Rhodanine derivative, process for preparing the same and pharmaceutical composition containing the same
申请人:KAKEN PHARMACEUTICAL CO., LTD.
公开号:EP0291007A1
公开(公告)日:1988-11-17
A rhodanine derivative having the formula (I):
wherein R is a branched alkyl group having 5 to 7 carbon atoms or a cycloalkylalkyl group having 5 to 7 carbon atoms which may be substituted by a halogen atom; or a nontoxic salt thereof. The rhodanine derivatives (I) and their nontoxic salts have excellent aldose reductase inhibiting activity and low toxicity, and therefore can be used as therapeutic agent for diabetic complications.
5-Alkyl-3-carboxymethylrhodanines (2) were prepared from 5-alkylmethylidene-3-carboxymethylrhodanines (1). The exo double bond of 1 was successfully reduced with NaBH4. The 1, 4-addition reaction path was confirmed on the basis of proton nuclear magnetic resonance spectrum of the product (4b) obtained from the reduction of 3 using NaBD4. Optical resolution of the tert-butyl compound (2i) was achieved upon epimerization-crystallization method using L-3-amino-ε-caprolactam. The alkyl compounds (2) and the optical active compounds ((+)-2i, (-)-2i) were evaluated for aldose reductase inhibitory potency.