Stereochemical Surprises in the Lewis Acid-Mediated Allylation of Isatins
作者:Devendra J. Vyas、Roland Fröhlich、Martin Oestreich
DOI:10.1021/jo101420e
日期:2010.10.1
The BF3·OEt2-mediated allylation of isatin with an α-chiralallylicstannane is diastereo- and enantioselective. Conversely, allylation of any substituted isatin employing the identical protocol is not diastereoselective at all and only enantioselective for the major diastereomer having syn relative configuration. The anti isomer is, however, formed in almost racemic form. Both absolute and relative