Ion-pairing catalysis in the enantioselective addition of hydrazones to <i>N</i>-acyldihydropyrrole derivatives
作者:Nagore Zabaleta、Uxue Uria、Efraim Reyes、Luisa Carrillo、Jose L. Vicario
DOI:10.1039/c8cc05311a
日期:——
demonstrated that dihydropyrrole-based enamide derivatives can act as efficient precursors of chiral quaternary N-acyliminium salts under Brønsted acid catalysis that undergo reactions with hydrazones, the latter participating as masked nucleophilic carbonyl group equivalents. The optimized methodology provides a variety of enantiopure α-substituted proline derivatives in excellent yields, being even compatible