstituted five- or six-membered monocyclic heterocycle containing from one to two nitrogen atoms as the only heteroatoms. Examples of these heterocycles include, but are not limited to, pyrrolyl, pyrazolyl, imidazolyl, pyridyl, pyπdazmyl, pyrimidmyl, and pyrazmyl, more preferably imidazolyl, most preferably 5-ιmιdazolyl.

Other preferred compounds useful in the methods of the present invention are those descπbed in Wechter et al., U.S. Patent No. 3,449,419, assigned to The Upjohn Co., issued June 10, 1969. Particularly preferred among these compounds have the structure:

wherein R₃ is selected from hydrogen and Ci - C₄ alkyl, R₄ is selected from hydrogen and iodine; R₅ is selected from hydrogen, iodine, and d - C₄ alkyl; R₎₈ and R₁₉ are each, independently, selected from hydrogen and Ci - C₄ alkyl; R] and R₂ are each, independently, halogen; Y is selected from bond and Ci - C₃ alkyl; Rn is -NRι₄R_]5; and R_]4 and R₁₅ are each, independently, selected from hydrogen and Ci - C₄ alkyl

Other preferred compounds useful in the methods of the present invention are those described in Kummer et al.. U.S. Patent No. 3,930,017, issued December 30, 1975. Particularly preferred among these compounds have the structure:

wherein R, is selected from hydrogen and iodine; R, and R₂ are each, independently, selected from hydrogen and iodine; each R_[2 is, independently, Ci - C₆ alkyl; and Rn is selected from Ci - C₆ alkyl, cycloalkyl, and arylalkyl.

Other preferred compounds useful in the methods of the present invention are those descπbed in Ellis et al.. U.S. Patent No 4,766,121, assigned to Smith Kline & French Laboratories Ltd., issued August 23, 1988. Particularly preferred among these compounds have the structure:

wherein X is selected from oxygen, sulfur, and CH₂; Ri and R₂ are each, independently, selected from hydrogen, halogen, and Ci - C₄ alkyl; Re is selected from -CH₂CR₇R₈NR₉R,₀ and - YC(O)R_n; Ri₆ is aryl; and R_!7 is selected from hydrogen and Ci - C₄ alkyl. Preferably, X is oxygen; R_]7 is hydrogen; R, is -CH₂CR₇R₈NR9R₁₀; R₈ is -C(O)R_H; R_u is hydroxy; and / or R₉ is Ci - C₄ alkyl and Rι₀ is hydrogen. Also preferably, R₆ is -YC(O)Rn; Y is Ci - C₄ alkyl; and / or R] and R₂ are each, independently, halogen. Particularly preferred groups for Rι₆ are selected from 4-hydroxyphenyl, 5-hydroxy-2 -pyridyl, 6-oxo-3(lH)pyrιdyl, and 6-oxo-3(lH)pyrιdazmyl.

Other preferred compounds useful m the methods of the present invention are those descπbed in Leeson et al.. "Selective Thyromimetics. Cardiac-Sparing Thyroid Hormone Analogues Containing 3'-Arylmethyl Subsituents", Journal of Medicinal Chemistry, Vol. 32, pp. 320 - 336 (1989). Particularly preferred among these compounds are those shown m Table 3 below:

Table 3

16

Analytical Methods The present invention relates to methods of treating hair loss by administering a compound having a structure as described herein. Preferably, the compound utilized m the present invention will be cardiac-sparing. Compounds (test compounds) may be tested for their ability to induce anagen and their lack of cardiotoxicity (cardiac-sparmg) using the following methods. Alternatively, other methods well-known in the art may be used (but with the term "cardiac-sparmg" being defined according to the method disclosed herein below). Cardiotoxicity Assay:

The cardiotoxicity assay measures the potential of a test compound to adversely affect the cardiovascular system As thyroid hormone (T3) damages the cardiovascular system, the heart enlarges. See, e.g , Gomberg-Maitland et al , "Thyroid hormone and Cardiovascular Disease", American Heart Journal, Vol 135(2), pp. 187-196 (1998), Klem and Oiamaa. "Thyroid Hormone and the Cardiovascular System", Current Opinion in Endocrinology and Diabetes, Vol. 4, pp.341-346 (1997); and Klemperer et al., "Thyroid Hormone Therapy and Cardiovascular Disease", Progress in Cardiovascular Diseases, Vol. 37 (4), pp. 329-336 (1996). This increases the weight of the heart relative to whole body weight. The cardiotoxicity assay herein below is used to test compounds for potentially adverse cardiac effects by measuring their effect on the heart-to-body weight ratio

Two groups each of six male Sprague Dawley rats (Harlan Sprague Dawley, Inc., Indianapolis, IN) (each weighing from approximately 220 grams to 235 grams) are utilized. The first group is a vehicle control group and the second group is a test compound group. The length of the assay is 30 days, with treatment of vehicle or test compound in vehicle daily for 28 of those days as described below.

Prior to initiation of the assay, each rat is allowed to acclimate to standard environmental conditions for 5 days. Each rat receives food (standard rat chow diet) and water ad libitum 5 days pπor to initiation of the assay as well as to termination of the study.

The vehicle is 91:9 (v:v) propylene glycohethanol. The test compound is prepared at a concentration of 500 μg/mL in the vehicle.

Each rat is weighed on day 1 of the assay. Dosage calculations are then performed: each rat will be administered daily a dosing solution of vehicle or test compound m vehicle (depending on whether the rat is in the vehicle control group or the test compound group, respectively) at 500 μL of dosing solution per kg of rat. For rats in the test compound group, this corresponds to a dose of 250 μg of test compound per kg of rat.

Day 2 is the first day of treatment with dosmg solution for both groups. Body weights are taken for each rat on days 3, 5, 8, 10, 12, 15, 17, 19, 22, 24, 26, and 29 prior to dosing for that day; for each rat, the dosmg solutions are recalculated and administered accordingly upon change in body weight.

