Janardhanan, J.C.James, K.Puthuvakkal, A.Bhaskaran, R.P.Suresh, C.H.Praveen, V.K.Manoj, N.Babu, B.P.2026-02-052019New Journal of Chemistry, 2019, 43, 25, pp. 10166-1017511440546https://doi.org/10.1039/c9nj01991jhttps://idr.nitk.ac.in/handle/123456789/24813A stoichiometry controlled domino cyclization reaction of hydrazone and p-benzoquinone to an angularly fused 3H-benzofuro[3,2-e]indazole core with an embedded oxygenated dibenzofuran framework under mild reaction conditions is disclosed. The reaction involves palladium catalyzed 5-hydroxy-1H-indazole formation followed by TFA mediated [3+2] annulation between the in situ formed 5-hydroxy-1H-indazole and p-benzoquinone. The developed method is attractive because of the concomitant formation of two heterocyclic rings with consecutive multiple bond forming events that include two C-C, one C-N and one C-O bonds. Spectroscopic and theoretical studies of the blue emissive benzofuroindazole derivatives have also been described. © 2019 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.1,4 benzoquinonebenzofuran derivativecarbonhydrazone derivativeindazole derivativenitrogenoxygenannulation reactionArticlecatalysiscovalent bondcyclizationpriority journalspectroscopysynthesis