反应详情

To a suspension of 21 (20.0 g, 0.0735 mol; see Example 46) in 700 mL of anhydrous acetonitrile and 30 mL of anhydrous N,N-dimethylformamide was added anhydrous, powdered K2CO3 (12.68 g, 0.0918 mol) followed by benzyl bromide (13.81 g, 0.0808 mol, 9.61 mL). The mixture was stirred and vigorously refluxed for 6 hrs, cooled, filtered, and evaporated. The residue was purified by flash chromatography on silica gel eluting with a gradient system of 40 to 50% ethyl acetate/hexane to afford 25.50 g (96% yield) of product 40 as a pale yellow oil; TLC (silica gel; ethyl acetate/hexane: 1,1): Rf=0.35.

1. additionwas added anhydrous
2. temperaturevigorously refluxed for 6 hrs
3. temperaturecooled
4. filtrationfiltered
5. customevaporated
6. customThe residue was purified by flash chromatography on silica gel eluting with a gradient system of 40 to 50% ethyl acetate/hexane