4-Chlorobenzoyl chloride → Methyl 4-[1-(4-chlorobenzoyl)-piperazin-4-ylmethyl]-benzoate

Participants

Reaction Steps

To a solution of 15.3 g. (50 mmole) methyl 4-(piperazin-1-ylmethyl)-benzoate and 175 ml. anhydrous pyridine, there is added dropwise, at 0°-5° C., 8.7 g. (50 mmole) 4-chlorobenzoyl chloride and the reaction mixture kept for a further hour at 0° to 5° C., then overnight at 20° C. The reaction mixture is stirred into ice water and the precipitated product is filtered off with suction, washed with water and dried to give 18.5 g. (quantitative) of the desired product; m.p. 134°-135° C.

Provenance & Evidence