Direct, Stereoselective Substitution in [Rh(CO)<sub>2</sub>Cl]<sub>2</sub>-Catalyzed Allylic Alkylations of Unsymmetrical Substrates
作者:Brandon L. Ashfeld、Kenneth A. Miller、Stephen F. Martin
DOI:10.1021/ol0496529
日期:2004.4.1
[Rh(CO)(2)Cl](2) has been found to possess the unusual property of catalyzing allylicalkylations of unsymmetrical allylic carbonates with high levels of regioselectivity to provide products arising from substitution at the carbon atom bearing the leaving group, irrespective of the structure of the starting carbonate. The substitution reaction occurs with retention of stereochemistry at the reacting
Features and Applications of [Rh(CO)<sub>2</sub>Cl]<sub>2</sub>-Catalyzed Alkylations of Unsymmetrical Allylic Substrates
作者:Brandon L. Ashfeld、Kenneth A. Miller、Anna J. Smith、Kristy Tran、Stephen F. Martin
DOI:10.1021/jo701290b
日期:2007.11.1
A novel regio- and stereoselective [Rh(CO)2Cl]2-catalyzed allylic alkylation of unsymmetrical allylic carbonates was discovered. The regioselectivity of the reaction favors product ratios in which substitution occurs at the carbon bearing the leaving group. When an enantiomerically enriched carbonate (≥99% ee) was examined, the Rh(I)-catalyzed allylic alkylation proceeded stereoselectively to provide