Synthesis of Highly Substituted Arenes via Cyclohexadiene–Alkene C–H Cross Coupling and Aromatization
作者:Anup Bhunia、Armido Studer
DOI:10.1021/acscatal.8b00083
日期:2018.2.2
The development of a cross-coupling method for the regioselective β-alkenylation of 2,5-cyclohexadiene carboxylic acid derivatives to form ortho-alkenylarenes through in situ decarboxylation and aromatization is described. The carboxylic acid functionality is used as a traceless directing group for efficient and mild β-alkenylation. The modular sequence comprises a reductive Birch α-alkylation, ionic
Efficient Aqueous-Phase Heck Reaction Catalyzed by a Robust Hydrophilic Pyridine-Bridged Bisbenzimidazolylidene-Palladium Pincer Complex
作者:Tao Tu、Zhixun Wang、Xike Feng、Weiwei Fang
DOI:10.1055/s-0030-1259723
日期:2011.4
The first efficient example of NHC-palladium pincer complexcatalyzed aqueous Heck reaction with extremely low catalyst loadingwas realized without obvious hydrolysis of products by using a robusthydrophilic pyridine-bridged bisbenzimidazolylidene-palladiumcomplex as a molecular catalyst, which tolerated various electronicproperties of substituted functional groups in arenes.
Phosphine-free palladium-catalyzed MizorokiâHeck reaction was performed using ball-milling in polyethylene glycol under mild conditions. Good to excellent yields of coupling products were obtained. This activation technique also allowed the concomitant formation of round shaped PdâPEG nanoparticles that were characterized by TEM analysis.
Palladium/Norbornene-Mediated Tandem CH Amination/CI Alkenylation Reaction of Aryl Iodides with Secondary Cyclic<i>O</i>-Benzoyl Hydroxylamines and Activated Terminal Olefins
A novel palladium‐catalyzed norbornene‐mediated three‐component reaction for the construction of ortho‐alkenyl aromatic tertiary amines has been achieved, which represents a useful extension of the Catellani‐type tandem ortho‐selective CH amination transformations.
Borane catalyzed transesterification of <i>tert</i>-butyl esters using α-aryl α-diazoesters
作者:Maying Yan、Lei Xiao、Jiangkun Xiong、Lvnan Jin、Douglas W. Stephan、Jing Guo
DOI:10.1039/d3ob01548c
日期:——
The B(C6F5)3-catalyzed transesterification of a series of 3-alkenyl-oxindoles and other unsaturated tert-butyl esters with aryl-diazo esters is reported. This protocol is facile and generally high yielding proceeding under mild conditions and is remarkably chemoselective leaving the CC bonds intact.
报道了一系列3-烯基-羟吲哚和其他不饱和叔丁基酯与芳基重氮酯的B(C 6 F 5 ) 3催化酯交换反应。该方案在温和条件下操作简便且通常产率高,并且具有显着的化学选择性,使 C C 键完好无损。