A Novel Method for the Preparation of α,α‘-Difluoroesters and Acids Using BrF<sub>3</sub>
作者:Aviv Hagooly、Revital Sasson、Shlomo Rozen
DOI:10.1021/jo034829i
日期:2003.10.1
Alkyl-, haloalkyl-, and ketoalkyl-2-ethoxycarbonyl-1,3-dithianes were easily made from the appropriate primary or secondary alkyl bromides, 1,3-dithiane, and ethyl chloroformate. They were reacted with BrF3 to form the corresponding alpha,alpha-difluoro esters in 65-75% yield. Reaction conditions are very mild (1-2 min, 0 degreesC). The two sulfur atoms of the dithiane are essential for the reaction.