Photoredox-neutral ring-opening pyridylation of cyclic oximes via phosphoranyl radical-mediated N O/C C bond cleavages and sequential radical-radical coupling
作者:Ting Zou、Yishu He、Rui Liu、Yihao Zhang、Siping Wei、Ji Lu、Jun Wang、Lin Wang、Qiang Fu、Dong Yi
DOI:10.1016/j.cclet.2022.107822
日期:2023.5
A novel photoredox-neutral ring-opening pyridylation of non-prefunctionalized cyclic oximes has been accomplished through phosphoranyl radical-mediated NO/CC bond cleavages followed by radical-radical coupling. This mild acid-, base-, and oxidant-free protocol provides highly site-selective and efficient access to distally pyridylated alkylnitriles, which could be scale-up synthesized and readily converted
非预功能化环状肟的新型光氧化还原-中性开环吡啶基化已通过磷酰基介导的 N O/C C 键断裂,然后进行自由基-自由基偶联来实现。这种温和的无酸、无碱和无氧化剂的方案提供了高度的位点选择性和高效的远端吡啶基化烷基腈,这些烷基腈可以按比例放大合成并很容易转化为骨架多样化的化合物。值得注意的是,通过氰基吡啶对高还原激发态光催化剂进行 SET 氧化而产生的氧化基态光催化剂可能会引发以下磷酰基介导的脱氧过程。