Abstract

Antibacterial SAR for a series of macrolides derived from erythromycin A that are potent LHRH antagonists was developed in an attempt to eliminate the antibiotic activities of these compounds. Increasing the size of the alkyl substituents on the desosamine 3′-amine resulted in potent LHRH antagonists that were inactive against staphylococcal bacteria strains, and were significantly (>10-fold) less active against streptococcal bacteria strains. Complete elimination of antibacterial activities could be achieved by replacement of one or both methyl groups on the 3′-amine with a large alkyl substituent.

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