Influence of Bases and Ligands on the Outcome of the Cu(I)-Catalyzed Oxidative Homocoupling of Terminal Alkynes to 1,4-Disubstituted 1,3-Diynes Using Oxygen as an Oxidant
The efficient Cu(I)-catalyzed oxidative homocoupling of terminal alkynes in the presence of a base using an amine as a ligand and oxygen as an oxidant yields the symmetrical 1,3-diynes with yields of up to 99%. The outcome of the couplings critically depends on the proper choice of base and ligand a...
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| Published in | Journal of organic chemistry Vol. 74; no. 15; pp. 5648 - 5651 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Washington, DC
American Chemical Society
07.08.2009
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0022-3263 1520-6904 1520-6904 |
| DOI | 10.1021/jo900246z |
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| Abstract | The efficient Cu(I)-catalyzed oxidative homocoupling of terminal alkynes in the presence of a base using an amine as a ligand and oxygen as an oxidant yields the symmetrical 1,3-diynes with yields of up to 99%. The outcome of the couplings critically depends on the proper choice of base and ligand as well as reaction conditions. Best results were observed with 2.0 mol % CuCl, 1.5 mol % TMEDA or DBEDA, and DBU or DABCO in acetonitrile. |
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| AbstractList | The efficient Cu(I)-catalyzed oxidative homocoupling of terminal alkynes in the presence of a base using an amine as a ligand and oxygen as an oxidant yields the symmetrical 1,3-diynes with yields of up to 99%. The outcome of the couplings critically depends on the proper choice of base and ligand as well as reaction conditions. Best results were observed with 2.0 mol % CuCl, 1.5 mol % TMEDA or DBEDA, and DBU or DABCO in acetonitrile. The efficient Cu(I)-catalyzed oxidative homocoupling of terminal alkynes in the presence of a base using an amine as a ligand and oxygen as an oxidant yields the symmetrical 1,3-diynes with yields of up to 99%. The outcome of the couplings critically depends on the proper choice of base and ligand as well as reaction conditions. Best results were observed with 2.0 mol % CuCl, 1.5 mol % TMEDA or DBEDA, and DBU or DABCO in acetonitrile.The efficient Cu(I)-catalyzed oxidative homocoupling of terminal alkynes in the presence of a base using an amine as a ligand and oxygen as an oxidant yields the symmetrical 1,3-diynes with yields of up to 99%. The outcome of the couplings critically depends on the proper choice of base and ligand as well as reaction conditions. Best results were observed with 2.0 mol % CuCl, 1.5 mol % TMEDA or DBEDA, and DBU or DABCO in acetonitrile. |
| Author | Beifuss, Uwe Malakar, Chandi C Adimurthy, Subbarayappa |
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| Keywords | 1,8-Diazabicyclo[5.4.0]undec-7-ene Catalytic reaction Acetylenic compound Nitrogen heterocycle Ligand Chemical base Copper complex Copper I Chlorides Oxidant Chemical coupling Amine Acetonitrile Copper I Oxidation Homocoupling Diynic compound Alkyne |
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| SubjectTerms | Catalysis Catalysts: preparations and properties Chemistry Exact sciences and technology General and physical chemistry Kinetics and mechanisms Organic chemistry Reactivity and mechanisms Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| Title | Influence of Bases and Ligands on the Outcome of the Cu(I)-Catalyzed Oxidative Homocoupling of Terminal Alkynes to 1,4-Disubstituted 1,3-Diynes Using Oxygen as an Oxidant |
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