2-(4-Fluorophenyl)-N-methoxy-N-methylacetamide → 1-(4-Fluorophenyl)but-3-en-2-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 220 mL (1.0 M, 220mmol) of vinylmagnesium bromide in 100 mL THF, was added dropwise under nitrogen atmosphere at 0 ° C. a solution of 21 g (106.6 mmol) 2-(4-fluorophenyl)-N-methoxy-N-methylacetamide (step A) in ˜150 mL dry ether. The reaction mixture was stirred at 0° C. for 0.5 hr then poured slowly into an ice/2N aq HCl mixture. The resulting mixture was diluted with ether and brine, transferred to a separatory funnel and the organic layer separated. The organic layer was washed with brine, dried over drying agent, filtered and the solvent evaporated under vacuum to give 14.2 g of the crude title compound which was used without further purification. 1H-NMR (CDCl3): δ: 7.19 (2H, m), 7.02 (2H, t, J=9.5 Hz), 6.42 (1H, dd, J1=14.2Hz, J2=11Hz). 6.34 (1H, d, J=14.2Hz), 5.86 (1H, d, J=11 Hz), 3.87 (2H, s).

Provenance & Evidence