Dimethylformamide → Ethyl (2E)-3-{4-[(3-fluoro-4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-propenoate

Participants

Reaction Conditions

Reaction Steps

To a round-bottomed flask were added 4-[(4-bromophenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]-2-fluorophenol (136) (0.40 g, 0.95 mmol), ethyl acrylate (1.05 mL, 9.54 mmol), dichlorobis(triphenylphosphine)palladium(II) (0.067 g, 0.10 mmol), Et3N (0.70 mL, 4.77 mmol) and DMF (12 mL). The stirred reaction mixture was heated overnight at 100° C. under a nitrogen atmosphere. The reaction mixture was allowed to cool to room temperature and transferred to a separatory funnel with the aid of water and EtOAc (100 mL). The layers were separated and the organic phase was washed with water, brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give brown oil. The crude product was purified by chromatography on a silica gel column eluted with a gradient from hexanes to 20% EtOAc:hexanes to give 0.31 g (74%) of the title compound 137 as a light yellow foam. 1H NMR (400 MHz, CDCl3): δ 1.21 (s, 6H), 1.23 (s, 6H), 1.33 (t, J=7.1 Hz, 3H), 2.22 (s, 2H), 2.24 (s, 2H), 4.26 (q, J=7.1 Hz, 2H), 5.44 (br s, 1H), 6.40 (d, J=15.9 Hz, 1H), 6.80-6.90 (m, 2H), 6.93 (t, J=8.5 Hz, 1H), 7.17 (d, J=8.1 Hz, 2H), 7.46 (d, J=8.3 Hz, 2H), 7.65 (d, J=15.9 Hz, 1H). LCMS (ES): m/z, 439 (M+H)+, 437 (M−H)−.

Provenance & Evidence