Light‐Promoted Minisci Coupling Reaction of Ethers and Aza Aromatics Catalyzed by Au/TiO
<sub>2</sub>
Heterogeneous Photocatalyst
作者:Zhanchong Li、Liangying Wu、Jiabao Guo、Yifei Shao、Yang Song、Yuzhou Ding、Li Zhu、Xiaoquan Yao
DOI:10.1002/cctc.202100298
日期:2021.8.20
light-promoted Minisci oxidative coupling reaction of ether and aza aromatics by using oxygen as green oxidant and only catalytic amount of acid as additive. The protocol shows a good functional group tolerance as well as good to excellent yields for various substrates. With mechanistic studies, Au/TiO2 nanocomposite proved to be an efficient photocatalyst to activate C−H bond via a SEO approach of heteroatoms
Direct Cα-heteroarylation of structurally diverse ethers via a mild N-hydroxysuccinimide mediated cross-dehydrogenative coupling reaction
作者:Shihui Liu、Aoxia Liu、Yongqiang Zhang、Wei Wang
DOI:10.1039/c6sc05697k
日期:——
An important challenge in the Cα-heteroarylation of ethers is the requirement of a large excess amount of ethers (that are used as solvents in many cases) to achieve effective transformations. This drawback has significantly restricted the Cα-heteroarylation of ethers to the use of simple and easily accessible ether substrates. To overcome this limitation, a new, efficient, N-hydroxysuccinimide (NHS)
Diacetyl as a “traceless” visible light photosensitizer in metal-free cross-dehydrogenative coupling reactions
作者:Chia-Yu Huang、Jianbin Li、Wenbo Liu、Chao-Jun Li
DOI:10.1039/c8sc05631e
日期:——
light-sensitive and “traceless” hydrogen atom abstractor to achieve metal-free cross-dehydrogenative Minisci alkylation under mild conditions. Mechanistic studies supported hydrogen atom transfer (HAT) between an activated C(sp3)–H substrate and diacetyl. Moreover, with the assistance of di-tert-butyl peroxide (DTBP), the scope of the reaction could be extended to strong aliphatic C–H bonds via diacetyl-mediated
Electrophotocatalytic C–H Functionalization of Ethers with High Regioselectivity
作者:He Huang、Zack M. Strater、Tristan H. Lambert
DOI:10.1021/jacs.9b11472
日期:2020.1.29
The highly regioselective electrophotocatalytic C-H functionalization of ethers is described. These reactions are catalyzed by a trisaminocyclopropenium (TAC) ion in a mild electrochemical potential with visible light irradiation. Ethers undergo oxidant-free coupling with isoquinolines, alkenes, alkynes, pyrazoles, and purines with typically high regioselectivity for the less-hindered α-position. The
Transition-metal-free cross-dehydrogenative alkylation of pyridines under neutral conditions
作者:Xin Li、Hao-Yuan Wang、Zhang-Jie Shi
DOI:10.1039/c3nj00095h
日期:——
A mild and efficient method has been developed for the direct dehydrogenative alkylation of unprotonated pyridine derivatives. The avoidance of using acids and transition-metals makes this protocol “greener” and more practical for the synthesis of substituted pyridines.