racemic (2'R,3R,4'S)-6-chloro-4'-(3-chlorophenyl)-2,3-dihydro-2'-(2-methylphenyl)-2,6'-dioxospiro[indole-3,3'-piperidine]-1-carboxylic acid tert-butyl ester 、
lithium;hydride 、
溴乙酸甲酯 以to give racemic 2′R,3R,4′S)-6-chloro-4′-(3-chlorophenyl)-2,3-dihydro-1′-[(methoxycarbonyl)-methyl]-2′-(2-methylphenyl)-2,6′-dioxospiro[indole-3,3′-piperidine]-1-carboxylic acid tert-butyl ester as a white solid (Yield: 0.37 g, 32%)的产率得到6-Chloro-4'-(3-chlorophenyl)-2,3-dihydro-1'-[(methoxycarbonyl)-methyl]-2'-(2-methylphenyl)-2,6'-dioxo spiro[indole-3,3'-piperidine]-1-carboxylic acid tert-butyl ester