Aerobic cross-dehydrogenative couplings of N-heteroarenes with toluene derivatives at room temperature
作者:Qiao-Lin Wang、Huawen Huang、Zhaozhao Sun、Yufeng Chen、Guo-Jun Deng
DOI:10.1039/d1gc02547c
日期:——
A set of mild aerobic cross-dehydrogenativecouplings of N-heteroarenes with the benzylic C(sp3)–H bond has been achieved by using visible-light-induced photocatalysis. This approach was found to provide a sustainable alternative to Minisci benzylation reactions using readily accessible toluene derivatives as benzylating agents. The unique combination of photocatalysis, bromo radical mediation, and
Rhenium-catalyzed dehydrogenative olefination of C(sp<sup>3</sup>)–H bonds with hypervalent iodine(<scp>iii</scp>) reagents
作者:Haidong Gu、Congyang Wang
DOI:10.1039/c5ob00619h
日期:——
dehydrogenative olefination of C(sp3)–H bonds is disclosed here, by merging rhenium catalysis with an alanine-derived hypervalentiodine(III) reagent. Thus, cyclic and acyclic ethers, toluene derivatives, cycloalkanes, and nitriles are all successfully alkenylated in a regio- and stereoselective manner.
A metal-free yne-addition/1,4-aryl migration/decarboxylation cascade reaction of alkynoates with C<sub>sp3</sub>–H centers
作者:De-Long Kong、Liang Cheng、Hong-Ru Wu、Yang-Xiong Li、Dong Wang、Li Liu
DOI:10.1039/c5ob02478a
日期:——
aryl alkynoates with five different types of radical precursors (R–H) through an yne-addition/1,4-aryl migration/decarboxylation process was reported, which allowed facile and convenient access to functionalized vinyl products with “R” and protons located at the identical carbon of the formed double bond.
Nickel-Catalyzed Benzylation of Aryl Alkenes with Benzylamines via C–N Bond Activation
作者:Hui Yu、Bin Hu、Hanmin Huang
DOI:10.1021/acs.joc.8b02279
日期:2018.11.16
example of nickel-catalyzed Heck-type benzylation of aryl olefins with various benzylamines as benzyl electrophiles, and the benzylic C–N bond cleavage was efficiently promoted by the amine–I2 charge transfer complex (CT complex). The combination of low-cost NiCl2 and I2 has been found to facilitate Heck reaction of tertiary benzylamines and alkenes into various benzyl-substituted alkenes in good to
A Surprising Substituent Effect Provides a Superior Boronic Acid Catalyst for Mild and Metal-Free Direct Friedel-Crafts Alkylations and Prenylations of Neutral Arenes
作者:Carolynne L. Ricardo、Xiaobin Mo、J. Adam McCubbin、Dennis G. Hall
DOI:10.1002/chem.201500020
日期:2015.3.9
for Friedel–Crafts alkylations is an important objective of interest toward the production of pharmaceuticals and commodity chemicals. Herein, 2,3,4,5‐tetrafluorophenylboronic acid was identified as a potent air‐ and moisture‐tolerant metal‐free catalyst that significantly improves the scope of direct Friedel–Crafts alkylations of a variety of slightly activated and neutral arenes, including polyarenes