摘要:
Mycaminosyl tylonolide derivatives represented by the following general formula ##STR1## (wherein R.sup.1 denotes hydroxyl group, a lower alkanoyloxy group, benzoyloxy group, azido group, or amino group which may optionally be substituted with a lower alkyl or a lower alkanoyl radical; R.sup.2 stands for hydrogen atom or hydroxyl group; R.sup.3 expresses hydrogen atom or formyl group; and means a double bond or a radical represented by ##STR2## and salts thereof.
摘要:
2,6-Dideoxy-2-fluoro-L-talopyranose and 1-substituted derivatives thereof, including methyl 2,6-dideoxy-2-fluoro-L-talopyranoside and 3,4-di-O-protected-2,6-dideoxy-2-fluoro-L-talopyranosyl halides, are now provided and these new compounds are useful as intermediates for use in the synthesis of new compounds having antitumor activity, especially 7-O-(2,6-dideoxy-2-fluoro-.alpha.-L-talopyranosyl) daunomycinone or -adriamycinone. 2,6-Dideoxy-2-fluoro-L-talopyranose shows antibacterial activity. 2,6-Dideoxy-fluoro-L-talopyranose and the 1-substituted derivatives thereof may be produced by a multi-stage process starting from L-fucose.
摘要:
New compounds, 2',3'-dideoxy-2'-fluorokanamycin A and 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl) derivatives thereof, particularly 1-N-(DL- or L-3-amino-2-hydroxypropionyl)- and 1-N-(L-4-amino-2-hydroxybutyryl)-2',3'-dideoxy-2'-fluorokanamycins A are now provided, which are each useful as antibacterial agent. 2',3'-Dideoxy-2'-fluorokanamycin A is prepared by a process comprising condensing a 6-azido-4-O-protected-2,3,6-trideoxy-2-fluoro-.alpha.-D-ribo-hexopyranosyl bromide with the 4-hydroxyl group of a 6-O-(2',4',6'-tri-O-protected-3'-N-protected-3'-amino-3'-deoxy-.alpha.-D-glucopyranosyl)-1,3-bis-N-protected-2-deoxystreptamine, reducing the resulting condensation product to convert its azido group into an amino group, and removing the remaining amino-protecting and hydroxyl-protecting groups from the reduction product.
摘要:
A new semi-synthetic antibiotic, 3"-deoxystreptomycin is now provided, which is useful as an antibacterial agent and is produced from 3"-deoxydihydrostreptomycin by a process comprising oxidizing the 3'-hydroxymethyl group of 2,5,6,4",6"-penta-O-acetyl-2"-N-benzyloxycarbonyl-3"-deoxydihydrostreptomycin as prepared by skilled introduction of amino-protecting group and hydroxyl-protecting group of appropriately selected natures into 3"-deoxydihydrostreptomycin, and then removing the protective groups from the oxidation product, 2,5,6,4",6"-penta-O-acetyl-2"-N-benzyloxycarbonyl-3"-deoxystreptomycin.
摘要:
An 1-N-((S)-.alpha.-substituted-.omega.-aminoacyl)-neamine or -ribostamycin of the formula ##STR1## wherein R is a hydrogen atom or .beta.-D-ribofuranosyl group of the formula ##STR2## and R.sub.3 is hydroxyl, amino-NH.sub.2 or acylamino group --NHR.sub.4 in which R.sub.4 is an acyl group, and n is a whole number of 1 to 4, may be produced by subjecting the corresponding O-((S)-.alpha.-substituted-.omega.-aminoacyl)-neamine or -ribostamycin of the formula ##STR3## or its hydroxyl-masked and maino-masked form, to the action of a basic medium to produce an acyl-migration product of the formula: ##STR4## and, optionally converting the amino-masking groups into hydrogen atoms and also the hydroxyl-masking group into hydroge atom in a known manner if said amino-masking groups and said hydroxyl-masking groups are present in the acyl-migration product. The 1-N-((S)-.alpha.-substituted-.omega.-aminoacyl)-neamine or -ribostamycin produced is characterized by its useful activity inhibitory to the growth of bacteria resistant to the parent substance neamine or ribostamycin.
