ethyl 7-oxo-4,5,6,7-tetrahydro-1H-indazole-3-carboxylate 在
benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate 、
potassium carbonate 、
N,N-二异丙基乙胺 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 2.0h,
生成 ethyl 7-oxo-1-{2-oxo-2-[(2-oxobutyl)amino]ethyl}-4,5,6,7-tetrahydro-1H-indazole-3-carboxylate