CC BY 4.0 · Synthesis 2022; 54(01): 133-146
DOI: 10.1055/a-1579-2190
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Nickel Boride Catalyzed Reductions of Nitro Compounds and Azides: Nanocellulose-Supported Catalysts in Tandem Reactions

Giampiero Proietti
a   Division of Organic Chemistry, Department of Chemistry, School of Engineering Sciences in Chemistry, Biology and Health, KTH – Royal Institute of Technology, Teknikringen 30, 10044 Stockholm, Sweden
,
Kaniraj Jeya Prathap
a   Division of Organic Chemistry, Department of Chemistry, School of Engineering Sciences in Chemistry, Biology and Health, KTH – Royal Institute of Technology, Teknikringen 30, 10044 Stockholm, Sweden
,
Xinchen Ye
b   Department Fiber and Polymer Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH – Royal Institute of Technology, 10044 Stockholm, Sweden
,
Richard T. Olsson
b   Department Fiber and Polymer Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH – Royal Institute of Technology, 10044 Stockholm, Sweden
,
Peter Dinér
a   Division of Organic Chemistry, Department of Chemistry, School of Engineering Sciences in Chemistry, Biology and Health, KTH – Royal Institute of Technology, Teknikringen 30, 10044 Stockholm, Sweden
› Author Affiliations
K.J.P., G.P. and P.D. thank the Wenner-Gren Stiftelserna (Grant No. UPD2016-0084) and KTH Royal institute of Technology for financial support.


Abstract

Nickel boride catalyst prepared in situ from NiCl2 and sodium borohydride allowed, in the presence of an aqueous solution of TEMPO-oxidized nanocellulose (0.01 wt%), the reduction of a wide range of nitroarenes and aliphatic nitro compounds. Here we describe how the modified nanocellulose has a stabilizing effect on the catalyst that enables low loading of the nickel salt pre-catalyst. Ni-B prepared in situ from a methanolic solution was also used to develop a greener and facile reduction of organic azides, offering a substantially lowered catalyst loading with respect to reported methods in the literature. Both aromatic and aliphatic azides were reduced, and the protocol is compatible with a one-pot Boc-protection of the obtained amine yielding the corresponding carbamates. Finally, bacterial crystalline nanocellulose was chosen as a support for the Ni-B catalyst to allow an easy recovery step of the catalyst and its recyclability for new reduction cycles.

Supporting Information



Publication History

Received: 08 June 2021

Accepted after revision: 05 August 2021

Accepted Manuscript online:
05 August 2021

Article published online:
20 October 2021

© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by/4.0/)

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