Treatment occurs once daily in the morning on days 2 through 29, inclusive, for each rat in each group. For each treatment, the dosmg solution is administered subcutaneously between the shoulders of the rat such that the injection sites are rotated in this area. On day 30 in the morning, the rats of each group are euthanized with CO₂ from dry ice Each rat is immediately weighed for total body weight.

The hearts of each rat are then excised as follows. An incision is made to expose the abdominal cavity The rib cage is carefully cut at the sternum with small scissors, such that the heart and lungs are exposed. With small scissors and forceps, the vessels connected to the heart are cut away from the heart. These vessels include the caudal vena cava, left cranial vena cava (pulmonary trunk), right cranial vena cava, thoracic aorta, right subclavian artery, internal thoracic artery and vein, and any other small attachments. The heart is then immediately taken out intact, including the left and right auricles and left and πght ventricles. Immediately thereafter, any excess tissue is trimmed away, the heart is lightly blotted on a paper towel until no more blood is visibly left behind on the paper towel, and the heart is weighed.

The heart weight is divided by the body weight after euthanization for each rat to give the heart/body ratio. The heart/body ratios for each rat m the vehicle control group are added together and divided by 6 (i.e., the total number of rats m the group) to give RV (ratio for vehicle control group). Similarly, the heart/body ratios for each rat m the test compound group are added together and divided by 6 to give RT (ratio for test compound group).

The index C is then calculated by dividing RT by RV. As defined herein, where C is less than 1.3, the test compound is cardiac-sparmg. Preferably, C is less than 1.2, more preferably less than 1.15, and most preferably less than 1.1. In accordance with this method, T3 and T4 are not cardiac-spaπng.

Telogen Conversion Assay:

The Telogen Conversion Assay measures the potential of a test compound to convert mice in the resting stage of the hair growth cycle ("telogen"), to the growth stage of the hair growth cycle ("anagen").

Without intending to be limited by theory, there are three pπncipal phases of the hair growth cycle: anagen, catagen, and telogen. It is believed that there is a longer telogen peπod m C3H mice (Harlan Sprague Dawley, Inc., Indianapolis, IN) from approximately 40 days of age until about 75 days of age, when hair growth is synchronized. It is believed that after 75 days of age, hair growth is no longer synchronized. Wherein about 40 day-old mice with dark fur (brown or black) are used in hair growth expeπments, melanogenesis occurs along with hair (fur) growth wherein the topical application of hair growth mducers are evaluated. The Telogen Conversion Assay herein below is used to screen compounds for potential hair growth by measuring melanogenesis. Three groups of 44 day-old C3H mice are utilized- a vehicle control group, a positive control group, and a test compound group, wherein the test compound group is administered a compound used in the method of the present invention. The length of the assay is at least 19 days with 15 treatment days (wherein the treatment days occur Mondays through Fridays). Day 1 is the first day of treatment. Most studies will end on Day 19, but a few may be carried out to Day 24 if the melanogenesis response looks positive, but occurs slowly A typical study design is shown in Table 4 below. Typical dosage concentrations are set forth in Table 4, however the skilled artisan will readily understand that such concentrations may be modified.

Table 4

**The vehicle is 60% ethanol, 20% propylene glycol, and 20% dimethyl isosorbide (commercially available from Sigma Chemical Co., St. Louis, MO).

The mice are treated topically Monday through Friday on their lower back (base of tail to the lower rib). A pipettor and tip are used to deliver 400 μL to each mouse's back. The 400 μL application is applied slowly while moving hair on the mouse to allow the application to reach the skin.

While each treatment is being applied to the mouse topically, a visual grade of from 0 to 4 will be given to the skm color in the application area of each animal. As a mouse converts from telogen to anagen, its skm color will become more bluish-black. As indicated in Table 5, the grades 0 to 4 represent the following visual observations as the skm progresses from white to bluish-black.

Table 5

Method of Making

The compounds used in the methods of the present invention are prepared according to procedures which are well-known to those ordinarily skilled in the art The starting materials used in preparing the compounds are known, made by known methods, or are commercially available as a starting material.

It is recognized that the ordinarily skilled artisan in the art of organic chemistry can readily carry out standard manipulations of organic compounds without further direction Examples of such manipulations are discussed standard texts such as J March, Advanced Organic Chemistry. John Wiley & Sons (1992).

The ordinarily skilled artisan will readily appreciate that certain reactions are best carried out when other functionalities are masked or protected m the compound, thus increasing the yield of the reaction and / or avoiding any undesirable side reactions Often, the artisan utilizes protecting groups to accomplish such increased yields or to avoid the undesired reactions. These reactions are found in the literature and are also well within the scope of the skilled artisan. Examples of many such manipulations can be found in, for example, T. Greene, Protecting Groups m Organic Synthesis. John Wiley & Sons (1981).

The compounds of the present invention may have one or more chiral centers. As a result, one may selectively prepare one optical isomer, including diastereomers and enantiomers, over another, for example by chiral starting mateπals, catalysts or solvents, or may prepare both stereoisomers or both optical isomers, including diastereomers and enantiomers at once (a racemic mixture). Since the compounds of the invention may exist as racemic mixtures, mixtures of optical isomers, including diastereomers and enantiomers, may be separated using known methods, such as through the use of, for example, chiral salts and chiral chromatography.

In addition, it is recognized that one optical isomer, including a diastereomer and enantiomer, or a stereoisomer, may have favorable properties over the other. Thus, when disclosing and claiming the invention, when one racemic mixture is disclosed, it is clearly contemplated that both optical isomers, including diastereomers and enantiomers, or stereoisomers substantially free of the other are disclosed and claimed as well.

