摘要:
WHEREIN R is hydrogen or phenyl, R1 is phenyl or pcarboxyphenyl, and R and R1 taken together with the adjacent carbon atom may represent a 5 to 10 carbon atom cycloalkylidene group. The compounds are prepared by reacting 3-formylrifamycin SV or its 25-desacetyl or hexahydro derivative with a hydrazine of the formula
3-Hydrazonomethyl rifamycin compounds of the following formula and their 25-desacetyl and 16, 17; 18, 19; 28, 29-hexahydro derivatives:
摘要:
A PROCESS IS DECRIBED FOR PREPARING DIRECTLY THE ANTIBIOTIC RIFAMYCIN SV BY FERMENTING NEW MUTANTS OF STRAINS OF STREPTOMYCES MEDITERRANEI. SAID ANTIBIOTIC WAS UP TO NOW OBTAINED THROUGH CHEMICAL TRANSFORMATION, STARTING FROM OTHER RIFAMYCINS, SUCH AS RIFAMYCIN B.
摘要:
WHEREIN R and X have the same meaning as before, and R5 may be the same as R1 under (a), (b) or (c) as given above or it may further represent a -CO-NH-NH2 or a -(R4)-CO-NH-NH2 group wherein R4 has the same meaning as before; or R and R5 taken together may also represent a carbocyclic chain forming with the adjacent -NX-group a 5- to 7-membered heterocyclic ring fused with a benzene nucleus. The compounds have antimicrobial activity.
The compounds are prepared by reacting at a water-liberating temperature 3-formylrifamycin SV or its 25-desacetyl or the corresponding hexahydro derivative in a suitable organic solvent with a substantially equimolar amount of a substituted hydrazine of the formula
and 25-desacetyl and 16, 17; 18, 19; 28, 29-hexahydro derivatives thereof in which X is a -CO-, -CS-, -C(:NH)- or -SO2group, Me is a methyl group, R is hydrogen, R1 is a member of the group consisting of (a) alkyl, alkoxy, aryl and aralkyl groups; (b) an -NR2R3 group wherein R2 and R3 are independently selected from the group of hydrogen, C1-C6 lower alkyl, C3-C6 lower alkenyl, nitro and anilino groups; (c) a -CO-NH-N CH-A or a -(R4)-CO-NH-N CH-A group, wherein R4 is a divalent aliphatic, cycloaliphatic, aromatic or heterocyclic group and A represents the rifamycin SV group:
3-Acylhydrazonomethyl rifamycin SV derivatives, of formula (I)
摘要:
Compositions and methods for controlling viral infections comprising a piperazine compound corresponding to the formula
WHEREIN R represents hydrogen, lower alkyl, lower acyl or phenyl-lower-alkyl; R1, R2, R3 and R4 each represents hydrogen or lower alkyl; each of the pairs R1 and R2 or R3 and R4 may also represent a lower alkylene group bridging the piperazine ring; X is selected from H2, benzylidene and (H, lower acyl); and pharmaceutically acceptable acid addition salts of such compounds.
摘要:
Azine and bis-azine derivatives of 3-formylrifamycin SV of formula (I)
and the corresponding 25-desacetyl and 16, 17; 18, 19; 28, 29hexahydro derivatives wherein Me is methyl; A is (1) a direct bond connecting the 2 nitrogen atoms, or (2) an
wherein y is a -CO-, -CNH-, -CS-, -SO2a divalent aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic group, and R2 and R3 independently are hydrogen, lower alkyl or taken together form an aliphatic divalent chain of 1 to 4 carbon atoms connecting the two terminal nitrogen atoms or (3) a divalent
wherein X is a direct bond between the 2 carbon atoms, a divalent aliphatic, cycloaliphatic, aromatic or a heterocyclic group; and R and R1 may independently be hydrogen, alkyl, cycloalkyl, aryl, heterocyclic or, taken together, form an aliphatic chain of 1 to 8 carbon atoms connecting the 2 terminal carbon atoms.