文摘
2-Chloro-3-formyl quinoline has been applied as an aldehyde moiety in the Groebke–Blackburn–Bienaymé multi-component reaction with isocyanides, 2-aminoazines, and 2-aminoazole to afford the desired adducts which are amenable for further cyclization on the basis of Ullmann-type coupling. The copper iodide-mediated intramolecular C–N bond formation in the second step gave an easy access to a series of imidazo[4\('\),5\('\):4,5]pyrrolo[2,3-b]quinoline derivatives in moderate to good yields. Keywords Isocyanide-based multi-component reaction (IMCR) Ullmann-type reaction Copper-mediated Polycyclic heterocycles 2-Chloro-3-formyl-quinoline