Phosphoric Acid Mediated Light‐Induced Minisci C−H Alkylation of
<i>N</i>
‐Heteroarenes
作者:Songyang Jin、Xinxin Geng、Yujun Li、Ke Zheng
DOI:10.1002/ejoc.202001538
日期:2021.2.12
A visiblelight‐intduced/phosphate‐mediated light‐induced Minisci‐type reaction under metal‐ and photocatalyst‐free condition was developed, which provided an efficient and environmentally friendly way to access functionalized N‐heteroarenes. The transformation underwent a radical pathway, and the diphenyl phosphate played a key role in the catalytic cycle via hydrogen bonding.
The direct visible light-mediated C–Halkylation of heteroarenes using aliphatic carboxylic acids is reported. This mild method proceeds at low catalyst loadings (0.5 mol %) and has a high functional group tolerance and a broad substrate scope. Notably, functionalization of (iso)quinoline, pyridine, phthalazine, benzothiazole, and other heterocyclic derivatives with both cyclic and acyclic primary
Tertiary Alcohols as Radical Precursors for the Introduction of Tertiary Substituents into Heteroarenes
作者:Spencer P. Pitre、Mikko Muuronen、Dmitry A. Fishman、Larry E. Overman
DOI:10.1021/acscatal.9b00405
日期:2019.4.5
Despite many recent advances in the radical alkylation of electron-deficient heteroarenes since the seminal reports by Minisci and co-workers, methods for the direct incorporation of tertiary alkyl substituents into nitrogen heteroarenes are limited. This report describes the use of tert-alkyl oxalate salts, derived from tertiaryalcohols, to introduce tertiary substituents into a variety of heterocyclic
Alkylation of Heteroaromatic Bases with Diphenylselenium Diacyloxylate
作者:Hideo Togo、Nobukazu Miyagawa、Masataka Yokoyama
DOI:10.1246/cl.1992.1677
日期:1992.9
Heteroaromatic bases were alkylated with selenuranes, which were formed by the reaction of diphenylselenoxide and carboxylic anhydrides, under photoirradiation conditions. This reaction was presumed to proceed via a radical pathway accompanying decarboxylation.
C–H Alkylation of Heteroarenes with Alkyl Oxalates by Molecular Photoelectrocatalysis
作者:Hai-Chao Xu、Fan Xu、Xiao-Li Lai
DOI:10.1055/a-1296-8652
日期:2021.3
An oxidant- and metal-free photoelectrocatalytic C–H alkylation reaction of heteroarenes with alkyloxalates has been developed. Several classes of heteroaromatics, such as quinolines, isoquinolines, pyridines, and phenanthridines, can be alkylated with tertiary or secondary alkyloxalates. The photoelectrochemical synthesis employs 2,4,5,6-tetra-9H-carbazol-9-ylisophthalonitrile as a molecular catalyst