Merging Photoredox with Brønsted Acid Catalysis: The Cross-Dehydrogenative C−O Coupling for sp<sup>3</sup>
C−H Bond Peroxidation
作者:Qing Xia、Qiang Wang、Changcun Yan、Jianyang Dong、Hongjian Song、Ling Li、Yuxiu Liu、Qingmin Wang、Xiangming Liu、Haibin Song
DOI:10.1002/chem.201701755
日期:2017.8.10
A photoredox and Brønsted acid synergistically catalyzed cross‐dehydrogenative C−O coupling reaction is developed in which isochroman peroxyacetals are formed through sp3 C−H bond peroxidation. The reported method is characterized by its extremely mild reaction conditions, excellent yields, and broad substrate scope. An oxocarbenium ion p‐chlorobenzenesulfonate was speculated to be the reactive intermediate
开发了一种光氧化还原和布朗斯台德酸协同催化的交叉脱氢CO偶联反应,其中异铬烷过氧缩醛通过sp 3 C-H键过氧化反应形成。报道的方法的特点是反应条件极其温和,收率优异且底物范围广。氧碳鎓离子对氯苯磺酸被认为是反应性中间体。研究了半缩醛和含氧二聚体对氧碳鎓离子有效稳定的作用。酸的存在似乎建立了含氧碳鎓离子对的半缩醛和含氧二聚体之间的平衡。该方法的广泛适用性突出了该协议用于分子合成的潜力。