AU2007251901A1

AU2007251901A1 - Use of S-10 hydroxy-10, 11-dihydro-carbamazepine for the treatment of anxiety and bipolar disorders

Info

Publication number: AU2007251901A1
Application number: AU2007251901A
Authority: AU
Inventors: Graeme Bilbe; John F Cryan; Conrad Gentsch; Kevin Hall Mcallister; Markus Schmutz; Annick Vassout
Original assignee: Novartis AG
Current assignee: Novartis AG
Priority date: 2003-02-17
Filing date: 2007-12-20
Publication date: 2008-01-24

Description

I

Australian Patents Act 1990 Regulation 3.2 ORIGINAL COMPLETE SPECIFICATION STANDARD PATENT Invention Title "Use of S-10 hydroxy-10, 11-dihydro-carbamazepine for the treatment of anxiety and bipolar disorders" The following statement is a full description of this invention, including the best method of performing it known to us:- QAOPER\MCU4S1508 new di' 353.doc -1- Use of S-10 hydroxy-10, 11-dihydro-carbamazepine for the treatment of anxiety and bipolar disorders This application is a divisional of Australian Patent Application No. 2004212:328, the entire content of which is incorporated herein by reference.

SThe present invention relates to new pharmaceutical uses of a carbamazepine derivative.

More particularly the present invention relates to new pharmaceutical uses for a racemate of 0 the carbamazepine derivative of formula I

OH

CONH

2 and its pharmaceutically acceptable salts.

Racemic licarbazepine (MHD, formula I, 10-hydroxy-10,11 -dihydro-carbamazepine), the main metabolite of the antiepileptic drug oxcarbazepine (Trileptal is well known from the literature [see for example Schuetz H. et al., Xenobiotica 16(8), 769-778 (1986)] and can be prepared synthetically starting from oxcarbazepine according to conventional methods. It was demonstrated that the racemate (formula I) and both of its pure enantiomers are of equal efficacy against epilepsy.

In accordance with the present invention, it was now surprisingly found that the Senantiomer of the compound of formula I is substantially more efficacious than the Renantiomer in the prevention and the treatment of affective and attention disorders, anxiety and other psychiatric disorders with underlying anxiety symptomatologies.

Hence, the present invention pertains to the use of the racemate of the compound of formula I consisting of at least 85 S-enantiomer and not more than 15 R-enantiomer, hereafter referred to as "the racemate", the use of the pure S-enantiomer, and to the use of pharmaceutically acceptable salts of said racemate or enantiomer, for the treatment of affective and attention disorders, anxiety and other psychiatric disorders with underlying anxiety symptomatologies.

4-32875A -2- One embodiment of the present invention pertains to the use of the S-enantiomer of the compound of formula I or of a pharmaceutically acceptable salt thereof for the treatment of affective and attention disorders, anxiety and other psychiatric disorders with underlying anxiety symptomatologies.

0 The term "affective and attention disorders" as used herein includes, but is not restricted to depression or other psychiatric disorders like uni- and bi-polar disorders, e.g. manic- N depressive psychoses, extreme psychotic states, e.g. mania, pre-menstrual dysphoric Sdisorder, post-partum depression, post-menopausal depression, neurodegeneration-related depressive symptoms and depression.

The term "anxiety or other psychiatric disorders with underlying anxiety symptomatologies" as used herein includes, but is not restricted to general anxiety disorders, social anxiety disorders, post traumatic stress disorder, obsessive compulsive disorder, panic and anxiety occurring following cessation of psychostimulant intake.

The suitability of the agents of the invention for the treatment of affective and attention disorders can be evidenced, for example, in tests suitable for detecting drugs; reversing psycho-motor stimulatory effects. In particular, it can be evidenced in the Vogel conflict test described in the Example below. The person skilled in the pertinent art is fully enabled to select further relevant test models to prove such activity. The usefulness of the agents of the invention in the treatment of the above-mentioned disorders can be confirmed in suitable clinical studies. Suitable clinical studies are in particular randomized, double-blind, placebocontrolled, parallel studies in bi-polar mood disorders patients or patients having psychiatric disorders with underlying anxiety symptomatologies.

