Chloride → 4-(3-Trifluoromethylphenyl)-1-cyclopropylcarbonyl-1,2,3,6-tetrahydropyridine

Participants

Reaction Steps

To a solution of 9.1 g of 4-(3-trifluoromethylphenyl)-1,2,3,6-tetrahydropyridine and of 4.04 g of triethylamine in 40 ml of methylene chloride cooled to 0° C., a solution of 4.2 g of chloride of cyclopropanecarboxylic acid in 20 ml of methylene chloride is added dropwise, while ensuring that the temperature does not exceed 5° C. The reaction mixture is left for 30 minutes at 0°-5° C., then for one hour at room temperature. 200 ml of diethyl ether are added, the mixture is filtered, the organic phase is washed three times with water, dried and evaporated to dryness under reduced pressure. Thus 11.5 g of 4-(3-trifluoromethylphenyl)-1-cyclopropylcarbonyl-1,2,3,6-tetrahydropyridine are obtained: yellow/brown oil containing traces of impurities.

Provenance & Evidence