Triethylamine → Dimethyl 2-(4-tert-butoxycarbonylpiperazin-1-yl)-2-[(4-but-2-ynyloxybenzenesulfonylamino)methyl]malonate

Participants

Reaction Steps

1.1 ml (8 mmol) of triethylamine and then 1.8 ml (7 mmol) of 4-but-2-ynyloxybenzenesulfonyl chloride are added to a solution of 2.5 g (7 mmol) of dimethyl 2-aminomethyl-2-(4-tert-butoxycarbonylpiperazin-1-yl)malonate in 30 ml of dichloromethane. The reaction medium is stirred at ambient temperature for 2 hours and then concentrated under vacuum. The crude product obtained is purified by chromatography on silica gel, elution being carried out with a 70/30 heptane/ethyl acetate mixture. 2.1 g (51%) of dimethyl 2-(4-tert-butoxycarbonylpiperazin-1-yl)-2-[(4-but-2-ynyloxybenzenesulfonylamino)methyl]malonate are obtained in the form of a white solid.

Provenance & Evidence