The Vogel conflict test described in the Examples below is the standard test to detect psychiatric, mainly anxiolytic and antidepressant drug action since various classes of anxiolytic and antidepressant drugs are effective in this test and since there is a high comorbidity between anxiety states and other psychiatric, depression disorders. The very surprising specific and high efficacy of, above all, the S-enantiomer in this test is therefore indicative of drug activity in anxiety, depression and other psychiatric disorders as defined above.

4-32875A -3-

O

The obtained results from the Vogel conflict test clearly demonstrate that the R-enantiomer at the highest dose used (200 mg/kg) is less efficacious than the S-enantiomer at the lowest S dose used (50 mg/kg), whereas the potency/efficacy ratio of the racemate is between that of c the R- and S-enantiomers. This finding is very surprising in the light of the anticonvulsant findings where all 3 compounds are equipotent, their potency is within a factor of less than 2.

For the treatment of the diseases mentioned above, appropriate dosage will of course vary depending upon, for example, the ratio of the different enantiomers, the host, the disease to Sbe treated, the mode of administration and the nature and severity of the condition being treated. However, in general, satisfactory results in animals are indicated to be obtained at a daily dosage of from about 1 to 300 mg/kg animal body weight of the racemate or the Senantiomer. In larger mammals, for example humans, an indicated daily dosage of the racemate or the S-enantiomer is in the range from about 10 to about 3000 mg of a compound according to the invention, conveniently administered, for example, in divided doses up to four times a day.

The racemate or the enantiomer may be administered in any usual manner, e.g. orally, for example in the form of tablets or capsules, or parenterally, for example in the form of injection solutions or suspensions.

The present invention also provides pharmaceutical compositions comprising the racemate of the compound of formula I or pharmaceutically acceptable salts of said racemate consisting of at least 51 S-enantiomer and not more than 49 R-enantiorer, preferably at least 85 S-enantiomer and not more than 15 R-enantiomer, or the S-enantiomer, in association with at least one pharmaceutical carrier or diluent, in particular, for the use in the treatment of affective and attention disorders or anxiety or other psychiatric disorders. with underlying anxiety symptomatologies. Such compositions may be manufactured in a conventional manner.

Unit dosage forms may contain for example from about 2.5 mg to about 1000 mg of the racemate or the S-enantiomer.

4-32875A -4-

O

SThe invention further relates to the use of a racemate or the S-enantiomer of the compound of formula I or of pharmaceutically acceptable salts of said racemate or enantiomer for the O manufacture of a pharmaceutical composition for the treatment of affective and attention C disorders or anxiety or other psychiatric disorders with underlying anxiety symptomatologies.

The invention further provides a method for the treatment of affective and attention disorders in a subject in need of such treatment, which comprises administering to said subject a therapeutically effective amount of a racemate according to the invention or of the Senantiomer or of a pharmaceutically acceptable salt of said racemate or enantiomer.

The invention further provides a method for the treatment of anxiety or other psychiatric disorders with underlying anxiety symptomatologies in a subject in need of such treatment, which comprises administering to said subject a therapeutically effective amount of a racemate according to the invention or of the S-enantiomer or of a pharmaceutically acceptable salt of said racemate or enantiomer.

One preferred embodiment of the invention relates to the use of the racemate of the invention or the S-enantiomer in the treatment of bipolar mood disorders.

Furthermore, the present invention provides a package comprising a pharmaceutical composition comprising the racemate of the compound of formula I consisting of at least 51 S-enantiomer and not more than 49 R-enantiomer, preferably at least 85 Senantiomer and not more than 15 R-enantiomer, or the S-enantiomer, or a pharmaceutically acceptable salts of said racemate or enantiomer, in association with at least one pharmaceutical carrier or diluent together with instructions for the use of said pharmaceutical composition in the treatment of affective and attention disorders or anxiety or other psychiatric disorders with underlying anxiety symptomatologies.