The syntheses of the compounds useful in the present invention are descπbed in the art. Accordingly, the ordinarily skilled artisan will be able to prepare the compounds described herein. For further guidance, the syntheses of vaπous of the present compounds are descπbed m, for example, Ellis et al., U.S. Patent No. 4,910,305, assigned to Smith Kline & French Laboratories, issued March 20, 1990, Ellis et al., U S. Patent No 4,826,876, assigned to Smith Klme & French Laboratories, issued May 2, 1989; Ellis et al., U.S Patent No 4,766,121 assigned to Smith Klme & French Laboratories, issued August 23, 1988; Emmett et al., U.S Patent No. 5,061,798, assigned to Smith Klme & French Laboratories, issued October 29, 1991; Blank et al., U.S. Patent No. 3,149,153, assigned to Smith Klme & French Laboratories, issued September 15, 1964; Blank et al„ U.S. Patent No. 3,287.396, assigned to Smith Klme & French Laboratories, issued November 22, 1966, Lee son et al., EP 0,188,351, assigned to Smith Klme & French Laboratories, published July 23, 1986; Stearns. WO 90/07330, assigned to The Regents of the University of California, published July 12, 1990; Yu et al.. U.S. Patent No. 4,363,815, issued December 14, 1982; Kummer et al.. U.S. Patent No. 3,930,017, issued December 30, 1975; Kummer et al., U.S Patent No 4,110,470, issued August 29, 1978; Wechter et al.. U.S. Patent No. 3,449,419. assigned to The Upjohn Company, issued June 10, 1969; Feinberg, U.S. Patent No. 4,711,855, assigned to Ciba Corning Diagnostics Corp., issued December 8, 1987; Kun et al., WO 97/46228, assigned to Octamer, Inc., published December 11, 1997; Li et al.. WO 99/00353, assigned to Karo Bio, published January 7, 1999; and Leeson et al., "Selective Thyromimetics. Cardiac-Sparmg Thyroid Hormone Analogues Containing 3'- Arylmethyl Substituents", Journal of Medicinal Chemistry, Vol. 32, pp. 320 - 336 (1989). The following non-hmitmg examples provide even further guidance of making the compounds used in the present method.

Example 1

To a suspension of bιs(3-ιsopropyl-4-methoxyphenyl)ιodonιum tetrafluoroborate (prepared by the method of Yokoyama et al., "Synthesis and Structure - Activity Relationships of Oxamic Acid and Acetic Acid Deπvatives Related to L-Thyromne", Journal of Medicinal Chemistry, Vol. 38, pp. 695 - 707 (1995)), and copper bronze (6.1 g) in dichloromethane (150 mL), is added a solution of methyl 3,5-dιbromo-4-hydroxybenzoate (15 g) and tπethylamme (5.4 g) in dichloromethane (100 mL) dropwise at room temperature. The mixture is stirred overnight and then filtered through cehte. After concentration, the resulting residue is passed through a short silica gel column. The pure fractions are combined and concentrated to dryness. The residue is recrystalhzed from methanol to afford methyl 3,5-dlbromo -4-(4'methoxy-3'- ιsopropylphenoxy)-benzoate.

The above ester (6.5 g) is hydrolyzed by treatment with 1 M aqueous NaOH (60 mL) and methanol (150 mL) to give 3,5-dιbromo -4-(4'-methoxy-3'-ιsopropylphenoxy)benzoιc acid

The benzoic acid (2 g) is demethylated with boron tπbromide (1M, 26 mL) in dichloromethane at 0 °C. The mixmre is stirred overnight at room temperamre before quenching with a water/ice mixmre. The layers are separated and the water layer is extracted with dichloromethane. The combined organic extracts are dried, filtered and concentrated. The resulting residue is recrystallized to give 3,5-dιbromo-4-(4-hydroxy-3-ιsopropylphenoxy)benzoιc acid.

Bromine (35.2 g) is added dropwise to a suspension of methyl 4-hydroxy-phenylacetate (16.6 g) in water (500 mL). After 1 day of stirring, the mixture is partitioned between water and ethyl acetate. The organic layer is washed with aqueous sodium thiosulfate, dried, filtered and concentrated. The residue is recrystallized from methanol to give methyl 3,5-dιbromo-4- hydroxyphenylacetate .

The above phenol (5 g) is coupled to bιs(3-ιsopropyl-4-methoxyphenyl)ιodomum tetrafluoroborate (9.5 g) as described in Example 1. Purification by column chromatography and recrystalhzation from methanol affords methyl 3,5-dιbromo-4-(4-methoxy-3-ιsopropyl- phenoxy)phenylacetate.

The above ester (2.4 g) is demethylated with boron tπbromide. The crude product is recrystallized from dichloromethane and light petroleum ether to give 3,5-dιbromo-4-(4'- hydroxy-3'-ιsopropylphenoxy)phenylacetιc acid.

Methyl 3,5-dιchloro-4-hydroxybenzoate (10 g) is coupled with bιs(3-ιsopropyl-4- methoxyphenyl)ιodonιum tetrafluoroborate (35 g) using the method described in Example 1. Puπfication by column chromatography followed by recrystalhzation from methanol affords methyl 3,5-dιchloro-4-(4-methoxy-3-ιsopropylphenoxy) benzoate.

The above methoxy compound (100 mg) is demethylated and hydrolyzed using the method described m Example 1 to give 3,5-dιchloro-4-(4-hydroxy-3-ιsopropylphenoxy)benzoιc acid.

Methyl 3,5-dιchloro-4-(4-methoxy-3-ιsopropylphenoxy)benzoate (see Example 3) (3.0 g) is treated with a IM solution of dusobutyl aluminium hydride (DIBAL) in tetrahydrofuran (32.5 mL) at 0 °C and then warmed to room temperamre and stirred overnight. The reaction mixmre is poured mto an ice-cold IM HC1 solution and extracted with ethyl acetate three times. The organic layer is washed (bπne), dried, filtered and concentrated to dryness to afford 3,5- dιchloro-4-(4-methoxy-3-ιsopropylphenoxy) benzylalcohol.

