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The oxidation of a series of N -acetyl amino acid methyl esters with H 2 O 2 catalyzed by a very simple iminopyridine iron(ii) complex 1 easily obtainable in situ by self-assembly of 2-picolylaldehyde, 2-picolylamine, and Fe(OTf) 2 was investigated. Oxidation of protected aliphatic amino acids occurs at the α-C-H bond exclusively ( N -AcAlaOMe) or in competition with the side-chain functionalization ( N -AcValOMe and N -AcLeuOMe). N -AcProOMe is smoothly and cleanly oxidized with high regioselectivity affording exclusively C-5 oxidation products. Remarkably, complex 1 is also able to catalyze the oxidation of the aromatic N -AcPheOMe. A marked preference for the aromatic ring hydroxylation over Cα-H and benzylic C-H oxidation was observed, leading to the clean formation of tyrosine and its phenolic isomers.

rsc advances

Oxidative functionalization of aliphatic and aromatic amino acid derivatives with H<sub>2</sub>O<sub>2</sub> catalyzed by a nonheme imine based iron complex

Oxidative functionalization of aliphatic and aromatic amino acid derivatives with H2O2 catalyzed by a nonheme imine based iron complex

Oxidative functionalization of aliphatic and aromatic amino acid derivatives with H₂O₂ catalyzed by a nonheme imine based iron complex