[EN] N-(3-RIFAMYCINYL)-CARBAMATES, METHOD OF PREPARING THEM AND THEIR USE FOR TREATING AND PREVENTING TUBERCULOSIS [FR] CARBAMATES-N-(3-RIFAMYCINYL), PROCEDE DE PREPARATION DE CES DERNIERS ET LEUR UTILISATION DANS LE TRAITEMENT ET LA PREVENTION DE LA TUBERCULOSE
申请人:Archifar Industrie Chimiche del Trentino S.p.A.
公开号:US04007169A1
公开(公告)日:1977-02-08
Method of preparing 3-amino-Rifamycin S and 3-azido-Rifamycin S and 25-desacetyl derivatives thereof having antibiotic activity. According to such a method, Rifamycin S is dissolved in dipolar aprotic solvent and reacted with sodium azide.
Method of preparing 3-amino-rifamycins S and SV having antibiotic activity. According to such a method a 3-bromo-rifamycin S is reacted with sodium nitrite to give 3-nitro-rifamycin S which is reduced with zinc powder to give the 3-amino-rifamycin SV from which the 3-amino-rifamycin S can be obtained by treatment with an oxidating agent.
The invention disclosed herein provides a method of treating an animal infected by hepatitis B virus comprising administering to such infected animal an amount of a rifamycin derivative selected from a group consisting of (a) 3-amino-4-deoxo-4-imino-rifamycin S, (b) 3-amino-4-deoxo-4-[(4-aminophenyl)sulfonyl]amino-rifamycin SV, (c) 4-O-(n-butylsulfonyl)-3-[(1-piperidinylimino)methyl]-rifamycin SV, (d) 4-O-(n-butylsulfonyl)-3-[(4-morpholinylimino)methyl]-rifamycin SV, (e) 3-[(dimethylhydrazono)methyl]-4-O-[(3-phenylpropyl)sulfonyl]-rifamycin SV, and (f) 4-deoxo-N,3-ethylidenimino-4-(methylsulfonyl)amino-rifamycin SV, said amount being effective to alleviate the effects of said hepatitis B virus. Also disclosed is a method of inhibiting the viral polymerase of hepatitis B virus by subjecting said polymerase to an amount of one of the rifamycin derivatives (a)-(f) above, said amount being effective to prevent the synthesis of hepatitis B virus by said viral polymerase. Compounds (b)-(f) described above are novel compounds.
Novel rifamycin compounds having high antibiotic activity. Such compounds are obtained by reacting 3-amino-rifamycin SV with an aldehyde, particularly an aliphatic or cycloaliphatic aldehyde.