Water → N-Benzyl-1-[(R)-1-benzyl-3-(1-methyl-2-pyrrolidinylmethyl)-1H-indol-5-yl]-1-cyano-N-methylmethanesulfonamide

Participants

Reaction Steps

To a stirred solution of N-benzyl-1-cyano-N-methylmethanesulfonamide (from step (c), 643 mg, 2.9 mmol) in toluene (5 ml) at 0° C. under a nitrogen atmosphere was added potassium tert-butoxide (615 mg, 5.5 mmol) portionwise, maintaining the temperature below 5° C. The brown solution was then warmed to ambient temperature over a 10 min period, before tetrakis(triphenylphosphine) palladium(0) (181 mg, 0.16 mmol) was added in one portion. A solution of (R)-1-benzyl-5-bromo-3-(1-methyl-2-pyrrolidinylmethyl)-1H-indole (from step (d), 1.0 g, 2.6 mmol) in toluene (5 ml) was then added dropwise to the yellow slurry and the mixture was warmed to reflux. Reflux was maintained for 1.5 hr after which time the dark brown solution was cooled to ambient temperature. The reaction mixture was then poured into water (25 ml) and extracted with ethyl acetate (3×25 ml). The combined organic extracts were evaporated in vacuo to yield a brown oil. This was purified by flash column chromatography (ethyl acetate:hexane:diethylamine 1:1:0.1 as eluant) to give the title compound (1.09 g, 80%) as a brown oil.

Provenance & Evidence