The synthesis and antibacterial activity of totarol derivatives. part 1: modifications of ring-C and pro-drugs
作者:Gary B Evans、Richard H Furneaux、Michael B Gravestock、Gregory P Lynch、G.Kenneth Scott
DOI:10.1016/s0968-0896(99)00162-5
日期:1999.9
pro-drugs derived from, the potent antibacterial diterpene totarol (1) were synthesized in order to elucidate the minimum structural requirements for antibacterial activity and to seek compounds with good bioavailability in vivo. These analogues varied in the structural features of their aromatic rings and the prodrugs were O-glycosylated derivatives. They were tested in vitro against three gram-positive
为了阐明抗菌活性的最低结构要求,并寻找在体内具有良好生物利用度的化合物,合成了一系列有效的抗菌二萜酚(1)的类似物和潜在的前药。这些类似物的芳环结构特征各不相同,前药是O-糖基化衍生物。他们在体外针对三种革兰氏阳性细菌进行了测试:β-内酰胺酶阳性和高水平的耐庆大霉素的粪肠球菌,耐青霉素的肺炎链球菌和耐甲氧西林的金黄色葡萄球菌(MRSA);和革兰氏阴性多重耐药肺炎克雷伯菌。没有一个类似物比托他洛尔本身更有效,它在MIC值为7 microM时对这些革兰氏阳性细菌有效。根据结构-活性关系评估了结果,这表明酚部分对于有效的抗菌活性是必不可少的。在前药中,甲苯磺酰α-D-甘露吡喃糖苷(22)在体外被证明是最活跃的(MIC 18 microM)。在小鼠感染模型中评估了化合物1、22和totarolβ-乳糖苷(23)的体内抗菌活性,但发现它们无效。已显示化合物1和22对增殖的人类细胞培养物CH 2983,HeLa和MG