Gold(I)-Catalyzed Intramolecular Cyclopropanation of Dienynes
作者:Cristina Nieto-Oberhuber、Salomé López、M. Paz Muñoz、Eloísa Jiménez-Núñez、Elena Buñuel、Diego J. Cárdenas、Antonio M. Echavarren
DOI:10.1002/chem.200501089
日期:2006.2.8
Gold(I) complexes are the most active catalysts for the biscyclopropanation of dienynes to form tetracyclic compounds. PtII and ZnII are also able to promote the biscyclopropanation, although less efficiently. The configurations obtained in all cases with the use of gold(I) catalysts can be explained by the pathway proceeding through anti cyclopropyl goldcarbenes. Similar intermediates are most probably