AU4172900A

AU4172900A - Weight loss after pregnancy

Info

Publication number: AU4172900A
Application number: AU41729/00A
Authority: AU
Inventors: Carl M. Mendel; Timothy B. Seaton; Steve P. Weinstein
Original assignee: Knoll Pharmaceutical Co
Current assignee: Abbott GmbH and Co KG
Priority date: 1999-03-19
Filing date: 2000-03-17
Publication date: 2000-10-09
Also published as: CZ20013282A3; WO2000056317A1; ZA200107680B; JP2002539253A; PL351080A1; CN1352553A; BG105995A; EP1162966A1; NO20014474L; SK13362001A3; HUP0200500A2; NZ514015A; EP1162966A4; BR0009078A; NO20014474D0; MXPA01009465A; CA2367268A1; KR20010113848A; TR200102694T2; IL145243A0

Description

WO 00/56317 PCT/USOO/07202 Weight Loss after Pregnancy This invention relates to a method of aiding weight loss after pregnancy. 5 According to the present invention there is provided a method of aiding in weight loss after pregnancy, in which a therapeutically effective amount of a compound of formula I

CH

3

H

3

CCHCH

2

CHNRR

2 10 including enantiomers and pharmaceutically acceptable salts thereof, in which R, and R 2 are independently H or methyl, is administered in conjunction with a pharmaceutically acceptable diluent or carrier to a human in need thereof. 15 A preferred compound of formula I is N,dimethyl-1-[1-(4 chlorophenyl)cyclobutyl]-3-methylbutylamine or a salt thereof, for example the hydrochloride salt. A preferred form of this hydrochloride is its monohydrate. 20 The preparation and use of compounds of formula 1, such as N,N dimethyl-1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine, N-{1-[1-(4 chlorophenyl)-cyclobutyl]-3-methylbutyl}-N-methylamine, and 1-[1-(4 chlorophenyl)-cyclobutyl]-3-methylbutylamine and salts thereof, in the treatment of depression is described in British Patent Specification 2098602 and US Patent 25 4,522,328. The use of compounds of formula I such as NN-dimethyl-1-[1-(4 chlorophenyl)cyclobutyl]-3-methylbutylamine and salts thereof in the treatment of Parkinson's disease is described in published PCT application WO 88/06444.

