Light-driven selective aerobic oxidation of (iso)quinoliniums and related heterocycles
作者:Meimei Zhou、Keyang Yu、Jianxin Liu、Weimei Shi、Yingming Pan、Haitao Tang、Xiangjun Peng、Qian Liu、Hengshan Wang
DOI:10.1039/d1ra01226f
日期:——
Selective C1–H/C4–H carbonylation of N-methylene iminium salts, catalyzed by visible-light photoredox and oxygen in the air, has been reported. A ruthenium complex acts as a chemical switch to conduct two different reaction pathways and to afford two different kinds of products. In the absence of the ruthenium complex, the Csp2–H bondsadjacent to the nitrogenatoms are oxidized to α-lactams by the
transformation. This reaction features ambient air as the sole oxidant and oxygen source, a broad substrate scope, and excellent functional-group tolerance and proceeds under mild reaction conditions. Furthermore, a highly efficient synthesis of bioactive molecules and natural products including N-methylcrinasiadine, N-isopentylcrinasiadine, N-phenethylcrinasiadine, isoindolo[2,1-b]isoquinolin-5(7H)-one, PJ-34,