STREPTOGRAMINES, THEIR PREPARATION AND COMPOSITIONS CONTAINING THEM

摘要

The invention concerns derivatives of group A of streptogramines of general formula (I) in which R1 is a -NR'R'' radical in which R' is a hydrogen atom or a methyl radical, and R'' is a hydrogen atom, an alkyl, cycloalkyl, allyl, propynyl, benzyl radical or -OR''', R''' being a hydrogen atom, an alkyl, cycloalkyl, allyl, propynyl or benzyl radical, or -NR3R4, R3 and R4 representing a methyl radical, or forming together with the nitrogen atom to which they are bound a saturated or unsaturated heterocyclic compound with 5 or 6 chains, further capable of containing another heteroatom selected among nitrogen, oxygen or sulphur; R2 is a hydrogen atom or a methyl or ethyl radical, and the bond --- represents a single or double bond, and in which, except if it is specified, the alkyl radicals are linear or branched and contain 1 to 6 carbon atoms, the cycloalkyl radicals contain 3 to 4 carbon atoms, and the chain $(1,3)$ in position 16 means: when R'' is other than -OR''' or -NR3R4, the epimer R or the mixture of epimers R and S in which the epimer R constitutes the major part, and when R'' is -OR''' or -NR3R4, the epimers R and S and their mixtures and their salts. Said novel derivatives are particularly useful as antimicrobial agents, optionally combined with components of group B of streptogramines.