3-(1-benzenesulfonyl-3-iodo-1H-indole-5-carbonyl)-3-benzyl-pyrrolidine-1-carboxylic acid tert-butyl ester → 3-(1-benzenesulfonyl-3-cyano-1H-indole-5-carbonyl)-3-benzyl-pyrrolidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

Copper(I) cyanide (76 mg, 0.852 mmol) was added to a 25 mL round bottom flask charged with 3-(1-benzenesulfonyl-3-iodo-1H-indole-5-carbonyl)-3-benzyl-pyrrolidine-1-carboxylic acid tert-butyl ester (143 mg, 0.213 mmol), followed by 1,1′-bis(diphenylphosphino)ferrocene (24 mg, 0.043 mmol) and tris(dibenzylideneacetone) dipalladium(0) (10 mg, 0.011 mmol). 1,4-Dioxane (1.5 mL) was then added and the mixture was heated to reflux under nitrogen atmosphere for one hour. The reaction mixture was cooled to room temperature and filtered through a celite pad. The filter cake was rinsed with EtOAc and the filtrate was concentrated under reduced pressure. The residue was purified by flash chromatography (30% of EtOAc in hexane) to give 115 mg (95% yield) of 3-(1-benzenesulfonyl-3-cyano-1H-indole-5-carbonyl)-3-benzyl-pyrrolidine-1-carboxylic acid tert-butyl ester as a pale yellow foam.

Provenance & Evidence