反应详情

To a stirred and cooled (0° C.) solution of crude 13 (2.77 g, 10.6 mmol) in EtOH (100 mL) was added NaBH4 (0.48 mg, 12.7 mmol) in a single portion. The mixture was allowed to warm to r.t. After 20 h the mixture was concentrated and partitioned between CH2Cl2-brine. The organic layer was dried (MgSO4) and concentrated. The residue was purified by SGC with CH2Cl2:MeOH as eluent (gradient up to 5% MeOH) to afford alcohol 14 (0.67 g, 24%). 1H NMR (400 MHz; CDCl3) δ 0.31 (s, 6H), 0.94 (s, 9H), 2.97 (t, J=8.2 Hz, 2H), 3.65 (t, J=8.2 Hz, 2H), 4.39 (s, 2H), 7.19 (s, 1H), 7.69 (s, 1H).

1. concentrationAfter 20 h the mixture was concentrated
2. custompartitioned between CH2Cl2-brine
3. dry with materialThe organic layer was dried (MgSO4)
4. concentrationconcentrated
5. customThe residue was purified by SGC with CH2Cl2