1-Hydroxybenzotriazole → Tert-butyl 4-(3-chloro-2-fluorobenzoyl)piperazine-1-carboxylate

Participants

Reaction Steps

A mixture of 19.4 g of 1-Boc-piperazine, 24.0 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 19.1 g of 1-hydroxybenzotriazole, 20.0 g of 3-chloro-2-fluorobenzoic acid and 200 ml of chloroform was stirred at room temperature for 4 hours. The resulting mixture was diluted with chloroform, and an insoluble matter was filtered off using Celite. Then, the filtrate was washed with water and brine. The resulting organic layer was dried over magnesium sulfate and filtered, and the filtrate was concentrated in vacuo. The resulting residue was purified by a silica gel column chromatography (eluent: hexane/ethyl acetate=9/1 to 1/1) to give title compound.

Provenance & Evidence