Preparation and Characterization of Two New N-Heterocyclic Carbene Gold(I) Complexes and Comparison of Their Catalytic Activity to Au(IPr)Cl

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• 作者：Benjamin W. Gung ; Lauren N. Bailey ; Derek T. Craft ; Charles L. Barnes ; Kristin Kirschbaum
• 刊名：Organometallics
• 出版年：2010
• 出版时间：August 9, 2010
• 年：2010
• 卷：29
• 期：15
• 页码：3450-3456
• 全文大小：959K
• 年卷期：v.29,no.15(August 9, 2010)
• ISSN：1520-6041

文摘

Gold catalysts with N-heterocyclic carbene ligands have become an attractive tool for organic synthesis. Two new gold complexes (9, 11) are prepared and their structures are determined by X-ray structural analysis. Their catalytic activities have been studied with a new intramolecular cyclopropanation reaction starting from the propargyl esters tethered to a terminal alkene. Although no or low enantioselectivity was observed with 9 or 11, the insight gained from this study is the importance of the steric effects of the NHC ligand.