Triethylamine → HCID 131724192, compound

Participants

Reaction Steps

Rac-cis-4-[1-Benzyl-3-(4-chloro-phenyl)-piperidin-4-yl]-piperazine-1-carboxylic acid 9H-fluoren-9-ylmethyl ester (1.68 g, 2.84 mmol) was dissolved in toluene (60 mL) and 1-chloroethyl-chloroformate (0.348 mL, 3.13 mmol) were added. The reaction mixture was refluxed overnight. Methanol (55 mL) was added and reflux was continued for 4 h. The solvents were evaporated. The crude intermediate was dissolved in dichloromethane (50 mL) and triethylamine (1.99 mL, 14.2 mmol) and 3,5-bistrifluoromethyl-benzoyl chloride (0.643 mL, 3.55 mmol) were added. The reaction mixture was stirred at room temperature overnight and than diluted with 50 mL water. The organic phase was separated and the aqueous layer was extracted twice with 50 mL dichloromethane. Organic phases were pooled, dried with magnesium sulfate and evaporated. Flash chromatography on silica gel with cyclohexane/ethyl acetate 1:1 gave rac-cis-4-[1-(3,5-bis-trifluoromethyl-benzoyl)-3-(4-chloro-phenyl)-piperidin-4-yl]-piperazine-1-carboxylic acid 9H-fluoren-9-ylmethyl ester (1.84 g, 87%) as an off-white solid, MS: m/e=742.3 (M+H+).

Provenance & Evidence