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An unprecedented and efficient molecular iodine promoted domino protocol for the synthesis of  N  polycyclic pyrido[2′,1′:2,3]imidazo[4,5-c]quinolines were reported from phenylacetic acid and 2-(imidazoheteroaryl)anilines. This methodology was also extended for the preparation of benzo[4′,5′]thiazolo [2′,3′:2,3]imidazo[4,5- c ]isoquinolines in good yields. However, this protocol proceeds  via  a sequential decarboxylation of phenylacetic acid with I 2 /DMSO system followed by Pictet-Spengler cyclization in good yields.

Iodine promoted synthesis of pyrido[2′,1′:2,3]imidazo[4,5-c]quinoline derivatives via oxidative decarboxylation of phenylacetic acid