WO 00/56317 PCT/USOO/07202 The use of N,N-dimethyl-1-[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine and salts thereof in the treatment of cerebral function disorders is described in US Patent 4,939,175. The use of N,_N-dimethyl-1-[1-(4-chlorophenyl)cyclobutyl]-3 methylbutylamine hydrochloride in the treatment of obesity is described in 5 published PCT application W090/061 10. A particularly preferred form of this compound is N, N-dimethyl-1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine hydrochloride monohydrate (sibutramine hydrochloride) which is described in European Patent Number 230742. The use of N,N-dimethyl-1-[1-(4 chlorophenyl)cyclobutyl]-3-methylbutylamine and salts thereof for improving the 10 glucose tolerance of humans having Impaired Glucose Tolerance or Non-Insulin Dependent Diabetes Mellitus is described in published PCT application W095/20949. It will be appreciated by those skilled in the art that compounds of formula 15 I contain a chiral centre. When a compound of formula I contains a single chiral centre it may exist in two enantiomeric forms. The present invention includes the use of the individual enantiomers and mixtures of the enantiomers. The enantiomers may be resolved by methods known to those skilled in the art, for example by formation of diastereoisomeric salts or complexes which may be 20 separated, for example, by crystallisation; via formation of diastereoisomeric derivatives which may be separated, for example, by crystallisation, gas-liquid or liquid chromatography; selective reaction of one enantiomer with an enantiomer specific reagent, for example enzymatic oxidation or reduction, followed by separation of the modified and unmodified enantiomers; or gas-liquid or liquid 25 chromatography in a chiral environment, for example on a chiral support, for example silica with a bound chiral ligand or in the presence of a chiral solvent. It will be appreciated that where the desired enantiomer is converted into another chemical entity by one of the separation procedures described above, a further step is required to liberate the desired enantiomeric form. Alternatively, specific 30 enantiomers may be synthesised by asymmetric synthesis using optically active 2 WO 00/56317 PCT/USOO/07202 reagents, substrates, catalysts or solvents, or by converting one enantiomer to the other by asymmetric transformation. Preferred compounds of formula I are N, N-dimethyl-1 -[1 -(4-chlorophenyl) 5 cyclobutyl]-3-methylbutylamine, N-{1-[1-(4-chlorophenyl)cyclobutyl]-3 methylbutyl}-N- methylamine, and 1-[1-(4-chlorophenyl)cyclobutyl]-3 methylbutylamine including racemates, individual enantiomers and mixtures thereof, and pharmaceutically acceptable salts thereof. 10 The individual enantiomers can be prepared by enantioselective synthesis from optically active precursors, or by resolving the racemic compound which can be prepared as described above. Enantiomers of secondary amines of the formula I can also be prepared by preparing the racemate of the corresponding primary amine, resolving the latter into the individual enantiomers, and then 15 converting the optically pure primary amine enantiomer into the required secondary amine by methods described in British Patent Specification 2098602. Specific examples of compounds of formula I are: 20 (+)-N-[1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N-methylamine; (-)-N-{1 -[1 -(4-chlorophenyl)cyclobutyl-3-methylbutyl}-N-methylamine; (+)-1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine; (-)-1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine; (+)-N-{1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N-N-dimethylamine; 25 (-)-N-{1-[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N-N-dimethylamine. The hydrochloride salts are preferred in each case, but the free bases and other pharmaceutically acceptable salts are also suitable. 30 The compound of formula I may be administered in any of the known pharmaceutical dosage forms. The amount of the compound to be administered 3 WO 00/56317 PCTIUSOO/07202 will depend on a number of factors including the age of the patient, the severity of the condition and the past medical history of the patient and always lies within the sound discretion of the administering physician but it is generally envisaged that the dosage of the compound to be administered will be in the range 0.1 to 50 mg 5 preferably 1 to 30 mg per day given in one or more doses. Oral dosage forms are the preferred compositions for use in the present invention and these are the known pharmaceutical forms for such administration, for example tablets, capsules, granules, syrups and aqueous or oil suspensions. 10 The excipients used in the preparation of these compositions are the excipients known in the pharmacist's art. Tablets may be prepared from a mixture of the active compound with fillers, for example calcium phosphate; disintegrating agents, for example maize starch; lubricating agents, for example magnesium stearate; binders, for example microcrystalline cellulose or polyvinylpyrrolidone 15 and other optional ingredients known in the art to permit tableting the mixture by known methods. The tablets may, if desired, be coated using known methods and excipients which may include enteric coating using for example hydroxypropylmethylcellulose phthalate. The tablets may be formulated in a manner known to those skilled in the art so as to give a sustained release of the 20 compounds of the present invention. Such tablets may, if desired, be provided with enteric coatings by known methods, for example by the use of cellulose acetate phthalate. Similarly, capsules, for example hard or soft gelatin capsules, containing the active compound with or without added excipients, may be prepared by known methods and, if desired, provided with enteric coatings in a 25 known manner. The contents of the capsule may be formulated using known methods so as to give sustained release of the active compound. The tablets and capsules may conveniently each contain 1 to 50 mg of the active compound. Other dosage forms for oral administration include, for example, aqueous 30 suspensions containing the active compound in an aqueous medium in the presence of a non-toxic suspending agent such as sodium carboxy 4 WO 00/56317 PCT/USOO/07202 methylcellulose, and oily suspensions containing a compound of the present invention