1-(2,4-Dimethyl-phenyl)-2,7-dimethyl-4-oxo-1,4-dihydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester 在
氢氧化钾 、
盐酸羟胺 作用下,
以
1,4-二氧六环 为溶剂,
以47%的产率得到1-(2,4-Dimethyl-phenyl)-2,7-dimethyl-4-oxo-1,4-dihydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid hydroxyamide