Amides of de-acetylglucosaminyl-deoxy teicoplanin active against highly glycopeptide-resistant enterococci. Synthesis and antibacterial activity.
作者:ADRIANO MALABARBA、ROMEO CIABATTI、JÜRGEN KETTENRING、PIETRO FERRARI、ROBERTO SCOTTI、BETH P. GOLDSTEIN、MAURIZIO DENARO
DOI:10.7164/antibiotics.47.1493
日期:——
Removal, by selective reduction, of the acetylglucosamine from teicoplanin A2-2 (CTA/2) produced the 34-de(acetylglucosaminyl)-34-deoxy pseudoaglycone (II). This compound was more active in vitro than CTA/2 against coagulase-negative staphylococci (CNS). Amide derivatives obtained by condensation of the carboxyl group of II with primary amines were particularly active against Streptococcus pyogenes
通过选择性还原从替考拉宁A2-2(CTA / 2)中除去乙酰氨基葡糖,产生了34-脱(乙酰氨基葡萄糖基)-34-脱氧假糖苷配基(II)。与CTA / 2相比,该化合物对凝血酶阴性葡萄球菌(CNS)的体外活性更高。通过II的羧基与伯胺的缩合获得的酰胺衍生物对化脓性链球菌特别有活性,并且对高耐替考拉宁和万古霉素的VanA肠球菌具有一定的体外活性。其中,具有支链四胺的羧酰胺(VII)也比相应的替考拉宁酰胺对CNS具有更好的活性。相反,II的二甲基酰胺(VIII)对VanA肠球菌几乎没有活性。II的二级羧酰胺的七肽骨架的总体结构与CTA / 2及其酰胺衍生物中的相同,而在脱氧假糖苷配基II和其叔酰胺VIII中,51,52-肽键与原始结构发生构象变化顺式至顺式取向。II和二甲酰胺VIII的仲酰胺之间的这种差异反映在它们不同的抗菌谱上。还描述了通过与硼氢化钠反应从母体CTA / 2-酰胺直接合成脱氧假