反应详情

2-Hydroxy-5-(4-fluorophenyl)-tetrahydrofuran (550 mg, 3.0 mmol), t-butyldimethylsilyl chloride (498 mg, 3.3 mmol) and imidazole (450 mg, 6.6 mmol) were dissolved in 2 mL of dry DMF. This solution was stirred under dry argon overnight, poured into 200 mL of water and extracted with a 2:1 mixture of ethyl acetate and hexane (3×100 mL). The combined organic extracts were washed with water (4×200 mL) and brine (100 mL), dried over sodium sulfate and evaporated to give 830 mg (93%) of 2-(t-butyldimethylsilyloxy)-5-(4-fluorophenyl) tetrahydrofuran (202, mixture of cis and trans isomers) as a colorless oil, which did not need any purification. 1H-NMR (CDCl3) δ 7.40-7.50(2H, m, minor isomer), 7.25-7.35 (2H, m, major isomer), 7.00-7.10(2H, m, both major and minor isomers), 5.71-5.75 (1H, m, major isomer), 5.59-5.62 (1H, m, minor isomer), 5.12-5.20 (1H, m, major isomer), 4.90-4.98 (1H, m, minor isomer), 2.40-2.55 (1H, m, both major and minor isomers), 2.05-2.17 (1H, m, both major and minor isomers), 1.87-2.00 (1H, m, both major and minor isomers), 1.67-1.70 (1H, m, both major and minor isomers), 0.92 (s, 9H, both major and minor isomers), 0.16 (s, 6H, both major and minor isomers).

1. extractionextracted with a 2:1 mixture of ethyl acetate and hexane (3×100 mL)
2. washThe combined organic extracts were washed with water (4×200 mL) and brine (100 mL)
3. dry with materialdried over sodium sulfate
4. customevaporated