beta-[(1-substituted-4-pyridinio)amino]ceph-3-em-4-carboxylates have been found to be interesting new classes of antibacterial beta-lactams, readily available by SN2 Ar coupling of fluoro-substituted quaternized pyridines and appropriate amino lactam carboxylic acids. Compared to penicillin G, the penam 12c exhibited a spectrum extended to Gram-negative species, such as Escherichia, Shigella, Klebsiella
已经发现6个β-[((1-取代的4-
吡啶基)
氨基] penam-3-
羧酸酯和7个β-[((1-取代的4-
吡啶基)
氨基] ceph-3-em-4-
羧酸酯有趣的新型抗菌β-内酰胺类,可以通过SN2 Ar偶合
氟取代的季
铵化
吡啶和合适的
氨基内酰胺
羧酸来获得。与
青霉素G相比,penam 12c的光谱扩展到革兰氏阴性菌,如埃希氏菌,志贺氏菌,克雷伯菌和肠杆菌,被针对革兰氏阳性菌的效力丧失所抵消。除假单胞菌外,许多头孢实例均显示出对上述革兰氏阴性
生物的优异活性,在某些情况下,例如15i,该光谱包括对葡萄球菌和链球菌的良好表现。由于有沙雷氏菌和许多变形杆菌,