反应详情

(R)-(−)-1-(tert-Butyldimethylsilanyloxy)-3-chloropropan-2-ol (11.19 g) prepared in reference example 31 was dissolved in dichloromethane (20 ml), then 3,4-dihydro-2H-pyran (5.87 ml) and pyridinium p-toluenesulfonate (catalytic amount) were added, then the reaction mixture was stirred at a room temperature overnight. The reaction mixture was concentrated under a reduced pressure, the residue was purified by use of a silica gel column chromatography (eluent: n-hexane/ethyl acetate=20/1), there was obtained 1-(t-butyldimethylsilanyloxy)-3-chloro-2-(tetrahydropyran-2-yloxy)propane (14.14 g, yield: 92.0%) as colorless liquid product.

1. concentrationThe reaction mixture was concentrated under a reduced pressure
2. customthe residue was purified by use of a silica gel column chromatography (eluent: n-hexane/ethyl acetate=20/1)