Acetonitrile → 2-(4-Trifluoromethyl-phenyl)-4-(4-trifluoromethyl-piperidin-1-ylmethyl)-thiazole-5-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 107.7 g of 4-trifluoromethyl piperidine hydrochloride in 450 mL of water were added 2.7 L of acetonitrile, 224 g of 4-bromomethyl-2-(4-trifluoromethyl-phenyl)-thiazole-5-carboxylic acid ethyl ester and 157 g of potassium carbonate. The resulting mixture was heated to 40° C. for 2 h, allowed to cool to room temperature then concentrated under reduced pressure. The residue was taken into 2 L of dichloromethane then washed twice with 500 mL of water. The organic layer was dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by column chromatography on silica gel (gradient of dichloromethane/ethanol from 100/0 to 90/10) followed by washing of the collected solid with diisopropyl ether to give 212 g of 2-(4-trifluoromethyl-phenyl)-4-(4-trifluoromethyl-piperidin-1-ylmethyl)-thiazole-5-carboxylic acid ethyl ester as a white solid.

Provenance & Evidence