Gold(I)-Catalyzed Intramolecular [4+2] Cycloadditions of Arylalkynes or 1,3-Enynes with Alkenes: Scope and Mechanism
作者:Cristina Nieto-Oberhuber、Patricia Pérez-Galán、Elena Herrero-Gómez、Thorsten Lauterbach、Cristina Rodríguez、Salomé López、Christophe Bour、Antonio Rosellón、Diego J. Cárdenas、Antonio M. Echavarren
DOI:10.1021/ja075794x
日期:2008.1.1
The cyclizations of enynes substituted at the alkyne gives products of formal [4+2] cyclization with Au(I) catalysts. 1,8-Dien-3-ynes cyclize by a 5-exo-dig pathway to form hydrindanes. 1,6-Enynes with an aryl ring at the alkyne give 2,3,9,9a-tetrahydro-1H-cyclopenta[b]naphthalenes by a 5-exo-dig cyclization followed by a Friedel-Crafts-type ring expansion. A 6-endo-dig cyclization is also observed
The skeletal rearrangement as well as the hydroxy- and methoxycyclization of 1,7-enynes proceeds at room temperature with cationic gold(I) catalysts.
1,7-烯炔的骨架重排以及羟基和甲氧基环化反应可以在室温下使用阳离子金(I)催化剂进行。
Ruthenium-Catalyzed Cycloisomerizations of 1,6- and 1,7-Enynes
作者:Barry M. Trost、F. Dean Toste
DOI:10.1021/ja993401r
日期:2000.2.1
Mechanistic Dichotomy in CpRu(CH<sub>3</sub>CN)<sub>3</sub>PF<sub>6</sub> Catalyzed Enyne Cycloisomerizations
作者:Barry M. Trost、F. Dean Toste
DOI:10.1021/ja012450c
日期:2002.5.1
Enynes are easily accessible building blocks as a result of the rich chemistry of alkynes and thus represent attractive substrates for ring formation. A ruthenium catalyst for cycloisomerization effects such reaction of 1,6- and 1,7-enynes typically at room temperature in acetone or DMF under neutral conditions. The reaction is effective for forming five- and six-membered rings of widely divergent