Selector-Induced Dynamic Deracemization of a Selectand-Modified Tropos BIPHEPO-Ligand: Application in the Organocatalyzed Asymmetric Double-Aldol-Reaction
作者:Frank Maier、Oliver Trapp
DOI:10.1002/anie.201402293
日期:2014.8.11
directing enantioselectivity in asymmetricsynthesis by formation of diastereomeric complexes with chiral auxiliaries and deracemization. However, the stoichiometrically used auxilliaries can significantly limit the potential applications of such systems. We synthesized a new BIPHEPO tropos ligand containing achiral selectands in the backbone, which forms transient diastereomeric associates with amylose‐tris‐3
Symmetry swap: A C2‐chiral spiro diphosphine oxide (SpinPO) has been found to be highly efficient and enantioselective in the catalysis of double‐aldol reactions of ketones and aldehydes to give the corresponding optically active double‐aldol products, which can be readily transformed into optically active C3‐ and pseudo‐C3‐symmetric molecules.