反应详情

Method A; To a suspension of 4 (1.39 g, 2.93 mmol) in MeOH (4 ml) was added a solution of 3N HCl in AcOEt (10 ml) under ice cooling, and the mixture was stirred at room temperature for 2 h. A solution of NaHCO3 (2.8 g) in H2O was poured into the reaction mixture under ice cooling, and the whole was extracted with AcOEt and a little MeOH. The organic layer was washed with brine, dried over Na2SO4, and then concentrated. The residual solid was triturated with Et2O to give 5 (91%). 5: colorless powder; 1H-NMR (CD3OD) δ 0.97 (3H, t, J=7.4 Hz), 2.38 (6H, s), 2.65 (2H, q, J=7.4 Hz), 2.82 (2H, t, J=5.4 Hz), 4.11 (2H, t, J=5.74 Hz), 6.50 (2H, d, J=8.8 Hz), 6.92 (2H, d, J=8.8 Hz), 6.94 (2H, d, J=9.2 Hz) 7.11-7.25 (5H, m), 7.53 (2H, d, J=9.1 Hz). 13C-NMR (CD3OD) δ 13.21, 30.40, 45.76, 59.09, 66.74, 115.69, 115.75, 123.42, 127.91, 129.10, 129.31, 130.42, 131 0.78,

1. extractionthe whole was extracted with AcOEt
2. washThe organic layer was washed with brine
3. dry with materialdried over Na2SO4
4. concentrationconcentrated
5. customThe residual solid was triturated with Et2O