Preferably, the racemate consists of at least 95 S-enantiomer and not more than 5 Renantiomer, more preferably of at least 98 S-enantiomer and not more than 2 Renantiomer, most preferably of at least 99.5 S-enantiomer and not more than 0.5 Renantiomer 4-32875A

O

The racemates of the invention can, be obtained by mixing the pure enantiomers of the Q compound of formula I. The pure enantiomers of the compound of formula I can be obtained starting from the racemate by procedures known as such. The racemate may be separated into its enantiomers through the formation of diastereomeric salts, for example by salt formation with an enantiomer-pure chiral acid, or by means of chromatography, for example 0by HPLC, using chromatographic substrates with chiral ligands.

N. In one embodiment of the invention, the pure enantiomers of the compound of formula I are prepared according to the procedures described in the Examples below.

The following Examples serve to illustrate the invention without limiting the invention in its scope.

Abbreviations Ac acetyl aqu. Aqueous dansyl 5-(dimethylamino)-1-naphthalenesulfonyl Et ethyl HPLC high pressure liquid chromatography Me methyl NMR nuclear magnetic resonance RT room temperature THF tetrahydrofuran Ts tosyl Examples Example 1: Procedure for the enantioselective Transfer Hydrogenation of 10-Oxo-10,11acid amide to 0,11-Dihydro-10-hydroxy-5H- To a mixture of 10-oxo-10,11-dihydro-dibenzo[b,f]azepine-5-carboxylic acid amide (300 mg, 1.189 mmol) and RuCI[(1R,2R)-p-TsNCH(C6H 5

)CH(C

6

H

5

)NH

2 ](n 6 -p-cymene, Aldrich, 4-32875A -6-

O

SSwitzerland) (8.8 mg, 0.0138 mmol) in CH 2 Cl 2 (15 ml) is added dropwise a premixed solution Q of formic acid and NEt 3 328 mg:289 mg) at 23 "C and stirred for 10 min. The clear solution is heated to reflux for 16 h. The reaction mixture is cooled to RT, diluted with CH 2

CI

2 ml) and neutralised with aqu. NaHCO 3 After washing with brine the solution is concentrated under reduced pressure. The residue is purified by flash chromatography on Ssilica gel using a 6:1 EtOAc-MeOH mixture as eluent to afford of R(-)-10,11-dihydro-10- (enantiomeric purity (ee) 99 determined Q by HPLC on Chiracel OD, Retention time: 9.46 min. [a]D -195.3 (ethanol). 1 H-NMR (400 MHz, CDCI 3 ):7.70-7.20 8 5.30 (br s,1 5.10-4.60 (br s, 2 3.75-3.40 1 H), 3.20-2.90 1 2.50 (br s, 2 NMR-Datas refer to Lit.: Benes, J et al., J. Med. Chem.

1999, 42, 2582-2587. Molecular weight: 254.291 Example 2: Procedure for the enantioselective Transfer Hydrogenation of 10-Oxo-10,11acid amide to 0,11 -Dihydro-10-hydroxy-5H- To a mixture of 10-oxo-10,11-dihydro-dibenzo[b,/]azepine-5-carboxylic acid asmide (300 mg, 1.189 mmol) and RuCI[(1S,2S)-p-TsNCH(C 6

H

5

)CH(C

6

H

5 )NH](l 6 -p-cymene) (11 mg, 0.0173 mmol) in CH 2

CI

2 (15 ml) is added in two portions a premixed solution of formic acid and NEt 3 656 mg:578 mg) at 23 "C and stirred for 10 min. After that formic acid is added (50 pl) and the clear solution is heated to reflux for 16 h. The reaction mixture is cooled to RT, diluted with CH 2

CI

2 (20 ml) and neutralised with aqu. NaHCO 3 After washing with brine the solution is concentrated under reduced pressure. The residue is purified by flash chromatography on silica gel using a 6:1 EtOAc-MeOH mixture as eluent to afford of 10,11-dihydro-10-hydroxy-5H-dibenzo[b,t]azepine-5-carboxamide (ee 99 by HPLC on Chiracel OD). Retention time: 12.00 min. +196.6 (ethanol). 'H-NMR (400 MHz, CDCl 3 ):7.70-7.20 8 5.30 (br s,1 5.10-4.60 (br s, 2 3.75-3.40 (rn, 1 3.20- 2.90 1 2.50 (br s, 2 NMR-Datas refer to Lit.: Benes, J et al., J. Med. Chem.

