Efficient Copper(II) Acetate Catalyzed Homo- and Heterocoupling of Terminal Alkynes at Ambient Conditions
作者:Venkitasamy Kesavan、Kaluvu Balaraman
DOI:10.1055/s-0030-1258199
日期:2010.10
in quantitative yields using the copper(II) acetate catalyzed homocoupling of terminalalkynes in the presence of a stoichiometric amount of piperidine at 25 ˚C under aerobic conditions. We also accomplished facile syntheses of unsymmetric 1,3-diynes by heterocouplingterminalalkynes in very good yields under the reported reaction conditions. terminalalkynes - copper(II) acetate - piperidine - homocoupling
Alkynylcopper(i) polymers and their use in a mechanistic study of alkyne–azide click reactions
作者:Benjamin R. Buckley、Sandra E. Dann、Daniel P. Harris、Harry Heaney、Emma C. Stubbs
DOI:10.1039/b924649e
日期:——
Polymeric dinuclear alkynylcopper(I) complexes, for example phenylethynylcopper(I), can be prepared by a robust method involving the interaction of terminal alkynes with copper(II) salts in acetonitrile. The use of the ladder polymers provides heterogeneous catalysts for copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions and provides important mechanistic information.
A facile and environmentally friendly synthetic method for a variety of symmetrical 1,3-diyne derivatives based on the Pd/C-CuI-catalyzed homocoupling reaction of terminal alkynes has been developed. The reaction was efficiently catalyzed by the extremely low loading (0.01-0.03 mol%) of Pd/C and CuI (3 mol%) in the presence of molecular oxygen (O2) as an oxidant without any phosphine ligands and bases.
respect to their reactivity toward topochemicalpolymerization in the crystalline state. The 1:1 cocrystal 4.5 was successfully polymerized to the corresponding poly(diacetylene) copolymer 7, as evidenced by solid-state (13)C NMR and Raman spectroscopy, as well as single-crystal structure analysis of the monomer-polymer cocrystal. Thus, perfluorophenyl-phenylinteractions were utilized as complementary
A Photocatalyzed Synthesis of Naphthalenes by Using Aniline as a Traceless Directing Group in [4 + 2] Annulation of Amino-benzocyclobutenes with Alkynes
作者:Qile Wang、Nan Zheng
DOI:10.1021/acscatal.7b00716
日期:2017.6.2
We report a visible-light-promoted synthesis of substituted naphthalenes via [4 + 2] annulation of amino-benzocyclobutenes with alkynes. Amino-benzocyclobutenes, which are conveniently synthesized by [2 + 2] cycloaddition of arynes with ketenes followed by reductive amination, undergo regioselective opening of the cyclobutenyl ring to reveal a presumably distonic radical cation upon photooxidation