4-(4-chloro-1-methyl-5-phenyl-1H-pyrazolo[3,4-c]pyridazin-3-yl)benzonitrile 、 4-chloro-3-(3-iodophenyl)-1-methyl-5-phenyl-1H-pyrazolo[3,4-c]pyridazine 、 4-chloro-3-(4-iodophenyl)-1-methyl-5-phenyl-1H-pyrazolo[3,4-c]pyridazine 生成 3-(4-chloro-1-methyl-5-phenyl-1H-pyrazolo[3,4-c]pyridazin-3-yl)benzonitrile