申请人:Eli Lilly and Company
公开号:US04820845A1
公开(公告)日:1989-04-11
The present invention provides a process for selectively alkylating pyrazoles comprising reacting a 3(5)-cyano-1H-pyrazole-4-carboxylic acid ester with a C.sub.4 -C.sub.8 alkene, or a C.sub.5 -C.sub.6 cycloalkene substituted at the 1-position with a C.sub.1 -C.sub.4 alkyl group, and a strong acid in a solvent which contains a strong electron withdrawing group. Also provided are new 3(5)-cyano-1H-pyrazole-4-carboxylic acid ester useful as starting materials in the process of the invention.
本发明提供了一种选择性烷基化吡唑的方法,包括将3(5)-氰基-1H-吡唑-4-羧酸酯与C.sub.4-C.sub.8烯烃或在1位上用C.sub.1-C.sub.4烷基取代的C.sub.5-C.sub.6环烯烃以及强酸在含有强电子吸引基的溶剂中反应。还提供了新的3(5)-氰基-1H-吡唑-4-羧酸酯作为本发明方法中的起始材料。