摘要:
The present invention is directed to novel 38-decarboxy-38-hydroxymethyl derivatives of teicoplanin antiobiotics and a process for preparing them which includes submitted the corresponding lower alkyl ester precursor to a reduction reaction in the presence of an alkali metal borohydride. The compounds of the invention show an improved antibacterial activity against some clinical isolates of Staphylococci somewhat resistant to teicoplanin.The teicoplanin derivatives of the present invention are represented by the following formula: ##STR1## wherein: X represents hydroxymethyl;R represents hydrogen or --N�(C.sub.9 -C.sub.12)aliphatic acyl!-.beta.-D-2-deoxy-2-aminoglucopyranosyl;R.sub.1 represents hydrogen or N-acetyl-.beta.-D-2-deoxy-2-aminoglucopyranosyl;R.sub.2 represents hydrogen of alpha-D-mannopyranosyl;R.sub.3 represents hydrogen or a protecting group of the amino function; and the acid addition salts thereof; with the proviso that R.sub.1 represents hydrogen only when R and R.sub.2 are simultaneously hydrogen.
摘要:
Synthetic aglucodalbaheptides of formula (I) wherein W and Z, each independently, represent the relative portions of the aglycon of an antibiotic of the dalbaheptide group. Y represents a carboxylic group or a functional derivative of said carboxylic group; R and R.sub.1, each independently, represent hydrogen or a protecting group of the amino function. R.sub.2 represents hydrogen; and their salts with acid and bases as well as their inner salts. A process for producing the aglucodabaheptides of formula (I) and their use as medicaments.
摘要:
The present invention is directed to new C.sup.63 amide derivatives of teicoplanin wherein the amide moiety is derived from a di- or poly-alkylamine, and to a process for preparing them. The derivatives are prepared by reacting a teicoplanin-like product with an active ester forming reagent such as chloroacetonitrile and then contacting said active ester with the appropriate di- or poly-alkylamine. The amide derivatives of the invention are active against gram positive and gram negative bacteria.
摘要:
C.sup.63 -Amide derivatives of 34-de(acetylglucosaminyl)-34-deoxy-teicoplanin wherein the amide moiety is derived from a di- or poly-amine. The derivatives are prepared by reacting 34-de(acetylglucosaminyl)- 34-deoxy-teicoplanins with an active esters forming reagent such as chloroacetonitrile and then contacting the resulting active esters with the appropriate di- or poly-amine. The amide derivatives which are active against Gram-positive microorganisms, in particular against Group A Streptococci were found to be active also against bacteria which are resistant to glycopeptide antibiotics.
摘要:
The present invention is directed to new de-(acetylglucosaminyl)-di(dehydro)deoxy teicoplanin derivatives which possess antibiotic activity mainly against gram positive bacteria.The new compounds are obtained by chemical modification of a teicoplanin antibiotic substance.
摘要:
The present invention is directed to the essentially pure preparation of an antibiotic substance arbitrarily designated antibiotic L 17054. This antibiotic substance is obtained from the known antibiotic substance named teicoplanin (formerly teichomycin) by chemical treatment. The new compound and the pharmaceutically acceptable salts possess antimicrobial activity.
摘要:
The present invention is directed to ester derivatives at the carboxylic function of the glycopeptidic antibiotic substance called antibiotic L 17046 with antimicrobial activity mainly against gram-positive bacteria.
摘要:
This invention relates to a process for converting a teicoplanin-like compound into antibiotic L 17046 characterized in that a teicoplanin-like compound selected from teicoplanin complex, any further purified preparation thereof, teicoplanin factor A.sub.2, teicoplanin factor A.sub.3, each of the main components of teicoplanin factor A.sub.2, antibiotic L 17054 and a mixture of two or more of the above substances in any proportion is submitted to hydrolysis with a strong acid in the presence of a polar aprotic organic solvent selected from ethers, ketones and mixtures thereof that a room temperature are liquid.
摘要:
The present invention is directed to a chemical process for preparing the antibiotic substance denominated antibiotic L 17054 and its pharmaceutically acceptable salts by selectively hydrolyzing teicoplanin or a factor or component thereof with a concentrated strong organic acid.
摘要:
The present invention is directed to novel antibiotic A 40926 derivatives characterized by having a carboxy, (C.sub.1 -C.sub.4) alkoxy-carbonyl, aminocarbonyl, (C.sub.1 -C.sub.4) alkylaminocarbonyl, di (C.sub.4 -C.sub.4)alkylaminocarbonyl or hydroxymethyl substituent on the N-acylaminoglucuronyl moiety and a hydroxy or a polyamine substituent in position 63 of the molecule. The compounds of the invention show high in vitro activity against glycopeptide resistant Enterococci and Staphylococci.