New rifamycins modified at positions 3 and 4. Synthesis, structure and biological evaluation.

Abstract
A number of semisynthetic rifamycin derivatives modified at positions 3 and/or 4, belonging to general structures 3, 5 and 6 was prepared. The synthesis, structure and antimicrobial evaluation of the new compounds are described. All the derivatives have in vitro antibacterial activities comparable with that of rifampicin.

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