Cu-Photoredox-catalyzed C(sp)–C(sp<sup>3</sup>) coupling of redox-active esters with terminal alkynes
作者:Yajing Zhang、Dayong Zhang
DOI:10.1039/d0ob00835d
日期:——
groups. Mechanistic experiments suggested that this reaction may undergo a radical process. Under mild reaction conditions, a copper acetylide ligand as a photocatalyst delivered an electron to redox-active ester derivatives, and generated alkyl radicals. The radicals reacted with Cu(II) to deliver a Cu(III) complex, and then reductive elimination gave the products.
可见光诱导的C(sp)–C(sp 3已经开发了氧化还原活性酯与末端炔烃的偶联。羧酸作为其氧化还原活性酯衍生物的活化对于这种脱羧炔基反应是重要的。此处建立的策略有助于直接引入三键官能团,并避免了其他光催化剂。各种各样的伯,仲和叔酸都可以转化为目标产物。因此该反应具有广泛的底物范围和对官能团的耐受性。机械实验表明该反应可能经历自由基过程。在温和的反应条件下,乙炔铜配体作为光催化剂将电子传递至氧化还原活性酯衍生物,并生成烷基。自由基与Cu(II)生成Cu(III)络合物,然后还原消除得到产物。