N-(beta-Glycopyranosyl)azidoacetamides, mimetics of the widely distributed GlcNAc-Asn linkage in glycoproteins, have been synthesized in good yields starting from beta-glycopyranosylamines in four steps involving selective N-chloroacetylation, peracetylation catalyzed by Na beta-zeolite, displacement of the Cl group by NaN3 in aqueous acetone, and Zemplen de-O-acetylation.
Crystal Structures of β‐1‐N‐Chloroacetamido Derivatives of d‐Glucose and d‐Galactose
摘要:
Crystal structures of 1-N-(beta-D-glucopyranosyl)chloroacetamide (1), an inhibitor of glycogen phosphorylase, and the corresponding galactopyranosyl amide (2) have been determined. Both crystals belong to P2(1)2(1)2(1) space group with 1 having the unit cell dimensions of a=7.939(3), b=9.547(3) and c=14.157(2) Angstrom, while those of 2 are, a=7.636(10), b=9.004(8) and c=14.807(5) Angstrom. The sugar ring takes a C-4(1) conformation and the amide linkage exists in Z-anti conformation in both crystals. The torsion angle O5-C1-N1-C1' is -93.9(5) for 1 and -111.5(3)degrees for 2. The conformational preference of C1 and N1 in 1 and 2 is found to be between anti and gauche. The molecular assembly in both 1 and 2 is stabilized by a finite chain of hydrogen bonds starting from N1H and ending at O1', whereas a ten membered hydrogen-bonded ring involving O4H and O5 is observed in 1.
Glycoconjugates of amines: alkylation of primary and secondary amines withN-chloroacetyl-β-glycopyranosylamines
作者:L. M. Likhosherstov、O. S. Novikova、V. N. Shibaev
DOI:10.1007/bf02503499
日期:1998.6
Efficient monoalkylation of a series of primary and secondary amines was demonstrated with the use ofN-chloroacetylglycosylamines derived fromd-glucose,d-galactose,d-mannose,N-acetyl-d-glucosamine, and lactose. The reaction was shown to be useful for incorporation of carbohydrate residues into physiologically active compounds. Glycoconjugates of some derivatives of piperazine, 2-phenylethylamine, tryptamine
Synthesis ofN-chioroacetyl-?-glycopyranosylamines, derivatives of monosaccharides and lactose
作者:L. M. Likhosherstov、O. S. Novikova、V. N. Shibaev、N. K. Kochetkov
DOI:10.1007/bf01431821
日期:1996.7
N-Chloroacetyl-beta-glycosylamines were synthesized from various monosaccharides (hexoses, pentoses, deoxysugars, uronic acids, and sugar phosphates) and a disaccharide (lactose) by N-acylation of the corresponding beta-glycosylamines with chloroacetic anhydride in DMF. In some cases, treatment of monosaccharides with NH3 in the presence of (NH4)CO3 in MeOH or aqueous MeOH was more efficient than the methods previously described, as it gave beta-glycosylamines in higher yields.
[EN] TREATMENT OF DIABETES<br/>[FR] TRAITEMENT DU DIABETE
申请人:UNIV NEWCASTLE
公开号:WO2006043036A2
公开(公告)日:2006-04-27
[EN] The invention provides a composition comprising therapeutically effective amounts of a first agent adapted to promote glucokinase activation and a second agent adapted to inhibit or inactivate glycogen phosphorylase, and optionally a pharmaceutically acceptable vehicle. The composition may be used for the treatment of diabetes. The invention further provides methods of treating patients suffering from diabetes, and also a delivery system for use in a gene therapy of diabetes sufferers. [FR] L'invention concerne une composition comprenant des quantités efficaces thérapeutiquement d'un premier agent permettant de promouvoir une activation de la glucokinase et un second agent conçu pour inhiber ou inactiver la phosphorylase du glycogène, et éventuellement un véhicule pharamceutiquement acceptable. La composition peut être utilisée pour le traitement du diabète. L'invention concerne en particulier des procédés pour traiter des patients souffrant du diabète, et également un système d'administration destiné à être utilisé dans une thérapie génique conçue pour les personnes souffrant de diabète.