Cyclocondensation of Acylketene S,N- and N,N-acetals with Maleic Anhydride and Maleimide: A Facile One-Step Synthesis of Pyranopyrrole, Pyrrolopyridine and Condensed Pyrrole Derivatives

Article abstract of DOI:10.1055/s-1988-27544

The acylketene S,N-acetals 1a-c react with maleic anhydride (2) in refluxing acetonitrile to give the corresponding 3-pyrrolin-2-one-3-acetic acid derivatives 3a-c in good yields.Condensation of S,N-acetals 1a-j and 2 in presence of acetic anhydride direc