4-Chlorobenzoyl chloride → HCID 15614760, compound

Participants

Reaction Steps

A suspension of 1,3-dihydro-5-(2-fluorophenyl)-3-hydroxy-2H-1,4-benzodiazepin-2-one (610 mg, 2.25 mmole) in 25 ml of methylene chloride was treated with 4-chlorobenzoyl chloride (0.314 ml, 2.48 mmole) at room temperature. 4-Dimethylaminopyridine (303 mg, 2.48 mmole) was added and within minutes the reaction mixture became homogeneous. The reaction mixture was protected from moisture and stirred at room temperature overnight. An additional equivalent each of 4-chlorobenzoyl chloride and 4-dimethylaminopyridine were added and stirring was continued for 8 hours at 40°-45° C. The reaction mixture was diluted to 150 ml with methylene chloride and washed in succession with 10% citric acid solution (3×50 ml), saturated sodium bicarbonate solution (3×50 ml) and brine (50 ml). Rotoevaporation of the dried (MgSO4) organic phase gave a foam which on trituration with ether afforded a beige solid. Recrystallization from ethyl acetate afforded 612 mg of the title compound as a white powder in analytical purity: m.p. 198°-199° C.

Provenance & Evidence