The above alcohol (200 mg) is demethylated using the method descπbed in Example 1 to give 3,5 dιchloro-4-(4-hydroxy-3-ιsopropylphenoxy) benzylalcohol.

Methyl 3,5-dnodo-4-(4'-ethoxyphenoxy)benzoate is synthesized using the general methodology of Borrows et al., "The Synthesis of Thyroxme and Related Substances. Part I The Preparation of Tyrosme and Some of its Derivatives, and a New Route to Thyroxme", Journal of the Chemical Society, Supp. Issue No 1, S185 - S190 (1949).

3,5-dnodo-4-(4'-methoxyphenoxy)benzoιc acid is synthesized using the general methodology of Borrows et al., "The Synthesis of Thyroxme and Related Substances. Part I. The Preparation of Tyrosme and Some of its Derivatives, and a New Route to Thyroxme", Journal of the Chemical Society, Supp. Issue No. 1, S185 - S190 (1949).

3, 3', 5-tπιodothyroacetιc acid is commercially available from Sigma Chemical Co., St. Louis, MO.

3, 3', 5-tπιodothyropropιonιc acid is commercially available from Sigma Chemical Co., St. Louis, MO.

Example 9

9a. 2-isopropyl anisole: Potassium hydroxide (5.6 g) is added to 13.4 mL acetone followed by 2-ιsopropylphenol (13.6 g). After the potassium hydroxide is dissolved, methyl iodide (14.2 g) is added. The reaction is refluxed for about 16 hours. 150 mL of water is added. This reaction is extracted 3 times with 100 mL diethyl ether. The organic layer is extracted twice with 100 mL 10% sodium hydroxide in water, once with 100 mL water, and once with 100 mL saturated ammonium chloπde. After drying over magnesium sulfate, the organic solution is dried over MgSO₄, filtered, and concentrated under reduced pressure. The mateπal is fractionally distilled under reduced pressure to afford 9a. 9b. Bis(3-isopropyl-4-methoxyphenyl)iodonium Tetrafluoroborate: Acetic anhydride (7 mL) is cooled to -15 °C in a dry ice/acetone bath Fummg nitric acid (5.4 mL) is added dropwise. Iodine (2.5 g) is added in one piece followed by dropwise addition of 4.7 mL tπfluoroacetic acid. After 20 minutes, the reaction is removed from the bath and stirred at room temperature for 30 minutes. After the iodine has dissolved, the reaction is sparged to remove nitrogen oxides and then concentrated under vacuum. The material is then taken up in 15 mL acetic anhydride and cooled to -10 °C. To this cooled solution is added dropwise a solution of 2- lsopropyl anisole (9a; 7.43 g) in 35 mL acetic anhydride and 5 mL tπfluoroacetic acid The reaction is allowed to stand in a refrigerator for about 16 hours. After allowing the reaction to return to room temperature for 3 hours, the reaction is concentrated under high vacuum. The residue is taken up in 25 mL methanol, 25 mL 10% sodium bisulfite, and 188 mL 2M sodium tetrafluoroborate The mixture is stirred vigorously for 30 minutes and the supernatant is decanted off. To the residue is added 200 mL hexane and it is stirred for an additional 30 minutes. At that time, the solid is collected, washed with hexane, and dπed under vacuum to afford 9b.

9c. 2',6'-diiodo-3-isopropyl-4-methoxy-4'-nitrilediphenyl ether: Bιs(3-ιsopropyl-4- methoxyphenyl)ιodonιum tetrafluoroborate (9b; 1 g) is weighed is taken up in 3 mL dichloromethane and 0.17 g copper bronze is added. The mixture is cooled m an ice water bath. A solution of 2,6-dιιodo-4-nιtπlephenol (0.48 g) and tπethylamme (0.28 g) m 3 mL dichloromethane is added dropwise. The reaction is placed in the dark and stirred for 5 days. At this time, the reaction is filtered through cehte and concentrated under reduced pressure. Puπfication of the product by chromatography on silica gel affords 9c.

9d. 2',6'-diiodo-3-isopropyl-4-methoxy-4'-nitrilediphenyl ether: 2',6'-Dnodo-3-ιsopropyl- 4-methoxy-4'-mtπledιphenyl ether (9c; 280 mg) is dissolved in 4 mL dichloromethane and cooled in a dry ice/acetone bath. To this solution is dropwise added 1.6 mL boron tπbromide (1 M in dichloromethane). The reaction is stirred overnight and allowed to reach room temperature. At this time, the reaction is poured onto 10 mL ice and water. To this mixture is added 10 mL ethyl acetate. The organic layer is separated and the aqueous phase is extracted twice with 10 mL ethyl acetate. The organic layers are combined, washed with saturated sodium chloπde, dried over magnesium sulfate, and concentrated under reduced pressure. Puπfication of the product by chromatography on silica gel affords 9d. 9e. 3,5-diiodo-4-(4'-hydroxy-3'-isopropylphenoxy)benzoic acid: To 2',6'-dnodo-3- ιsopropyl-4-methoxy-4'-nιtπledιphenyl ether (9d, 95 mg) is added 1 mL 3 N sodium hydroxide. The sample is boiled and becomes homogeneous. At this time, the reaction is cooled and neutralized with 1 N HCl. A precipitate forms and is filtered off and washed with hexane to afford 9e.

Use of the Present Compounds

The methods of the present invention are performed by administering to a mammal (preferably a human) a compound having a structure as described herein and, preferably, a pharmaceutically-acceptable or cosmetically-acceptable earner.

