Piperazin-2-one → [4,5-Bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-(piperazin-2-one-4-yl-methyl)-piperidin-1-yl]-methanone

Participants

Reaction Conditions

Reaction Steps

Piperazine-2-one (21 mg, 0.21 mmol) was added to a solution [4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-bromomethyl-piperidin-1-yl]-methanone (48 mg, 0.07 mmol) in anhydrous dimethylformamide (2.0 mL). The mixture was stirred overnight at 70° C. The reaction mixture was cooled to ambient temperature and partitioned between methylene chloride and a saturated aqueous solution of ammonium chloride. The aqueous phase was extracted with methylene chloride and the combined organic extracts were washed with brine, and dried over anhydrous sodium sulfate. Evaporation of the solvents and chromatography of the residue over silica gel using 1-5% methanol in methylene chloride gave [4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-(piperazin-2-one-4-yl-methyl)-piperidin-1-yl]-methanone, which was dissolved in dilute hydrochloric acid (0.5 N, 1 mL) and lyophilized to give [4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-(piperazin-2-one-4-yl-methyl)-piperidin-1-yl]-methanone hydrochloride as an off-white powder (23 mg, 45%). LR-MS (APCI): 702.4 [(M+H)+].

Provenance & Evidence