Z-6-chloro-3-cyclopentylmethylene-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester 、
1-(3-chlorophenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene 以
甲苯 为溶剂,
以to give racemic (2′S,3S,4′R)-6-chloro-2′-(3-chlorophenyl)-4′-cyclopentyl-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-carboxylic acid ethyl ester as an off-white foam (Yield 0.26 g, 52%)的产率得到racemic (2'S,3S,4'R)-6-chloro-2'-(3-chlorophenyl)-4'-cyclopentyl-2,3-dihydro-2,6'-dioxo spiro[indole-3,3'-piperidine]-1-carboxylic acid ethyl ester