(Z)-3-[4-(4-Chloro-phenyl)-5-cyano-3-methylsulfanyl-6-oxo-1,6-dihydro-pyridin-2-ylamino]-2-cyano-acrylic acid ethyl ester 以
N,N-二甲基甲酰胺 为溶剂,
反应 4.5h,
以68%的产率得到8-(4-Chloro-phenyl)-7-cyano-6-hydroxy-4-imino-9-methylsulfanyl-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid ethyl ester