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Structural Optimization of Enantiopure 2-Cyclialkylamino-2-aryl-1,1-diphenylethanols as Catalytic Ligands for Enantioselective Additions to Aldehydes

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journal contribution
posted on 18.07.2008, 00:00 by Sergi Rodríguez-Escrich, Katamreddy Subba Reddy, Ciril Jimeno, Gisela Colet, Carles Rodríguez-Escrich, Lluís Solà, Anton Vidal-Ferran, Miquel A. Pericàs
The structural optimization of a family of modular, enantiopure β-amino alcohol ligands with a common 2-amino-2-aryl-1,1-diphenylethanol skeleton, whose stereogenicity was introduced through the Jacobsen epoxidation of 1,1-diphenyl-2-arylethylenes, has led to the identification of a small set of optimal catalysts with enhanced activity and enantioselectivity in the addition of alkylzinc and arylzinc reagents to aldehydes. Criteria for the discrimination between apparently analogous, highly enantioselective ligands are proposed.

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