The compounds herein may be used for the treatment of such conditions as treating hair loss m mammals, including arresting and / or reversing hair loss and promoting hair growth. Such conditions may manifest themselves in, for example, alopecia, including male pattern baldness and female pattern baldness.

Preferably the compounds of the present invention are, as defined herein, cardiac- spaπng.

Preferably, in the methods of the present invention, the compounds are formulated mto pharmaceutical or cosmetic compositions for use in treatment or prophylaxis of conditions such as the foregoing. Standard pharmaceutical formulation techniques are used, such as those disclosed in Remington's Pharmaceutical Sciences. Mack Publishing Company, Easton, PA. (1990).

Typically, from about 5 mg to about 3000 mg, more preferably from about 5 mg to about 1000 mg, more preferably from about 10 mg to about 100 mg, of a compound having a structure as described herein is administered per day for systemic administration. It is understood that these dosage ranges are by way of example only, and that daily administration can be adjusted depending on various factors. The specific dosage of the compound to be administered, as well as the duration of treatment, and whether the treatment is topical or systemic are interdependent. The dosage and treatment regimen will also depend upon such factors as the specific compound used, the treatment indication, the efficacy of the compound, the personal attributes of the subject (such as, for example, weight, age, sex, and medical condition of the subject), compliance with the treatment regimen, and the presence and severity of any side effects of the treatment. According to the present invention, the subject compounds are co-admmistered with a pharmaceutically-acceptable or cosmetically-acceptable carrier (herein collectively described as "carrier"). The term "carrier", as used herein, means one or more compatible solid or liquid filler diluents or encapsulating substances which are suitable for administration to a mammal. The term "compatible", as used herein, means that the components of the composition are capable of being commingled with a compound of the present invention, and with each other, in a manner such that there is no interaction which would substantially reduce the efficacy of the composition under ordinary use situations. Carπers must, of course, be of sufficiently high purity and sufficiently low toxicity to render them suitable for administration to the animal, preferably mammal (most preferably human), being treated. The carrier can itself be inert or it can possess pharmaceutical and / or cosmetic benefits of its own.

The compositions of this invention may be in any of a variety of forms, suitable (for example) for oral, rectal, topical, nasal, ocular or parenteral administration. Of these, topical and / or oral administration are especially prefeπed with topical being most preferred. Depending upon the particular route of administration desired, a variety of carriers well-known m the art may be used These include solid or liquid fillers, diluents, hydrotropes, surface-active agents, and encapsulating substances. Optional pharmaceutically-active or cosmetically-active materials may be included which do not substantially interfere with the activity of the compound of the present invention. The amount of carrier employed in conjunction with the compound is sufficient to provide a practical quantity of material for administration per unit dose of the compound. Techniques and compositions for making dosage forms useful in the methods of this invention are described m the following references: Modern Pharmaceutics, Chapters 9 and 10, Banker & Rhodes, eds. (1979); Lieberman et al., Pharmaceutical Dosage Forms. Tablets (1981); and Ansel, Introduction to Pharmaceutical Dosage Forms. 2^nd Ed., (1976).

Some examples of substances which can serve as carπers or components thereof are sugars, such as lactose, glucose and sucrose; starches, such as corn starch and potato starch; cellulose and its deπvatives, such as sodium carboxymethyl cellulose, ethyl cellulose, and methyl cellulose; powdered tragacanth; malt; gelatin; talc; solid lubπcants, such as steaπc acid and magnesium stearate; calcium sulfate; vegetable oils, such as peanut oil, cottonseed oil, sesame oil, olive oil, corn oil and oil of theobroma; polyols such as propylene glycol, glyceπne, sorbitol, mannitol, and polyethylene glycol; algmic acid; emulsifiers, such as the TWEENS; wetting agents, such sodium lauryl sulfate; coloπng agents; flavoπng agents; tabletmg agents, stabilizers; antioxidants; preservatives, pyrogen-free water; isotonic salme; and phosphate buffer solutions.

The choice of a carrier to be used m conjunction with the subject compound is typically determined by the way the compound is to be administered

In particular, carπers for systemic administration include sugars, starches, cellulose and its derivatives, malt, gelatin, talc, calcium sulfate, vegetable oils, synthetic oils, polyols, algmic acid, phosphate buffer solutions, emulsifiers, isotonic salme, and pyrogen- free water. Preferred earners for parenteral administration include propylene glycol, ethyl oleate, pyrrolidone, ethanol, and sesame oil. Preferably, the caπier, in compositions for parenteral administration, comprises at least about 90% by weight of the total composition

Various oral dosage forms can be used, including such solid forms as tablets, capsules, granules and bulk powders. These oral forms comprise a safe and effective amount, usually at least about 5%, and preferably from about 25% to about 50%, of a compound used in the present invention. Tablets can be compressed, tablet triturates, enteric-coated, sugar-coated, film-coated, or multiple-compressed, containing suitable binders, lubricants, diluents, disintegrating agents, coloring agents, flavoring agents, flow- inducing agents, and melting agents. Liquid oral dosage forms include aqueous solutions, emulsions, suspensions, solutions and/or suspensions reconstituted from non-effervescent granules, and effervescent preparations reconstituted from effervescent granules, containing suitable solvents, preservatives, emulsifying agents, suspending agents, diluents, sweeteners, melting agents, coloring agents and flavoring agents.

