摘要:
As new 2'-deamino-2'-hydroxyistamycin B.sub.o derivatives are provided four compounds, namely 2'-deamino-2'-hydroxyistamycin B; 2'-deamino-2'-hydroxy-3-O-demethylistamycin B; 4-N-(.beta.-alanyl)-2'-deamino-2'-hydroxyistamycin B.sub.o ; and 4-N-(.beta.-alanyl)-2'-deamino-2'-hydroxy-3-O-demethylistamycin B.sub.o which all exhibit high antibacterial activity and low acute toxicity in combination. These new compounds are useful as antibacterial agent.
摘要:
As new compounds are provided 3-demethoxyistamycin B and 3-demethoxy-2"-N-formimidoylistamycin B which each is useful as antibacterial agent because of its high antibacterial activity against a wide variety of gram-positive and gram-negative bacteria including mycobacteria. These new compounds may be produced by removal of the 3-hydroxyl group of an N,O-protected 3-O-demethylistamycin B.sub.o, followed by glycylation of the liberated 4-methylamino group and, further, if necessary, followed by formimidoylation of the 2"-amino group of an intermediate N-protected 3-demethoxyistamycin B derivative.
摘要:
A new istamycin A derivative called di-N.sup.6', O.sup.3 -demethylistamycin A exhibits a high antibacterial activity against various bacteria, particularly Pseudomonas aeruginosa. This compound can be prepared by selective acylation of the methylamino group at the 4-position of 1,2',6'-tri-N-protected N.sup.4 -deglycyl-di-N.sup.6', O.sup.3 -demethylistamycin A with glycine or an N-protected derivative thereof, followed by N-deprotection.
摘要:
Now are provided (R)-3,6-diamino-N-(.omega.-aminoalkyl)-hexanamides which are novel compounds having the general formula (I): ##STR1## wherein n stands for 2-5, and which may be for example, (R)-3,6-diamino-N-(2-aminoethyl)hexanamide (n=2) and (R)-3,6-diamino-N-(3-aminopropyl)hexanamide (n=3). Their preparation process is also provided. These novel compounds and acid addition salts thereof have activities inhibitory against Gram-positive bacteria, Gram-negative bacteria and AIDS virus, as well as tumor cells and are chemically stable. These novel compounds and their salts are useful as chemotherapeutic agents for diseases caused by these bacteria or virus and also as antitumor agent.
摘要:
Two new antibiotics which are now nominated as benanomicin A and benanomicin B, respectively, are fermentatively produced by the cultivation of a new microorganism, designated as MH193-16F4 strain, of Actinomycetes. Benanomicins A and B each show antifungal activity and are useful as a therapeutic antifungal agent. A new compound, dexylosylbenanomicin B is now produced by chemical conversion of benanomicin B, and this semi-synthetic antibiotic also shows antifungal activity and is useful as a therapeutic antifungal agent.
摘要:
As new compounds are provided a class of derivatives of actinonin represented by the general formula ##STR1## where R is a hydrogen or a lower alkyl group, which can exhibit the enzyme-inhibitory activities to a limited range of peptidases and show a remarkable enzyme-specificity, and which are effective to treat a cycloheximide-induced experimental amnesia in mice and are expectable to be useful to treat an amnesia in a mammalian animal, including human.
摘要:
This invention relates to a novel 4'-demethyl-4-epipodophylltoxin derivative of the formula: ##STR1## (wherein R.sub.1 is a lower alkyl group; X.sub.1 and X.sub.2 are each a hydroxyl group or an amino group substituted by one or two lower alkyls, provided that either one of X.sub.1 and X.sub.2 is an amino group substituted by one or two lower alkyls and the other is a hydroxyl group) and salts thereof.
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:
A new compound, i.e., 14-chlorodaunomycin, and its method of preparation are provided. The new compound, useful as an antitumor agent and as an intermediate in the preparation of (2"R)-4'-O-tetrahydropyranyladriamycin, is obtained by reaction of daunomycin with an alkyl ortho-formate and a brominating agent to produce a 14-bromo-13-dialkylketaldaunomycin, hydrolysis of the latter compound, then adding an excess of a solid metal/chloride to produce an acid addition salt of 14-chlorodaunomycin and concurrently salting out the latter compound from the reaction solution, followed by recovering the 14-chlorodaunomycin acid addition salt.
摘要:
New antibiotic designated MF266 substance is now obtained from fermentaton of a new microorganism Streptomyces MF266-g4 (desposited under FERM-P 5401 or ATCC 31910). This new substance is useful as antibacterial agent and/or an antitumor agent for the inhibition of experimental animal tumors.