In search of a simple synthetic access to analogs of naturally occurring glycolipids, glycosylamides have been synthesised in a two-step procedure from unprotected sugars, long-chain amines, and fatty acids. The N-glycosylation proceeded stereospecifically yielding crystalline beta-glycopyranosylamines. C-13 NMR spectroscopy of the glycosylamines in organic solvents revealed partial anomerisation, leading to alpha-glycosylamines and in part to corresponding N-furanosides. Selective N-acylation of either pure beta-glycosylamines or anomeric mixtures thereof with activated fatty acid led to formation of beta-glycosylamides exclusively. As evidenced by NMR spectroscopy, the glycosylamides exhibited rotameric isomerism. The glycosylamides were found to be strong stimulators of the specific immune response against antigens. (C) 1998 Elsevier Science Ltd. All rights reserved.
Influence of the Variation of the Alkyl Chain Length ofN-Alkyl-β-d-glycosylamine Derivatives on Antifungal Properties
摘要:
Twelve new glucosidic and galactosidic derivatives of N-alkylaminosugars with different alkylamines from 6 to 18 carbons were synthesized and characterized by H-1 and C-13 NMR. Their antifungal activity against the food fungal pathogen Aspergillus niger was evaluated using the radial growth assay. The influence of the variation of the alkyl chain length of N-alkylaminosugars on the mycelium growth was then discussed. Inhibition by the different alkylamines is shown as a biostatic effect rather than a biocidal effect. It was observed that alkylamines keep their antifungal properties after a thermal treatment compatible with food packaging and processing.
N-glycosylated carboxamide derivatives as growth-promoters in livestock
申请人:Bayer Aktiengesellschaft
公开号:US04680287A1
公开(公告)日:1987-07-14
Growth of animals is promoted by inclusion in their feed of compounds of the formula ##STR1## in which Z is a glycosyl radical bonded via the anomeric carbon atom, R.sub.1 is hydrogen or an optionally substituted hydrocarbon radical having up to 30 Carbon atoms optionally interrupted by O, N or S, and R.sub.2 is hydrogen or an alkyl or aralkyl radical having up to 30 Carbon atoms optionally interrupted by O or substituted by groups containing oxygen or by halogen, with the proviso that COR.sub.1 is not an acyl group having 1-5 Carbon atoms when R.sub.2 is an alkyl group having 10-20 Carbon atoms.
N-glycosylated carboxamide derivatives and their use for influencing the
申请人:Bayer Aktiengesellschaft
公开号:US04683222A1
公开(公告)日:1987-07-28
The invention relates to N-glycosylated carboxamide derivatives of Formula I which are useful for influencing the body's inherent defenses, e.g. for increasing immune system antibodies. Also included in the invention are compositions containing said N-glycosylated carboxamide derivative of Formula I as active ingredients and methods for the use of said compounds and compositions.
N-glycosylated carboxylic acid derivatives as agents for combating
申请人:Troponwerke GmbH & Co., KG
公开号:US04710491A1
公开(公告)日:1987-12-01
A method of combating rheumatic diseases which comprises administering to a patient afflicted therewith an amount effective to combat such disease of a compound of the formula ##STR1## in which Z is a glycosyl radical bonded via the anomeric carbon atom, R.sub.1 is hydrogen or an optionally substituted hydrocarbon radical with up to 30 C atoms, which hydrocarbon radical is optionally interrupted by O, N or S, and R.sub.2 is hydrogen or an alkyl or aralkyl radical with up to 30 C atoms, which is optionally interrupted by O, N or S or substituted by an oxygen-containing group or halogen, with the proviso that COR.sub.1 is not an acyl group with 1-5 C atoms if R.sub.2 is alkyl with 10-20 C atoms.
Substituted O-sulphonyl-glycosylamides, processes for their preparation
申请人:Bayer Aktiengesellschaft
公开号:US04699899A1
公开(公告)日:1987-10-13
Novel compounds of the formula ##STR1## in which X is hydrogen or --CH.sub.2 --OR.sup.5, Z represents OR.sup.4, NH.sub.2 or ##STR2## R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each independently is hydrogen or ##STR3## at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 being ##STR4## Y and W each independently is oxygen, sulphur, NH or CH.sub.2, and R.sup.1, R.sup.6, R.sup.7 and R.sup.8 each independently is an optionally substituted hydrocarbon radical with up to 50 C atoms, stimulate the immune system.
Substituted O-acylglycosylamides, pharmaceutical compositions and method
申请人:Bayer Aktiengesellschaft
公开号:US04574122A1
公开(公告)日:1986-03-04
Compounds of the formula ##STR1## in which X is hydrogen or the radical --CH.sub.2 OR.sup.5, three of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each independently is hydrogen or ##STR2## and the fourth is ##STR3## Z each independently is oxygen, sulphur, NH or CH.sub.2, and R.sup.1, R.sup.6 and R.sup.7 each independently is an optionally substituted hydrocarbon radical having up to 50 carbon atoms, stimulate the immune system's response and antibody production.