反应详情

To a solution of (S)-tert-butyl 4-((R)-2-(hydroxymethyl)pent-4-enyl)-2,2-dimethyloxazolidine-3-carboxylate (11.5 g, 38.4 mmol), imidazole (7.84 g, 115.2 mmol) and DMAP (234 mg, 1.92 mmol) in CH2Cl2 (200 mL) was added a solution of TBSCl (8.68 g, 57.6 mmol) in CH2Cl2 (100 mL) dropwise. The reaction mixture was stirred at rt for overnight. Water (100 mL) was added and the aqueous layer was extracted with CH2Cl2 (3×100 mL). The combined organic layers was washed with brine (70 mL), then dried over Na2SO4, filtered and concentrated to give the crude product, which was purified by column chromatography to afford (S)-tert-butyl 4-((R)-2-((tert-butyldimethylsilyloxy)methyl)pent-4-enyl)-2,2-dimethyloxazolidine-3-carboxylate (9 g, 57%).

1. extractionthe aqueous layer was extracted with CH2Cl2 (3×100 mL)
2. washThe combined organic layers was washed with brine (70 mL)
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated
6. customto give the crude product, which
7. customwas purified by column chromatography