New process for preparing an 1H-indazol-3-ylacetic acid derivative
申请人:FUJISAWA PHARMACEUTICAL CO., LTD.
公开号:EP0008759A2
公开(公告)日:1980-03-19
A process for preparing an 1H-indazol-3-ylacetic acid derivative of the formula:
by reacting an aminoacetic acid derivative of the formula:
with a hydrazine compound and, if desired, esterification or reacting a propionic acid derivative of the formula:
with a N-nitrosating agent, and cyclization.
Herein, the discovery of a novel solvent directed cascade synthesis of biologically relevant indazole aceticacid derivatives is described. Notably, the method is simple, transition-metal free and provides access to new heterocyclic building- blocks in moderate to excellent yields.