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DOI: 10.1055/s-0030-1260526
Origins of Enantioselectivity in Proline-Catalyzed Friedländer Condensations of 4-Substituted Cyclohexanones
Publication History
Publication Date:
27 May 2011 (online)

Abstract
Computational studies reveal the origin of the enantioselectivity in proline-catalyzed Friedländer condensations of 4-substituted cyclohexanones with aminobenzaldehydes. Both the catalyst structure and the nature of the substituent on cyclohexanone play important roles in this desymmetrization process. The model presented herein provides a satisfying explanation for the vastly different selectivities that are observed for 4-phenylcyclohexanone versus 4-(tert-butyldimethylsilyloxy)cyclohexanone.
Key words
Friedländer synthesis - quinolines - amino aldehydes - organocatalysis - proline
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The predicted enantiomeric excesses were determined by converting the differences in the calculated gas-phase free energies of activation, ΔΔG 298, into % ee using absolute rate theory: ln(k 1/k 2) = -eΔΔ G / RT .
21Li, L.; Seidel, D. unpublished results.