Ambivalent role of metal chlorides in ring opening reactions of 2H-azirines: synthesis of imidazoles, pyrroles and pyrrolinones
作者:Sergio Auricchio、Ada M. Truscello、Mirvana Lauria、Stefano V. Meille
DOI:10.1016/j.tet.2012.06.069
日期:2012.9
the presence of metal salts. Imidazoles, pyrroles and new pyrrolinones derivatives are isolated in good overall yields. The role of metal salts was investigated as they can act as Lewis acids or electron donors. Mechanisms are proposed suggesting that imidazoles arise from addition of azirine to imines via radical or ionic mechanism; pyrroles and pyrrolinones are obtained from azirines with enamino
Domino transformation of isoxazoles to 2,4-dicarbonylpyrroles under Fe/Ni relay catalysis
作者:Ekaterina E. Galenko、Alexey V. Galenko、Alexander F. Khlebnikov、Mikhail S. Novikov
DOI:10.1039/c5ra01889g
日期:——
The domino reaction of 5-alkoxy- or 5-aminoisoxazoles, under metal relay catalysis, with symmetric 1,3-diketones gives 4-acylpyrrole-2-carboxylic acid derivatives in high yield.