Oxygen-atom insertion of NHC–copper complex: The source of oxygen from N,N-dimethylformamide
摘要:
An unprecedented protocol for oxygen-atom insertion reaction of NHC-copper complexes has been developed by employing N,N-dimethylformamide as the oxygen source, which allows the preparation of imidazolinones from carbene complexes and decodes one of the mysterious transformations of NHC-metal complexes as well. (C) 2013 Elsevier B.V. All rights reserved.
Oxygen-atom insertion of NHC–copper complex: The source of oxygen from N,N-dimethylformamide
摘要:
An unprecedented protocol for oxygen-atom insertion reaction of NHC-copper complexes has been developed by employing N,N-dimethylformamide as the oxygen source, which allows the preparation of imidazolinones from carbene complexes and decodes one of the mysterious transformations of NHC-metal complexes as well. (C) 2013 Elsevier B.V. All rights reserved.
Herein, a copper‐catalyzed C−F bond defluorosilylation reaction of tetrafluoroethylene and other polyfluoroalkenes is described. Mechanistic studies, based on a series of stoichiometric reactions with copper complexes, revealed that the key steps of this defluorosilylation reaction are 1) the 1,2‐addition of a silylcopper intermediate to the polyfluoroalkene and 2) a subsequent selective β‐fluorine
Cu-Catalyzed Carbonylative Silylation of Alkyl Halides: Efficient Access to Acylsilanes
作者:Li-Jie Cheng、Neal P. Mankad
DOI:10.1021/jacs.9b12043
日期:2020.1.8
A Cu-catalyzed carbonylative silylation of unactivated alkyl halides has been developed, enabling efficient synthesis of alkyl-substituted acylsilanes in high yield. A variety of functional groups are tolerated under the mild reaction conditions, and primary, secondary and tertiaryalkyl halides are all applicable. The practical utility of this method has been demonstrated in the synthesis of acylsilanes
已开发出未活化的烷基卤化物的 Cu 催化羰基化硅烷化,能够以高产率高效合成烷基取代的酰基硅烷。在温和的反应条件下可耐受多种官能团,伯、仲、叔烷基卤均适用。该方法的实际效用已在带有不同甲硅烷基的酰基硅烷的合成中以及在一锅中将产物原位还原为相应的-羟基硅烷中得到证明。机理实验表明,甲硅烷基铜中间体通过单电子转移激活烷基卤化物以形成烷基自由基中间体,并且碳 - 卤素键断裂不参与速率决定步骤。
Differential Dihydrofunctionalization of Terminal Alkynes: Synthesis of Benzylic Alkyl Boronates through Reductive Three-Component Coupling
作者:Megan K. Armstrong、Gojko Lalic
DOI:10.1021/jacs.9b02372
日期:2019.4.17
The differential dihydrofunctionalization of terminalalkynes is accomplished through the reductive three-component coupling of terminalalkynes, aryl halides, and pinacolborane. The transformation results in hydrofunctionalization of both π-bonds of an alkyne in a single reaction promoted by cooperative action of a copper/palladium catalyst system. The differential dihydrofunctionalization reaction
Catalyst Controlled Regiodivergent Arylboration of Dienes
作者:Stephen R. Sardini、M. Kevin Brown
DOI:10.1021/jacs.7b05477
日期:2017.7.26
A method for the regiodivergent arylboration of dienes is presented. These reactions allow for the formation of a diverse range of synthetically versatile products from simple precursors. Through mechanistic studies, these reactions likely operate by initial addition of a Cu-Bpin complex across the diene followed by Pd-catalyzed cross coupling with an aryl halide or pseudohalide.
Investigating the Structure and Reactivity of Azolyl-Based Copper(I)–NHC Complexes: The Role of the Anionic Ligand
作者:Michael Trose、Fady Nahra、Albert Poater、David B. Cordes、Alexandra M. Z. Slawin、Luigi Cavallo、Catherine S. J. Cazin
DOI:10.1021/acscatal.7b02737
日期:2017.12.1
A family of copper(I)–NHC azolyl complexes was synthesized and deployed in the hydrosilylation of dicyclo-hexylketone to probe the role of the anionic ligand on catalytic performance. The azolyl ligand is shown to have a crucial role in catalytic activity without the need for additives, and this at very lowcatalystloading.