A novel approach to the synthesis of urea glycosides in aqueous media has been developed. Reaction of Steyermark’s glucosyl carbamate 1 with amines was carried out in water to afford urea glucosides in good yields. This method was successfully applied to develop a new route to the synthesis of urea-tethered neoglycoconjugates and pseudooligosaccharides.
1,2-cis-Fused bicyclic sugar thiocarbamates of gluco, and manno configurations have been prepared by treatment of the corresponding O-unprotected amino Sugars and glycopyranosyl amines with thiophosgene. The reactivity of these Compounds towards amines has been studied in order to determine whether these Compounds could act as latent isothiocyanates; it is shown that 1,2-cis-fused bicyclic Sugar thiocarbamates are more stable than their trans analogues, and are]lot transformed into thioureas upon treatment with amines. An unprecedented isomerization of a peracetylated glucopyranoso[2,1-d] oxazolidine-2-thione into a glucopyranoso[2,1-d]thiazolidin-2-one in DMF is also reported. The structure of this thiazolidin-2-one was confirmed by X-ray crystallography. (C) 2008 Elsevier Ltd. All rights reserved.
KOVACS, JOZSEF;PINTER, ISTVAN;LENDERING, URSULA;KOLL, PETER, CARBOHYDR. RES., 210,(1991) C. 155-166
作者:KOVACS, JOZSEF、PINTER, ISTVAN、LENDERING, URSULA、KOLL, PETER