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Lactic acid derived aziridinyl alcohols as highly effective catalysts for asymmetric additions of an organozinc species to aldehydes
Authors:Stanisław Leśniak  Michał Rachwalski  Szymon Jarzyński  Emilia Obijalska
Affiliation:Department of Organic and Applied Chemistry, University of ?ód?, Tamka 12, 91-403 ?ód?, Poland
Abstract:A straightforward synthetic route to a series of new catalysts bearing secondary hydroxyl and aziridine moieties as nucleophilic centers built on the chiral skeleton of (S)-(+)-lactic acid is described. All of the new compounds have been tested in the enantioselective addition of diethyl- and phenylethynylzinc to aryl and alkyl aldehydes, yielding the corresponding chiral alcohols in high chemical yields (up to 85%) and good ee’s of approximately 85%. The influence of the stereogenic center located at the aziridine subunit on the stereochemical outcome is also discussed.
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