Au<sup>I</sup>-catalyzed cycloisomerization of 1,5-enynes bearing a propargylic acetate: formation of unexpected bicyclo[3.1.0]hexene
作者:Nicolas Marion、Pierre de Frémont、Gilles Lemière、Edwin D. Stevens、Louis Fensterbank、Max Malacria、Steven P. Nolan
DOI:10.1039/b602839j
日期:——
The use of N-heterocyclic carbene (NHC) as a ligand in the gold(I)-catalyzed cycloisomerization of enyne results in the assembly of a new carbocyclic product.
The platinum- and gold-catalyzedcycloisomerization of enyne systems has been carried out in various ionic liquids (ILs). In some cases, better selectivities and shorter reaction times have been observed compared to conventional conditions.
The Effect of a Hydroxy Protecting Group on the PtCl2-Catalyzed Cyclization of Dienynes—A Novel, Efficient, and Selective Synthesis of Carbocycles Acknowledgement is made to the EU for the COST D12 Action “Cascade Free Radical Reactions” and for a short-term scientific mission to Madrid (EM). We thank Nieves Arroyo (CSIC) for preliminary experiments, Dr. J. Vaissermann (UPMC) for the X-ray analysis of 3 e, Dr. M. L. Jimeno (CNQO) for NMR studies on 3 a, Dr. M.-N. Rager (ENSCP) for NMR studies on 3 h, 6, and 11, and Matthieu Bernard (UPMC) for performing some of the experiments. We also thank Dr. Emmanuel Lacôte and Dr. Henri Rudler (UPMC) for helpful discussions.