反应详情

A solution of Trityl chloride (500 mg; 1.81 mmol), TEA (0.277 ml; 1.99 mmol) and DMAP (8.8 mg; 0.072 mmol) in dry DCM (5 ml) was added with a syringe to a solution of the diol (10) (800 mg; 9.07 mmol) in DCM (15 ml). The mixture was stirred at room temperature for 1 hour and 30 minutes, then other TrCl, TEA and DMAP (half quantities than before) were added. The reaction was stirred at the same temperature until TLC (Hexane/EtOAc 50:50) showed complete disappearance of Trityl chloride. After 1.5 hours water (20 ml) was added and the reaction was stirred for few minutes, then the phases were separated. The organic layer was washed with water (25 ml) and brine (25 ml). The solvent was dried over MgSO4 and evaporated to afford a crude oil which was purified by flash chromatography using Hexane/EtOAc 50:50 as eluent which gave the title compound as a colourless oil, 637 mg, 71%. Rf: 0.72 in Hexane/EtOAc 50:50 (UV/PMA).

1. stirringthe reaction was stirred for few minutes
2. customthe phases were separated
3. washThe organic layer was washed with water (25 ml) and brine (25 ml)
4. dry with materialThe solvent was dried over MgSO4
5. customevaporated
6. customto afford a crude oil which
7. customwas purified by flash chromatography