The carπers suitable for the preparation of unit dosage forms for oral administration are well-known in the art. Tablets typically compπse conventional pharmaceutically-compatible adjuvants as inert diluents, such as calcium carbonate, sodium carbonate, mannitol, lactose and cellulose; binders such as starch, gelatin and sucrose; dismtegrants such as starch, algmic acid and croscarmelose; lubricants such as magnesium stearate, steaπc acid and talc. Ghdants such as silicon dioxide can be used to improve flow characteπstics of the powder mixture. Coloπng agents, such as the FD&C dyes, can be added for appearance. Sweeteners and flavoπng agents, such as aspartame, sacchaπn, menthol, peppermint, and fruit flavors, are useful adjuvants for chewable tablets. Capsules (including time release and sustained release formulations) typically compπse one or more solid diluents disclosed above. The selection of earner components depends on secondary considerations like taste, cost, and shelf stability, which are not critical for the purposes of the subject invention, and can be readily made by a person skilled m the art. Orally administered compositions also include liquid solutions, emulsions, suspensions, powders, granules, elixirs, tinctures, syrups, and the like. The carπers suitable for preparation of such compositions are well known m the art Typical components of carriers for syrups, elixirs, emulsions and suspensions include ethanol, glycerol, propylene glycol, polyethylene glycol, liquid sucrose, sorbitol and water For a suspension, typical suspending agents include methyl cellulose, sodium carboxymethyl cellulose, AVICEL RC-591, tragacanth and sodium algmate; typical wetting agents include lecithin and polysorbate 80; and typical preservatives include methyl paraben and sodium benzoate. Peroral liquid compositions may also contain one or more components such as sweeteners, flavoπng agents and colorants disclosed above.

Such compositions may also be coated by conventional methods, typically with pH or time-dependent coatings, such that the subject compound is released in the gastrointestinal tract in the vicinity of the desired topical application, or at various times to extend the desired action Such dosage forms typically include, but are not limited to, one or more of cellulose acetate phthalate, polyvmylacetate phthalate, hydroxypropyl methyl cellulose phthalate, ethyl cellulose, Eudragit coatings, waxes and shellac.

Other compositions useful for attaining systemic delivery of the subject compounds include subhngual, buccal and nasal dosage forms. Such compositions typically compnse one or more of soluble filler substances such as sucrose, sorbitol and mannitol; and binders such as acacia, microcrystallme cellulose, carboxymethyl cellulose and hydroxypropyl methyl cellulose. Ghdants, lubricants, sweeteners, colorants, antioxidants and flavonng agents disclosed above may also be included.

The compounds of the present invention may also be topically administered The carrier of the topical composition preferably aids penetration of the present compounds mto the skm to reach the environment of the hair follicle. Topical compositions of the present invention may be in any form including, for example, solutions, oils, creams, ointments, gels, lotions, shampoos, leave-on and πnse-out hair conditioners, milks, cleansers, moistunzers, sprays, skm patches, and the like.

Topical compositions containing the active compound can be admixed with a vaπety of earner materials well known m the art, such as, for example, water, alcohols, aloe vera gel, allantom, glyceπne, vitamin A and E oils, mineral oil, propylene glycol, PPG-2 myπstyl propionate, and the like.

Other mateπals suitable for use m topical carriers include, for example, emollients, solvents, humectants, thickeners and powders. Examples of each of these types of materials, which can be used singly or as mixtures of one or more materials, are as follows: Emollients, such as stearyl alcohol, glyceryl mononcmoleate, glyceryl monostearate, propane- 1,2-dιol, butane-l,3-dιol, mink oil, cetyl alcohol, z_O-propyl isostearate, steaπc acid, iso- butyl palmitate, lsocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecan-2-ol, lsocetyl alcohol, cetyl palmitate, dimethylpolysiloxane, di-M-butyl sebacate, iso- propyl myπstate, zso-propyl palmitate, zsø-propyl stearate, butyl stearate, polyethylene glycol, tπethylene glycol, lanolin, sesame oil, coconut oil, arachis oil, castor oil, acetylated lanolin alcohols, petroleum, mineral oil, butyl myπstate, lsosteaπc acid, palmitic acid, isopropyl lmoleate, lauryl lactate, myπstyl lactate, decyl oleate, and myπstyl mynstate; propellants, such as propane, butane, zsø-butane, dimethyl ether, carbon dioxide, and nitrous oxide; solvents, such as ethyl alcohol, methylene chloride, zso-propanol, castor oil, ethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoethyl ether, dimethyl sulphoxide, dimethyl formamide, tetrahydrofuran, humectants, such as glycerin, sorbitol, sodium 2- pyrrohdone-5-carboxylate, soluble collagen, dibutyl phthalate, and gelatin; and powders, such as chalk, talc, fullers earth, kaolm, starch, gums, colloidal silicon dioxide, sodium polyacrylate, terra alkyl ammonium smectites, tπalkyl aryl ammonium smectites, chemically modified magnesium aluminium silicate, organically modified montmoπllonite clay, hydrated aluminium silicate, fumed silica, carboxyvmyl polymer, sodium carboxymethyl cellulose, and ethylene glycol monostearate.

The compounds used in the present invention may also be administered in the form of hposome delivery systems, such as small umlamellar vesicles, large umlamellar vesicles, and multilamellar vesicles. Liposomes can be formed from a variety of phosphohpids, such as cholesterol, stearylarmne or phosphatidylchohnes A preferred formulation for topical delivery of the present compounds utilizes liposomes such as described in Dowton et al., "Influence of Liposomal Composition on Topical Delivery of Encapsulated Cyclosporm A: I. An in vitro Study Using Hairless Mouse Skm", S TP Pharma Sciences, Vol. 3, pp. 404 - 407 (1993); Wallach and Phihppot. "New Type of Lipid Vesicle: Novasome^®", Liposome Technology. Vol. 1, pp. 141 - 156 (1993); Wallach. U.S. Patent No. 4,911,928, assigned to Micro-Pak, Inc., issued March 27, 1990; and Werner et al.. U.S. Patent No 5,834,014, assigned to The University of Michigan and Micro-Pak, Inc., issued November 10, 1998 (with respect to Werner et al.. with a compound as descπbed herein administered in lieu of, or in addition to, mmoxidil).

