Dynamic Kinetic Resolution of Alcohols by Enantioselective Silylation Enabled by Two Orthogonal Transition‐Metal Catalysts
作者:Jan Seliger、Martin Oestreich
DOI:10.1002/anie.202010484
日期:2021.1.4
A nonenzymatic dynamic kinetic resolution of acyclic and cyclic benzylic alcohols is reported. The approach merges rapid transition‐metal‐catalyzed alcohol racemization and enantioselective Cu‐H‐catalyzed dehydrogenative Si‐O coupling of alcohols and hydrosilanes. The catalytic processes are orthogonal, and the racemization catalyst does not promote any background reactions such as the racemization
报道了无环和环状苯甲醇的非酶动态动力学拆分。该方法融合了快速过渡金属催化的醇外消旋化和对映选择性 Cu-H 催化的醇和氢硅烷的脱氢 Si-O 偶联。催化过程是正交的,并且外消旋催化剂不会促进任何背景反应,例如甲硅烷基醚的外消旋及其非选择性形成。常用的钌半夹心配合物并不合适,但双功能钌钳形配合物完美地实现了这一目的。由此,可以高产率和良好的对映选择水平实现外消旋醇混合物的对映选择性硅烷化。