1999, 42, 2582-2587. Molecular weight: 254.291 Alternative production: To a mixture of 10-oxo-10,11-dihydro-dibenzo[b,/]azepine-5carboxylic acid amide (300 mg, 1.189 mmol) and RuCI[(1S,2S)-p-dansyl-

NCH(C

6

H

5

)CH(C

6

H

5

)NH

2 ](q 6 -p-cymene) (8.5 mg, 0.012 mmol) in CH 2

CI

2 (15 ml) is added dropwise a premixed solution of formic acid and NEt 3 328 mg:289 mg) at 23 "C and 4-32875A -7-

O

stirred for 10 min. The clear solution is heated to reflux for 16 h. The reaction mixture is cooled to RT, diluted with CH 2

C

2 (20 ml) and neutralised with aqu. NaHCO 3 After washing with brine the solution is concentrated under reduced pressure. The residue is purified by flash chromatography on silica gel using a 6:1 EtOAc-MeOH mixture as eluent to afford of S(+)-10,11-dihydro-10-hydroxy-5H-dibenzo[b,fJazepine-5-carboxamide.

Example 3: Preparation of RuCl((1S,2S)-p-dansylNCH(C 6

H

5 )CH(C6H 5

)NH

2 p-cymene) ta) Preparation of (S,S)-5-dimethylamino-naphthalene- -sulfonic acid (2-amino-1,2-diphenyl- Sethyl)-amide: To a solution of (S,S)-diphenylethylenediamine (250 mg, 1.2 mrnol) and triethylamine (0.5 ml) in THF is added dropwise a solution of dansyl chloride (318 mg, 1.2 mmol) in THF (2 ml) at 0°C. After stirring 16 h at RT the solvent is removed in vacuum and the residue is resolved in methylenchloride (20 ml). The organic solution is washed with NaHCO 3 solution (5 ml), dried over Na 2

SO

4 and after filtration the solvent is removed. Flash chromatographie afford (S,S)-5-dimethylamino-naphthalene-1-sulfonic acid (2-amino-1,2diphenyl-ethyl)-amide as yellow oil which crystallizes by drying in vacuum. M: 445.59. 'H- NMR (400 MHz, CDCl3):8.36 J= 7.5 Hz, 2 8.17 (dd, J= 7.2, 1.2 Hz, 1 7.47 (dd, J= 8.8 Hz, 1 7.34 (dd, J= 8.5 Hz, 1 7.24-7.16 4 7.11 J= 7.5 Hz, 1 6.99- 6.74 6 4.61 J 8.5 Hz, 1 4.20 J 8.5 Hz, 1 2.80 6 H).

b) Preparation of RuCI[(1S,2S)-p-dansylNCH(C 6 Hs)CH(C 6 H)NHz(rf6-p-cymene): A solution of (S,S)-5-dimethylamino-naphthalene-1-sulfonic acid (2-amino-1,2-diphenyl-ethyl)-amide 0.18 mmol), NEt 3 (36 mg, 0.36 mmol) and [RuCI 2 (p-cymene)] 2 (55 mg, 0.09mmol) in 2-propanol is heated at 80 0 C for 1 h. The solvent is removed after that und the dark red residue is washed with water (2 ml). The solid is dried in vacuum and used without any purification. M: 715.34.

Example 4: Vogel Conflict Test a) Description of method: The method, which detects anxiolytic and related other psychiatric activity, follows that described by Vogel et al, Psychopharmacologia 1971;21:1-7 Anxiolytics and antidepressants Fontana et al., Psychopharmacology 1989;98(2):157-62) of various classes increase punished drinking.

4-32875A

O

SRats are deprived of water for 48 hours and are then placed individually into a transparent SPlexiglas enclosure (15 x 32 x 34 cm) with a floor consisting of stainless steel bars (0.4 cm) spaced 1 cm apart. The back wall of the enclosure is made of opaque Plexiglass thereby concealing the observer from the experimental animal. In the centre of the opposite wall, cm above the floor, a metal water spout protrudes into the cage and is connected to one Spole of a shock generator (Apelex Type 011346). The other pole of the shock generator is connected to the metal grid floor. The rat is left to explore until it found the water spout.

