Synthesis 2020; 52(13): 1897-1902
DOI: 10.1055/s-0039-1690893
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© Georg Thieme Verlag Stuttgart · New York

Reductive Amination of Aryl Boronic Acids: Parallelism of the Catalytic Reactivity of Transition Metals and Main Group Elements in the C(sp2)–N Bond-Forming Reactions

Oleg A. Levitskiy
,
Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russia   Email: tvm@org.chem.msu.ru
› Author Affiliations
This work was supported by the Russian Science Foundation (Project number 19-13-00094).
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Publication History

Received: 27 February 2020

Accepted after revision: 24 March 2020

Publication Date:
20 April 2020 (online)


Abstract

The results of the DFT studies on the mechanism of the PIII/PV=O catalyzed reductive amination of nitrosoarenes using ArB(OH)2 yielding diaryl amines are reported. This allowed a comparison of the reaction paths and key intermediates of the Cu(I)- and P(III)-mediated reductive aminations of aryl boronic acids using alkylnitrites, nitroso- or nitroarenes, and revealed important similarities in the catalytic reactivity of transition-metal and main-group elements in C(sp2)–N bond-forming reactions. It is shown that both transformations occur via ambiphilic nitrenoid-type key intermediates, the reactivity of which towards the aryl boronic acid is attributed to the presence of both a Lewis acid center (Cu or P) and a Lewis base center (the N or O atoms of the ‘N=O’ component).

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