Abstract
Halogenation of a suitably protected netilmicin derivative enables preparation of 4'-chloro-, bromo-, and iodo derivatives of netilmicin after deprotection. Suzuki coupling of a protected 4'-bromo derivative with phenylboronic acid or butyltrifluoroborate affords the corresponding 4'-phenyl and 4'-butyl derivatives of netilmicin. Sulfenylation of suitably protected netilmicin derivative with ethanesulfenyl chloride followed by deprotection affords 4'-ethylsulfanylnetilmicin. All netilmicin 4'-derivatives displayed reduced levels of inhibition for prokaryotic ribosomes and reduced antibacterial activity against typical Gram-positive and Gram-negative strains. None of the derivatives displayed enhanced target selectivity.
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