作者:Edwin Alfonzo、Sudhir M. Hande
DOI:10.1021/acs.orglett.1c02151
日期:2021.8.6
thioethers to α-thio alkyl radicals and their addition to N-methoxyheteroarenium salts for the redox-neutral synthesis of α-heteroaromatic thioethers. Studies are consistent with a two-step activation mechanism, where oxidation of thioethers to sulfide radical cations by a photoredox catalyst is followed by α-C–H deprotonation by a weak Brønsted base catalyst to afford α-thio alkyl radicals. Further,
我们报告了硫醚对 α-硫代烷基自由基的 C-H 活化以及它们与N-甲氧基杂芳鎓盐的加成,用于氧化还原中性合成 α-杂芳族硫醚。研究与两步活化机制一致,其中通过光氧化还原催化剂将硫醚氧化为硫化物自由基阳离子,然后通过弱 Brønsted 碱催化剂进行 α-C-H 去质子化以提供 α-硫代烷基自由基。此外,N-甲氧基杂芳鎓盐作为甲氧基自由基的来源,有助于α-硫代烷基自由基的产生和再生光氧化还原催化循环的牺牲氧化剂,发挥了额外的作用。