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Synthesis of Pyrrolo[1,2‐a]quinolines and Ullazines by Visible Light mediated one‐ and twofold Annulation of N‐Arylpyrroles with Arylalkynes

Das, Amrita ; Ghosh, Indrajit ; König, Burkhard


1-(2-Bromophenyl)-1H-pyrrole and 1-(2,6-dibromophenyl)-1H-pyrrole react in the presence of catalytic amounts of rhodamine 6G (Rh-6G) and N,N-diisopropylethylamine (DIPEA) under blue light irradiation with aromatic alkynes and subsequently cyclize intramolecularly to form pyrrolo[1,2-a]quinoline and ullazines. The reactions proceed at room temperature, avoid transition metal catalysts, and ...


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