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Simple and mild stereoselective O-glycosidation using 1,2-anhydrosugars under neutral conditions
Authors:Devaraj Somasundaram  Kalpattu K. Balasubramanain  Bhagavathy Shanmugasundaram
Affiliation:1. Department of Chemistry, B.S. Abdur Rahman Crescent Institute of Science and Technology, Vandalur, Chennai 600015, India;2. Department of Biotechnology, Indian Institute of Technology Madras, Guindy, Chennai 600048, India
Abstract:The ring opening of α-d-1,2-anhydrohexapyranoses with phenols proceeded smoothly in ethyl acetate (neutral conditions) in the absence of metal ion catalysts or additives to stereoselectively furnish 1,2-cis-α-aryl glycosides as the major product and 1,2-trans-β-aryl glycosides as the minor product in good yields. Under similar conditions, this ring opening reaction with alcohols afforded exclusively β-alkyl glycosides in excellent yields.
Keywords:1,2-Anhydrosugars  Glycal epoxide  Aromatic glycosylation  Aryl glycosides  Alkyl glycosides
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