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Radical C-N Borylation of Aromatic Amines Enabled by a Pyrylium Reagent.


ABSTRACT: Herein, we report a radical borylation of aromatic amines through a homolytic C(sp2 )-N bond cleavage. This method capitalizes on a simple and mild activation via a pyrylium reagent (Sc Pyry-OTf) thus priming the amino group for reactivity. The combination of terpyridine and a diboron reagent triggers a radical reaction which cleaves the C(sp2 )-N bond and forges a new C(sp2 )-B bond. The unique non-planar structure of the pyridinium intermediate, provides the necessary driving force for the aryl radical formation. The method permits borylation of a wide variety of aromatic amines indistinctively of the electronic environment.

SUBMITTER: Ma Y 

PROVIDER: S-EPMC7155052 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Radical C-N Borylation of Aromatic Amines Enabled by a Pyrylium Reagent.

Ma Yuanhong Y   Pang Yue Y   Chabbra Sonia S   Reijerse Edward J EJ   Schnegg Alexander A   Niski Jan J   Leutzsch Markus M   Cornella Josep J  

Chemistry (Weinheim an der Bergstrasse, Germany) 20200309 17


Herein, we report a radical borylation of aromatic amines through a homolytic C(sp<sup>2</sup> )-N bond cleavage. This method capitalizes on a simple and mild activation via a pyrylium reagent (<sup>Sc</sup> Pyry-OTf) thus priming the amino group for reactivity. The combination of terpyridine and a diboron reagent triggers a radical reaction which cleaves the C(sp<sup>2</sup> )-N bond and forges a new C(sp<sup>2</sup> )-B bond. The unique non-planar structure of the pyridinium intermediate, prov  ...[more]

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