title: Synthesis and in vitro antibiotic activity of 16-membered 9-O-arylalkyloxime macrolides.
abstract: A series of novel 9-O-arylalkyloxime analogs based on three different 16-membered macrolide scaffolds-5-O-mycaminosyltylonolide (OMT), tilmicosin, and 20-deoxy-20-(3,5-dimethyl-1-piperidin-1-yl)-OMT-was synthesized. In vitro antibiotic activities were assayed against Gram-positive Streptococcus pneumoniae and Staphylococcus aureus and Gram-negative Haemophilus influenzae bacterial strains. Analogs derived from OMT (3-15) showed similar or better antibacterial activities against macrolide-susceptible strains and enhanced activities against macrolide-resistant strains compared with erythromycin A, tylosin, or OMT. Similar results were observed for tilmicosin 9-O-arylalkyloxime analogs (18-24). In contrast, most of the 20-deoxy-20-(3,5-dimethyl-1-piperidin-1-yl)-OMT analogs (25-33) showed reduced antibacterial activities compared with OMT. Ribosome-binding studies were performed on compounds 12 (OMT derivative), 20 (tilmicosin derivative), and 29 [20-deoxy-20-(3,5-dimethyl-1-piperidin-1-yl)-OMT derivative]. It was found that these compounds interacted with both domain V and domain II of the Escherichia coli 23S rRNA.
authors.affiliation: Department of Chemistry, Kosan Biosciences Inc., 3832 Bay Center Place, Hayward, CA 94545, USA. fu@kosan.com
authors.forename: Hong
authors.initials: H
authors.lastname: Fu
authors.forename: Saul
authors.initials: S
authors.lastname: Marquez
authors.forename: Xiangrong
authors.initials: X
authors.lastname: Gu
authors.forename: Leonard
authors.initials: L
authors.lastname: Katz
authors.forename: David C
authors.initials: DC
authors.lastname: Myles
mesh_terms: D000478:Alkylation; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D018942:Macrolides / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D008745:Methylation; D015394:Molecular Structure; D010091:Oximes / Q000737:chemistry; D012270:Ribosomes / Q000187:drug effects; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D018942:Macrolides; D010091:Oximes