Triethylamine → 1-(4-Cyanobenzoyl)-4-[1-(4-pyrimidinyl)piperidin-4-ylcarbonyl] piperazine

A solution of 4-cyanobenzoyl chloride (298 mg) in dichloromethane (10 ml) was added to a stirred mixture of 1-[1 (4-pyrimidinyl) piperidin-4-ylcarbonyl] piperazine (412.5 mg) and triethylamine (0.28 ml) in dichloromethane (15 ml) and the resultant mixture was stirred at ambient temperature for 2 hours. The mixture was partitioned between dichloromethane and water. The organic phase was washed with water, dried (Na2SO4) and evaporated. The residue was purified by column chromatography using 0.5 % methanol in dichloromethane. Recrystallisation from ethyl acetate/hexane gave, as a solid 1-(4-cyanobenzoyl)-4-[l-(4-pyrimidinyl)-4-piperidylcarbonyl]piperazine (280 mg), mp 192-193° C.;