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We report a palladium‐catalyzed intramolecular direct heteroarylation of oxazole tethered β‐naphthols to access corresponding tetracyclic 4H‐benzo[5,6]chromeno[3,4‐d]oxazoles. Various functional groups are well tolerated and furnished the desired products in good to excellent yields under the present reaction conditions. The scale‐up reaction and synthetic utility of the resulting molecules have been demonstrated. Moreover, UV/vis absorption and fluorescence emission properties have been evaluated for these polyheterocyclic compounds. [ABSTRACT FROM AUTHOR]

Synthesis of fused tricyclic oxazolo[4,5‐c]quinolines from 2‐iodo‐N‐((2‐phenyloxazol‐4‐yl)methyl)anilines via intramolecular C−H heteroarylation in the presence of palladium catalyst under ligand free conditions has been disclosed. Various substituted 2‐iodo‐N‐((2‐phenyloxazol‐4‐yl)methyl)anilines are well tolerated and furnished the products in good yields. The synthetic utility of the resulting molecules has been demonstrated. This method features broad substrate scope, mild reaction conditions, good functional group tolerance, and scalability. [ABSTRACT FROM AUTHOR]