Photoredox and Weak Brønsted Base Dual Catalysis: Alkylation of α-Thio Alkyl Radicals
作者:Edwin Alfonzo、Sudhir M. Hande
DOI:10.1021/acscatal.0c03851
日期:2020.11.6
activation of thioethers to α-thio alkyl radicals and their addition to electron-deficient olefins to afford alkylated products through dual photoredox and weak Brønsted base catalysis. Mechanistic studies are consistent with a two-step activation mechanism, where oxidation of thioethers to their corresponding sulfide radical cations by an acridinium photoredox catalyst is followed with deprotonation by
我们报道了硫醚对α-硫代烷基的C–H活化作用,以及它们向缺电子烯烃中的加成,从而通过双重光氧化还原和弱布朗斯台德碱催化作用提供烷基化产物。机理研究与两步活化机理一致,在此过程中,ether啶光氧化还原催化剂将硫醚氧化成其相应的硫化物自由基阳离子,然后用三氟乙酸酯进行去质子化,生成α-硫代烷基自由基和三氟乙酸(TFA)。实验研究支持TFA参与导致产品形成的所有后续步骤。