Structure-activity Relationships of Cephalosporins Having a (Dimethylisoxazolidinio)vinyl Moiety at Their 3-Position.
作者:RYUICHIRO HARAI、KENICHIRO SAKAMOTO、HIROYUKI HISAMICHI、NORIAKI NAGANO
DOI:10.7164/antibiotics.49.1162
日期:——
A series of cephalosporins having a (dimethylisoxazolidinio)vinyl group at their 3-position were synthesized to investigate their structure-activity relationships. With regard to the olefin geometry, the (E)-vinyl compound exhibited higher in vitro activity than the (Z)-compound. Regarding the C-7 substituents, the replacement of 2-aminothiazole with 5-amino-l, 2, 4-thiadiazole increased the anti-pseudomonal activity. Determination of the absolute configuration of the C-3 substituent is also presented. Among the compounds synthesized, we selected 7β-[(Z)-2-(5-amino-l, 2, 4-thiadiazol-3-yl)-2-(fluoromethoxyimino)acetamido]-3-[(E)-2-((S)-2, 2-dimethyl-5-isoxazolidinio)vinyl]-3-cephem-4-carboxylate (YM-40220), which showed well-balanced in vitro activity and an excellent in vivo efficacy against Staphylococcus aureus Smith, as a candidate for further development.
合成了一系列在其3位具有(亚甲基异噁唑啉)乙烯基基团的头孢菌素,以研究其结构-活性关系。关于烯烃几何构型,(E)-乙烯基化合物在体外活性上比(Z)-化合物表现出更高的活性。关于C-7取代基,用5-氨基-1, 2, 4-噻二唑替代2-氨基噻唑可增加抗假单胞菌活性。此外,还展示了C-3取代基的绝对构型的确定。在所合成的化合物中,我们选择了7β-[(Z)-2-(5-氨基-1, 2, 4-噻二唑-3-基)-2-(氟甲氧基亚胺)乙酰氨基]-3-[(E)-2-((S)-2, 2-二甲基-5-异噁唑啉)乙烯]-3-头孢烯-4-羧酸酯(YM-40220),该化合物在体外表现出良好的平衡活性,对金黄色葡萄球菌Smith具有优异的体内疗效,作为进一步开发的候选药物。