in a suitable vegetable oil, for example arachis oil. The active compound may be formulated into granules with or without additional excipients. The granules may be ingested directly by the patient or they may be added to a 5 suitable liquid carrier (for example, water) before ingestion. The granules may contain disintegrants, eg an effervescent couple formed from an acid and a carbonate or bicarbonate salt to facilitate dispersion in the liquid medium. The therapeutically active compounds of formula I may be formulated into 10 a composition which the patient retains in his mouth so that the active compound is administered through the mucosa of the mouth. Dosage forms suitable for rectal administration are the known pharmaceutical forms for such administration, for example, suppositories with 15 cocoa butter or polyethylene glycol bases. Dosage forms suitable for parenteral administration are the known pharmaceutical forms for such administration, for example sterile suspensions or sterile solutions in a suitable solvent. 20 Dosage forms for topical administration may comprise a matrix in which the pharmacologically active compounds of the present invention are dispersed so that the compounds are held in contact with the skin in order to administer the compounds transdermally. A suitable transdermal composition may be prepared 25 by mixing the pharmaceutically active compound with a topical vehicle, such as a mineral oil, petrolatum and/or a wax, e.g. paraffin wax or beeswax, together with a potential transdermal accelerant such as dimethyl sulphoxide or propylene glycol. Alternatively the active compounds may be dispersed in a pharmaceutically acceptable cream, gel or ointment base. The amount of active 30 compound contained in a topical formulation should be such that a therapeutically 5 WO 00/56317 PCT/US00/07202 effective amount of the compound is delivered during the period of time for which the topical formulation is intended to be on the skin. The therapeutically active compound of formula I may be formulated into 5 a composition which is dispersed as an aerosol into the patients oral or nasal cavity. Such aerosols may be administered from a pump pack or from a pressurised pack containing a volatile propellant. The therapeutically active compounds of formula I used in the method of 10 the present invention may also be administered by continuous infusion either from an external source, for example by intravenous infusion or from a source of the compound placed within the body. Internal sources include implanted reservoirs containing the compound to be infused which is continuously released for example by osmosis and implants which may be (a) liquid such as an oily 15 suspension of the compound to be infused for example in the form of a very sparingly water-soluble derivative such as a dodecanoate salt or a lipophilic ester or (b) solid in the form of an implanted support, for example of a synthetic resin or waxy material, for the compound to be infused. The support may be a single body containing all the compound or a series of several bodies each containing 20 part of the compound to be delivered. The amount of active compound present in an internal source should be such that a therapeutically effective amount of the compound is delivered over a long period of time. In some formulations it may be beneficial to use the compounds of the 25 present invention in the form of particles of very small size, for example as obtained by fluid energy milling. In the compositions of the present invention the active compound may, if desired, be associated with other compatible pharmacologically active 30 ingredients. 6 WO 00/56317 PCT/USOO/07202 The invention further provides the use of compounds of formula I in the manufacture of a medicament for aiding in weight loss after pregnancy. In another aspect, the invention further provides a pharmaceutical 5 composition for aiding in weight loss after pregnancy, comprising a compound of formula I in conjunction with a pharmaceutically acceptable diluent or carrier. Pregnancy can result in excessive weight gain and retention. A certain amount of weight gain during pregnancy is desirable. However weight gain 10 beyond the desired amount is predominantly maternal adipose tissue. It is this fat tissue that, in large measure, accounts for the postpartum retention weight gained during pregnancy. This retention reflects a postpartum energy balance that does not lead to catabolism of the gained adipose tissues. Administration of a compound of Formula I helps to change the energy balance. 15 Monoamine reuptake inhibitors have been used to treat certain of the disorders described in the present invention. However, these compounds are known to suffer from a number of disadvantages. Firstly such compounds are 20 not effective in all patients. Secondly where the compounds are effective they may not provide a complete cure of the disorder. Thirdly, there are many undesirable side-effects known with this type of compound. Such side-effects include nausea, sexual dysfunction, light headedness, somnolence, sweating, tremor, dry mouth, asthenia, insomnia, diarrhoea, headache, vomiting, anxiety, 25 drowsiness, dizziness, fever, rash or allergic reactions, arthralgia, myalgia, convulsions, hypomania and mania. Sibutramine (Formula 1, = CH 3 , R2 = CH 3 ) has a pharmacological profile which is unique amongst monoamine reuptake inhibitors. Through its 30 pharmacologically active metabolites, (metabolite 1, R 1 = H, R 2 = CH 3 in Formula I and metabolite 2, R 1 = H, R 2 = H in Formula I) sibutramine inhibits the reuptake 7 WO 00/56317 PCT/US00/07202 of all three monoamines differentiating it from serotonin (5-HT)-selective reuptake inhibitors, e.g. fluoxetine, noradenaline-selective reuptake inhibitors, e.g. desipramine, dopamine-selective reuptake inhibitors, e.g. bupropion, and serotonin-noradenaline reuptake inhibitors, e.g. venlafaxine (Table 1). It is this 5 unique combination of pharmacological actions which renders sibutramine, and the other compounds of formula I, efficacious in aiding weight loss after pregnancy. The assays below are performed in a similar manner to those described 10 in WO98/41528. TABLE Comparison of the in vitro monoamine reuptake inhibition profiles of Examples 1 15 and 2, and various reference monoamine reuptake inhibitors in rat brain tissue Ki (nM)

