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Wiley, European Journal of Organic Chemistry, 24(2013), p. 5262-5265, 2013

DOI: 10.1002/ejoc.201300899

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Asymmetric Organocatalytic Benzylation of α,β‐Unsaturated Aldehydes with Toluenes

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The direct organocatalytic enantioselective benzylation by using toluenes and α,β-unsaturated aldehydes is presented. The reaction is catalyzed by tert-butyldimethylsilyl-protected diphenylprolinol in the presence of a mild organic base and proceeds with excellent yields and enantioselectivities up to >99 % ee. This reactivity is based on a synergistic effect between the iminium ion intermediate and the base-activated toluene. Toluene derivatives having various electron-withdrawing substituents were also applied in this unprecedented transformation. The synthetic potential is demonstrated by manipulations of the products to, for example, biologically active phenylbenzazepines.