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Extended sulfonated bipyridine ligands targeting the para-selective borylation of arenes

Published version
Peer-reviewed

Type

Article

Change log

Authors

Douthwaite, JL 
Phipps, RJ 

Abstract

Iridium-catalysed borylation of arenes is one of the most widely used metal-catalyzed C-H activation processes to elaborate aromatic rings. Exercising catalyst control over regioselectivity of the C-H oxidative addition step remains an area of active research. In this paper we describe the synthesis of a selection of sulfonated bipyridine ligands in which there is an arene spacer between the sulfonate group and the bipyridine backbone. In comparison to our previous work which achieved metaselective borylation and in which the sulfonate bipyridine bore no spacer, we hoped that these extended ligands may allow a larger macrocyclic transition state for C-H activation thus favouring the para-position. The synthesised ligands have been evaluated on a series of arenes bearing amides and quaternary ammonium salts at varying distances from the aromatic ring.

Description

Keywords

C-H activation, Borylation, Non-covalent interactions, Para-selectivity

Journal Title

Tetrahedron

Conference Name

Journal ISSN

0040-4020
1464-5416

Volume Title

Publisher

Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/N005422/1)
The Royal Society (uf130004)
Engineering and Physical Sciences Research Council (1918558)
EPSRC (1800481)