Multicomponent Synthesis of 1,3-Diketone-Linked <i>N</i>‑Substituted Pyrroles, Pyrrolo[1,2‑<i>a</i>]pyrazines, Pyrrolo[1,4]diazepines, and Pyrrolo[1,4]diazocines

A new methodology is developed for the efficient synthesis of 1,3-diketone-linked N-substituted pyrroles, pyrrolo­[1,2-a]­pyrazines, pyrrolo­[1,4]­diazepines, and pyrrolo­[1,4]­diazocines in good yields via a Yb­(OTf)3-catalyzed, nitromethane-mediated reaction of primary amine/diamine, furfural, and 1,3-diketone. Possible mechanisms for these multicomponent reactions are also proposed