反应详情

2.34 g of 1-[2-(4-chlorophenyl)ethyl]piperazine and 1.57 g of Hunig base (=N-ethyldiisopropylamine) are introduced into 40 ml of tetrahydrofuran. 2.36 g of 4-chloroacetylaminobenzoic acid chloride [see J. Med. Chem. 28 (1985) 910] are added thereto in small portions. After 30 minutes at 40°, the solution is concentrated by evaporation. The residue is chromatographed over silica gel, and recrystallisation is carried out from acetone, yielding 1-(4-chloroacetylaminobenzoyl)-4-[2-(4-chlorophenyl)ethyl]piperazine having a melting point of 146°-147°.

1. concentrationthe solution is concentrated by evaporation
2. customThe residue is chromatographed over silica gel, and recrystallisation