Transition‐Metal‐Free (Hetero)arylsulfonylation of 1‐Iodopyrrolo[1,2‐a]quinoxalines

We describe herein a method for transition‐metal‐free (hetero)arylsulfonylation of 1‐iodopyrrolo[1,2‐ a ]quinoxalines with sodium arylsulfinates. The corresponding aryl iodides were in situ prepared from eletrophilic iodination of C1−H bonds in pyrrolo[1,2‐ a ]quinoxalines with N ‐iodosuccinimide. The ensuing sulfonylation only required DMSO as solvent and completed after 15 min. Many arylsulfinates bearing chloro, bromo, methylsufonyl, acetamide, and nitro groups were competent substrates. Heteroarylsulfonylation of pyrrolo[1,2‐ a ]quinoxalines were also feasible.