Bicyclic Cyclopentenones via the Combination of an Iridium- Catalyzed Allylic Substitution with a Diastereoselective Intramolecular Pauson-Khand Reaction
作者:Andreas Farwick、Jens U. Engelhart、Olena Tverskoy、Carolin Welter、Quendolin A. Umlauf née Stang、Frank Rominger、William J. Kerr、Günter Helmchen
DOI:10.1002/adsc.201000706
日期:2011.2.11
Enantioselectivesyntheses of bicyclic cyclopentenones are described. Key steps are an iridium-catalyzedallylicsubstitution and an intramolecular diastereoselective Pauson–Khand reaction. The diastereoselectivity of the Pauson–Khand reaction was found to be crucially dependent on the unit connecting the propargylic and the olefinic parts of the precursor. Very high degrees of diastereoselection were