Carbene‐Catalyzed Enantioselective Aldol Reaction: Post‐Aldol Stereochemistry Control and Formation of Quaternary Stereogenic Centers
作者:Xing Yang、Pankaj Kumar Majhi、Huifang Chai、Bin Liu、Jun Sun、Ting Liu、Yonggui Liu、Liejin Zhou、Jun Xu、Jiawei Liu、Dongdong Wang、Yanli Zhao、Zhichao Jin、Yonggui Robin Chi
DOI:10.1002/anie.202008369
日期:2021.1.4
The dominated approaches for asymmetric aldol reactions have primarily focused on the aldol carbon–carbon bond‐forming events. Here we postulate and develop a new catalytic strategy that seeks to modulate the reaction thermodynamics and control the product enantioselectivities via post‐aldol processes. Specifically, an NHC catalyst is used to activate a masked enolate substrate (vinyl carbonate) to
不对称的羟醛反应的主要方法主要集中在羟醛碳-碳键形成事件上。在这里,我们提出并开发了一种新的催化策略,该策略试图通过后羟醛工艺调节反应热力学并控制产物的对映选择性。具体而言,NHC催化剂用于活化被掩盖的烯醇酸酯底物(碳酸乙烯酯),以非对映选择性的方式促进羟醛反应。该可逆的羟醛事件随后是对映选择性的酰基动力学拆分,其由相同的(手性)NHC催化剂介导,而没有引入任何其他物质。该醛醇缩合后的过程解决了对映选择性问题,并促使原本可逆的醛醇缩合反应朝着完全转化的方向发展。