Diol desymmetrization as an approach to the synthesis of unsymmetrical dienyl diesters
作者:David J. Phillips、Kathryn S. Pillinger、Wei Li、Angela E. Taylor、Andrew E. Graham
DOI:10.1016/j.tet.2007.07.089
日期:2007.10
The tandem oxidation/Wittig olefination of unactivated diols utilizing manganese dioxide produces α,β-unsaturated hydroxy esters in high yields in a highly effective desymmetrization process. The formation of small quantities of the corresponding lactones suggests that the reaction may proceed through a lactol intermediate in some cases. The α,β-unsaturated hydroxy esters are transformed into symmetrical
利用二氧化锰对未活化的二醇进行串联氧化/维蒂希烯化反应,可在高效的不对称化过程中以高收率产生α,β-不饱和羟基酯。少量相应内酯的形成表明,在某些情况下,反应可能会通过内酯中间体进行。使用PCC介导的第二次氧化/维蒂希烯化序列,将α,β-不饱和羟基酯转化为对称或不对称的二烯基二酯。