Highly Regio- and Enantioselective Reductive Coupling of Alkynes and Aldehydes via Photoredox Cobalt Dual Catalysis
作者:Yan-Lin Li、Shi-Qi Zhang、Jie Chen、Ji-Bao Xia
DOI:10.1021/jacs.1c03527
日期:2021.5.19
A Co-catalyzed highly regio- and enantioselective reductive coupling of alkynes and aldehydes has been developed under visible light photoredox dual catalysis. A variety of enantioenriched allylic alcohols have been obtained by using unsymmetrical internal alkynes and commercially available catalyst, chiral ligand, and reagents. It is noteworthy that this approach has considerable advantages, such
在可见光光氧化还原双催化下开发了一种共催化的炔烃和醛的高度区域选择性和对映选择性还原偶联。通过使用不对称内部炔烃和市售催化剂、手性配体和试剂,已经获得了多种对映体富集的烯丙醇。值得注意的是,这种方法具有相当大的优势,例如出色的区域-(> 40 个示例> 95:5)、立体-(高达> 95:5 E / Z)和对映选择性(92-99% ee,> 35个例子)控制,反应条件温和,底物范围广,官能团相容性好,使其对映选择性炔-醛还原偶联反应有了很大的改进。
Alkyne Hydroacylation: Switching Regioselectivity by Tandem Ruthenium Catalysis
作者:Qing-An Chen、Faben A. Cruz、Vy M. Dong
DOI:10.1021/ja512015w
日期:2015.3.11
By using tandem Ru-catalysis, internal alkynes can be coupled with aldehydes for the synthesis of β,γ-unsaturated ketones. The catalyst promotes alkyne transformations with high regioselectivity, with examples that include the differentiation of a methyl vs ethyl substituent on the alkyne. Mechanistic studies suggest that the regioselectivity results from a selective allene formation that is governed
Palladium-Catalyzed Direct C–H Allylation of Electron-Deficient Polyfluoroarenes with Alkynes
作者:Jun Zheng、Bernhard Breit
DOI:10.1021/acs.orglett.8b00393
日期:2018.4.6
A palladium-catalyzed intermolecular direct C–H allylation of polyfluoroarenes with alkynes is reported. Unlike classic hydroarylation reactions, alkynes are used as allylic electrophile surrogates in this direct aromatic C–H allylation. As an atom-economic and efficient method, various linear allylated fluoroarenes were synthesized from two simple and easy-to-access feedstocks in good to excellent
Palladium-Catalyzed Dearomative Allylic Alkylation of Indoles with Alkynes To Synthesize Indolenines with C3-Quarternary Centers
作者:Shang Gao、Zijun Wu、Xinxin Fang、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.6b01947
日期:2016.8.5
A palladium-catalyzed dearomative allylicalkylation of indoles with alkynes to construct indolenines with C3-quarternary centers was reported. The in situ formed arylallene intermediate omitted the need to install leaving groups on the allylic compounds and employ extra oxidants to oxidize the allylic C–H bonds. The reaction exhibited good functional group tolerance and high atom economy. Moreover
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。