The compounds of the present invention may also be administered by iontophoresis See, e.g.. internet site www.unipr.it/arpa/dipfarrn/erasmus/erasml4.html; Banga et al., "Hydrogel-based Iontotherapeutic Delivery Devices for Transdermal Delivery of Peptide/Protem Drugs", Pharm Res , Vol. 10 (5), pp. 697-702 (1993), Ferry. "Theoretical Model of Iontophoresis Utilized in Transdermal Drug Delivery", Pharmaceutical Ada Helvetiae, Vol 70, pp. 279-287 (1995); Gangarosa et al„ "Modern Iontophoresis for Local Drug Delivery", Int. J. Pharm, Vol. 123, pp. 159-171 (1995); Green et al., "lontophoretic Delivery of a Series of Tripeptides Across the Skin in vitro", Pharm. Res., Vol 8, pp. 1121-1127 (1991); Jadoul et al., "Quantification and Localization of Fentanyl and TRH Delivered by Iontophoresis in the Skin", Int. J. Pharm., Vol. 120, pp. 221-8 (1995); O'Brien et al.. "An Updated Review of its Antiviral Activity, Pharmacokinetic Properties and Therapeutic Efficacy", Drugs, Vol. 37, pp. 233-309 (1989); Parry et al.. "Acyclovir Biovailability in Human Skin", J. Invest. Dermatol, Vol. 98 (6), pp. 856-63 (1992); Santi et al., "Drug Reservoir Composition and Transport of Salmon Calcitonin in Transdermal Iontophoresis", Pharm. Res., Vol 14 (1), pp. 63-66 (1997); Santi et al., "Reverse Iontophoresis - Parameters Determining Electroosmotic Flow: I. pH and Ionic Strength", J. Control. Release, Vol. 38, pp. 159-165 (1996); Santi et al., "Reverse Iontophoresis - Parameters Determining Electroosmotic Flow: π. Electrode Chamber Formulation", J. Control. Release, Vol. 42, pp. 29-36 (1996); Rao et al.. "Reverse Iontophoresis: Noninvasive Glucose Monitoring in vivo in Humans", Pharm. Res., Vol. 12 (12), pp. 1869-1873 (1995); Thysman et al., "Human Calcitonin Delivery in Rats by Iontophoresis", J. Pharm. Pharmacol, Vol. 46, pp. 725-730 (1994); and Volpato et al.. "Iontophoresis Enhances the Transport of Acyclovir through Nude Mouse Skin by Electrorepulsion and Electroosmosis", Pharm. Res., Vol. 12 (11), pp. 1623-1627 (1995).

The compositions used in the present invention may also optionally comprise an activity enhancer. The activity enhancer can be chosen from a wide variety of molecules which can function in different ways to enhance hair growth effects of a compound of the present invention. Particular classes of activity enhancers include other hair growth stimulants and penetration enhancers.

Non-limiting examples of other hair growth stimulants which may be used in the compositions herein, including both systemic and topical compositions, include, for example, benzalkonium chloride, benzethonium chloride, phenol, estradiol, diphenhydramine hydrochloride, chlorpheniramine maleate, chlorophyllin derivatives, cholesterol, salicylic acid, cysteine, methionine, red pepper tincture, benzyl nicotinate, D,L - menthol, peppermint oil, calcium pantothenate, panthenol, castor oil, hinokitiol, prednisolone, resorcinol, monosaccharides and esterified monosaccharides, chemical activators of protein kinase C enzymes, glycosaminoglycan chain cellular uptake inhibitors, inhibitors of glycosidase activity, glycosaminoglycanase inhibitors, esters of pyroglutamic acid, hexosaccharic acids or acylated hexosaccharic acids, aryl-substituted ethylenes, N-acylated amino acids, and, of course, mmoxidil or fmasteπde The most preferred activity enhancers are m oxidil and finasteπde, most preferably mmoxidil.

Non-hmitmg examples of penetration enhancers which may be used m the compositions herein include, for example, 2-methyl propan-2-ol, propan-2-ol, ethyl-2-hydroxypropanoate, hexan-2,5-dιol, POE(2) ethyl ether, dι(2-hydroxypropyl) ether, pentan-2,4-dιol, acetone, POE(2) methyl ether, 2-hydroxypropiomc acid, 2-hydroxyoctanoιc acid, propan-1-ol, 1,4-dιoxane, tetrahydrofuran, butan-l,4-dιol, propylene glycol dipelargonate, polyoxypropylene 15 stearyl ether, octyl alcohol, POE ester of oleyl alcohol, oleyl alcohol, lauryl alcohol, dioctyl adipate, dicapryl adipate, di-isopropyl adipate, di-isopropyl sebacate, dibutyl sebacate, diethyl sebacate, dimethyl sebacate, dioctyl sebacate, dibutyl suberate, dioctyl azelate, dibenzyl sebacate, dibutyl phthalate, dibutyl azelate, ethyl myπstate, dimethyl azelate, butyl myπstate, dibutyl succmate, didecyl phthalate, decyl oleate, ethyl caproate, ethyl sahcylate, zso-propyl palmitate, ethyl laurate, 2-ethyl-hexyl pelargonate, zso-propyl isostearate, butyl laurate, benzyl benzoate, butyl benzoate, hexyl laurate, ethyl caprate, ethyl caprylate, butyl stearate, benzyl sahcylate, 2- hydroxypropanoic acid, 2-hyroxyoctanoιc acid, dimethyl sulphoxide, N,N-dιmethyl acetamide, N,N-dιmethyl formamide, 2-pyrrohdone, l-methyl-2-pyrrohdone, 5-methyl-2-pyrrohdone, 1,5- dιmethyl-2-pyrrohdone, l-ethyl-2 -pyrrolidone, phosph e oxides, sugar esters, tetrahydrofurfural alcohol, urea, diethyl-w-toluamide, and, l-dodecylazacyloheptan-2-one.

