Synthesis of Chiral β-Borylated Carboxylic Esters via Nickel-Catalyzed Asymmetric Hydrogenation
作者:Zhengyu Han、Gang Liu、Xianghe Zhang、Anqi Li、Xiu-Qin Dong、Xumu Zhang
DOI:10.1021/acs.orglett.9b00994
日期:2019.6.7
The highly efficient Ni-catalyzed asymmetric hydrogenation of β-boronic ester substituted-α,β-unsaturated carboxylic esters was successfully developed using (S,S)-Ph-BPE as the ligand. A series of chiral β-borylated carboxylic esters were obtained with high yields (94%–99% yields) and excellent enantioselectivities (89%–99% ee). The gram-scale asymmetric hydrogenation with a low catalyst loading (0
以(S,S)-Ph-BPE为配体成功地开发了高效Ni催化的β-硼酸酯取代的α,β-不饱和羧酸酯的不对称加氢反应。获得了一系列高收率(94%–99%收率)和出色的对映选择性(89%–99%ee)的手性β-硼化羧酸酯。具有低催化剂负载量(0.25 mol%)的克级不对称氢化和氢化产物的合成转化证明了该方法的巨大合成效用。