1-(4-Chlorophenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene → racemic (2'S,3S,4'R)-6-chloro-2'-(4-chlorophenyl)-4'-cyclohexyl-2,3-dihydro-2,6'-dioxo spiro[indole-3,3'-piperidine]-1-carboxylic acid ethyl ester

Participants

Reaction Steps

In a manner similar to the method described in example 4c, E/Z-6-chloro-3-cyclohexylmethylene-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester (0.40 g, 1.20 mmol) prepared in example 6b was reacted with 1-(4-chlorophenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene prepared in example 7a, in toluene to give racemic (2′S,3S,4′R)-6-chloro-2′-(4-chlorophenyl)-4′-cyclohexyl-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-carboxylic acid ethyl ester as a white solid (Yield 0.45 g, 72%).

Provenance & Evidence