Chiral Bifunctional Phosphine Ligand-Enabled Cooperative Cu Catalysis: Formation of Chiral α,β-Butenolides via Highly Enantioselective γ-Protonation
作者:Xinpeng Cheng、Tianyou Li、Kaylaa Gutman、Liming Zhang
DOI:10.1021/jacs.1c05781
日期:2021.7.28
novel Cu(I)-ligand cooperative catalysis. The reaction is enabled by a chiral biphenyl-2-ylphosphine ligand featuring a remote tertiary amino group. Density functional theory studies support the cooperation between the metal center and the ligand basic amino group during the initial soft deprotonation and the key asymmetric γ-protonation. Remarkably, other coinage metals, that is, Ag and Au, can readily
具有≥96% 对映体过量的 α,β-丁烯内酯是由 β,γ-丁烯内酯通过新型 Cu(I)-配体协同催化合成的。该反应由具有远程叔氨基的手性联苯-2-基膦配体实现。密度泛函理论研究支持金属中心和配体碱性氨基在初始软去质子化和关键不对称γ-质子化过程中的合作。值得注意的是,其他造币金属,即 Ag 和 Au,在这种不对称异构化化学中可以很容易地承担与 Cu 相同的作用。