1-(Benzenesulfonyl)-5-bromo-1H-indole → 1-Benzenesulfonyl-5-[4-(4-benzyl-piperidin-1-yl)-but-1-ynyl]-1H-indole

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Reaction Steps

A mixture of 1-benzenesulfonyl-5-bromoindole (1.34 g, 4 mmol), 4-benzyl-1-(3-butynyl)-piperidine (908 mg, 4 mmol) and tetrakis(triphenylphosphine)palladium (0) (600 mg) is stirred in pyrrolidine (50 mL) at 50° C. under N2 overnight. Most of the pyrrolidine is evaporated and the residue purified by medium-pressure column chromatography on silica gel eluting with 50% increasing to 100% EtOAc/hexanes to give the title compound as a pale yellow oil (1.55 g)

Provenance & Evidence