title: Efficient sialyltransferase inhibitors based on glycosides of N-acetylglucosamine.
abstract: D-Glucosamine was transformed into phenyl and 2-benzoyloxyethyl N-acetylglucosamine beta-glycosides 6a and 6b, respectively. Transformation of 6a,b into 6-O-unprotected N-acetylglucosamine derivatives 9a,b permitted the generation of an aldehyde group in the 6-position. Treatment of these intermediates with base afforded unsaturated aldehyde derivatives 10a,b, which are structural mimics of 2,3-dehydroneuraminic acid. H-Phosphonate addition to the aldehyde group and attachment of the cytidine monophosphate residue to the generated hydroxy group gave fully protected transition state analogues of cytidine monophosphate-N-acetylneuraminic acid 14a,b. Liberation of the unprotected compounds 1ah,l and 1bh,l led to excellent inhibitors of alpha(2-6)-sialyltransferase from rat liver. Variation of the protective group cleavage procedure for 14a,b led to formal loss of phosphate, thus resulting in diene derivatives (E)-/(Z)-2a,b, which also exhibited inhibitory properties.
authors.affiliation: Fachbereich Chemie, Universität Konstanz, Fach M 725, D-78457 Konstanz, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Schwörer
authors.forename: Richard R
authors.initials: RR
authors.lastname: Schmidt
mesh_terms: D000117:Acetylglucosamine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D004791:Enzyme Inhibitors / Q000138:chemical synthesis* / Q000494:pharmacology*; D006027:Glycosides / Q000138:chemical synthesis* / Q000494:pharmacology*; D012799:Sialyltransferases / Q000037:antagonists & inhibitors*
chemical_list: D004791:Enzyme Inhibitors; D006027:Glycosides; D012799:Sialyltransferases; D000117:Acetylglucosamine