that the synthesis of stereodefined 1,3-enynes featuring a trisubstituted olefin is achieved by merging alkynes, alkynyl bromides, and redox-active N-(acyloxy)phthalimides through nickel-catalyzed reductive alkylalkynylation. Products are generated in up to an 89% yield as single regio- and E isomers. Transformations are tolerant of diverse functional groups and the resulting 1,3-enynes are amenable
Deoxygenative C2-heteroarylation of quinoline <i>N</i>-oxides: facile access to α-triazolylquinolines
作者:Geetanjali S Sontakke、Rahul K Shukla、Chandra M R Volla
DOI:10.3762/bjoc.17.42
日期:——
A metal- and additive-free, highly efficient, step-economical deoxygenative C2-heteroarylation of quinolines and isoquinolines was achieved from readily available N-oxides and N-sulfonyl-1,2,3-triazoles. A variety of α-triazolylquinoline derivatives were synthesized with good regioselectivity and in excellent yields under mild reaction conditions. Further, a gram-scale and one-pot synthesis illustrated
Rh-Catalyzed Transannulation of <i>N</i>-Tosyl-1,2,3-Triazoles with Terminal Alkynes
作者:Buddhadeb Chattopadhyay、Vladimir Gevorgyan
DOI:10.1021/ol2014347
日期:2011.7.15
The first transannulation of 1,2,3-triazoles with terminal alkynes into pyrroles is reported. The reaction proceeds in the presence of a Rh2(oct)4/AgOCOCF3 binary catalyst system providing a straightforward approach to 1,2,4-trisubstituted pyrroles in good to excellent yields.
Metal-Free Markovnikov-Type Alkyne Hydration under Mild Conditions
作者:Wenbo Liu、Haining Wang、Chao-Jun Li
DOI:10.1021/acs.orglett.6b00801
日期:2016.5.6
presented using 20% CF3SO3H (TfOH) as the catalyst under unprecedented mildconditions applicable to various alkynes, including terminal arylalkynes, terminal nonfunctionalized aliphatic alkynes, and internal alkynes with excellent regioselectivity in good to excellent yields (average yields >85%). The reaction procedure operates undermildconditions (25–70 °C), with broad functional group compatibility
提出了使用20%CF 3 SO 3 H(TfOH)作为催化剂的Markovnikov型炔烃水合方案,该催化剂在前所未有的温和条件下适用于各种炔烃,包括端基芳基炔烃,端基非官能化脂肪族炔烃和内部炔烃,具有出色的区域选择性,对优异的产量(平均产量> 85%)。该反应程序在温和的条件下(25–70°C)进行,具有广泛的官能团相容性,并且在没有任何过渡金属的情况下仅使用比化学计算量的水稍多的水。该协议的成功取决于使用三氟乙醇作为溶剂。
Acyl Radicals from Terminal Alkynes: Photoredox-Catalyzed Acylation of Heteroarenes
作者:Shaista Sultan、Masood Ahmad Rizvi、Jaswant Kumar、Bhahwal Ali Shah
DOI:10.1002/chem.201801628
日期:2018.7.25
A photoredox‐mediated acylation reaction of electron deficient heteroarenes with terminalalkynes is reported. The method relies on oxidative cleavage of phenylacetylenes for generation of acylradicals as a key enabling feature. The reaction is regioselective with broad substrate scope. Quantum yield investigations support a radical chain mechanism.