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