Sodium hydride → 2-(3-Cyano-3-(3,4-dichlorophenyl)propyl)oxytetrahydropyran

Participants

Reaction Steps

A solution of 100 g of 3,4-dichlorophenylacetonitrile in 500 ml of THF is added dropwise at 20° C. over 30 minutes to a suspension of 16.5 g of sodium hydride in 200 ml of dry THF, and the reaction mixture is then stirred at RT for 2 hours. It is cooled to -20° C., a solution of 118 g of 1-bromo-2-(tetrahydro-2-pyranyloxy)ethane in 100 ml of THF is added and the mixture is left stirring for 2 hours while allowing the temperature to rise to RT. A solution of 50 g of ammonium chloride in 3 liters of water is then added, the product is extracted with 1.5 liters of ether, and the organic phase is washed with saturated sodium chloride solution, dried over magnesium sulphate and evaporated under vacuum. The residue is chromatographed on silica, eluting with DCM and then with a DCM/AcOEt (95:5; v/v) mixture. 118 g of the expected product are obtained in the form of an oil.

Provenance & Evidence