反应详情

A solution of 7 (100 g, 0.4 mol) in DMF (600 mL) was treated with NaH (110 g, 3.2 mol, 70% dispersed by mineral oil) at 0° C. for 30 min, followed by the addition of BnBr (410 g, 2.4 mol) dropwise. After kept additional 2 hours at room temperature, the mixture was poured into ice-water (1.5 kg) slowly and extracted with ethyl acetate (3×500 mL). The organic layers were combined, washed with brine (3×300 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure to give a residue, which was purified by a silica gel column, eluted with 10%-30% ethyl acetate in petroleum ether to afford 92 (166 g, 80%) as a yellow oil; (ES, m/z) [M+H]+ 519.0; 1H NMR (300 MHz, CDCl3) δ 7.26-7.48 (m, 15H), 6.40 (d, J=6.6 Hz, 1H), 4.54-4.86 (m, 6H), 4.41 (d, J=4.8 Hz, 1H), 4.17-4.18 (m, 1H), 3.60-3.79 (m, 4H), 3.12 (s, 6H).

1. extractionextracted with ethyl acetate (3×500 mL)
2. washwashed with brine (3×300 mL)
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customto give a residue, which
6. customwas purified by a silica gel column
7. washeluted with 10%-30% ethyl acetate in petroleum ether