title: The inhibitory activities of 2-acetamido-2,3-dideoxy-D-hex-2-enonolactones on 2-acetamido-2-deoxy-beta-D-glucosidase.
abstract: Treatment of 2-acetamido-2-deoxy-D-mannono-1,4-lactone with dicyclohexylamine in ethanolic solution afforded an unsaturated 1,4-lactone, 2-acetamido-2,3-dideoxy-D-erythro-hex-2-enono-1,4-lactone (1), in good yield. 2-Acetamido-2,3-dideoxy-D-threo-hex-2-enono-1,4-lactone (2) was similarly prepared from 2-acetamido-2-deoxy-D-galactono-1,4-lactone. An unsaturated 1,5-lactone, 2-acetamido-2,3-dideoxy-D-threo-hex-2-enono-1,5-lactone (4), was obtained through the oxidation of 2-acetamido-2-doexy-4,6-0-isopropylidene-D-galactopyranose with silver carbonate on Celite, followed by mild hydrolysis. The inhibitory activity of four isomeric 2-acetamido-2,3-dideoxy-D-hex-2-enonolactones [1, 2, 4, and 2-acetamido-2,3-dideoxy-D-erythro-hex-2-enono-1,5-lactone (3)] was assayed against 2-acetamido-2-deoxy-beta-D-glucosidase from bull epididymis. Only the erythro lactones 1 and 3 are weak competitive inhibitors, whereas the threo lactones 2 and 4 are practically inactive. The 1,4-lactone 1 inhibited 2-acetamido-2-deoxy-beta-D-glucosidase more strongly than the 1,5-lactone 3. The lactones 1-4 were found to be quite stable in aqueous solution or under inhibitory-assay conditions. In addition, two 2-acetamido-2-deoxy-D-glycals, 2-acetamido-1,5-anhydrohex-1-enitol (7) were tested; both are 10 times as active as 1.
mesh_terms: D000118:Acetylglucosaminidase / Q000037:antagonists & inhibitors*; D000818:Animals; D002417:Cattle; D004822:Epididymis / Q000201:enzymology; D006596:Hexosaminidases / Q000037:antagonists & inhibitors*; D007783:Lactones / Q000138:chemical synthesis / Q000494:pharmacology*; D008297:Male; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D007783:Lactones; D006596:Hexosaminidases; D000118:Acetylglucosaminidase