Abstract

GUARDADO-CRUZ, Sheila Teresita; ORTIZ-ALVARADO, Rafael; LEON, Claudia de  and  SOLORIO ALVARADO, César R.. Oxidación sin Precedente y Escalable Catalizada por Cobre (I) del Enlace C_sp²-H en el 2-Fenil-1,3-Naftalendiol con Oxígeno Atmosférico: Síntesis de la 2-Hidroxi-3-fenil-1,4-Naftoquinona via Formación Directa del Enlace C_sp²-O. Acta univ [online]. 2017, vol.27, n.5, pp.62-68. ISSN 2007-9621.  https://doi.org/10.15174/au.2017.1337.

The Csp2-O bond formation via direct oxidation of the Csp2-H bond on electron-rich compounds such as naphthols, is a process that generally requires drastic reaction conditions like high temperature or pressure. Addition of strong oxidants as H2O2, hypervalent iodine reagents (λ3 o λ5), expensive transition metals or rare earth elements, such as Mo, Ru Pt or Ce, is usually necessary. As part of this study on oxidative dimerization of phenols towards the total synthesis of ningalin D, 1,3-naphthalenediol was explored as starting material using stoichiometric amounts of Cu(I) and atmospheric molecular oxygen. A novel two-step sequence reaction for the formation of a 1,4-naphthoquinone was found instead of a dimerization product. The synthesis of this compound involves two consecutive oxidation processes.

Keywords : Oxidation of naphthol; oxidative dimerization of phenols; 1,4-naphthoquinone; ningalin D.