Arylation and alkenylation of activated alkyl halides using sulfonamides
作者:Stuart Johnson、Ervin Kovács、Michael F. Greaney
DOI:10.1039/d0cc00220h
日期:——
of quaternary aryl amino acid derivatives can be synthesised using tandem SN2/Smiles rearrangement chemistry involving aryl sulfonamides and α-chloro carbonylcompounds. The reaction harnesses a sulfur dioxide extrusion pathway to construct a C-N and C-Caryl bond under simple conditions with no requirement for organometallics or transition metal catalysts. The reaction is also successful for alkenyl
Electrochemical Vicinal Difluorination of Alkenes: Scalable and Amenable to Electron‐Rich Substrates
作者:Sayad Doobary、Alexi T. Sedikides、Henry P. Caldora、Darren L. Poole、Alastair J. J. Lennox
DOI:10.1002/anie.201912119
日期:2020.1.13
oxidative difluorination of alkenes represents an important strategy for their preparation, yet current methods are limited in their alkene-types and tolerance of electron-rich, readily oxidized functionalities, as well as in their safety and scalability. Herein, we report a method for the difluorination of a number of unactivated alkene-types that is tolerant of electron-rich functionality, giving products
Nitrene Insertion into Aromatic and Benzylic C−H Bonds Catalyzed by Copper Complexes of Fluorinated Bis‐ and Tris(pyrazolyl)borates
作者:Tharun T. Ponduru、Zhicheng Sun、Thomas R. Cundari、H. V. Rasika Dias
DOI:10.1002/cctc.201901087
日期:2019.10.7
trace amounts of benzylicC−H insertion. The use of [H2B(3,5‐(CF3)2‐4‐(NO2)Pz)2]Cu(NCMe) that has an even weakly donating pyrazolate generated the arene C−H insertion product exclusively. The tris(pyrazolyl)borate complex [HB(3,5‐(CF3)2Pz)3]Cu(NCMe), in contrast, generated the benzylic amination product from mesitylene and PhI=NNs in 82 % yield with only very minor amounts of arene C−H functionalization
Palladium-Catalyzed Enantioselective 1,1-Fluoroarylation of Aminoalkenes
作者:Ying He、Zhenyu Yang、Richard T. Thornbury、F. Dean Toste
DOI:10.1021/jacs.5b07795
日期:2015.9.30
The development of an enantioselective palladium-catalyzed 1,1-fluoroarylation of unactivated aminoalkenes is described. The reaction uses arylboronicacids as the arene source and Selectfluor as the fluorine source to generate benzylic fluorides in good yields with excellent enantioselectivities. This transformation, likely proceeding through an oxidative Heck mechanism, affords 1,1-difunctionalized
Transition-metal-free direct amination of simple arenes with sulfonyl azides
作者:Lianggui Wang、Arun Jyoti Borah、Guobing Yan
DOI:10.1016/j.tetlet.2015.02.009
日期:2015.3
A metal-free green protocol has been developed for amination of simple arenes using arylsulfonyl azides via a nitrene transfer process under solvent free conditions at 130 degrees C releasing N-2 gas as the sole by-product. (C) 2015 Elsevier Ltd. All rights reserved.