摘要:
An 1-N-((S)-.alpha.-substituted-.omega.-aminoacyl)-neamine or -ribostamycin of the formula: ##STR1## wherein R is a hydrogen atom or .beta.-D-ribofuranosyl group of the formula ##STR2## and R.sub.3 is hydroxyl, amino-NH.sub.2 or acylamino group --NHR.sub.4 in which R.sub.4 is an acyl group, and n is a whole number of 1 to 4, may be produced by subjecting the corresponding O-((S)-.alpha.-substituted-.omega.-aminoacyl)-neamine or -ribostamycin of the formula ##STR3## or its hydroxyl-masked and amino-masked form, to the action of a basic medium to produce an acyl-migration product of the formula: ##STR4## and, optionally converting the amino-masking groups into hydrogen atoms and also the hydroxyl-masking group into hydrogen atom in a known manner if said amino-masking groups and said hydroxyl-masking groups are present in the acyl-migration product. The 1-N-((S)-.alpha.-substituted-.omega.-aminoacyl)-neamine or -ribostamycin produced is characterized by its useful activity inhibitory to the growth of bacteria resistant to the parent substance neamine or ribostamycin.
摘要:
2'-Modified kanamycins, including 2'-deoxykanamycin A, 2'-epikanamycin A and 2'-epikanamycin B, as new compounds are produced starting from kanamycin A by consecutive reaction steps. These new compounds are useful as antibacterial agent.
摘要:
3'-Deoxykanamycin A useful as an antibacterial agent can be produced by a new process comprising reacting a 2',2"-di-O-acylated-3'-O-sulfonylated-tetra-N-protected derivative of kanamycin A with a base such as alkali metal alcoholate in a lower alkanol to effect 2',3'- and 3',4'-epoxidation and concurrently removal of the 2'- and 2"-acyl groups, reducing the resultant N-protected 2',3'-anhydro-3'-epi derivative and 3',4'-anhydro-3'-epi derivative of kanamycin A either with hydrogen in the presence of a known hydrogenation catalyst or with sodium borohydride to afford the corresponding N-protected 3'-deoxygenated derivative of kanamycin A and then removing the residual amino-protecting groups therefrom to give 3'-deoxykanamycin A.
摘要:
New routes are provided for the synthesis of 3',4'-dideoxykanamycin B which is effective in inhibiting kanamycin-resistant organisms from kanamycin B through new intermediate, of which a fundamental process comprises a new reaction of a 3',4'-epoxy derivative of amino- and hydroxyl-protected kanamycin B with a xanthate to form a corresponding 3',4'-dideoxy-3'-eno derivative followed by removal of the amino- and hydroxyl-protecting groups thereof and by hydrogenation of the resulting 3',4'-dideoxy-3'-eno-kanamycin B. A 3',4'-episulfide derivative corresponding to the 3',4'-epoxy derivative which is formed as second product in the reaction of 3',4'-epoxy derivative with xanthate is also used as intermediate for the preparation of 3',4'-dideoxykanamycin B.
摘要:
A number of 1N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-6'N-methyl-3',4'-dideoxykanamycin B derivatives have been found to possess excellent antibacterial activity against most kanamycin susceptible and resistant organisms. In particular, 1N-(DL-isoseryl)-6'N-methyl-3',4'-dideoxykanamycin B, 1N-(L-isoseryl)-6'-N-methyl-3',4'-dideoxykanamycin B, 1N-(L-4-amino-2-hydroxybutyryl)-6'N-methyl-3',4'-dideoxykanamycin B and 1N-(L-5-amino-2-hydroxyvaleryl)-6'N-methyl-3',4'-dideoxykanamycin B, or an acid addition salt thereof possess these highly desirable attributes.