Water → N-Cyclopropyl-4-oxazol-5-yl-N-[1-(3,3,3-trifluoro-propyl)-piperidin-4-yl]-benzamide

Participants

Reaction Steps

A mixture of N-cyclopropyl-N-[1-(2-hydroxy-2-methyl-propyl)-piperidin-4-yl]-4-oxazol-5-yl-benzamide (80 mg), 1-iodo-3,3,3-trifluoropropane (108 mg), and K2CO3 (63 mg) in N-methyl-2-pyrrolidone (2 mL) is stirred at room temperature for 4 h and then at 60° C. over night. Since conversion of starting material is still incomplete, K2CO3 (63 mg) and two portions of 1-iodo-3,3,3-trifluoropropane (54 mg each) are added while stirring the reaction mixture for two more days at 80° C. Water is added to the reaction mixture and the aqueous phase is extracted with ethyl acetate. The combined extracts are washed with brine dried over MgSO4 and concentrated in vacuo. The residue is chromatographed on silica gel (cyclohexane/ethyl acetate 75:25→50:50). The crude product is triturated with diethyl ether, filtered off, and dried to give the title compound. LC (method 3): tR=1.08 min; Mass spectrum (ESI+): m/z=408 [M+H]+.

Provenance & Evidence