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.
溴诱导的乳酰胺化反应可促进
乙烯基乙酰羟
肟酸酯的合成,从而合成适合在C(4)位置引入
硫甲基和扩展功能的单环β-内酰胺。对所得的取代N-羟基-2-氮杂
环己酮的拓展允许引入适用于增强抗生素活性的官能化α-
氨基取代基。针对一系列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)和鉴定了有效的新单内酰胺类抗生素。相应的双
邻苯二酚共轭物42 对包括产碳青霉烯酶和碳
头孢菌素酶的鲍曼不动杆菌菌株在内的革兰氏阴性细菌具有出色的活性,这些菌株已被世界卫生组织列为全球性关注的重要问题。