反应详情

A solution of (3S,4S)-N-[(tertbutyloxy)carbonyl]-4-amino-3-hydroxy-5-phenyl pentene [prepared by the method of Hanson et al, J. Org. Chem., 50, 5399 (1985)] (10.0 g, 64.5 mmol), imidazole (9.14g, 13 mmol), and chlorotriisopropylsilane (12.44 g, 43.3 mmol) in anhydrous DMF (40 mL) was stirred for 5 days at room temperature under an N2 atmosphere. The solution was poured into H2O (500 mL) and extracted with Et2O (2×25 mL). The combined organic layers were washed with H2O (250 mL), a 0.5M citric acid solution (2×120 mL), a 5% KHCO3 solution (2×100 mL), and brine (2×100 mL). After the organic layer was dried over MgSO4, the filtrate was concentrated and purified by medium pressure column chromatography (silica gel, 10% ethyl acetate in hexane, Rf 0.23) to give 12.9 g (82 % yield) of the title compound as a clear, colorless oil. 1H and 13C NMR spectral data were consistent with the proposed structure.

1. extractionextracted with Et2O (2×25 mL)
2. washThe combined organic layers were washed with H2O (250 mL)
3. dry with materialAfter the organic layer was dried over MgSO4
4. concentrationthe filtrate was concentrated
5. custompurified by medium pressure column chromatography (silica gel, 10% ethyl acetate in hexane, Rf 0.23)