ethyl cyano-(1-methyl-2-oxo-1,2-dihydro-indol-3-ylidene)-acetate 、 methyl 2-(2-(2-oxopropylidene)hydrazineyl)benzoate 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
1,4-二氧六环 为溶剂,
反应 5.0h,
以79%的产率得到2,3'-spiro(ethyl 3-acetyl-9-oxo-2,9,10-trihydro-4,4a,10-triazaphenanthrene-1-carboxylate)-1'-methyl-2'-oxindole