Stereospecific Preparation of (<i>Z</i>)- and (<i>E</i>)-2,3-Difluoro-3-stannylacrylic Ester Synthons and a New, Efficient Stereospecific Route to (<i>Z</i>)- and (<i>E</i>)-2,3-Difluoroacrylic Esters<sup>1</sup>
作者:Yi Wang、Long Lu、Donald J. Burton
DOI:10.1021/jo0517949
日期:2005.12.1
The (Z)-2,3-difluoro-3-stannylacrylic ester is readily prepared from (Z)-1,2-difluorovinyltriethylsilane via stereospecific stannyl/silyl exchange with KF/(Bu3Sn)2O or Bu3SnCl in DMF at 70 °C. The corresponding (E)-2,3-difluoro-3-stannylacrylate is prepared by stereospecific carbonylation of (E)-1,2-difluorovinyl iodide followed by low temperature/in situ stannylation of the resultant (Z)-2,3-difluoroacrylic