Fast Enantio‐ and Chemoselective Arylation of Ketones with Organoboronic Esters Enabled by Nickel/N‐Heterocyclic Carbene Catalysis
作者:Yuan Cai、Lin‐Xin Ruan、Abdul Rahman、Shi‐Liang Shi
DOI:10.1002/anie.202015021
日期:2021.3
tolerates aryl chlorides, fluorides, ethers, esters, amides, nitriles, and alkyl chlorides. The reaction is applied to late‐stage modifications of various densely functionalized medicinally relevant molecules. Preliminary mechanistic studies suggest that a rare enantioselective η2‐coordinating activation of ketone carbonyls is involved. This cross‐coupling‐like mechanism is expected to enable other challenging
据报道,一般高效,高度对映和化学选择性的N-杂环卡宾(NHC)/ Ni催化将易于获得的稳定的芳基硼酸酯加到酮中。该协议可提供出乎意料的快速访问权限(通常为10分钟),这些手性叔醇具有特别宽的底物范围和出色的官能团耐受性(76个示例,最高98%ee)。此过程与其他已知的Ni介导的Suzuki-Miyaura偶联正交,因为它可以耐受芳基氯,氟化物,醚,酯,酰胺,腈和烷基氯。该反应适用于各种紧密功能化的医学相关分子的后期修饰。初步机理研究表明,一种罕见的对映选择性η 2涉及酮羰基的配位活化。这种类似交叉耦合的机制有望实现酮类的其他挑战性转化。