Volume 9, Issue 22 p. 4225-4230
Full Paper

Diruthenium Diacetate Catalysed Aerobic Oxidation of Hydroxylamines and Improved Chemoselectivity by Immobilisation to Lysozyme

Flavia Lupi

Flavia Lupi

Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino (FI), Italy

LENS, University of Florence, Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy

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Dr. Tiziano Marzo

Dr. Tiziano Marzo

Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino (FI), Italy

Dipartimento di Chimica e Chimica Industriale (DCCI), Università di Pisa, Via Moruzzi, 13, 56124 Pisa, Italy

These Authors contributed equally to this work.

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Dr. Giampiero D'Adamio

Dr. Giampiero D'Adamio

Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino (FI), Italy

These Authors contributed equally to this work.

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Sara Cretella

Sara Cretella

Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino (FI), Italy

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Prof. Francesca Cardona

Corresponding Author

Prof. Francesca Cardona

Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino (FI), Italy

Associated with CNR-INO, Via Nello Carrara 1, Sesto Fiorentino (FI), Italy

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Prof. Luigi Messori

Corresponding Author

Prof. Luigi Messori

Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino (FI), Italy

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Prof. Andrea Goti

Corresponding Author

Prof. Andrea Goti

Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino (FI), Italy

Associated with CNR-INO, Via Nello Carrara 1, Sesto Fiorentino (FI), Italy

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First published: 09 July 2017
Citations: 12

Graphical Abstract

Lysozyme support: The novel aerobic oxidation of hydroxylamines to nitrones catalyzed by Ru2(OAc)4Cl or its adduct with lysozyme [HEWL/Ru2(OAc)2] is reported. The coordination of the diruthenium moiety to the protein imparts complete chemoselectivity to the reaction, in contrast to the metallic complex alone.

Abstract

A new green method for the preparation of nitrones through the aerobic oxidation of the corresponding N,N-disubstituted hydroxylamines has been developed upon exploring the catalytic activity of a diruthenium catalyst, that is, [Ru2(OAc)4Cl]), in aqueous or alcoholic solution under mild reaction conditions (0.1 to 1 mol % catalyst, air, 50 °C) and reasonable reaction times. Notably, the catalytic activity of the dimetallic centre is retained after its binding to the small protein lysozyme. Interestingly, this new artificial metalloenzyme conferred complete chemoselectivity to the oxidation of cyclic hydroxylamines, in contrast to the diruthenium catalyst.