A series of lipophilic teicoplanin pseudoaglycon derivatives, including alkyl-, aryl-, calixarene- and protected sugar-containing conjugates, were prepared using azide-alkyne click chemistry. Out of the conditions applied, the CuSO4-ascorbate reagent system proved to be more efficient than the Cu(I)I-Et3N-mediated reaction. Some of the new compounds have high in vitro activity against glycopeptide-resistant
We show here that a series of triazolyl glycolipid derivatives modularly synthesized by a "click" reaction have the ability to increase the susceptibility of a drug-resistant bacterium to beta-lactam antibiotics. We determine that the glycolipids can suppress the minimal inhibitory concentration of a number of ineffective beta-lactams, upward of 256-fold, for methicillin-resistant Staphylococuss aureus (MRSA). The mechanism of action has been preliminarily probed and discussed.
Nikitin,V.I. et al., Journal of Organic Chemistry USSR (English Translation), 1975, vol. 11, p. 272 - 277