In all of the foregoing, of course, the compounds used in the present methods can be administered alone or as mixtures, and the compositions may further include additional drugs or excipients as appropriate for the indication.

The present invention further relates to kits compπsmg a compound and / or composition herein and information and / or instructions by words, pictures, and / or the like, that use of the kit will provide treatment for hair loss in mammals (particularly humans) including, for example, arresting and / or reversing hair loss and / or promoting hair growth. In addition or m the alternative, the kit may compnse a compound and / or composition herein and information and / or instructions regarding methods of application of the compound and / or composition, preferably with the benefit of treating hair loss in mammals.

Examples of Composition Administration The following examples do not limit the invention, but provide guidance to the skilled artisan to perform the methods of the present invention. In each example, a compound other than the one mentioned may be substituted m the example by another having a structure as described herein with similar results. Example A A composition for topical administration is made, comprising:

A human male subject suffeπng from male pattern baldness is treated by a method of this invention. Specifically, for 6 weeks, the above composition is daily administered topically to the subject.

Example B

A composition for topical administration is made according to the method of Dowton et al., "Influence of Liposomal Composition on Topical Delivery of Encapsulated Cyclosponn A: I. An in vitro Study Using Hairless Mouse Sk ", S.T.P. Pharma Sciences, Vol. 3, pp. 404 - 407 (1993), using the compound of Example 2 in lieu of cyclospoπn A and using the Novasome 1 for the non-ionic liposomal formulation.

A human male subject suffering from male pattern baldness is treated each day with the above composition. Specifically, for 6 weeks, the above composition is administered topically to the subject.

Example C

A shampoo is made, compπsmg:

A human subject suffering from male pattern baldness is treated by a method of this invention. Specifically, for 12 weeks, the above shampoo is used daily by the subject.

Claims

What is claimed is:

1. A method of treating hair loss comprising administering to a mammal a composition comprising a cardiac-sparing compound characterized by the structure:

X is selected from the group consisting of oxygen, sulfur, and CH₂;

Ri and R₂ are each, independently, selected from the group consisting of hydrogen, halogen, hydroxy, trifluoromethyl, Ci - Cβ alkyl, Ci - C₆ alkenyl, and Ci - C alkoxy;

R₃ is selected from the group consisting of hydrogen, alkyl, aryl, and arylalkyl;

R is selected from the group consisting of hydrogen, halogen, Ci - C₄ alkyl, Ci - C₄ alkenyl, hydroxy, and Ci - C₄ alkoxy;

R₅ is selected from the group consisting of hydrogen, halogen, hydroxy, alkyl, Ci - C alkenyl, Ci - C₄ alkoxy, cycloalkyl, aryl, and arylalkyl;

Re is selected from the group consisting of alkyl, aryl, -CH₂CH(NH₂)Cθ₂H, -CH₂CH(OH)C0₂H, -CH₂CR₇R8NR₉Rιo, -YC(0)R_{11 f} -(CH₂)_n-OH, - CH₂C(Rι₂)(NH₂)C0₂Ri₃, -CH₂CH(COOHKNH)C(0)(CH₂)_mC(0)NH(CH₂)nR₂o, and

R is selected from the group consisting of hydrogen and Ci - C₄ alkyl;

Rs is selected from the group consisting of hydrogen and -C(0)Rn;

Rg and R₁₀ are each, independently, selected from the group consisting of hydrogen, Ci - C alkyl, and Ci - C alkanoyl; Y is selected from the group consisting of a bond and Ci - C₄ alkyl;

R₁₁ is selected from the group consisting of hydroxy, Ci - C₄ alkoxy, - NRι R ₅, Ci - C₄ alkyl, Ci - C alkenyl, and Ci - C₄ alkynyl;

R12 is Ci - C₆ alkyl;

R₁₃ is selected from the group consisting of Ci - C₆ alkyl, cycloalkyl, and arylalkyl;

Ru is selected from the group consisting of hydrogen and Ci - C alkyl;

R₁₅ is selected from the group consisting of hydrogen, Ci - C alkyl, and Ci - C alkanoyl;

R₁₈ and R₁₉ are each, independently, selected from the group consisting of hydrogen, Ci - C₆ alkyl, Ci - C₆ alkenyl, hydroxy, and halogen; m is an integer from 2 to 4; n is an integer from 1 to 4; and

R20 is an unsaturated, unsubstituted five- or six-membered monocyclic heterocycle containing from one to two nitrogen atoms as the only heteroatoms.

2. A method according to Claim 1 wherein the compound is characterized by the structure:

wherein:

Ri and R₂ are each, independently, selected from the group consisting of hydrogen, halogen, and Ci - C₄ alkyl;

Re is selected from the group consisting of -CH₂CR₇R₈NRgRιo and - YC(0)Rιι;

R16 is aryl; and Rι is selected from the group consisting of hydrogen and Ci - C alkyl.

3. A method according to any of the preceding claims wherein R₆ is - YC(0)Rn.

4. A method according to any of the preceding claims wherein Ri and R₂ are each, independently, halogen.

5. A method according to Claim 1 wherein the compound is characterized by the structure:

wherein Ri and R₂ are each, independently, selected from the group consisting of hydrogen and iodine.

6. A method according to claim 1 wherein the compound is characterized by the structure:

7. A method according to claim 6 wherein m is 3 and n is 2.

8. A method according to claim 1 wherein the compound is characterized by the structure:

wherein:

R₅ is selected from the group consisting of Ci - C₆ alkyl and C₃ - C cycloalkyl;

Ri and R₂ are each, independently, selected from the group consisting of hydrogen, halogen, and Ci - C₆ alkyl, with the proviso that at least one of Ri and R₂ is not hydrogen; and

Rn is selected from the group consisting of hydroxy and Ci - C₄ alkoxy.

9. A method according to any of the preceding claims wherein the administration is topical.