반응 #1245481

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(R)-(−)-1-(tert-Butyldimethylsilanyloxy)-3-chloropropan-2-ol

3,4-dihydro-2H-pyran

pyridinium p-toluenesulfonate

→

1-(t-butyldimethylsilanyloxy)-3-chloro-2-(tetrahydropyran-2-yloxy)propane

수율 92.0%

용매

dichloromethane

반응 조건

후처리

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

실험 절차

(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.

출처