Bicycloamine derivatives

a technology of bicycloamine and derivatives, applied in the field of bicycloamine derivatives, can solve the problems of inadequate inhibitory activity against ectopic firing and side effects, and achieve excellent inhibitory action of sodium channel, excellent therapeutic effect, and high utility as drugs.

Inactive Publication Date: 2010-12-30
EISIA R&D MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0095]The compounds represented by formula (I) of the invention have excellent sodium channel inhibitory action, and the invention can therefore provide novel bicycloamine compounds and pharmaceutically acceptable salts thereof that have high utility as drugs when comprehensively considered from the viewpoint of pharmacological activity, as well as novel pharmaceutical compositions comprising the same. The compounds of the invention and pharmaceutical compositions comprising the same can exhibit excellent therapeutic effect for diseases for which sodium channel inhibition is effective, and are promising as therapeutic agents and analgesics for various kinds of neuralgia (for example, diabetic neuralgia, HIV-induced neuralgia, postherpetic neuralgia, trigeminal neuralgia, stump pain, post-spinal cord injury pain, thalamic pain and post-apoplectic pain), neuropathy, epilepsy, insomnia, premature ejaculation and the like.

Problems solved by technology

While sodium channel inhibitors are thus effective as treatments for the diseases mentioned above, sodium channels are also present in non-neuronal tissue such as in the muscles and heart, such that they exhibit side-effects when systemically administered.
This compound has an inhibitory activity against sodium channels in cultured rat hippocampus but its inhibitory activity against ectopic firing is described as inadequate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 1

(Endo)-3-(4-fluorobenzyloxy)-8-azabicyclo[3.2.1]octane hydrochloride

[0667]

(1) (Endo)-3-(4-fluorobenzyloxy)-8-methyl-8-azabicyclo[3.2.1]octane

[0668]Tropine (25.0 g) was dissolved in 1-methyl-2-pyrrolidinone (350 ml), and then sodium hydride (60% in oil) (9.2 g) was added and the mixture was stirred at 75° C. for 2 hours. The reaction mixture was cooled on ice, 4-fluorobenzyl bromide (26.5 ml) was added and the mixture was stirred at room temperature for 69 hours. Ice water was added to the reaction mixture and extraction was performed with n-heptane. The organic layer was washed with water and brine in that order and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain the title compound (36.76 g).

(2) (Endo)-3-(4-fluorobenzyloxy)-8-azabicyclo[3.2.1]octane hydrochloride

[0669]The compound obtained in Production Example 1-(1) (36.76 g) was dissolved in 1,2-dichloroethane (150 ml), and 1-chloroethyl chloroformate (31.9 ml) was added ...

production example 2

(Endo)-3-(3-fluorobenzyloxy)-8-azabicyclo[3.2.1]octane hydrochloride

[0671]

(1) (Endo)-3-(3-fluorobenzyloxy)-8-methyl-8-azabicyclo[3.2.1]octane

[0672]The title compound (21.34 g) was obtained from tropine (15.0 g) and 3-fluorobenzyl bromide by the method similar to Production Example 1-(1).

(2) (Endo)-3-(3-fluorobenzyloxy)-8-azabicyclo[3.2.1]octane hydrochloride

[0673]The compound obtained in Production Example 2-(1) (21.34 g) was dissolved in 1,2-dichloroethane (197 ml), and 1-chloroethyl chloroformate (18.4 ml) was added. Stirring was then carried out at room temperature for 30 minutes and at 110° C. for 3 hours. The reaction mixture was concentrated under reduced pressure and methanol (304 ml) was added to the residue, prior to heating to reflux for 3 hours. The reaction mixture was concentrated under reduced pressure. Acetone-diethyl ether (10:1) was added to the residue, and the solid was collected by filtration to obtain the title compound (12.94 g).

[0674]1H-NMR (400 MHz, DMSO-d6);...

production example 3

(Endo)-3-(2-methylbenzyloxy)-8-azabicyclo[3.2.1]octane hydrochloride

[0675]

(1) (Endo)-8-methyl-3-(2-methylbenzyloxy)-8-azabicyclo[3.2.1]octane

[0676]The title compound (12.74 g) was obtained from tropine (10.0 g) and 2-methylbenzyl bromide by the method similar to Production Example 1-(1).

(2) (Endo)-3-(2-methylbenzyloxy)-8-azabicyclo[3.2.1]octane hydrochloride

[0677]The title compound (8.4 g) was obtained from the compound obtained in Production Example 3-(1) (12.74 g) by the method similar to Production Example 1-(2).

[0678]1H-NMR (400 MHz, DMSO-d6); δ1.88-1.94 (m, 2H), 2.02-2.19 (m, 6H), 2.26 (s, 3H), 3.70-3.74 (m, 1H), 3.89-3.95 (m, 2H), 4.45 (s, 2H), 7.12-7.22 (m, 3H), 7.27-7.32 (m, 1H), 8.91 (br s, 1H).

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Abstract

Compounds represented by formula (I) and pharmaceutically acceptable salts thereof have excellent sodium channel inhibitory action and are useful as therapeutic agents and analgesics for various kinds of neuralgia, neuropathy, epilepsy, insomnia, premature ejaculation and the like.wherein Q represents ethylene, etc., R1, R2 and R3 represent hydrogen, etc., X1 represents C1-6 alkylene, etc., X2 represents C1-6 alkylene, etc., A1 represents a 5- to 6-membered heterocyclic group, etc., and A2 represents C6-14 aryl, etc.

Description

TECHNICAL FIELD[0001]The present invention relates to bicycloamine derivatives having sodium channel inhibitory action, and particularly 8-azabicyclo[3.2.1]octane or 9-azabicyclo[3.3.1]nonane derivatives or pharmaceutically acceptable salts thereof.BACKGROUND ART[0002]Compounds having sodium channel inhibitory action are known to be useful as treatment for various types of neuralgia (for example, postherpetic neuralgia, diabetic neuralgia, HIV-induced neuralgia and the like).[0003]Compounds having sodium channel inhibitory action include Lidocaine, Carbamazepine, Mexiletine, Amitriptyline and the like, which are already used as therapeutic agents for various types of neuralgia. For example, Lidocaine is used as a treatment for postherpetic neuralgia, and Carbamazepine is used as a treatment for trigeminal neuralgia.[0004]It has also been reported that Mexiletine and Lidocaine are effective as analgesics (see Non-patent documents 1-3, for example).[0005]The following pharmacological ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D451/02A61K31/517A61K31/535C07D498/02C07D513/02A61K31/4985A61P25/08A61K31/501A61P25/00A61K31/46A61K31/506A61K31/55A61K31/53A61K31/498A61K31/5365A61P15/00A61P3/10A61K31/495A61K31/5377
CPCC07D451/02C07D451/04C07D451/06C07D519/00A61P15/00A61P25/00A61P25/04A61P25/08A61P25/20A61P29/02A61P3/12A61P43/00A61P3/10
Inventor OZAKI, FUMIHIROSOEJIMA, MOTOHIROISHIDA, TASUKUNORIMINE, YOSHIHIKOKURUSU, NOBUYUKIDOI, ERIKOKANEKO, TOSHIHIKOHASEGAWA, DAIJUKOBAYASHI, KIYOAKIYAMAMOTO, NOBORU
Owner EISIA R&D MANAGEMENT CO LTD
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