C Then, every time it drinks, it receives a slight electric shock (1.7 mA, 1 sec.) 2 seconds after it starts lapping. The number of shocks received (punished drinkings) is counted during a 3 minute period. 15 rats are studied per group. The test is performed blind. Compounds are evaluated at 50, 100 and 200 mg/kg, administered p.o. 60 minutes before the test, and compared with a vehicle control group. Clobazam (64 mg/kg), administered under the same experimental conditions, is used as reference substance. All substances are evaluated within the same experiment and compared with the same vehicle and reference substance controls. Data are analyzed by comparing treated groups with vehicle control using unpaired Student's t tests.

b) Results: The results are summarized in Tables 1-3. They clearly demonstrate that the Renantiomer at the highest dose used (200 mg/kg) is less efficacious than the S-enantiomer at the lowest dose used (50 mg/kg), whereas the potency/efficacy ratio of the Racemate is between that of the R- and S-enantiomers. In addition, whereas the maximum efficacy of the R-enantiomer is less than that of the positive control, clobazam, the efficacy of the S-enantiomer surpasses that of clobazam at all doses tested.

TABLE 1 EFFECTS OF THE RACEMATE AND CLOBAZAM IN THE VOGEL CONFLICT TEST IN THE RAT RATS PER GROUP) M3 PUNISHED DRINKING (mg/kg) (number of shocks) 4-32875A -9p.o. -60 min mean s.e.m. p change value from control Vehicle 4.4 0.2 5.9 0.5 0.012 +34% 100 8.4 1.0 0.001 +91% 200 10.4 1.5 0.001 +136%

CLOBAZAM

64 mg/kg 8.2 1.1 0.003 +86% p.o. -60 min Student's t test: =p 0.05; 0.01; p <0o.01

U

4-32875A TABLE 2 EFFECTS OF THE R-ENANTIOMER AND CLOBAZAM IN THE VOGEL CONFLICT TEST IN THE RAT RATS PER GROUP) M4 PUNISHED DRINKING (mg/kg) (number of shocks) p.o. -60 min mean s.e.m. p change value from control Vehicle 4.4 0.2 5.0 0.4 NS 0.203 +14% 100 5.5 0.5 NS 0.088 200 7.4 1.3 0.033 +68%

CLOBAZAM

64 mg/kg 8.2 1.1 0.003 +86% p.o. -60 min Student's t test: NS Not Significant; p 0.05; p 0.01 4-32875A 11 TABLE 3 EFFECTS OF THE S-ENANTIOMER AND CLOBAZAM IN THE VOGEL CONFLICT TEST IN THE RAT RATS PER GROUP) PUNISHED DRINKING (mg/kg) (number of shocks) p.o. -60 min mean s.e.m. p change value from control Vehicle 4.4 0.2 8.4 ±1.3 0.006 +91% 100 9.5 1.0 0.000 +116% 200 10.5 1.3 0.000 +139%

