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A direct strategy for the preparation of fused thienoindoles from substituted indoles and elemental sulfur has been reported. The present approach produces a range of structurally valuable fused thienoindoles in 51–78% yield under transition‐metal‐free conditions, which may have potential applications in pharmaceutical industry and organic functional materials. In this work, the double C−S bonds formation is achieved via base promoted direct sulfuration of C−H bonds with elemental sulfur. [ABSTRACT FROM AUTHOR]

Fe‐catalyzed three‐component strategy have been developed for the synthesis of 2,3′‐biquinolines from readily available 2‐methyl quinolines, anthranils and N, N‐dimethylacetamide (DMA), This annulation procedure undergoes C(sp3)−H activation, amination, nucleophilic addition, dehydration and oxydehydrogenation steps. DMA acts not only as a solvent but also as a one carbon donor in the reaction. [ABSTRACT FROM AUTHOR]

A metal‐ and solvent‐free strategy for the preparation of maleimide‐fused carbazoles has been developed. This protocol started from 2‐(indol‐3‐yl)cyclohexanones and maleimides, providing various maleimide‐fused carbazoles in 45–90% yields. The present approach was catalyzed by trimethylsulfoxonium iodide and involved a cascade of oxidation, [4+2] annulation, and dehydrogenative aromatization. Moreover, these maleimide‐fused carbazole products could be further transformed into other polycyclic aromatic hydrocarbons. [ABSTRACT FROM AUTHOR]