title: Synthesis of new glycosyl biuret and urea derivatives as potential glycoenzyme inhibitors.
abstract: O-peracetylated 1-(beta-D-glucopyranosyl)-5-phenylbiuret was prepared in the reaction of O-peracetylated beta-D-glucopyranosylisocyanate and phenylurea. The reaction of O-peracetylated N-beta-D-glucopyranosylurea with phenylisocyanate furnished the corresponding 1-(beta-D-glucopyranosyl)-3,5-diphenyl- as well as 3-(beta-D-glucopyranosyl)-1,5-diphenyl biurets besides 1-(beta-D-glucopyranosyl)-3-phenylurea. O-Peracetylated 1-(beta-D-glucopyranosyl)-5-(beta-D-glycopyranosyl)biurets were obtained in one-pot reactions of O-peracetylated beta-D-glucopyranosylamine with OCNCOCl followed by a second glycopyranosylamine of beta-D-gluco, beta-D-galacto and beta-D-xylo configurations. O-Acyl protected 1-(beta-D-glucopyranosyl)-3-(beta-D-glycopyranosylcarbonyl)ureas were obtained from the reaction of beta-D-glucopyranosylisocyanate with C-(glycopyranosyl)formamides of beta-D-gluco and beta-D-galacto configurations. The O-acyl protecting groups were removed under acid- or base-catalyzed transesterification conditions, except for the N-acylurea derivatives where the cleavage of the N-acyl groups was faster than deprotection. Some of the new compounds exhibited moderate inhibition against rabbit muscle glycogen phosphorylase b and human salivary alpha-amylase.
authors.affiliation: Department of Organic Chemistry, University of Debrecen, POB 20, H-4010 Debrecen, Hungary.
authors.forename: Nóra
authors.initials: N
authors.lastname: Felföldi
authors.forename: Marietta
authors.initials: M
authors.lastname: Tóth
authors.forename: Evangelia D
authors.initials: ED
authors.lastname: Chrysina
authors.forename: Maria-Despoina
authors.initials: MD
authors.lastname: Charavgi
authors.forename: Kyra-Melinda
authors.initials: KM
authors.lastname: Alexacou
authors.forename: László
authors.initials: L
authors.lastname: Somsák
mesh_terms: D000818:Animals; D001737:Biuret / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D050260:Carbohydrate Metabolism; D004791:Enzyme Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D024981:Glycogen Phosphorylase / Q000037:antagonists & inhibitors / Q000378:metabolism; D006031:Glycosylation; D006801:Humans; D007202:Indicators and Reagents / Q000737:chemistry; D020128:Inhibitory Concentration 50; D011817:Rabbits; D000516:alpha-Amylases / Q000037:antagonists & inhibitors / Q000378:metabolism
chemical_list: D004791:Enzyme Inhibitors; D007202:Indicators and Reagents; D001737:Biuret; D024981:Glycogen Phosphorylase; D000516:alpha-Amylases