Issue 48, 2021

Selective demethylation of O-aryl glycosides by iridium-catalyzed hydrosilylation

Abstract

The cleavage of alkyl ethers by hydrosilylation is a powerful synthetic tool for the generation of silyl ethers. Previous attempts to apply this transformation to carbohydrate derivatives have been constrained by poor selectivity and preferential reduction of the anomeric position. O-Aryl glycosides are found to be stable under iridium- and borane-catalyzed hydrosilylation conditions, allowing for alkyl ether cleavage without loss of anomeric functionality. A cationic bis(phosphine)iridium complex catalyzes the selective 3-demethylation of a variety of 2,3,4-tri-O-methyl pyranoses, offering a unique approach to 3-hydroxy or 3-acetyl 2,4-di-O-methylpyranoses.

Graphical abstract: Selective demethylation of O-aryl glycosides by iridium-catalyzed hydrosilylation

Supplementary files

Article information

Article type
Communication
Submitted
28 Jan 2021
Accepted
18 May 2021
First published
18 May 2021

Chem. Commun., 2021,57, 5953-5956

Selective demethylation of O-aryl glycosides by iridium-catalyzed hydrosilylation

C. A. H. Jones and N. D. Schley, Chem. Commun., 2021, 57, 5953 DOI: 10.1039/D1CC00496D

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