title: Chemical tailoring of teicoplanin with site-selective reactions.
abstract: Semisynthesis of natural product derivatives combines the power of fermentation with orthogonal chemical reactions. Yet, chemical modification of complex structures represents an unmet challenge, as poor selectivity often undermines efficiency. The complex antibiotic teicoplanin eradicates bacterial infections. However, as resistance emerges, the demand for improved analogues grows. We have discovered chemical reactions that achieve site-selective alteration of teicoplanin. Utilizing peptide-based additives that alter reaction selectivities, certain bromo-teicoplanins are accessible. These new compounds are also scaffolds for selective cross-coupling reactions, enabling further molecular diversification. These studies enable two-step access to glycopeptide analogues not available through either biosynthesis or rapid total chemical synthesis alone. The new compounds exhibit a spectrum of activities, revealing that selective chemical alteration of teicoplanin may lead to analogues with attenuated or enhanced antibacterial properties, in particular against vancomycin- and teicoplanin-resistant strains.
authors.affiliation: Department of Chemistry, Yale University , P.O. Box 208107, New Haven, Connecticut 06520-8107, United States.
authors.forename: Tejas P
authors.initials: TP
authors.lastname: Pathak
authors.forename: Scott J
authors.initials: SJ
authors.lastname: Miller
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D004305:Dose-Response Relationship, Drug; D016983:Enterococcus / Q000187:drug effects*; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D008968:Molecular Conformation; D013329:Structure-Activity Relationship; D017334:Teicoplanin / Q000031:analogs & derivatives / Q000737:chemistry / Q000494:pharmacology*; D020713:Vancomycin Resistance / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents; D017334:Teicoplanin