A synthetic route to derive the skeleton of naphthalenes starting with isovanillin is described with modest total yields via the key transformation of metal triflate-mediated intramolecular benzannulation of o-formyl or o-benzoyl allylbenzenes in MeNO2 at rt.
C. Chan, H. Wang, Y. Tsai and M. Chang, RSC Adv., 2017, 7, 29321 DOI: 10.1039/C7RA04960A
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