4-Chlorobenzenesulfonyl chloride → 2-(4-chlorobenzenesulphonamido)-N-(3-imidazol-1-ylpropyl)benzamide

Participants

Reaction Steps

4-Chlorobenzenesulphonyl chloride (1.56 g) was added in portions over 2 minutes to a solution of 2-amino-N-(3-imidazol-1-ylpropyl)benzamide (1.8 g) in water (50 ml) at 80° C. on a steam bath. The mixture was stirred at 80°-90° C. for 3 hours, cooled to room temperature and brought to pH 7 with saturated aqueous sodium bicarbonate solution. The crude product which had precipitated was extracted into dichloromethane (2×100 ml); the resulting solution was dried over magnesium sulphate and evaporated to give a solid. The solid was recrystallised from ethanol to give 2-(4-chlorobenzenesulphonamido)-N-(3-imidazol-1-ylpropyl)benzamide (1.4 g), in the form of a white solid, m.p. 174°-176° C.

Provenance & Evidence