Catalytic Desymmetrizing Intramolecular Heck Reaction: Evidence for an Unusual Hydroxy-Directed Migratory Insertion
作者:Martin Oestreich、Fernando Sempere-Culler、Axel B. Machotta
DOI:10.1002/anie.200460921
日期:2005.1
Oxygen Donor-Mediated Equilibration of Diastereomeric Alkene−Palladium(II) Intermediates in Enantioselective Desymmetrizing Heck Cyclizations
作者:Axel B. Machotta、Bernd F. Straub、Martin Oestreich
DOI:10.1021/ja072571y
日期:2007.11.1
attributed to a temporary interaction of a Lewis basic oxygen donor with weakly Lewis acidic palladium(II). A series of control experiments combined with quantum-chemical model calculations provided sound evidence for a mechanism involving oxygen donor-mediated, rapid equilibration of diastereomeric alkene-palladium(II) complexes prior to the selectivity-determining ring-closing event, a Curtin-Hammett scenario