Employ bifunctional catalysts that combine a base and a Lewis acid component. These catalysts can activate both the electrophilic and nucleophilic components of the reaction, enhancing its selectivity. For instance, chiral diamines or amine-urea catalysts have been used effectively in aza-Claisen rearrangements.
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N-((S)-1-phenylethyl)-(2S,3S)-2,3-dimethylpent-4-enamide
(S)-3-[3-(4-chlorobenzylthio)butanoyl]oxazolidin-2-one
C12H10Cl3NO2
Benzylidenemalononitrile
