Alkynes as Allylmetal Equivalents in Redox-Triggered C–C Couplings to Primary Alcohols: (<i>Z</i>)-Homoallylic Alcohols via Ruthenium-Catalyzed Propargyl C–H Oxidative Addition
作者:Boyoung Y. Park、Khoa D. Nguyen、Mani Raj Chaulagain、Venukrishnan Komanduri、Michael J. Krische
DOI:10.1021/ja505962w
日期:2014.8.27
The cationic ruthenium catalyst generated upon the acid–base reaction of H2Ru(CO)(PPh3)3 and 2,4,6-(2-Pr)3PhSO3H promotes the redox-triggered C–C coupling of 2-alkynes and primary alcohols to form (Z)-homoallylic alcohols with good to complete control of olefin geometry. Deuterium labeling studies, which reveal roughly equal isotopic compositions at the allylic and distal vinylic positions, along with
H2Ru(CO)(PPh3)3 和 2,4,6-(2-Pr)3PhSO3H 酸碱反应生成的阳离子钌催化剂促进氧化还原引发的 2-炔烃和伯醇的 C-C 偶联形成 (Z)-高烯丙醇,对烯烃几何形状有良好的完全控制。氘标记研究揭示了烯丙基和远端乙烯基位置的同位素组成大致相同,以及其他数据,证实了涉及钌 (0) 介导的丙二烯-醛氧化偶联形成瞬态氧杂环丁烯环的催化机制,这一事件最终定义了(Z)-烯烃立体化学。