Rh-Catalyzed Aqueous Pauson-Khand-Type Cycloaddition in Microwave-Irradiated Medium
作者:Fuk Kwong、Albert Chan、Hang Lee
DOI:10.1055/s-2008-1078413
日期:2008.6
Microwave-assisted Rh-catalyzed dual catalysis in aqueous medium is described. This tandem process transforms the enyne to cycloadduct by cascade decarbonylation of formate ester and subsequently carbonylation of enyne under microwave-irradiated conditions.
A novel rhodium-catalyzed asymmetric intramolecular Pauson–Khandreaction using a chiral monophosphoramidite ligands is described. In this reaction, an in situ generated catalyst from [Rh(CO)2Cl]2, the spiro-monophosphoramidite ligand SIPHOS and AgSbF6 was found to be effective for a series of 1,6-enynes, providing the co-cyclization products in good enantioselectivities (84% ee).