Synthesis and Crystallographic Characterization of Chiral Bis-oxazoline-amides. Fine-Tunable Ligands for Pd-Catalyzed Asymmetric Alkylations
作者:Vincenzo Giulio Albano、Marco Bandini、Magda Monari、Eleonora Marcucci、Fabio Piccinelli、Achille Umani-Ronchi
DOI:10.1021/jo060767v
日期:2006.8.1
New chiral chelating C-2 bis-oxazoline-amide ligands (1) exhibiting a highly flexible molecular structure have been prepared in high yield through a versatile synthetic pathway. Combined crystallographic, variable temperature (VT)-NMR, IR, and ESI-MS studies have been carried out to investigate the nature of the 1-Pd complexes that are effective tools in controlling the stereochemical outcome of Pd-catalyzed allylic alkylations (ee up to 98%).