反应详情

温度

60 °C

To a stirred suspension at room temperature of VIII (150 mg, 0.46 mmol) in anhydrous CH2Cl2 (10 ml) under nitrogen were added Et3N (194 μl, 1.39 mmol) and 3,4,5-trimethoxyaniline (94 mg, 0.51 mmol) or ArNH2(1.1–1.2 equiv.), respectively. The reaction mixture was heated to 60° C. After 20 h, the reaction mixture was concentrated, diluted with AcOEt, and successively washed with a saturated aqueous solution of NH4Cl, H2O and brine, dried over MgSO4, filtered and concentrated. The crude product was purified by flash chromatography on silica gel (AcOEt/CH2Cl2:15/85→20/80) to give the title product IXa (130 mg, 0.35 mmol, 75% yield) as a yellow solid. 1H NMR (300 MHz, acetone-d6) δ(ppm): 9.42 (bs, 1H), AB system (δA=8.09, δB=7.78, J=8.1 Hz, 4H), 7.75 (d, J=15.6 Hz, 1H), 7.21 (s, 2H), 7.00 (d, J=15.8 Hz, 1H), 3.94 (s, 3H), 3.85 (s, 6H), 3.73 (s, 3H).

1. concentrationthe reaction mixture was concentrated
2. additiondiluted with AcOEt
3. washsuccessively washed with a saturated aqueous solution of NH4Cl, H2O and brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude product was purified by flash chromatography on silica gel (AcOEt/CH2Cl2:15/85→20/80)