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.
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:
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:
1-N-(L-3-amino-2-hydroxypropionyl)-2',-3'-dideoxykanamycin A and 1-N-(L-4-amino-2-hydroxybutyryl)-2',3'-dideoxykanamycin A are now provided which each is a new compound useful as antibacterial agent. The new compounds each is produced by acylating the 1-amino group of 2',3'-dideoxykanamycin A with L-3-amino-2-hydroxypropionic or L-4-amino-2-hydroxybutyric acid.
摘要:
Tylosin derivatives shown by the general formula ##STR1## wherein R represents a hydrogen atom or a hydroxyl group; R.sub.1 represents a halogen atom, a hydroxyl group, a tetrahydrofuranyloxy group, a tetrahydropyranyloxy group, a tetrahydrothiofuranyloxy group, a tetrahydrothiopyranyloxy group, an alkanoyloxy group, an arylcarbonyloxy group, an aralkylcarbonyloxy group, a lower alkylthiomethyloxy group, a heterocyclic thio group which may have a substituent, a mono- or di- lower alkylamino lower alkylthio group or a group of ##STR2## (wherein R.sub.4 represents a hydroxyl group or an alkanoyloxy group); R.sub.2 represents a hydrogen atom, a hydroxyl group, or an alkanoyloxy group; R.sub.3 represents a hydroxyl group or an alkanoyloxy group; and represents a single bond or a double bond, but represents a double bond when R.sub.2 is a hydrogen atom.These compounds are useful as antibiotics.
摘要:
3',4'-Dideoxy derivative and 1-N-((S)-.alpha.-hydroxy-.omega.-aminoalkanoyl)-3',4'-dideoxy derivative of kanamycin A are now synthetized from kanamycin A and show a wider and/or higher antibacterial activity than the parent kanamycin A so that they are useful in therapeutic treatment of infections by gram-negative and gram-positive bacteria, including drug-resistant strains thereof. The production of these new derivatives may be made by preparing a protected kanamycin A derivative having its 3'- and 4'-hydroxyl groups unprotected and having its all or substantially all other functional groups protected from the initial material, kanamycin A, sulfonylating the 3'- and 4'-hydroxyl groups, removing the 3'- and 4'-sulfonyloxy groups from the resulting 3',4'-di-sulfonic acid ester product to give a 3'-eno-kanamycin A derivative, hydrogenating the 3'-eno-kanamycin A derivative to saturate the 3',4'-unsaturated bond and to yield a protected 3',4'-dideoxykanamycin A product, followed by removal of the remainiing protective groups, and optionally further followed by 1-N-acylation of the 1-amino group of the resulting 3',4'-dideoxykanamycin A with an (S)-.alpha.-hydroxy-.omega.-aminoalkanoic acid or its reactive equivalent.
摘要:
This invention provides a high frequency power module which is incorporated into a mobile phone and which incorporates high frequency portion analogue signal processing ICs including low noise amplifiers which amplify an extremely weak signal therein. A semiconductor device includes a sealing body which is made of insulation resin, a plurality of leads which are provided inside and outside the sealing body, a tab which is provided inside the sealing body and has a semiconductor element fixing region and a wire connection region on a main surface thereof, a semiconductor element which is fixed to the semiconductor element fixing region and includes electrode terminals on an exposed main surface, conductive wires which connect electrode terminals of the semiconductor element and the leads, and conductive wires which connect electrode terminals of the semiconductor element and the wire connecting region of the tab. In such a semiconductor device, a circuit formed in the semiconductor element in a monolithic manner is comprised of a plurality of circuit parts and, in a specified circuit part (a low noise amplifier) which forms a portion of the circuit parts, all grounding electrode terminals out of electrode terminals of the semiconductor element are not connected to the tab through wires but are connected with the leads through wires.