Catalytic Asymmetric Conjugate Addition of a Borylalkyl Copper Complex for Chiral Organoboronate Synthesis
作者:Won Jun Jang、Jaesook Yun
DOI:10.1002/anie.201909712
日期:2019.12.9
We report the catalytic enantioselective conjugate addition of a borylalkyl copper nucleophile generated in situ from a 1,1-diborylmethane derivative to α,β-unsaturated diesters. In the presence of a chiral N-heterocyclic carbene (NHC)-copper catalyst, this method facilitated the enantioselective incorporation of a CH2 Bpin moiety at the β-position of the diesters to yield β-chiral alkyl boronates
我们报告了从1,1-二硼烷基甲烷衍生物原位生成的α,β-不饱和二酯的烷基烷基亲核试剂的催化对映选择性共轭加成反应。在手性N-杂环卡宾(NHC)-铜催化剂的存在下,该方法促进了在二酯的β-位上CH2 Bpin部分的对映选择性结合,从而以高达86%的收率得到β-手性烷基硼酸酯。高对映选择性。通过CB键的有机转化,将所得手性二酯产物中的烷基硼部分转化为各种官能团。