摘要:
New antibacterial compounds are provided, including a 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-5,3',4'-trideoxykanamycin B; a 1-N(.alpha.-hydroxy-.omega.-aminoalkanoyl)-5,3',4',641 -tetradeoxykanamycin B; and a 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-5,3',4'-trideoxy-6'-N-methylkanamycin B; as well as 5,3',4',6"-tetradeoxykanamycin B and 5,3',4'-trideoxy-6'-N-methylkanamycin B.
摘要:
Novel antibiotics cleomycins represented by the formula ##STR1## wherein R is a terminal amino residue of the cleomycin. These compounds are useful as a chemotherapeutic agent for treating cancer and bacterial infections.
摘要:
A process for producing threo-3-amino-2-hydroxybutanoylaminoacetic acids comprises the steps of allowing to react a starting compound represented by the general formula: ##STR1## wherein R.sub.1 represents a naphthyl or a group of the formula: ##STR2## in which R.sub.6 and R.sub.7 represent individually hydrogen, halogen, amino or a protected amino, hydroxy or a protected hydroxy, a lower alkoxy or a lower alkyl and R.sub.2 represents a protected amino, with a starting compound represented by the general formula: ##STR3## wherein R.sub.3 represents hydrogen or an ester residue, to obtain threo-3-protected amino-2-hydroxy-4-oxobutanoic acid or its ester represented by the general formula: ##STR4## wherein R.sub.1, R.sub.2 and R.sub.3 have the same meanings as above, and then reducing the same into threo-3-protected amino-2-hydroxybutanoic acid or its ester represented by the general formula: ##STR5## wherein R.sub.1, R.sub.2 and R.sub.3 have the same meanings as above, and further converting the above compound into 3-amino-2-hydroxybutanoic acid represented by the general formula: ##STR6## wherein R.sub.2 ' represents amino or a protected amino, thereafter condensing the same, in a conventional manner for forming a peptide coupling, with a compound represented by the general formula: ##STR7## wherein R.sub.4 represents an alkyl having 3-4 carbon atom or 3-guanidinopropyl, while previously protecting as required those groups not relevant to the reaction, and removing the protecting groups for the functional groups to produce threo-3-amino-2-hydroxybutanoylaminoacetic acids represented by the general formula: ##STR8## wherein R.sub.1 and R.sub.4 have the same meanings as above. This invention also provides the compounds represented by the general formula (III) as novel intermediates for the above aimed compounds and a process for producing the intermediates.
摘要:
A process for preparing bleomycinic acid having a melting point of 228.degree.-230.degree. C. (decomposition) and an analysis of C: 40.80%, H: 5.29%, N: 16.45%, O: 24.78%, S: 4.53%, Cl: 3.37%, and Cu: 4.78% which is characterized by being soluble in water, difficultly soluble in methanol, acetic acid and dimethylsulfoxide, and insoluble in ethanol, ethyl acetate, acetone and ether, and which tests positive to Pauly and Ehrlich reactions but tests negative to ninhydrin, Sakaguchi, Dragendorf, Tollens, ferric chloride, Fehling and Molish reactions, and which has a maximum ultraviolet absorption spectrum at 246 m.mu. and 292 m.mu. and which has an infrared absorption spectrum bands at 3350, 1720, 1670, 1640, 1580, 1460, 1365, 1050, 770 (cm.sup.-1), and which can be hydrolyzed to yield 2'-(2-aminoethyl)-2,4'-bithiazole-4-carboxylic acid, L-threonine, 4-amino-3-hydroxy-2-methyl-.eta.-valeric acid, .beta.-hydroxy-histidine, .beta.-amino-.beta.-(4-amino-6-carboxy-5-methylpyrimidine-2-yl)-propionic acid, L-.beta.-amino-alanine, L-gulose and 3-O-carbamoyl-D-mannose, which comprises hydrolyzing bleomycin in the presence of a mycelium mass or enzyme.
摘要:
A novel physiologically active peptide Val-X-Ala-X, in which X is 4-amino-3-hydroxy-6-methylheptanoic acid, which is prepared from R-Val-Val-X-Ala-X by the action of a microbial enzyme, N-acyl derivatives thereof which are produced by acylating said new peptide, and the processes for producing thereof and the microbial enzyme are disclosed.
摘要:
There are disclosed two new antibiotics formerly denominated MC916-A and MC916-B and now called neothramycin A and neothramycin B which are potent inhibitors of the growth of leukemia cells, e.g. Leukema L-1210 cells in mice. They are produced by controlled fermentation of Streptomyces FERM-P 2452 (A.T.C.C. 31123).
摘要:
Compounds having the general formula ##STR1## (the meanings of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are indicated hereinafter) and the pharmaceutically acceptable salts and esters thereof exhibit strong activities in inhibiting histidine decarboxylase and xanthine oxidase and are useful for treating elevated histamine and uric acid levels. One example is the compound of the formula ##STR2##
摘要:
This invention relates to a process for the preparation of coformycin, 3-(.beta.-D-ribofuranosyl)-6,7,8-trihydroimidazo[4,5-d][1,3]diazepin-8(R)-ol, through a synthetic route from a new derivative of 9.beta.-D-ribofuranosyl-purine and other synthetic intermediates involved in the process and their preparation.
摘要:
New antitumor agents named aclacinomycins A and B, which are anthracycline glycosides and inhibit the growth of various microorganisms e.g., Staphylococcus aureus, Micrococcus flavus, Corynebacterium bovis and inhibit the growth of animal tumors such as leukemia L1210 and P388 and lymphoma 6C3HED in mice and hepatomas in rats are produced by the fermentation of a microorganism belonging to the genus Streptomyces which has been designated Streptomyces galilaeus (MA144-M1 and A.T.C.C. 31133); they are recovered from the broth by conventional methods for recovering antibiotics.
摘要:
By adding a specific amine in culturing under aerobic conditions actinomycetales capable of producing phleomycin group antibiotics, which have been inoculated into a nutrient medium to produce antitumor phleomycin group antibiotics, it is possible to obtain specific phleomycin group antibiotics having a side chain structure corresponding to said amine. The phleomycin group antibiotics thus produced are collected from the culture medium in a conventional way.