2,4-dimethyl-6-methylsulfanyl-4H-pyrazolo[1,5-a]pyrido[4,3-d]pyrimidin-9-one 、
6-chloro-4-methyl-4H-pyrazolo[1,5-a]pyrido[4,3-d]pyrimidin-9-one 以4-methyl-6-(methylthio)pyrazolo[1,5-a]pyrido[4,3-d]pyrimidin-9(4H)-one is obtained的产率得到4-methyl-6-methylsulfanyl-4
H-pyrazolo[1,5-
a]pyrido[4,3-
d]pyrimidin-9-one