Co-Metal-Free Enantioselective Conjugate Addition Reactions of Zinc Reagents
作者:Sefer Ay、Martin Nieger、Stefan Bräse
DOI:10.1002/chem.200801676
日期:——
Asymmetric conjugate addition of diethylzinc to cinnamaldehyde in a co-metal-free fashion by usingN,O-ligands with planar and central chirality is described. Different modulations of the ligand structure, including several combinations of the chiral units, indicate that a [2.2]paracyclophane backbone is essential for the activity and the enantioselectivity of the generated active catalyst. By using