Selective demethylation of <i>O</i>-aryl glycosides by iridium-catalyzed hydrosilylation
作者:Caleb A. H. Jones、Nathan D. Schley
DOI:10.1039/d1cc00496d
日期:——
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
approach in two steps and one pot using the rhamnopyranosyl chloride as key intermediate. The two-step one-pot procedure is more convenient and environmentally friendly, compared to the published synthetic routes. Besides, the structure-reactivity relationship and the plausible mechanism for this base-catalyzed glycosylation were discussed by means of the Hammettequation.