C1-Symmetric VersusC2-Symmetric Ligands in Enantioselective Copper–Bis(oxazoline)-Catalyzed Cyclopropanation Reactions
作者:José M Fraile、José I. García、Anja Gissibl、José A. Mayoral、Elísabet Pires、Oliver Reiser、Marta Roldán、Isabel Villalba
DOI:10.1002/chem.200700681
日期:2007.10.26
A thorough experimental and theoretical study of the enantioselective cyclopropanation of alkenes catalyzed by chiralbis(oxazoline)- and azabis(oxazoline)-copper complexes, which comprise a new family of ligands that lack C2 symmetry, has been conducted. Surprisingly high enantioselectivities were observed with some of these ligands, which were rationalized on the basis of molecular modeling studies