Dearomative\nTransformation of Pyridin-3-ols into 2,3,6,7-Tetrahydro‑1<i>H</i>‑2,6-methanobenzo[<i>d</i>]azonin-12-ones\nvia Oxidopyridinium/<i>o</i>‑Quinodimethane (5 +\n4) Cycloaddition

We report the dearomative transformation of pyridin-3-ols\nvia oxidopyridinium\n(5 + 4) cycloaddition with <i>o</i>-quinodimethanes, leading\nto 2,3,6,7-tetrahydro-1<i>H</i>-2,6-methanobenzo[<i>d</i>]azonin-12-ones. The chemoselective derivatization of the\nobtained cycloadduct was also investigated to demonstrate the synthetic\npotential of the obtained cycloadduct.