1,4-Addition of arylboronicacids to acrylic acid derivatives proceeds efficiently in the presence of a palladium catalyst system of Pd(OAc)2/(PhO)3P to produce the corresponding 3-arylpropionic acid derivatives. The use of the phosphite ligand is the key to conducting the addition smoothly with suppressing the competing Mizoroki−Heck-type oxidativecoupling.
Palladium-Catalyzed Oxidative Carbonylation of Alkyl and Aryl Indium Reagents with CO under Mild Conditions
作者:Yingsheng Zhao、Liqun Jin、Peng Li、Aiwen Lei
DOI:10.1021/ja801116s
日期:2008.7.1
CO now can react with organoindium reagents. A novel palladium-catalyzed oxidative carbonylation reaction of organoindium reagents by CO gas with desyl chloride as oxidant was developed in supplementation with the classical methods for preparation of carboxylic acid derivatives. Primary, secondary alkyl indium reagents with beta-hydrogens and aryl indium reagents were suitable substrates, and the reaction
CO 现在可以与有机铟试剂反应。在补充制备羧酸衍生物的经典方法的基础上,开发了一种新的钯催化的有机铟试剂氧化羰基化反应,以 CO 气体和脱磺酰氯为氧化剂。带有β-氢的一级、二级烷基铟试剂和芳基铟试剂是合适的底物,反应可以在60摄氏度和50 psi CO下进行。烷基铟试剂的羰基化可以在没有额外碱的情况下顺利进行。虽然铟试剂是由相应的格氏试剂(在低温下)制备的,但它们在质子反应条件下显示出与各种官能团的完全相容性。包括化学计量和催化反应检查在内的初步机理研究提供了支持该机理的运行的证据,该机理包括将去甲酰氯氧化加成到 Pd(0) 和快速互变异构化得到钯烯醇化物物质 II (ROPdCl),烯醇化物基团在 Pd(0) 中的置换。 II 由 R(2)OH 插入,然后插入 CO 得到烷氧基羰基钯配合物 V,该配合物与 R(1)(3)In 进行金属转移和还原消除,得到产物和 Pd(0) 物质。在这种机
Rhodium fluoroapatite (RhFAP) is an efficient catalyst for conjugateaddition of organoboron reagents to α,β-unsaturated carbonyl compounds. A variety of arylboronic acids and α,β-unsaturated carbonyl compounds were converted to the corresponding conjugate-addition products, demonstrating the versatility of the reaction. The reaction is highlyselective. RhFAP was recovered quantitatively by simple filtration
Highly Efficient and Reusable Polyaniline-Supported Palladium Catalysts for Open-Air Oxidative Heck Reactions under Base- and Ligand-Free Conditions
作者:Pravin R. Likhar、Moumita Roy、Sarabindu Roy、M. S. Subhas、M. Lakshmi Kantam、B. Sreedhar
DOI:10.1002/adsc.200800329
日期:2008.9.5
Oxidative Heckreactions of arylboronic acids and alkenes are carried out in the presence of polyaniline-supported palladiumcatalysts using air as a co-oxidant to afford the Heck products with excellent yields and selectivities under base- and ligand-free conditions. The catalyst was recovered by simple filtration and used for several cycles with consistent activity.
Regiochemical control in palladium(0) and palladium(<scp>II</scp>) catalysed alkene–formate ester carbonylation reactions
作者:Ivan J. B. Lin、Howard Alper
DOI:10.1039/c39890000248
日期:——
Palladium(0) complexes [Pd(PPh3)4 or Pd(dba)2], (dba = dibenzylideneacetone) in the presence of 1,4-bis(diphenylphosphino)butane, can catalyse the reaction of alkenes and formate esters to give linear carboxylic esters as the major product, while the branched chain isomer was the principal ester obtained by use of a palladium(II) complex [bis(triphenylphosphine)palladium dichloride] as the catalyst