Photocatalyst-controlled and visible light-enabled selective oxidation of pyridinium salts  

作　　者：Xiang-Jun Peng Hai-Ping He Qian Liu Kun She Bao-Qi Zhang Heng-Shan Wang Hai-Tao Tang Ying-Ming Pan 

机构地区：[1]State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources,School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University,Guilin 541004,China [2]Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education,Gannan Medical University,Ganzhou 341000,China

出　　处：《Science China Chemistry》2021年第5期753-760,共8页中国科学（化学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(22061003,21861006);the Guangxi Natural Science Foundation of China(2016GXNSFEA380001,2019GXNSFAA245027);the Guangxi Key R&D Program(AB18221005);the Science and Technology Major Project of Guangxi(AA17204058-21);Guangxi Science and Technology Base and Special Talents(guike AD19110027).

摘　　要：This study proposes two different methods of photocatalytic-controlled and visible light-induced selective oxidation of pyridiniums with air as the terminal oxidant.The key to these transformations is to choose the appropriate light source and photocatalyst.Pyridiniums are successfully converted into pyrroles through oxygen-mediated cycloaddition,proton-coupled electron transfer(PCET),pyridine ring opening,and recyclization.The other route is that pyridiniums selectively form 4-carbonyl pyridines through free radical rearrangement/aerobic oxidation under the catalysis of cobalt(Ⅱ).

关 键 词：photocatalytic-controlled reaction proton-coupled electron transfer ring opening/recyclization process rearrangement/aerobic oxidation the Ladenburg rearrangement PYRIDINIUM 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] TQ253.2[化学工程—有机化工]