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Issue 11, 2011
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Iron oligopyridine complexes as efficient catalysts for practical oxidation of arenes, alkanes, tertiary amines and N-acyl cyclic amines with Oxone

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Abstract

The iron complexes [Fe(qpy)](ClO4)2 (1) (qpy = 2, 2′ : 6′, 2′′ : 6′′, 2′′′ : 6′′′, 2′′′′-quinquepyridine), [Fe2(spy)2](ClO4)4 (2) (spy = 2, 2′ : 6′, 2′′ : 6′′, 2′′′ : 6′′′, 2′′′′: 6′′′′, 2′′′′′-sexipyridine), [Fe2(septipy)2](ClO4)4 (3) (septipy = 2, 2′ : 6′, 2′′ : 6′′, 2′′′ : 6′′′, 2′′′′ : 6′′′′, 2′′′′′ : 6′′′′′, 2′′′′′′-septipyridine) and SBA-15-supported iron terpyridine complex (4) are efficient catalysts for the practical oxidation of alkenes, arenes, alkanes, tertiary amines and N-acyl cyclic amines using Oxone as the oxidant. With 1, 2, 3 or 4 as the catalyst, a variety of electron-rich and electron-deficient alkenes were oxidized to the corresponding epoxides in high isolated yields (up to 99%). The reaction of arenes with Oxone afforded quinones in up to 91% isolated yields. Selective C–H bond oxidation of saturated alkanes to alcohols/ketones and demethylation of tertiary amines to secondary amines were achieved in good product yields. For the oxidation of N-acyl cyclic amines, the ring-opened products were obtained in up to 75% isolated yield with up to 96% substrate conversion. All of these iron complexes can efficiently catalyse the oxidative C–C bond cross-coupling reaction of tertiary amines with NaCN in up to 86% isolated yield using (tBuO)2 as the terminal oxidant. The oligopyridine ligands were oxidatively robust and could be re-used by the addition of iron(II) salt to generate the iron catalystsin situ. The active SBA-15-supported terpy ligand could be re-used for the oxidative catalysis for five consecutive runs without significant loss of catalytic activity.

Graphical abstract: Iron oligopyridine complexes as efficient catalysts for practical oxidation of arenes, alkanes, tertiary amines and N-acyl cyclic amines with Oxone

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Article information


Submitted
12 Apr 2011
Accepted
19 Jul 2011
First published
16 Aug 2011

Chem. Sci., 2011,2, 2187-2195
Article type
Edge Article

Iron oligopyridine complexes as efficient catalysts for practical oxidation of arenes, alkanes, tertiary amines and N-acyl cyclic amines with Oxone

P. Liu, Y. Liu, E. L. Wong, S. Xiang and C. Che, Chem. Sci., 2011, 2, 2187
DOI: 10.1039/C1SC00234A

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