Borane-Catalyzed, Chemoselective Reduction and Hydrofunctionalization of Enones Enabled by B–O Transborylation
作者:Kieran Nicholson、Thomas Langer、Stephen P. Thomas
DOI:10.1021/acs.orglett.1c00446
日期:2021.4.2
The use of stoichiometric organoborane reductants in organic synthesis is well established. Here these reagents have been rendered catalytic through an isodesmic B–O/B–H transborylation applied in the borane-catalyzed, chemoselectivealkenereduction and formal hydrofunctionalization of enones. The reaction was found to proceed by a 1,4-hydroboration of the enone and B–O/B–H transborylation with HBpin
The first generalpalladium-catalyzedcarbonylative vinylation of aryl halides with olefins in the presence of CO has been developed. Applying a catalyst system consisting of [(cinnamyl)PdCl](2) and bulky imidazolyl-phosphine ligand L1 allows for the efficient and selective synthesis of α,β-unsaturated ketones under mild reaction conditions. Starting from easily available aryl halides and olefins,
在 CO 存在下,第一个通用钯催化的芳基卤化物与烯烃的羰基化乙烯基化已经被开发出来。应用由 [(肉桂基)PdCl](2) 和庞大的咪唑基膦配体 L1 组成的催化剂体系,可以在温和的反应条件下高效和选择性地合成 α,β-不饱和酮。从容易获得的芳基卤化物和烯烃开始,可以以简单的方式制备通用的结构单元。证明了这种新协议的通用性和功能组耐受性。
Nickel-Catalyzed Enantioselective Reductive Conjugate Arylation and Heteroarylation via an Elementary Mechanism of 1,4-Addition
作者:Luoqiang Zhang、Mengxin Zhao、Maoping Pu、Zhaoming Ma、Jingsong Zhou、Caiyou Chen、Yun-Dong Wu、Yonggui Robin Chi、Jianrong Steve Zhou
DOI:10.1021/jacs.2c05678
日期:2022.11.9
A nickel complex of isoquinox promoted enantioselective conjugate arylation and heteroarylation of enones using aryl and heteroaryl halides directly. The reaction was successfully applied to stereoselective syntheses of ar-turmerone, chiral fragments of (+)-tolterodine and AZD5672. Mechanistically, experiments and calculations supported that an arylnickel(I) complex inserted to enones via an elementary
Merging Photocatalytic Doubly‐Decarboxylative C<sub>sp</sub><sup>2</sup>−C<sub>sp</sub><sup>2</sup> Cross‐Coupling for Stereo‐Selective (<i>E</i>)‐<i>α</i>,<i>β</i>‐Unsaturated Ketones Synthesis
作者:Subal Mondal、Siba P. Midya、Soumya Mondal、Suman Das、Pradyut Ghosh
DOI:10.1002/chem.202303337
日期:2024.1.26
cross-coupling reaction. Present catalytic system efficiently cross-coupled α, β-unsaturatedacids and α-keto acids to a variety of α, β-unsaturated ketones with excellent E-selectivity and functional group tolerance. In this merging catalysis, photocatalyst implicated through reductive quenching cycle whereas cross coupling proceeded over one electron oxidative pallado-cycle in a tandem pathway.