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C1-Symmetric Versus C2-Symmetric Ligands in Enantioselective Copper- Bis(oxazoline)-Catalyzed Cyclopropanation Reactions

Fraile, José M. ; Garcia, José I. ; Gissibl, Anja ; Mayoral, José A. ; Pires, Elísabet ; Reiser, Oliver



Abstract

A thorough experimental and theoretical study of the enantioselective cyclopropanation of alkenes catalyzed by chiral bis(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 ...

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