A Novel Asymmetric Vinylogous Tin-Pummerer Rearrangement
作者:José Luis García Ruano、José Aleman、Albert Padwa
DOI:10.1021/ol0495725
日期:2004.5.1
A new type of vinylogous tin-Pummerer rearrangement reaction was observed when benzyl tin derivatives containing a sulfinyl group at the ortho position were allowed to react with acyl chlorides or TFAA. The reaction is thought to proceed by nucleophilic attack of the leaving carboxylate at the gamma-position of the conjugated thionium ion. The enantioselectivity (ee) of the reaction can reach values