A new, one-pot, two-stage procedure for the preparation of the alpha- and beta-D-glucopyranosyl ureas has been developed. Oxidation of glucopyranosyl isocyanides provides glucopyranosyl isocyanates, which can be trapped in situ with amines to afford good yields of glucopyranosyl ureas. Application of this method establishes the successful synthesis of the hitherto unknown N,N'-di-alpha,alpha- and alpha
作者:Constantinos G. Neochoritis、Ehsan Ghonchepour、Maryam Kazemi Miraki、Tryfon Zarganes-Tzitzikas、Katarzyna Kurpiewska、Justyna Kalinowska-Tłuścik、Alexander Dömling
DOI:10.1002/ejoc.201801588
日期:2019.1.10
Crystal structures of sugar formamides and isocyanides of mono‐, di‐ and trisaccharides were analyzed, revealing useful structural information. Trends were obtained which were utilized in the design and synthesis of glycosyl adducts bearing macrocycle, lactone and indole derivatives
A study of methods for the synthesis of urea and carbamate glycosides, starting with unprotective carbohydrates, led to the preparation of amino acid-carbohydrate conjugates in aqueous media.
N-glycosyl carbamates has been developed through reaction of D-glucose with n-butyl carbamate in acidic aqueous media. The structures of the N-glucosyl carbamates were unambiguously determined by comparison with authentic samples, prepared using the isocyanide method. With this protective group-free method for synthesis of N-glycosyl carbamates in hand, an anomeric pair of N-xylopyranosyl carbamates were