摘要:
A novel antibiotic substance of the formula ##STR1## wherein R.sub.1 is CH.sub.3 and R.sub.2 is --CH.sub.2 --CH.sub.2 -- or R.sub.1 is H and R.sub.2 is --CH.dbd.CH--; and R.sub.3 represents hydrogen, lower alkyl or triphenylmethyl,and including the salts of the compound of formula (I) wherein R.sub.3 is hydrogen, said antibiotic substance having strong antibiotic activity and .beta.-lactamase inhibiting effect, and a method for producing the same by aerobic cultivation of Streptomyces A271.
摘要:
Novel antibiotic .beta.-lactam compounds, i.e. 7-oxo-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid derivatives of the following formula ##STR1## wherein R.sub.1 represents a hydrogen atom, a methyl group or a hydroxyl group,R.sub.2 represents a lower alkyl group, a hydroxy lower alkyl group, a lower alkoxy-lower alkyl group, a lower alkanoyloxy-lower alkyl group, a cyclohexyl group, a phenyl group or a 5- or 6-membered aromatic heterocyclic group containing 1 or 2 nitrogen atoms, andR.sub.3 represents a hydrogen atom, a lower alkyl group, or a substituted or unsubstituted aralkyl group containing 7 to 20 carbon atoms,and the salts thereof; processes for production thereof; use thereof as antimicrobial agents; and novel intermediates for production of the compounds of formula (I).
摘要:
A novel antibiotic substance and derivatives thereof, having strong antibiotic activity and .beta.-lactamase inhibiting effect and a method for producing the same by aerobic cultivation of Streptomyces A 271.
摘要:
Novel tylosin derivatives are represented by formula: ##STR1## wherein R represents a hydrogen atom, an acetyl group or a propionyl group; X represents a group --CO-- or --SO.sub.2 --; Y represents a fluorine atom, an acetyl group, a methanesulfonyl group, a methylthio group, a benzoyl group or a methoxy group bound to the benzyl group at the 2-position or 4-position; and Z represents a hydrogen atom or a D-mycinose residue: ##STR2## The tylosin derivatives which are antibiotics of macrolide type provide improved antibacterial activity and improved ability of absorption and excretion in vivo.
摘要:
Disclosed are novel anthracyclinone glycosides represented by the chemical formula ##STR1## wherein R.sup.1 is hydrogen or methyl;R.sup.2 is hydrogen or hydroxyl;R.sup.3 is hydrogen or methoxycarbonyl;R.sup.4 is two hydrogen atoms or an oxygen atom;R.sup.5 is hydrogen, hydroxyl or --OCOX (wherein X is lower alkyl or aralkyl);R.sup.6 is amino, monomethylamino or dimethylamino;R.sup.7 is hydrogen or acetyl; andR.sup.8 is hydrogen or L-cinerulose A ##STR2## but, when R.sup.1 and R.sup.3 are hydrogen and methoxycarbonyl respectively, R.sup.2 is hydrogen; R.sup.4 is two hydrogen atoms; R.sup.5 is hydrogen; R.sup.6 is amino, monoethylamino or dimethylamino; R.sup.7 is acetyl; and R.sup.8 is L-cinerulose A,and their acid addition salts and a method for preparation thereof which consists of treating O-alpha-L-cinerulosyl-(1.fwdarw.4)-O-(3-O-acetyl-2-deoxy-alpha-L-fucosyl)-(1.fwdarw.4)-alpha-L-rhodosamine with corresponding aglycones.
摘要:
A compound represented by the following formula: ##STR1## wherein R.sub.1 represents a hydrogen atom or a hydroxyl group, R.sub.2 represents a group of the formula --CH.sub.2 NO.sub.2, --CN.fwdarw.O or ##STR2## in which A represents a group of the formula ##STR3## in which R.sub.4 represents a hydrogen atom or an alkoxycarbonyl group, R.sub.5 represents a phenyl, alkoxycarbonyl or alkanoyloxymethyl group, R.sub.6 represents an alkyl group and R.sub.7 represents a phenyl, naphthyl, pyridyl, furyl or thienyl group; and R.sub.3 represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group, and a process for production thereof.
摘要翻译:由下式表示的化合物:其中R1表示氢原子或羟基,R2表示式-CH2NO2,-CN-> O或其中A表示式 其中R 4表示氢原子或烷氧基羰基,R 5表示苯基,烷氧基羰基或烷酰氧基甲基,R 6表示烷基,R 7表示苯基,萘基,吡啶基,呋喃基或噻吩基。 R 3表示氢原子或取代或未取代的烃基,及其制造方法。