Radical Hydrosilylation of Alkynes Catalyzed by Eosin Y and Thiol under Visible Light Irradiation
作者:Jing Zhu、Wei-Chen Cui、Shaozhong Wang、Zhu-Jun Yao
DOI:10.1021/acs.orglett.8b00909
日期:2018.6.1
A visible light-promoted hydrosilylation of alkynes has been explored and achieved using 1 mol % organic dye Eosin Y as the photocatalyst and a catalytic amount of thiol as the radical quencher. The corresponding alkenylsilanes were provided with high regio- and stereoselectivites in the reactions of various terminal and internal alkynes. The experimental evidence shows that the reaction is preferentially
Catalytic Alkyne Arylation Using Traceless Directing Groups
作者:Jung‐Woo Park、Bubwoong Kang、Vy M. Dong
DOI:10.1002/anie.201804955
日期:2018.10.8
to generate enamines, which are then hydrolyzed to either α‐arylphenones or α,α‐diarylketones. This Pd‐catalyzed method overcomes established known pathways to enable the use of amines as tracelessdirectinggroups for C−C bond formation.
Palladium-Catalyzed Oxidative Synthesis of α-Acetoxylated Enones from Alkynes
作者:Tuo Jiang、Xu Quan、Can Zhu、Pher G. Andersson、Jan-E. Bäckvall
DOI:10.1002/anie.201600696
日期:2016.5.4
report a palladium-catalyzed oxidative functionalization of alkynes to generate α-acetoxylated enones in one step. A range of functional groups are well-tolerated in this reaction. Mechanistic studies, including the use of (18) O-labeled DMSO, revealed that the ketone oxygen atom in the product originates from DMSO.
我们报告了一种钯催化的炔烃氧化官能化,一步生成α-乙酰氧基化烯酮。一系列官能团在此反应中具有良好的耐受性。包括使用 (18) O 标记的 DMSO 在内的机理研究表明,产品中的酮氧原子源自 DMSO。
Copper-Catalyzed Synthesis of Tetrasubstituted Enynylboronates via Chemo-, Regio-, and Stereoselective Borylalkynylation
作者:Jung Tae Han、Jaesook Yun
DOI:10.1021/acs.orglett.8b00665
日期:2018.4.6
An efficient, catalytic method for accessing tetrasubstituted enynylboronates has been established via copper-catalyzed chemo-, regio-, and stereoselective borylalkynylation of internal alkynes. In this protocol, a range of symmetrical and unsymmetrical internal alkynes with aryl, heteroaryl, and alkyl substituents afforded fully substituted enynylboron compounds in good yields and with high levels
Regio- and Stereoselective Radical Perfluoroalkyltriflation of Alkynes Using Phenyl(perfluoroalkyl)iodonium Triflates
作者:Xi Wang、Armido Studer
DOI:10.1021/acs.orglett.7b01215
日期:2017.6.2
A method for regio- and stereoselective anti-addition of the perfluoroalkyl and the triflate group of phenyl(perfluoroalkyl)iodonium triflates to alkynes is presented. The radical reaction uses cheap CuCl as a smart initiator and can be conducted in gram scale. The perfluoroalkyltriflated products are readily further functionalized, rendering this transformation valuable.