3,4-dihydro-2H-pyran → Ethyl 2,2-difluoro-3-tetrahydropyranyloxypropionate

Beteiligte Stoffe

Reaktionsschritte

Dihydropyrane (2 ml, 22 mmol) was added to a solution of ethyl 2,2-difluoro-3-hydroxypropionate (3.1 g, 20 mmol) and pyridinium p-toluene sulfonate (0.25 g, 1 mmol) in anhydrous dichloromethane (50 ml). The mixture was stirred overnight at room temperature and the desired compound ethyl 2,2-difluoro-3-tetrahydropyranyloxypropionate was obtained by flash chromatography on silica gel (ethyl acetate:hexane; 15:85) (4 g, 80%).

Herkunft & Nachweise