N-methoxy-N-methyl-2-phenylamino-6-trifluoromethyl-nicotinamide → 1-(2-Phenylamino-6-trifluoromethyl-pyridin-3-yl)-ethanone

Participants

Reaction Conditions

Reaction Steps

A solution of N-methoxy-N-methyl-2-phenylamino-6-trifluoromethyl-nicotinamide (5.10 g, 15.7 mmol) in tetrahydrofuran (100 mL) cooled to 0° C. was treated with a solution of 3 M methylmagnesium chloride (15.7 mL, 47.0 mmol). The reaction was then stirred at 0° C. for 90 min. At this time, the reaction was warmed to 25° C. and was quenched with water (150 mL). The reaction was then partitioned between ethyl acetate (250 mL) and water (250 mL). The aqueous layer was back extracted with ethyl acetate (2×150 mL). The combined organics were washed with a saturated aqueous sodium chloride solution (50 mL), filtered, rinsed with ethyl acetate and concentrated in vacuo. Flash chromatography (20%-40% ethyl acetate/hexanes) afforded 1-(2-phenylamino-6-trifluoromethyl-pyridin-3-yl)-ethanone (4.28 g, 97.4%) as a yellow solid.

Provenance & Evidence