2-(Dimethylamino)ethanol → (6-Chloro-3-cyclopropylpyridin-2-yl)(2-fluoropyridin-3-yl)methanone

Participants

Reaction Conditions

Reaction Steps

A 2.5M solution of nBuLi (10.94 ml, 27.34 mmol) was added to a solution of 2-(dimethylamino)ethanol (1.37 ml, 13.67 mmol) in hexane (15 ml) cooled to −78° C. The reaction mixture was stirred at −78° C. for 30 minutes then, a solution of 2-chloro-5-cyclopropylpyridine (700 mg, 4.56 mmol) in hexane (10 mL) was added dropwise. The reaction mixture was stirred for 90 minutes. A solution of 2-fluoro-N-methoxy-N-methylnicotinamide (3.36 g, 18.23 mmol) in tetrahydrofuran (15 mL) was added dropwise and the reaction mixture was stirred at −78° C. for 1 hour. The reaction mixture was partitioned between a saturated solution of ammonium chloride and ethyl acetate. The organic extract was washed with a saturated solution of sodium bicarbonate and brine, dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified on silica gel by flash column chromatography to afford the title compound as a colourless oil (1.14 g, 61% yield).

Provenance & Evidence