n of alkenes with anilines has been developed for the atom-economical synthesis of 2-substituted propanamides bearing an α-stereocenter. A novel phosphoramidite ligand L16 was discovered which exhibited very high reactivity and selectivity in the reaction. This asymmetric Markovnikov hydroaminocarbonylation employs readily available starting materials and tolerates a wide range of functional groups
Catalytic α-Hydroarylation of Acrylates and Acrylamides via an Interrupted Hydrodehalogenation Reaction
作者:Alena M. Vasquez、John A. Gurak、Candice L. Joe、Emily C. Cherney、Keary M. Engle
DOI:10.1021/jacs.0c03040
日期:2020.6.10
The palladium-catalyzed, α-selective hydroarylation of acrylates and acrylamides is reported. Under optimized conditions, this method is highly tolerant of a wide range of substrates including those with base sensitive functional groups and/or multiple enolizable carbonyl groups. A detailed mechanistic study was undertaken, and the high selectivity of this transformation was shown to be enabled by
Intermediate formation enabled regioselective access to amide in the Pd-catalyzed reductive aminocarbonylation of olefin with nitroarene
作者:Li Yang、Lijun Shi、Chungu Xia、Fuwei Li
DOI:10.1016/s1872-2067(20)63561-6
日期:2020.7
reductive aminocarbonylation of olefins with nitroarenes was developed using carbon monoxide (CO) as both reductant and carbonyl source, which enables facile access to amides with excellent regioselectivity and broad substrate scope. It is found that the counter anions of the Pd catalyst precursors significantly affect the reaction chemoselectivity and amide regioselectivity. Branched amides were mainly
摘要 以一氧化碳 (CO) 作为还原剂和羰基源,开发了一种钯催化烯烃与硝基芳烃还原氨基羰基化的有效途径,该途径可以轻松获得具有优异区域选择性和广泛底物范围的酰胺。发现Pd催化剂前体的抗衡阴离子显着影响反应化学选择性和酰胺区域选择性。支链酰胺主要以K2PdCl4为金属催化剂得到,膦配体对区域选择性没有影响,但影响催化反应活性。然而,当使用 Pd(CH3CN)4(OTf)2 时,膦配体对氨基羰基化区域选择性有显着影响;单齿膦倾向于形成支链酰胺,而双齿膦主要形成线性酰胺。从硝基芳烃还原的所有可能的 N 物种的捕获实验、初级动力学研究和控制反应表明,支链和线性酰胺的催化合成分别产生了氮烯(进一步转化为烯酰胺)和苯胺,这与之前的配体控制的区域选择性不同通过烯烃与胺的氨基羰基化合成酰胺。此外,所提出的合成路线可用于在温和条件下合成克级丙腈。与以前通过烯烃与胺的氨基羰基化合成酰胺的配体控制的区域选择性不
Organic ligand-free carbonylation reactions with unsupported bulk Pd as catalyst
作者:Shujuan Liu、Hongli Wang、Xingchao Dai、Feng Shi
DOI:10.1039/c8gc00740c
日期:——
ligand-free conditions, namely, hydroaminocarbonylation of olefins, aminocarbonylation of aryliodides and oxidative carbonylation of amines, which almost cover all the known mechanisms in carbonylation reactions. Notably, the bulk Pdcatalyst system exhibited better catalytic activity than the classical homogeneous PdCl2/(2-OMePh)3P catalyst system. This study will create a momentous and new field of green
Acid-free regioselective aminocarbonylation of alkenes
作者:Huizhen Liu、Ning Yan、Paul J. Dyson
DOI:10.1039/c4cc02167c
日期:——
An efficient method for the synthesis of N-aryl monosubstituted carboxamides via the Pd-catalyzed carbonylation of alkenes with CO and amines is described.