4-hydrazino-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid ethyl ester 、
1-乙基-4-肼基-1H-吡唑并[3,4-b]吡啶-5-羧酸乙酯 以5-chloro-2-methyl-8H-pyrazolo[1,5a]pyrazolo[4',3':5,6]pyrido[3,4-e]pyrimidine and N-butyl-2-methyl-8H-pyrazolo[1,5-a]pyrazolo[4',3':5,6]pyrido[3,4-e]pyrimidin-5-amine respectively, are obtained的产率得到