Streptogramin derivatives, process of their preparation and compounds containing thereof

摘要

Group A streptogramin derivatives of general formula (I) in which: R₁ represents a halogen atom or an azido or thiocyanato radical, R₂ represents a hydrogen atom or a methyl or ethyl radical, R₃ represents a hydrogen atom, or the residue of an aliphatic, cycloaliphatic, aromatic, araliphatic, heterocyclic or heterocyclylaliphatic ester which may be substituted, and the bond --- represents a single bond (stereochemistry 27R) or a double bond, as well as its salts when they exist