Z-6-chloro-3-(3-chloro-benzylidene)-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester 、 1-(4-Chlorophenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene 以
甲苯 为溶剂,
以to give racemic (2′R,3R,4′S)-6-chloro-2′-(4-chlorophenyl)-4′-(3-chlorophenyl)-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-carboxylic acid ethyl ester as a yellow solid (Yield 0.45 g, 72%)的产率得到racemic (2'R,3R,4'S)-6-chloro-2'-(4-chlorophenyl)-4'-(3-chlorophenyl)-2,3-dihydro-2,6'-dioxo spiro[indole-3,3'-piperidine]-1-carboxylic acid ethyl ester