CLOBAZAM

64 mg/kg 8.2 1.1 0.003 +86% p.o. -60 min Students t test 0.01; p 0.001

Claims

4-32875A -12- O SWhat is claimed is: 1. The use of a racemate of the compound of formula I OH SCONH 2 consisting of at least 85 S-enantiomer and not more than 15 R-enantiomer or of the S-enantiomer of formula I or of pharmaceutically acceptable salts of said racemate or said enantiomer for the manufacture of a pharmaceutical composition for the treatment of anxiety or other psychiatric disorders with underlying anxiety symptomatologies. 2. The use of a racemate of the compound of formula I OH N CONH 2 or of pharmaceutically acceptable salts of said racemate consisting of at least 85 S- enantiomer and not more than 15 R-enantiomer for the manufacture of a pharmaceutical composition for the treatment of anxiety. 3. The use of a racemate of the compound of formula I 4-32875A -13- O OH N 1 CONH 2 i' or of pharmaceutically acceptable salts of said racemate consisting of at least 85 S- enantiomer and not more than 15 R-enantiomer for the manufacture of a pharmaceutical composition for the treatment of other psychiatric disorders with O c underlying anxiety symptomatologies. 4. The use according to any one of claims 1 to 3 wherein the racemate consists of at least 95 S-enantiomer and not more than 5 R-enantiomer. The use to any one of claims 1 to 3 wherein the racemate consists of at least 98 S-enantiomer and not more than 2 R-enantiomer.
6. The use of the S-enantiomer of the compound of formula I OH I CONH 2 for the manufacture of a pharmaceutical composition for the treatment of anxiety or other psychiatric disorders with underlying anxiety symptomatologies.
7. A method for the treatment of anxiety in a subject in need of such treatment, which comprises administering to said subject a therapeutically effective amount of a racemate of the compound of formula I 4-32875A -14- OH or of pharmaceutically acceptable salts of said racemate consisting of at least 85 S- enantiomer and not more than 15 R-enantiomer.
8. A method for the treatment of anxiety or other psychiatric disorders with underlying anxiety symptomatologies in a subject in need of such treatment, which comprises administering to said subject a therapeutically effective amount of a racemate of the compound of formula I OH N I CONH 2 consisting of at least 85 S-enantiomer and not more than 15 R-enantiomer, or the S-enantiomer of formula I, or of pharmaceutically acceptable salts of said racemate or enantiomer.
9. A pharmaceutical composition comprising as active agent a racemate of the compound of formula I OH CONH 2 4-32875A O O or pharmaceutically acceptable salts of said racemate consisting of at least 51 S- Senantiomer and not more than 49 R-enantiomer in association with pharmaceutically acceptable carriers. A package comprising a pharmaceutical composition according to claim 9 together Swith instructions for the use of said pharmaceutical composition in the treatment of anxiety or of other psychiatric disorders with underlying anxiety symptomatologies.
11. A racemate of the compound of formula I OH I CONH 2 consisting of at least 85 S-enantiomer and not more than 15 R-enantiomer, or the S-enantiomer of formula I, or a pharmaceutically acceptable salts of said racemate or said enantiomer, for the manufacture of a pharmaceutical composition for the treatment of affective and attention disorders.
12. The use of a racemate of the compound of formula I OH CONH, or of pharmaceutically acceptable salts of said racemate consisting of at least 85 S- enantiomer and not more than 15 R-enantiomer for the treatment of affective and attention disorders. 4-32875A -16- O 0 13. The use according to any one of claims 11 or 12 wherein the racemate consists of at least 95 S-enantiomer and not more than 5 R-enantiomer.
14. The use to any one of claims 11 or 12 wherein the racemate consists of at least 98 S-enantiomer and not more than 2 R-enantiomer. The use of the S-enantiomer of the compound of formula I OH CONH 2 or of a pharmaceutically acceptable salt of said enantiomer for the manufacture of a pharmaceutical composition for the treatment of affective and attention disorders.
16. A method for the treatment of affective and attention disorders in a subject in need of such treatment, which comprises administering to said subject a therapeutically effective amount of a racemate of the compound of formula I OH CONH 2 or of pharmaceutically acceptable salts of said racemate consisting of at least 85 S- enantiomer and not more than 15 R-enantiomer.
17. A method for the treatment of affective and attention disorders in a subject in need of such treatment, which comprises administering to said subject a therapeutically effective amount of the S-enantiomer of the compound of formula I 4-32875A -17- O 0 OH CONH 2 In or of a pharmaceutically acceptable salt of said enantiomer. (N
18. The use according to any one of claims 11 to 15 or the method according to claim l 16 or 17, wherein the affective and attention disorders are bipolar disorders.
19. A pharmaceutical composition comprising as active agent a racemate of the compound of formula I OH CONH 2 or pharmaceutically acceptable salts of said racemate consisting of at least 51 S- enantiomer and not more than 49 R-enantiomer, optionally in association with pharmaceutically acceptable carriers. A package comprising a pharmaceutical composition according to claim 19 together with instructions for the use of said pharmaceutical composition for the treatment of affective and attention disorders.