反应详情

A solution of 4-bromo-2,2-dimethyl-5-(pyridin-4-yl)furan-3(2H)-one (10.0 g, 37.2 mmol), 2-(4-(benzyloxy)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (13.8 g, 44.7 mmol), and Cs2CO3 (36.27 g, 111.6 mmol) in toluene (100 mL) and water (50 mL) was degassed. Dichloro[1,1′-bis(diphenylphosphino)ferrocene]palladium(II) (2.7 g, 3.7 mmol) was added under an inert atmosphere and again degassed. Then the reaction was refluxed for 3 h and monitored by TLC. Upon complete consumption of the starting material, the reaction mixture was filtered through a bed of Celite® washing with ethyl acetate. The organic layer was then washed with water, brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by flash column chromatography using 20% ethyl acetate in n-hexanes on 230-400 mesh silica gel to afford 4-(4-(benzyloxy)phenyl)-2,2-dimethyl-5-(pyridin-4-yl)furan-3(2H)-one (8.3 g, 60.2%) as a light orange color solid. 1H NMR, 500 MHz, DMSO-d6: δ 8.2 (d, 2H), 7.85 (d, 2H), 7.6 (d, 4H), 7.4 (t, 1H), 7.15 (d, 2H), 7.05 (d, 2H), 5.1 (s, 2H), 1.45 (s, 6H). MS: [M+H]+: m/z=396.0. HPLC: (97.5%, Column: Eclipse XDB-C18, 150×4.6 mm, 5 um. Mobile Phase: 0.1% TFA in Water. (A). ACN (B), Flow rate: 1.5 ml/min).

1. customagain degassed
2. temperatureThen the reaction was refluxed for 3 h
3. customUpon complete consumption of the starting material
4. filtrationthe reaction mixture was filtered through a bed of Celite®
5. washwashing with ethyl acetate
6. washThe organic layer was then washed with water, brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. customThe residue was purified by flash column chromatography