Bromine induced lactamization of vinyl acetohydroxamates facilitated syntheses of monocyclic β-lactams suitable for incorporation of a thiomethyl and extended functionality at the C(4) position. Elaboration of the resulting substituted N-hydroxy-2-azetidinones allowed incorporation of functionalized α-amino substituents appropriate for enhancement of antibiotic activity. Evaluation of antibacterial activity against a panel of Gram-positive and Gram-negative bacteria revealed structure-activity-relationships (SAR) and identification of potent new monobactam antibiotics. The corresponding bis-catechol conjugate, 42, has excellent activity against Gram-negative bacteria including carbapenemase and carbacephalosporinase producing strains of Acinetobacter baumannii which have been listed by the WHO as being of critical concern worldwide.
乙酰羟
肟酸
乙烯酯的
溴诱导内酰胺化促进了适合在 C(4) 位加入
硫代甲基和扩展官能团的单环 β-内酰胺的合成。对所得取代的 N-羟基-
2-氮杂环丁酮进行细化,可加入适合增强抗生素活性的官能化 α-
氨基取代基。对一组革兰氏阳性和革兰氏阴性细菌的抗菌活性评估揭示了结构-活性-关系(
SAR),并确定了强效的新型单内酰胺类抗生素。相应的双
邻苯二酚共轭物 42 对革兰氏阴性菌(包括产生碳青霉烯酶和碳头孢烯酶的鲍曼不动杆菌菌株)具有出色的活性,这些菌株已被世界卫生组织列为全球严重关切的问题。