反应详情

To a suspension of 4.5 g (18.4 mmol) of 6 and 4.1 g (30 mmol) of K2CO3 in 150 ml of acetone under Ar was added 3.4 g (20 mmol) of BnBr. The mixture was heated at reflux for 15 h, concentrated, then diluted with 100 ml of CH2Cl2, washed (water, 1 N HCl, and brine), and dried (Na2SO4). Concentration and chromatography (EtOAc/hexane) afforded 5.2 g (84%) of 7 (white solid): 1H NMR (300 MHz, CDCl3) δ 1.39 (t, J=7.2 Hz, 3 H), 4.37 (q, J=7.2 Hz, 2 H), 5.21 (s, 2 H), 7.39 (m, 3 H), 7.50 (in, 3 H), 7.63 ppm (m, 2 H).

1. temperatureThe mixture was heated
2. temperatureat reflux for 15 h
3. concentrationconcentrated
4. additiondiluted with 100 ml of CH2Cl2
5. washwashed (water, 1 N HCl, and brine)
6. dry with materialdried (Na2SO4)
7. concentrationConcentration and chromatography (EtOAc/hexane)