Observations on the Deprotection of Pinanediol and Pinacol Boronate Esters via Fluorinated Intermediates
作者:Steven R. Inglis、Esther C. Y. Woon、Amber L. Thompson、Christopher J. Schofield
DOI:10.1021/jo901930v
日期:2010.1.15
pinacol esters of various boronic acids via fluoroborane intermediates were evaluated. Treatment of the boronate esters with potassium hydrogen difluoride normally gives trifluoroborate salts; in the case of α-amido alkyl or o-amido phenyl boronate esters, aqueous workup gives difluoroboranes. Procedures for transformation of both trifluoroborates and difluoroboranes to free boronic acids are described.