反应详情

To a solution of 8 (6.0 g, 30 mmol) in THF (100 mL) at 0° C. was added n-BuLi (1.6 M in hexanes, 21 mL, 33 mmol). The solution turned dark red during the addition. After stirring at the same temperature for an additional 2 h, chlorotrimethylsilane (4.2 mL, 33 mmol) was added dropwise to the reaction mixture. The reaction was warmed to room temperature and allowed to stir for an additional 1 h. The resulting bright yellow slurry was partitioned between EtOAc (200 mL) and H2O (100 mL). The organic layer was washed with brine (100 mL), dried over NaSO4, and concentrated. The crude product was purified by flash column chromatography (EtOAc/hexanes, 1:19-1:9) to give 9 (7.7 g, 28.5 mmol, 95%) as a pale yellow oil: 1H NMR (500 MHz, CDCl3) δ 0.10 (s, 9H), 2.13 (s, 6H), 2.39 (s, 3H), 2.41 (s, 3H), 5.89 (s, 2H), 6.78 (s, 1H), 6.85 (s, 1H); 13C NMR (125 MHz, CDCl3) δ−1.5, 13.1, 20.9, 29.8, 106.2, 118.7, 121.9, 128.3, 148.8, 151.5, 161.4; LCQ-MS (M+H+) calcd for C16H25N2Si 273. found 273; LC-TOF-MS (M+H+) calcd for C16H25N2Si 273.17870. found 273.17735.

1. additionThe solution turned dark red during the addition
2. stirringto stir for an additional 1 h
3. customThe resulting bright yellow slurry was partitioned between EtOAc (200 mL) and H2O (100 mL)
4. washThe organic layer was washed with brine (100 mL)
5. dry with materialdried over NaSO4
6. concentrationconcentrated
7. customThe crude product was purified by flash column chromatography (EtOAc/hexanes, 1:19-1:9)