Asymmetric synthesis of trans-disubstituted cyclopropanes using phosphine oxides and phosphine boranes
作者:Celia Clarke、Stéphanie Foussat、David J. Fox、Daniel Sejer Pedersen、Stuart Warren
DOI:10.1039/b817433d
日期:——
The stereocontrolled synthesis of trans-disubstituted cyclopropylketones has been achieved from β-alkyl, γ-benzoyl phosphine oxides via a three-step cascade reaction incorporating an acyl transfer, phosphinoyl transfer and cyclisation to form the cyclopropane. Using Evans’ chiral oxazolidinone auxiliary and by masking the phosphine oxide moiety as a phosphine borane we have extended the method to the