Gold(I)-Catalyzed Conia-Ene Reaction of β-Ketoesters with Alkynes
摘要:
The intramolecular addition of beta-ketoesters to unactivated alkynes under neutral conditions and at room temperature is described. The method employs triphenylphosphinegold(I) cation as a catalyst for the formation of exo-methylenecycloalkanes. Both monocyclic and bicyclic cyclopentanes and cyclohexanes can be formed in excellent yields and with good diastereoselectivity.
Cobalt-mediated cycloisomerization of δ-substituted ε-acetylenic β-ketoesters construction of angular triquinane by a sequence ene/Pauson-Khand reactions
作者:Jean-Luc Renaud、Corinne Aubert、Max Malacria
DOI:10.1016/s0040-4020(99)00172-6
日期:1999.4
The preparation of δ-substituted ε-acetylenic β-ketoesters is fully described. Their cobalt-mediated Conia-ene reactions led to variously functionalized methylenecyclopentanes in high yields and with a moderate control of the 1,4 diastereoselectivity. A sequence involving the cobalt-mediated ene and Pauson-Khand reactions is presented and allowed the construction of the angular triquinane framework
Gold(I)-Catalyzed Conia-Ene Reaction of β-Ketoesters with Alkynes
作者:Joshua J. Kennedy-Smith、Steven T. Staben、F. Dean Toste
DOI:10.1021/ja049487s
日期:2004.4.1
The intramolecular addition of beta-ketoesters to unactivated alkynes under neutral conditions and at room temperature is described. The method employs triphenylphosphinegold(I) cation as a catalyst for the formation of exo-methylenecycloalkanes. Both monocyclic and bicyclic cyclopentanes and cyclohexanes can be formed in excellent yields and with good diastereoselectivity.