Synthesis of Chiral Tertiary Boronic Esters by Oxime-Directed Catalytic Asymmetric Hydroboration
作者:Veronika M. Shoba、Nathan C. Thacker、Andrew J. Bochat、James M. Takacs
DOI:10.1002/anie.201509137
日期:2016.1.22
now report that the oxime‐directed CAHB of alkyl‐substituted methylidene and trisubstituted alkene substrates by pinacolborane (pinBH) affords oxime‐containing chiral tertiary boronic esters with yields up to 87 % and enantiomeric ratios up to 96:4 e.r. The utility of the method is demonstrated by the formation of chiral diols and O‐substitutedhydroxylamines, the generation of quaternary carbon stereocenters