[

3 H]Noradenaline [3H]5-HT

[

3 H]Dopamine Example 1 3 18 24 Example 2 5 26 31 Bupropion 2590 18312 409 Desipramine 2 200 4853 Fluoxetine 320 11 2025 Venlafaxine 196 26 2594 The results are the means of 3 separate determinations Example 1 R 1 = H, R 2 = CH 3 in Formula I 8 WO 00/56317 PCT/USOO/07202 Example 2 R 1 = H, R 2 = H in FormulaI The efficacy of compounds of formula I in treating postpartum retention of weight is demonstrable through clinical trials in a relevant population set. 5 The invention has been described with reference to various specific embodiments. However, many variations and modifications may be made while remaining within the scope and spirit of the invention. 9

Claims

1. A method of aiding postpartum weight loss comprising administering to a human in need thereof a therapeutically effective amount of a compound of 5 formula I CH 3 H 3 CCHCH 2 CHNR 1 R 2 Cl / including enantiomers and pharmaceutically acceptable salts thereof in which R 1 and R 2 are independently H or methyl, in conjunction with a pharmaceutically 10 acceptable diluent or carrier.

2. A method as claimed in claim 1 in which the postpartum weight loss is associated with maternal adipose tissue. 15

3. A method as claimed in claim 1 or 2 wherein the compound of formula I is N,N-dimethyl-1-[1-(4-chlorophenyl)cyclobutyl]-3-methylbutylamine hydrochloride.

4. A method as claimed in claim 1 or 2 wherein the compound of formula I is N, N-dimethyl-1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine hydrochloride 20 in the form of its monohydrate.

5. A method as claimed in claim 1 or 2 wherein the compound of formula 1 is (+)-N-[1-[1-(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N-methylamine. 25

6. A method as claimed in claim 1 or 2 wherein the compound of formula 1 is (-)-N-{1 -[1 -(4-chlorophenyl)cyclobutyl-3-methylbutyl}-N-methylamine. 10 WO 00/56317 PCT/US00/07202

7. A method as claimed in claim 1 or 2 wherein the compound of formula 1 is (+)-1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine.

8. A method as claimed in claim 1 or 2 wherein the compound of formula 1 is 5 (-)-l -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine.

9 A method as claimed in claim 1 or 2 wherein the compound of formula 1 is (+)-N-{1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N-N-dimethylamine.

10 10. The method as claimed in claim 1 or 2 wherein the compound of formula I is (-)-N-{1-[1-(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N-N-dimethylamine.

11. The method as claimed in claim 1 or 2 wherein the compound of formula I is (±)-N-{1 -[1 -(4-chlorophenyl)cyclobutyl-3-methylbutyl}-N-methylamine. 15

12. The method as claimed in claim 1 or 2 wherein the compound of formula I is (±)-1-[1-(4-chlorophenyl)cyclobutyl]-3-methylbutylamine.

13. The method as claimed in claim 1 or 2 wherein the compound of formula 1 20 is (±)-N-{1 -[1-(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N-N-dimethylamine.

14. The use of a compound of formula I CH 3 H 3 CCHCH 2 CHNRR 2 25 including enantiomers and pharmaceutically acceptable salts thereof in which R 1 and R 2 are independently H or methyl, in the manufacture of a medicament for aiding in the postpartum weigh loss associated with a pregnancy 11 WO 00/56317 PCTIUSOO/07202

15. The use as claimed in claim 14 in which the weight gain is associated with maternal adipose tissue. 5

16. The use as claimed in claim 14 or15 in which the compound of formula Iis N,N-dimethyl-1 -[1 -(4-chlorophenyl)cyclobutyl]-3-methylbutylamine hydrochloride.

17. The use as claimed in claim 14 or 15 in which the compound of formula I is N,N-dimethyl-1-[1-(4-chlorophenyl)cyclobutyl]-3-methylbutylamine 10 hydrochloride monohydrate.

18. A pharmaceutical composition for use in postpartum weight loss, comprising a therapeutically effective amount of a compound of formula I CH 3 H 3 CCHC H 2 CHNR 1 R 2 15 Cl including enantiomers and pharmaceutically acceptable salts thereof in which R 1 and R 2 are independently H or methyl, in conjunction with a pharmaceutically acceptable diluent or carrier. 20

19. A pharmaceutical composition as claimed in claim 18 in which the compound of formula I is N,N-dimethyl-1-[1-(4-chlorophenyl)cyclobutyl]-3 methylbutylamine hydrochloride.

20. A pharmaceutical composition as claimed in claim 18 in which the 25 compound of formula I is N,N-dimethyl-1-[1-(4-chlorophenyl)cyclobutyl]-3 methylbutylamine hydrochloride monohydrate. 12