Optically active aminopyridine derivative and use thereof
申请人:THE GREEN CROSS CORPORATION
公开号:EP0609518A1
公开(公告)日:1994-08-10
A (+) antipode of an aminopyridine derivative, which is represented by the formula (I)
wherein eacy symbol is as defined in the Specification, a salt thereof, and the use thereof as an agent for circulatory diseases. The compound of the invention is extremely low toxic and shows strong and long-lasting pharmacological action such as vasodepressor action. When used as a preventive or therapeutic agent for hypertension, in particular, the compound affords stable antihypertensive action even at diminished administration frequencies. Also, it can be used as a lipometabolism-improving agent.
In order to obtain a new, potent and selective histamine H3 receptor antagonist, chemical modifications of thioperamide, a well-known H3 receptor antagonist, were conducted. A new series of compounds has een synthesized by modifying the thiourea and cyclohexyl groups of thioperamide, and tested for H3 receptor affinity by receptor binding assay using plasma membrane from rat cerebral cortex. The thiourea group of thioperamide was found to be replaceable with a basic moiety such as formamidine or S-methylisothiourea. Replacement of the cyclohexyl group in thioperamide by a 1-adamantyl or an exo-2-norbornyl group increased the affinity for H3 receptor. Among the compounds synthesized, N-(1-adamantyl)-N', N'-[3-(4(5)-1H-imidazolyl)pentamethylene]formamidine 3f (AQ0145) showed the highest H3 receptor affinity, having a potent antagonistic activity. This compound was at least 1000-fold more active towards H3 than towards H1 and H2 receptors.