反应详情

TBS-Cl (1291 mg, 4.28 mmol) was added to a solution of 2A (860 mg, 2.86 mmol) and imidazole (389 mg, 5.71 mmol) in dichloromethane (20 mL) and stirred overnight at rt. The reaction was diluted with EtOAc, washed with water and brine, dried over Na2SO4 and concentrated. The crude product was purified by flash chromatography (loading in chloroform, 0% to 50% ethyl acetate in hexane over 15 min using a 40 g silica gel cartridge) to yield 2B (830 mg, 1.998 mmol, 70.0% yield) as a clear oil. 1H NMR (500 MHz, chloroform-d) δ ppm 7.15 (2H, s), 4.28-4.36 (1H, m), 3.68 (3H, s), 2.82 (2H, ddd, J=53.09, 13.89, 7.02 Hz), 2.53 (2H, ddd, J=57.43, 15.06, 6.19 Hz), 2.33 (6H, s), 0.80 (9H, s), −0.10 (3H, s), −0.32 (3H, s).

1. washwashed with water and brine
2. dry with materialdried over Na2SO4
3. concentrationconcentrated
4. customThe crude product was purified by flash chromatography (loading in chloroform
5. wait0% to 50% ethyl acetate in hexane over 15 min using