反应详情

A solution of N2-(tert-butoxycarbonyl)-N-methoxy-N-methyl-D-serinamide (1, 1.93 g, 7.78 mmol) and imidazole (1.21 g, 17.81 mmol) in DMF (9 ml) stirred under N2 at room temperature, was treated with neat tert-butyl(chloro)diphenylsilane (2.2 ml, 8.56 mmol) and further stirred for 17 h. Diluted with EtOAc, washed with 5% KHSO4 in water, then sat NaHCO3, dried over Na2SO4, filtered and concentrated. Purified through a chromatographic cartridge of silicagel (50 g) eluted with 10% to 60% EtOAc in hexane to give 3.55 g (94% yield) of title compound as colorless oil. MS: m/z=509.2 (MNa+).

1. washwashed with 5% KHSO4 in water
2. dry with materialdried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated
5. customPurified through a chromatographic cartridge of silicagel (50 g)
6. washeluted with 10% to 60% EtOAc in hexane