反应详情

The alcohol 255C (1.00 g, 3.7 mmol) in 12 mL of THF was treated with 60% NaH (177.8 mg, 4.44 mmol), benzyl bromide (0.53 mL, 4.44 mmol) and tetrabutylammonium iodide (50 mg, 5%) for 3 h at rt. Water was added and the mixture was extracted with EtOAc (3×). The combined extracts were washed with water (1×) and brine (1×) and dried over Na2SO4. Purification by flash chromatography on silica gel eluting with 20% hexane/80% CH2Cl2 gave 1.10 g (3.05 mmol, 82.6%) of compound 255D as a yellow oil.

1. extractionthe mixture was extracted with EtOAc (3×)
2. washThe combined extracts were washed with water (1×) and brine (1×)
3. dry with materialdried over Na2SO4
4. customPurification by flash chromatography on silica gel eluting with 20% hexane/80% CH2Cl2