| 摘要 |
<p>There are provided 3-azinomethyl rifamycins of the formula I: (I) < IMG > wherein R represents hydrogen or acetyl: R1 represents hydrogen or lower alkyl; R2 represents an alkyl group having from 2 to 4 carbon atoms substituted by a dialkoxy group each having from 1 to 3 carbon atoms; R3 represents an aklyl group having from 1 to 4 carbon atoms; R2 and R3 may form with the amino nitrogen atom a 4- to 8membered heterocyclic ring, having a maximum of two hetero atoms, substituted by hydroxy-, alkoxy-, dialkoxy- or alkylenedioxy groups each having from 1 to 4 carbon atoms, arylalkoxyimino groups having from 7 to 9 carbon atoms, acyloxy groups having from 1 to 4 carbon atoms; R1 and R2 may form with the amino nitrogen atom and the carbon atom a 5 to 7-membered heterocyclic ring optionally substituted by alkyl or alkoxy group having from 1 to 4 carbon atoms. The compounds display antibacteria activity against Gram-positive and Gram-negative bacteria and Mycobacteria.</p> |
