Rh(I)/DpenPhos catalyzed asymmetric hydrogenation of enol esters and potassium (E)-3-cyano-5-methylhex-3-enoate
作者:Yan Liu、Zheng Wang、Kuiling Ding
DOI:10.1016/j.tet.2012.05.096
日期:2012.9
class of modular chiral monodentate phosphoramidites were highly efficient for the asymmetric hydrogenation of enol esters bearing α-aryl or α-alkyl groups, to afford the corresponding hydrogenation products in high enantioselectivities (87–95% ee) and reactivities (turnover number up to 10,000). These ligands were also shown to be effective in Rh(I)-catalyzed asymmetric hydrogenation of the potassium
一类模块化手性单齿亚磷酰胺的Rh(I)络合物对于带有α-芳基或α-烷基的烯醇酯的不对称氢化反应非常有效,从而可以提供高对映选择性(87-95%ee)的相应氢化产物。活动(周转数最多10,000)。这些配体还显示出在Rh(I)催化的(E)-3-氰基-5-甲基己基-3-烯酸酯的钾盐的Rh(I)催化的不对称氢化中有效,从而得到相应的产物(CI-1008的前体),并具有高达95%的ee,并且可以完成底物的完全转化。