Palladium-catalyzed arylation of N,N-dialkylhydrazines and the subsequent conversion to anilines
摘要:
Palladium-catalyzed aminations of different ArBr with N,N-dialkylhydrazines are described. The reaction proceeded in moderate to excellent yield (up to 90%) with good functional groups compatibilities as cyano, ester, ketone and Boc-amine groups are all well tolerated. Several hydrazines were proved to be good coupling partners and this process provided a general method for the isosteric replacement of benzyl amines with arylhydrazines. Moreover, a method for the N-N bond cleavage of arylhydrazines was discovered, and this two-step sequence could be employed as an alternative synthesis of aniline derivatives. (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis of <i>N,N</i>-Dialkyl-<i>N</i><i>‘</i>-arylhydrazines via Palladium-Catalyzed N-Arylation by Using <i>N,N</i>-Dialkylhydrazines/2LiCl Adducts
[GRAPHICS]The reaction of N,N-dialkylhydrazine/2LiCl adducts with aryl bromides in the presence of Pd-2(dba)(3) as the palladium source, Xantphos or X-phos as the ligands, toluene as the solvent, and NaOBu-t as the base provides an efficient route to N,N-dialkyl-N,-arylhydrazines. Best results were obtained by using N,N-dialkylhydrazine/2LiCl adducts prepared in situ, omitting their isolation.
<i>N</i>-Ammonium Ylide Mediators for Electrochemical C–H Oxidation
作者:Masato Saito、Yu Kawamata、Michael Meanwell、Rafael Navratil、Debora Chiodi、Ethan Carlson、Pengfei Hu、Longrui Chen、Sagar Udyavara、Cian Kingston、Mayank Tanwar、Sameer Tyagi、Bruce P. McKillican、Moses G. Gichinga、Michael A. Schmidt、Martin D. Eastgate、Massimiliano Lamberto、Chi He、Tianhua Tang、Christian A. Malapit、Matthew S. Sigman、Shelley D. Minteer、Matthew Neurock、Phil S. Baran
DOI:10.1021/jacs.1c03780
日期:2021.5.26
taking a first-principles approach guided by computation, these new mediators were identified and rapidly expanded into a library using ubiquitous buildingblocks and trivial synthesis techniques. The ylide-based approach to C–H oxidation exhibits tunable selectivity that is often exclusive to this class of oxidants and can be applied to real-world problems in the agricultural and pharmaceutical sectors
Palladium-catalyzed arylation of N,N-dialkylhydrazines and the subsequent conversion to anilines
作者:Xiaoxiang Liu、Michael Barry、Hwei-Ru Tsou
DOI:10.1016/j.tetlet.2007.09.177
日期:2007.11
Palladium-catalyzed aminations of different ArBr with N,N-dialkylhydrazines are described. The reaction proceeded in moderate to excellent yield (up to 90%) with good functional groups compatibilities as cyano, ester, ketone and Boc-amine groups are all well tolerated. Several hydrazines were proved to be good coupling partners and this process provided a general method for the isosteric replacement of benzyl amines with arylhydrazines. Moreover, a method for the N-N bond cleavage of arylhydrazines was discovered, and this two-step sequence could be employed as an alternative synthesis of aniline derivatives. (c) 2007 Elsevier Ltd. All rights reserved.