Ethanethiol → 1H-Indole, 5-bromo-3-(2-pyrrolidinylmethyl)-, (R)-

Participants

Reaction Steps

3-(1-Benzyloxycarbonylpyrrolidin-2(R)-ylmethyl)-5-bromo-1H-indole (see Preparation 35B) (5.00 g, 12.10 mmol) was dissolved in dichioromethane and the resulting solution was added dropwise to a stirred mixture of boron-trifluoride.etherate (17.15 g, 14.9 ml, 12.1 mmol) and ethane thiol (21.4 g, 25.5 ml, 344 mmol) at room temperature under nitrogen. After 68 hours the reaction mixture was added by pipette to a 10% aqueous sodium carbonate solution (500 ml) and extracted with ethyl acetate (3×400 ml). The combined organic extract was dried (Na2SO4) and the solvent evaporated under reduced pressure. Purification by column chromatography on silica gel, eluting with dichioromethane: methanol:0.880 aqueous ammonia (90:10:1), yielded the title compound as a foam (2.1 g). Found: C,55.04; H,5.29; N,9.83. C13H15BrN2.3/50CH2Cl2 requires: C,55.10; H,5.35; N,9.83%.

Provenance & Evidence