Application of novel enantiopure hydroxymethyl-substituted pyridine derivatives in asymmetric catalysis
作者:Christian Eidamshaus、Hans-Ulrich Reissig
DOI:10.1016/j.tetasy.2011.08.017
日期:2011.9
modification of enantiopure hydroxymethyl-substituted pyridine derivatives leading to novel chiral ligands is described. A set of these pyridine derivatives was examined as ligands in asymmetric transformations such as enantioselective alkylations or alkynylations of aldehydes, the asymmetric copper-catalyzed Henry reaction and the asymmetric allylation of benzaldehyde with allyl(trichloro)silane. This
描述了导致新的手性配体的对映体纯的羟甲基取代的吡啶衍生物的合成修饰。研究了一组这些吡啶衍生物作为不对称转化的配体,例如醛的对映选择性烷基化或炔基化,铜的不对称铜亨利反应以及苯甲醛与烯丙基(三氯)硅烷的不对称烯丙基化。第一次筛选显示,所制备的几种吡啶衍生物是有效的配体,具有高收率和良好的对映选择性。醛与二乙基锌的不对称烷基化提供了高达93%的收率和对映体过量高达88%的收率。不对称亨利反应物也有效地被制得的配位体得到的一个(催化小号)-2-硝基-1-苯基乙醇,产率为68%,ee为70%。