反应详情

To a stirred solution of 6.16 g (30.2 mmol) 3 and 110 ml dichloromethane were added 50.0 g (302 mmol) methyltriflate (Aldrich) drop wisely. The reaction mixture was stirred over night and diethylether was added. After evaporation of one third of the solvent volume the desired compound precipitates and the rest of the solvent were decanted. The solid was washed extensively (ten times) with large amounts of diethylether. The solid was dried by use of oil pump vacuum and purified by (C-18) RP-column chromatography (acetonitril/water—gradient 1:99 to 80:20). The desired compound 4 was obtained in 69% yield (20.8 mmol, 7.68 g).

1. customAfter evaporation of one third of the solvent volume the desired compound
2. customprecipitates
3. customthe rest of the solvent were decanted
4. washThe solid was washed extensively (ten times) with large amounts of diethylether
5. customThe solid was dried by use of oil pump vacuum
6. custompurified by (C-18) RP-column chromatography (acetonitril/water—gradient 1:99 to 80:20)