1-(3-chlorophenyl)-3-trimethylsilyloxy-2-aza-1,3-butadiene 、
6-chloro-3-(3-chloro-benzylidene)-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester 以
甲苯 为溶剂,
反应 1.0h,
以100%的产率得到rac-(2'R,3R,4'S)-6-chloro-2',4'-bis(3-chlorophenyl)-2,3-dihydro-2,6'-dioxo-spiro[indole-3,3'-piperidine]-1-carboxylic acid ethyl ester