Bis(μ-oxo)–Dititanium(IV)–Chiral Binaphthyldisulfonate Complexes for Highly Enantioselective Intramolecular Hydroalkoxylation of Nonactivated Alkenes
作者:Wen-Bin Xie、Zhi Li
DOI:10.1021/acscatal.1c01146
日期:2021.5.21
A series of chiral 1,1′-binaphthyl-2,2′-disulfonic acids was designed, synthesized, and applied in a highly enantioselective Ti-catalyzed intramolecular hydroalkoxylation of nonactivated alkenes. The catalyst is probably a complex between two chiral binaphthyldisulfonate ligands and a bis(μ-oxo)–dititanium(IV) core structure. The sulfonamide groups of the ligands and water are necessary for the catalysis
设计,合成了一系列手性的1,1'-联萘-2,2'-二磺酸,并将其应用于高度对映选择性的Ti催化的非活化烯烃分子内加氢烷氧基化反应。该催化剂可能是两个手性联萘二磺酸酯配体与双(μ-氧代)-二钛(IV)核心结构之间的复合物。配体和水的磺酰胺基对于催化是必需的,因为它们可以通过氢键稳定催化活性的配合物。在温和条件下,以高达99%以上的收率和高达97%对映体过量的形式获得了各种2-甲基香豆素。