反应详情

To a solution of 2-(t-hexyldimethylsiloxy)indene (35.58 g, 129.6 mmol) in Et2O (120 mL) at 0° C. was added dropwise n-BuLi (52.4 mL of a 2.5 M solution in hexane, 130.9 mmol) and the reaction mixture was stirred overnight at room temperature. The resulting solution was then added dropwise to a solution of dimethyldichlorosilane (7.9 mL, 64.8 mmol) in Et2O (50 mL) at 0° C. The reaction mixture was stirred overnight at room temperature and washed with saturated ammonium chloride solution (300 mL), water (2×200 mL) and dried over sodium sulfate. Evaporation of the solvents left a red oil that was dissolved in a 4:1 mixture of MeOH and acetone. Concentration and cooling to −30° C. gave 11.67 g (29.7%) of the title compound as a white powder. The crystalline first crop consisted exclusively of the racemic diastereomer. EIMS (calcd/found): m/e 604.3588/604.3585. 1H NMR (CDCl3, δ): 7.22-7.13 (m, 6H); 6.98 (td, 3J=7.3 Hz, 4J=1.4 Hz, 2H); 5.85 (s, 2H); 3.99 (s, 2H); 1.72 (sept, 3J=6.9 Hz, 2H); 0.94 (s, 6H); 0.94 (s, 6H); 0.90 (d, 3J=6.9 Hz, 6H); 0.89 (d, 3J=6.9 Hz, 6H); 0.38 (s, 6H); 0.34 (s, 6H); −0.23 (s, 6H). 13C NNR (CDCl3, δ): 164.87; 144.49; 137.53; 125.13; 122.86; 121.38; 118.84; 104.26; 43.15; 33.76; 25.19; 20.17; 20.08; 18.54; 18.45; −2.30; −2.75; −6.73. The oily residue was washed with cold MeOH (3×100 mL) and dried in vacuo to yield 14.02 g (35.8%) of the fairly pure meso diastereomer as a red oil (total yield 65.5%).

1. stirringThe reaction mixture was stirred overnight at room temperature
2. washwashed with saturated ammonium chloride solution (300 mL), water (2×200 mL)
3. dry with materialdried over sodium sulfate
4. customEvaporation of the solvents
5. waitleft a red oil that
6. dissolutionwas dissolved in a 4:1 mixture of MeOH and acetone
7. concentrationConcentration
8. temperaturecooling to −30° C.