3-氨基-5-甲基吡唑 、
methyl 2-(1-acetyl-2-oxoindolin-3-ylidene)-2-cyanoacetate 以
水 为溶剂,
生成 (3S,5'R)-3'-methyl-2,6'-dioxospiro[1H-indole-3,4'-5,7-dihydro-2H-pyrazolo[3,4-b]pyridine]-5'-carbonitrile 、 (3S,5'S)-3'-methyl-2,6'-dioxospiro[1H-indole-3,4'-5,7-dihydro-2H-pyrazolo[3,4-b]pyridine]-5'-carbonitrile