反应详情

温度

0 °C

A solution of 3.0 g of trans-4-(4'-cyano-4-biphenylyl)cyclohexanol, 1.1 ml of 3,4-dihydro-2H-pyran in 30 ml of dichloromethane was treated at 0° C. with a solution of 0.007 g of bistrimethylsilyl sulfate in 2 ml of dichloromethane. The reaction mixture was stirred at 0° C. for a further 30 minutes and then washed once with sodium carbonate solution and twice with water and subsequently dried over magnesium sulfate, filtered and concentrated. The crude product was purified by chromatography on silica gel with toluene/ethyl acetate (vol. 9:1). Recrystallization from ethyl acetate at -20° C. gave 1.75 g of pure trans-4-(4'-cyano-4-biphenylyl)cyclohexyl tetrahydropyranyl ether.

1. washwashed once with sodium carbonate solution and twice with water
2. dry with materialsubsequently dried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated
5. customThe crude product was purified by chromatography on silica gel with toluene/ethyl acetate (vol. 9:1)
6. customRecrystallization from ethyl acetate at -20° C.