3-butyl-7-chloro-5-methyl-3H-imidazo[4,5-b]pyridine-6-carboxylic acid ethyl ester 、
7-chloro-3,5-dimethyl-3H-imidazo[4,5-b]pyridine-6-carboxylic acid ethyl ester 以7-butoxy-3,5-dimethyl-3H-imidazo[ 4,5-b]pyridine-6-carboxylic acid, ethyl ester is formed的产率得到7-butoxy-3,5-dimethyl-3
H-imidazo[4,5-
b]pyridine-6-carboxylic acid ethyl ester