Enaminone ligand-assisted homo- and cross-coupling of terminal alkynes under mild conditions
摘要:
Copper-catalyzed oxidative coupling reactions of terminal alkynes have been performed at room temperature by using enaminone as effective ligand. Both symmetrical and unsymmetrical 1,3-diynes bearing various functional groups have been synthesized in moderate to excellent yields via homo- and cross-coupling reactions. (C) 2013 Elsevier Ltd. All rights reserved.
Copper porphyrin-catalyzed Glaser–Hay-type couplings of terminal alkynes generating 1,3-diynes are described. This reaction features high TON (up to 950) and is complete in an hour, providing a facile, clean, and efficient protocol to access various 1,3-diynes including those with functional groups under mild reaction conditions. This transformation would take place via a radical process.
Highly efficient synthesis of unsymmetrical 1,3-diynes from organoalane reagents and alkynyl bromides mediated by a nickel catalyst
作者:Song Mo、Xue-Bei Shao、Gang Zhang、Qing-Han Li
DOI:10.1039/c7ra02758c
日期:——
Highlyefficient and simple cross-coupling reactions of alkynylbromides with organoalane reagents for the synthesis of unsymmetrical 1,3-diynes derivatives using Ni(OAc)2 (2–5 mol%)/(o-furyl)3P (4–10 mol%) as a catalyst are reported. Excellent yields (up to 94%) were obtained for a wide range of substrates at rt or 60 °C for 2–3 h in Et2O or toluene.