Toluene → N-Cyclopropyl-6-iodo-4-(trifluoromethyl)nicotinamide

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Reaction Steps

Cyclopropylamine (862 mg, 15.1 mmol) was dissolved in 4 ml of dichloromethane and admixed dropwise under argon with a solution of trimethylaluminium in toluene (2 M, 7.55 ml, 15.1 mmol). The mixture was stirred for 30 min, and then methyl 6-iodo-4-(trifluoromethyl)nicotinate (500 mg, 1.51 mmol) (synthesis analogous to J. Med. Chem., 2008, 51, 3133-3144 by esterification of nicotinic acid) dissolved in 3 ml of dichloromethane was added dropwise. The mixture was heated under reflux overnight and, after cooling to room temperature, water was added cautiously. The mixture was extracted with ethyl acetate, the organic phase washed with potassium sodium tartrate solution, dried over magnesium sulphate and filtered, and the filtrate concentrated under reduced pressure. The purification was effected by means of silica gel chromatography with the eluent cyclohexane/ethyl acetate (EA) (0% EA to 30% EA).

Provenance & Evidence