A Drastic Effect of TEMPO in Zinc‐Catalyzed Stannylation of Terminal Alkynes with Hydrostannanes via Dehydrogenation and Oxidative Dehydrogenation
作者:Yuichi Kai、Shinya Oku、Tomohiro Tani、Kyoko Sakurai、Teruhisa Tsuchimoto
DOI:10.1002/adsc.201900540
日期:2019.9.17
With a system consisting of a catalytic zinc Lewis acid, pyridine, and TEMPO in a nitrile medium, terminal alkynes coupled with HSnBu3, providing alkynylstannanes with structural diversity. The resulting alkynylstannane, without being isolated, could be directly used for Pd‐ and Cu‐catalyzed transformations to deliver internal alkynes and more intricate tin‐atom‐containing molecules. Mechanistic studies
通过在腈介质中由催化锌路易斯酸,吡啶和TEMPO组成的系统,末端炔烃与HSnBu 3偶联,可提供具有结构多样性的炔基锡烷。生成的炔基锡烷无需分离即可直接用于Pd和Cu催化的转化,以传递内部炔烃和更复杂的含锡原子的分子。机制研究表明TEMPOSnBu 3原位形成从TEMPO和HSnBu 3作品stannylate末端炔与锌催化剂的协作,并且这两个脱氢和氧化脱氢工艺的被唯一地涉及在一个单一的反应。