反应详情

In a manner similar to the method described in example 55c, racemic (2′R,3R,4′S)-6-chloro-4′-(3-chloro-phenyl)-2′-(1-ethyl-propenyl)-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-methoxyethyl trimethylsilane (1.6 g, 2.8 mmol) prepared in example 81a was reacted with bromo-acetic acid tert-butyl ester and cesium carbonate in N,N-dimethylformamide to give racemic (2′R,3R,4′S)-1′-[(tert-butoxycarbonyl)methyl]-6-chloro-4′-(3-chlorophenyl)-2′-(1-ethyl-propenyl)-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-methoxyethyl trimethylsilane as a white foam (Yield 0.7 g, 37%).