An Efficient Synthesis of Pyrrolo[1,2- a] or Pyrido[1,2- a]benzo[4,5]imidazo[1,2- c]quinazoline Derivatives in Ionic Liquids Catalyzed by Iodine.

2-(1 H-benzo[ d]imidazol-2-yl)anilines reacted with haloketones including 5-chloropentan-2-one and 6-chlorohexan-2-one catalyzed by iodine, giving benzo[4,5]imidazo[1,2- c]pyrrolo[1,2- a]quinazoline and 6 H-benzo[4,5]imidazo[1,2- c]pyrido[1,2- a]quinazoline derivatives, respectively. This domino-type reaction formed two new heterocycles and three new covalent bonds in one-pot procedure and provided a green method for the synthesis of fused pentacyclic heterocycles bearing both quinazoline and benzimidazole moieties in ionic liquids. [ABSTRACT FROM AUTHOR]