Chiral Metallacycles as Catalysts for Asymmetric Conjugate Addition of Styrylboronic Acids to α,β-Enones
作者:Tao Hong、Zibin Zhang、Yan Sun、Jia-Ju Tao、Jia-Dong Tang、Chunsong Xie、Min Wang、Fang Chen、Shang-Shu Xie、Shijun Li、Peter J. Stang
DOI:10.1021/jacs.0c01563
日期:2020.6.10
catalysts has been proven to have great advantages in asymmetric catalysis. We constructed two chiral metalla-triangles by highly efficient coordination-driven self-assembly from a chiral 3,3'-dipyridyl substituted BINOL donor. They were successfully applied in asymmetric conjugate addition of a series of α,β-unsaturated ketones with trans-styrylboronic acids. The use of these metalla-triangles as supramolecular
将自组装策略引入催化剂的构建已被证明在不对称催化方面具有很大的优势。我们通过高效的配位驱动自组装从手性 3,3'-二吡啶基取代的 BINOL 供体构建了两个手性金属三角形。它们成功地应用于一系列α,β-不饱和酮与反式苯乙烯基硼酸的不对称共轭加成。使用这些金属三角形作为超分子催化剂显然有利于提高加成反应中的催化活性和立体选择性。在手性金属三角形的诱导下,一系列 α,β-烯酮以中等至定量的产率 (40-98%) 转化为手性 γ,δ-不饱和酮,并具有高对映选择性 (87-96% ee)。