<i>N</i>,<i>N</i>‑Dimethylformamide as Carbon Synthons for the Synthesis of <i>N</i>‑Heterocycles: Pyrrolo/Indolo[1,2‑<i>a</i>]quinoxalines and Quinazolin-4-ones

<i>N</i>,<i>N</i>-dimethylformamide (DMF) as synthetic precursors contributing especially the methyl, acyl, and amino groups has played a significant role in heterocycle syntheses and functionalization. In this protocol, a wide range of pyrrolo/indolo­[1,2-<i>a</i>]­quinoxalines and quinazolin-4-ones were obtained in moderate to good yields by using elemental iodine without any metal or peroxides. We considered that <i>N</i>-methyl and <i>N</i>-acyl of DMF participate and complete the reaction separately through different mechanisms, which displayed potential still to be explored of DMF.