Evidence and exploitation of dicationic ammonium–nitrilium superelectrophiles: direct synthesis of unsaturated piperidinones
Résumé
Exploiting superacid activation, the reactivity of aminonitriles was enhanced through the transient formation of highly reactive ammonium–nitrilium superelectrophiles. Demonstrated by using in situ low-temperature NMR experiments and confirmed by X-ray diffraction analysis, these dications can be intramolecularly trapped by non-activated alkenes to generate unsaturated piperidinones, including enantioenriched ones, in a straightforward way.
Domaines
Chimie organique
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