Methods for 2-Deoxyglycoside Synthesis

Deoxy-sugars often play a critical role in modulating the potency of many bioactive natural products. Accordingly, there has been sustained interest in methods for their synthesis over the past several decades. The focus of much of this work has been on developing new glycosylation reactions that permit the mild and selective construction of deoxyglycosides. This Review covers classical approaches to deoxyglycoside synthesis, as well as more recently developed chemistry that aims to control the selectivity of the reaction through rational design of the promoter. Where relevant, the application of this chemistry to natural product synthesis will also be described.

Novel glycosylation methods and their application to natural products synthesis

In this short review article, several glycosylation methods that were developed in our laboratories, including stereocontrolled glycosylation using 2,6-anhydro-2,6-dideoxy-2,6-dithio sugars for obtaining 2,6-dideoxy glycosides, C-glycosylation employing unprotected sugars, environmentally benign glycosylation utilizing heterogeneous solid acids and ionic liquids, are recounted. In addition, representative and significant applications of these methods to the synthesis of complex natural products are described.

Environmentally benign beta-stereoselective glycosidations of glycosyl phosphites using a reusable heterogeneous solid acid, montmorillonite K-10

Environmentally benign and stereoselective beta-glycosidations of glycopyranosyl phosphites and alcohols using a reusable heterogeneous solid acid, montmorillonite K-10, as an activator have been developed. By these glycosidations, beta-gluco-, 2-deoxy-beta-gluco-, and beta-mannopyranosides were selectively produced in good to high yields.

Environmentally benign and stereoselective formation of beta-mannosidic linkages utilizing 2,3-di-O-benzyl-4,6-O-benzylidene-protected mannopyranosyl phosphite and montmorillonite K-10

An environmentally benign and stereoselective beta-mannopyranosylation has been developed employing 4,6-O-benzylidene-protected mannopyranosyl diethyl phosphite as a glycosyl donor and montmorillonite K-10 as an activator.