The asymmetric synthesis of γ-substituted glutamic acid derivatives via a glutamic acid γ-enolate synthon
作者:Marco Del Bosco、Andrew N.C. Johnstone、Giorgia Bazza、Stefania Lopatriello、Michael North
DOI:10.1016/0040-4020(95)00455-h
日期:1995.7
N-Z-glutamate with lithium hexamethyldisilazide gives the γ-enolate regioselectively. Reaction of this enolale with electrophiles gives γ-substituted glutamicacid derivatives including the conformationally constrained glutamate analogue trans-piperidine-2,4-dicarboxylic acid. No racemisation occurs during these reactions.
Details of structure-activity relationships (SAR) for P2 moiety of a P1 2-cyanopyrrolidine dipeptidyl peptidase IV (DPP-IV) inhibitor 4a including stereochemistry are presented. Based on this information, a series of PI (N-alkyl)aminoacetonitrile analogs 9-20 possessing optimal P2 structure were synthesized and evaluated as inhibitors of DPP-IV. Among them, a representative compound 11, N-(cyanomethyl)-N-ethyl-L-prolinamide, was further evaluated to determine its effect on the plasma glucose level. Also 4a, 10, and 11 were evaluated for their isozyme selectivity to predict their safety problems. (C) 2007 Elsevier Ltd. All rights reserved.