Abstract
Tyrosinase catalyzes the ortho hydroxylation of monophenols and the subsequent oxidation of the diphenolic products to the resulting quinones. In efforts to create biomimetic copper complexes that can oxidize C–H bonds, Stack and coworkers recently reported a synthetic μ-η2:η2-peroxodicopper(II)(DBED)2 complex (DBED is N,N′-di-tert-butylethylenediamine), which rapidly hydroxylates phenolates. A reactive intermediate consistent with a bis-μ-oxo-dicopper(III)-phenolate complex, with the O–O bond fully cleaved, is observed experimentally. Overall, the evidence for sequential O–O bond cleavage and C–O bond formation in this synthetic complex suggests an alternative mechanism to the concerted or late-stage O–O bond scission generally accepted for the phenol hydroxylation reaction performed by tyrosinase. In this work, the reaction mechanism of this peroxodicopper(II) complex was studied with hybrid density functional methods by replacing DBED in the μ-η2:η2-peroxodicopper(II)(DBED)2 complex by N,N′-dimethylethylenediamine ligands to reduce the computational costs. The reaction mechanism obtained is compared with the existing proposals for the catalytic ortho hydroxylation of monophenol and the subsequent oxidation of the diphenolic product to the resulting quinone with the aim of gaining some understanding about the copper-promoted oxidation processes mediated by 2:1 Cu(I)O2-derived species.
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Acknowledgments
Financial help was furnished by the Spanish Ministerio de Educación y Ciencia (MEC) projects no. CTQ2005-08797-C02-01/BQU and CTQ2008-03077/BQU and by the Catalan Departament d’Universitats, Recerca i Societat de la Informació (DURSI) of the Generalitat de Catalunya project no. 2005SGR-00238. We thank Miquel Costas for valuable discussions and the reviewers for helpful comments. M.G. thanks the Spanish MEC for a Ph.D. grant.
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Güell, M., Luis, J.M., Solà, M. et al. Theoretical study of the hydroxylation of phenolates by the Cu2O2(N,N′-dimethylethylenediamine)2 2+ complex. J Biol Inorg Chem 14, 229–242 (2009). https://doi.org/10.1007/s00775-008-0443-y
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DOI: https://doi.org/10.1007/s00775-008-0443-y