Dabco → 1-(4-Fluorophenyl)-2-oxo-6-(trifluoromethyl)-1,2-dihydropyridine-3-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-cyano-N-(4-fluorophenyl)acetamide (2 g, 11.2 mmol) and (3E)-4-ethoxy-1,1,1-trifluorobut-3-en-2-one (2.26 g, 13.4 mmol) in dimethyleneglycol monomethylether (20 mL) was added 1,4-diazabicyclo[2.2.2]octane (1.26 g, 11.2 mmol), and the mixture was stirred at 120° C. for 6 hr. The reaction mixture was diluted with 1N hydrochloric acid and ethyl acetate, and the mixture was extracted 3 times with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and filtered. The solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (NH silica gel, ethyl acetate/hexane=1/2→1/1) to give a white solid. The white solid was washed with ethyl acetate and collected by filtration to give the title compound (230 mg, 7.2%) as a white solid.

Provenance & Evidence