PROCESSES FOR THE PREPARATION OF NOVEL NAPHTHYRIDINE DERIVATIVES

摘要

A process for efficiently preparing novel naphthyridine derivatives exhibiti ng high tachykinin receptor antagonism, which comprises reacting a compound represented by general formula (1) with a carboxylic acid derivative or othe r acylating agent: wherein R1, R2 and R3 are each independently hydrogen, lowe r alkyl, lower alkoxy, aryl, heteroaryl, amino or the like; and X1 and X2 are each halogeno.