反应详情

Compound 2 (1.26 g, 5.08 mmol), 2-(tritylamino)ethanol (2.00 g, 6.60 mmol) and triphenylphosphine (1.80 g, 6.86 mmol) were dissolved in 51 mL of anhydrous THF, and stirred at room temperature for 5 min. DIAD (1.3 mL, 6.60 mmol) was added to the reaction mixture and then stirred overnight at 45° C. The reaction mixture was diluted with ethyl acetate and washed with sat'd NH4Cl aqueous solution. The organic layer was collected, dried over anhydrous Na2SO4, filtered, concentrated and purified by silica column chromatography (30% ethyl acetate in hexanes) to afford 3 (75.0%, 2.71 g) as a white solid.

1. stirringstirred overnight at 45° C
2. washwashed with sat'd NH4Cl aqueous solution
3. customThe organic layer was collected
4. dry with materialdried over anhydrous Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified by silica column chromatography (30% ethyl acetate in hexanes)