摘要:
A clinically valuable antibiotic, 3',4'-dideoxykanamycin B is now produced by a reduced number of consecutive steps in an improved overall yield by new processes starting from kanamycin B via intermediate derivatives of kanamycin B in which all the five amino groups are protected with an unsubstituted or substituted benzyloxycarbonyl group and possibly the 2"-hydroxyl group may be protected with a lower alkylsufonyl, arylsulfonyl or aralkylsulfonyl group.
摘要:
A useful antibiotic, 3',4'-dideoxykanamycin B can be prepared in shortened steps and in an improved overall yield by a new process starting from kanamycin B via new intermediate derivatives of kanamycin B in which all the amino groups and possibly the 2"-hydroxyl group are protected with sulfonyl-type protecting groups selected from lower alkyl-, aryl- and aralkyl-sulfonyl groups.
摘要:
New compound, 3',4'-dideoxy-3'-fluorokanamycin B is now provided, which is useful as antibacterial agent.3',4'-Dideoxy-3'-fluorokanamycin B is prepared by a process comprising halogenating an N,O-protected derivative of 3'-deoxy-3'-fluoro-4'-O-sulfonylkanamycin B with a metal halide, reducing the resulting 4'- halogenated 3'-deoxy-3'-fluorokanamycin B derivative to convert its 4'-halo group into a hydrogen atom, and thereby to produce an N,O-protected derivative of 3',4'-dideoxy-3'-fluorokanamycin B, and removing the remaining amino-protecting groups and the remaining hydroxyl-protecting groups from the reduction product by conventional deprotecting methods.
摘要:
3'-Deoxykanamycin A useful as antibacterial agent is produced from a protected kanamycin A derivative either by a process comprising imidazolylthiocarbonylation of the 3'- and 2"-hydroxyl groups of 4",6"-O-cyclohexylidene-4'-0:6'-N-carbonyl-5,2'-O-isopropylidene-1,3,3"-tri-N-tosylkanamycin A, preferential removal of the 3'-imidazolylthiocarbonyloxy group with tributyltin hydride for the 3'-deoxygenation, followed by removal of the 2"-O-imidazolylthiocarbonyl group with aqueous ammonia, removal of the N-tosyl groups with alkali or alkaline earth metal in liquid ammonia, hydrolytic fission of the 4',6'-cyclic carbamate ring and concurrent removal of the 5,2'-O-isopropylidene group and 4",6"-O-cyclohexylidene group, or by a process comprising selective acetylation of the 2"-hydroxyl group of said protected kanamycin A derivative with acetyl chloride in pyridine, trifluoromethanesulfonylation of the 3'-hydroxyl group, followed by concurrent removal of the 3'-trifluoromethanesulfonyloxy group and N-tosyl groups with alkali metal in liquid ammonia, removal of the 2"-O-acetyl group concurrently with hydrolytic fission of 4',6'-cyclic carbamate, and hydrolytic removal of the 5,2'-O-isopropylidene and 4",6"-O-cyclohexylidene groups.
摘要:
Aminoglycosidic antibiotic comprising a 6-0-(3"-aminoglycosyl)-2-deoxystreptamine optionally having a 4-0-(aminogycosyl) group, such as kanamycins, gentamicins, sisomicin, forms reversible complex with zinc cations by association of the zinc cations with some pairs of aminohydroxyl groups in the aminoglycoside, and the zinc-complexed amino groups are blocked from acylation. Reaction of this zinc complex with an acylation reagent having an amino-blocking acyl group brings about acylation of the non-complexed amino groups to give an N-acylated zinc complex, namely a complex of zinc cation with an N-acylated aminoglycosidic antibiotic derivative. Removal of zinc cations from N-acylated zinc complex yields a partially N-acylated aminoglycosidic antibiotic where 1- and 3"-amino groups are unprotected but all other amino groups protected with acyl group. Further reaction of this partially N-acylated product with a certain alkanoic acid or N-formyl-imidazole results in preferential acylation of 3"-amino group without 1-amino group being acylated, affording a 1-N-unprotected and other N-fully-protected derivative of the aminoglycosidic antibiotic which is valuable to be 1-N-acylated with .alpha.-hydroxy-.omega.-aminoalkanoic acid for high-yield production of known semi-synthetic 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-aminoglycosidic antibiotic.
摘要:
An aminoglycoside compound of the following formula ##STR1## wherein one of R.sub.1 and R.sub.2 represents a hydrogen atom and the other, a methyl group, R.sub.3 represents a hydrogen atom or an amino acyl group having 2 to 5 carbon atoms, R.sub.4 represents a lower alkyl group substituted by one or two substituents selected from the class consisting of hydroxy and amino groups, or a hexopyranosyl group whose hydroxy groups may be substituted by amino groups,and a pharmaceutically acceptable acid addition salt thereof; and an antibiotic composition comprising said compound and its pharmaceutically acceptable acid addition salt.
摘要:
3'-Deoxykanamycin B, namely tobramycin is produced in an improved yield with a reduced reaction time under moderate reaction conditions, starting from a penta-N-protected 3'-mono-O-alkyl-, aralkyl- or arylsulfonylated derivative of kanamycin B in which all the 1, 3, 2' and 3"-amino groups and possibly the 6'-amino group have been protected by an arylsulfonyl group, especially tosyl group; the 3'-hydroxyl group of kanamycin B has been alkyl-, aralkyl- or arylsulfonylated; the 4"- and 6"-hydroxyl groups have been blocked with a di-valent hydroxyl-protecting group; and possibly the 4'-hydroxyl group and 6'-amino group have been blocked by being converted into the form of a 4', 6'-cyclic carbamate formed between the 4'-hydroxyl group and the 6'-amino group, by subjecting to a process essentially comprising reaction of said protected kanamycin B derivative with a metal halide for a reaction time of 30 min. to 2 hours at a reaction temperature of 0.degree. C..about.150.degree. C. to produce the corresponding 3'-halo compound, reductive replacement of the 3'-halo group by hydrogen and deprotection.
摘要:
A 1-N-(.alpha.-substituted-.omega.-aminoacyl)-3'-deoxyribostamycin, which is a useful antibiotic active against various drug-resistant bacteria, can be prepared advantageously by a process starting from a protected derivative of ribostamycin in the form of 1,6-carbamate and comprising the 3'-deoxygenation, the splitting of the carbamate linkage and the 1-acylation.
摘要:
1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-derivatives of 3'-deoxykanamycin A or 6'-N-methyl-3'-deoxykanamycin A are provided as new and useful compounds which are active against gram-negative and gram-positive bacteria, including drug-resistant strains of these bacteria. Examples of these compounds include 1-N-((SR)-.beta.-amino-.alpha.-hydroxypropionyl)-3'-deoxykanamycin A, 1-N-((S)-.gamma.-amino-.alpha.-hydroxybutyryl)-3'-deoxykanamycin A, 1-N-((S)-.delta.-amino-.alpha.-hydroxyvaleryl)-3'-deoxykanamycin A and 1-N-((S)-.gamma.-amino-.alpha.-hydroxybutyryl)-6'-N-methyl-3'-deoxykanamycin A. The compounds may be prepared by selective acylation of the 1-amino group of 3'-deoxykanamycin A or 6'-N-methyl-3'-deoxykanamycin A with a corresponding .alpha.-hydroxy-.omega.-amino-alkanoic acid.
摘要:
This invention relates to new processes for the production of a 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-3'-deoxy-5-O-pentofuranosylneamine, including 3'-deoxybutirosins A and B, as a semi-synthetic antibiotic. This invention further relates to new and useful semi-synthetic antibiotics which are produced by the above new processes.