One-Pot Stereospecific Synthesis of 1,4-Oligosaccharides by Glycal-Derived Vinyl Epoxides Assembly.

Recently, naturally occurring linear 1,4-glycans have attracted remarkable attention for their activity in cancer and neurodegenerative disease treatment. Classical chemical synthetic strategies for linear 1,4-oligosaccharides are considerably time-consuming due to orthogonal protection/deprotection, the introduction of leaving groups, and various forms of activation of the glycosylation reaction. Herein, we present a new one-pot microwave-activated reiterative assembly of glycal-derived vinyl epoxides in an uncatalyzed substrate-dependent stereospecific process for the preparation of both β-1,4-d-Gulo and α-1,4-d-Manno oligosaccharides.