Dialkyl Ether Formation by Nickel‐Catalyzed Cross‐Coupling of Acetals and Aryl Iodides
作者:Kevin M. Arendt、Abigail G. Doyle
DOI:10.1002/anie.201503936
日期:2015.8.17
A new substrate class for nickel‐catalyzed C(sp3) cross‐coupling reactions is reported. α‐Oxy radicals generated from benzylic acetals, TMSCl, and a mild reductant can participate in chemoselective cross‐coupling with aryliodides using a 2,6‐bis(N‐pyrazolyl)pyridine (bpp)/Ni catalyst. The mild, base‐free conditions are tolerant of a variety of functional groups on both partners, thus representing
a single-electron reducing agent under photoirradiation from a blue light-emitting diode, in the presence of appropriate electron acceptors, and the resulting sulfur-centered radical species undergoes hydrogenatomabstraction. This dual-role catalysis by TBA enables regioselectivie Cα–H arylation of benzylamines, benzyl alcohols, and ethers, as well as dihydroimidazoles, with cyano(hetero)arenes in
Palladium-Catalyzed Reductive Cross-Coupling Reaction of Aryl Chromium(0) Fischer Carbene Complexes with Aryl Iodides
作者:Kang Wang、Yu Lu、Fangdong Hu、Jinghui Yang、Yan Zhang、Zhi-Xiang Wang、Jianbo Wang
DOI:10.1021/acs.organomet.7b00657
日期:2018.1.8
The first palladium-catalyzed reductive cross-couplings of aryl chromium(0) carbene complexes with aryliodides have been realized. This coupling reaction shows excellent functional group tolerance and high efficiency. Mechanistically, aryl chromium(0) carbene complexes undergo transmetalation with arylpalladium species to generate palladium(II) carbene intermediates, which is followed by migratory
A catalytic amount of a sterically and electronically tuned diarylsulfonamide promoted allylic and benzylic C–H arylations in cooperation with a visible light photoredox catalyst. This is the first example of the catalytic use of a sulfonamidyl radical to promote the hydrogen atom transfer process.
3-Amino-fluorene-2,4-dicarbonitriles (AFDCs) as Photocatalysts for the Decarboxylative Arylation of α-Amino Acids and α-Oxy Acids with Arylnitriles
作者:Yiyang Chen、Ping Lu、Yanguang Wang
DOI:10.1021/acs.orglett.9b00443
日期:2019.4.5
1-(4-(9H-Carbazol-9-yl)phenyl)-3-amino-9H-fluorene-2,4-dicarbonitrile as a new photocatalyst for the decarboxylative cross-coupling reaction of alpha-amino acids or alpha-oxy carboxylic acids with arylnitriles is described. This light-driven reaction enables a variety of benzylic amines and ethers to be prepared from readily available starting materials under mild conditions.