Reaktion #5399

Reaktionsgleichung

trans-4-(4'-cyano-4-biphenylyl)cyclohexanol

3,4-dihydro-2H-pyran

bistrimethylsilyl sulfate

→

trans-4-(4'-cyano-4-biphenylyl)cyclohexyl tetrahydropyranyl ether

Lösungsmittel

dichloromethane

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Waschenwashed once with sodium carbonate solution and twice with water
2. 2
   Trocknensubsequently dried over magnesium sulfate
3. 3
   Filtrationfiltered
4. 4
   Einengenconcentrated
5. 5
   SonstigeThe crude product was purified by chromatography on silica gel with toluene/ethyl acetate (vol. 9:1)
6. 6
   SonstigeRecrystallization from ethyl acetate at -20° C.

Vorschrift

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.

Quelle