反应详情

A solution of 1.27 mmol of titanium tetrachloride in 1.5 ml of dichloromethane is added to a solution of 2.61 mmol of trimethylsilyl trifluoromethanesulphonate in 1 ml of dichloromethane at 0° C. The mixture is stirred at room temperature for 4 hours and then cooled to 0° C. A solution of 0.83 mmol of 1-trityl-1H-imidazol-4-ylmethyl (tert-butyldimethylsilyloxy)(4-cyanophenyl)acetate and 4.17 mmol of triethylsilane in 2 ml of dichloromethane is added, and the reaction mixture is stirred at room temperature for 20 hours. The reaction mixture is poured into ice-water and extracted with ethyl acetate (2×). The combined organic phases are washed with water and brine; dried with sodium sulphate and evaporated. The title compound is identified from the residue on the basis of the Rf by flash chromatography (SiO2 60F).

1. temperaturecooled to 0° C
2. stirringthe reaction mixture is stirred at room temperature for 20 hours
3. extractionextracted with ethyl acetate (2×)
4. washThe combined organic phases are washed with water and brine
5. dry with materialdried with sodium sulphate
6. customevaporated