Green and versatile! The photocatalytic C(sp2)−H azolation of arenesusingheterogeneouscarbonnitride is reported. This strategy exhibits a broad substrate scope and is amenable to the late-stage functionalization of several pharmaceuticals. The catalyst can be easily recovered and reused leading to greener and more sustainable routes.
Oxidation-induced C–H amination leads to a new avenue to build C–N bonds
作者:Hong Yi、Zilu Tang、Changliang Bian、Hong Chen、Xiaotian Qi、Xiaoyu Yue、Yu Lan、Jyh-Fu Lee、Aiwen Lei
DOI:10.1039/c7cc04955b
日期:——
strategy, which not only leads to a new avenue to build C–N bonds, but also leads to different site-selectivity compared with “classic directing-groups”. The high selectivity of our new catalytic system originates from the heterogeneous electron-density distribution of the radical cation species which are induced by single electron transfer between the aromatics and oxidant-Cu(II) species.
Dehydrogenative Azolation of Arenes in a Microflow Electrochemical Reactor
作者:Laura Buglioni、Marko Beslać、Timothy Noël
DOI:10.1021/acs.joc.1c01409
日期:2021.11.19
The electrochemical synthesis of aryl azoles was performed for the first time in a microflow reactor. The reaction relies on the anodic oxidation of the arene partners making these substrates susceptible for C–H functionalization with azoles, thus requiring no homogeneous transition-metal-based catalysts. The synthetic protocol benefits from the implementation of a microflow setup, leading to shorter
作者:Janusz J. Kulagowski、Christopher J. Moody、Charles W. Rees
DOI:10.1039/c39820000548
日期:——
Thermal and photochemical decomposition of benzotriazoles (3) gives carbazoles (4) and (5), and cyclopentaquinolines (6), the formation of these products being rationalised by rearrangements in 4aH-carbazole intermediates (7); one proposed intermediate (11c) has been intercepted in an extended cycloaddition reaction with acrylonitrile.
Understanding and Exploitation of Neighboring Heteroatom Effect for the Mild N-Arylation of Heterocycles with Diaryliodonium Salts under Aqueous Conditions: A Theoretical and Experimental Mechanistic Study
The mechanism of arylation of N-heterocycles with unsymmetric diaryliodonium salts is elucidated. The fast and efficient N-arylation reaction is interpreted in terms of the bifunctionality of the substrate: The consecutive actions of properly oriented Lewis base and Brønstedacid centers in sufficient proximity result in the fast and efficient N-arylation. The mechanistic picture points to a promising