Synthesis and Antibacterial Activities of 2-Oxaisocephems.
作者:Hidetsugu TSUBOUCHI、Koichi TSUJI、Koichi YASUMURA、Hiroshi ISHIKAWA
DOI:10.1248/cpb.42.2084
日期:——
A series of 2-oxaisocephems with a thio-substituted methyl group at the 3-position and a 2-aminothiazol-4-yl moiety at the 7-position was synthesized via benzyl 3-acetyloxymethyl-7-azido-8-oxo-1-aza-4-oxabicyclo[4.2.0]oct-2-ene-2-carboxylate (2), derived from benzyl acetoacetate (1). The new 2-oxaisocephems were tested for antibacterial activities. Among them, the derivatives having a [2-(2-aminothiazol-4-yl)-2-(Z)-cyclopentyloxyimino]acetamido group at the 7-position characteristically showed potent activities against gram-positive bacteria including methicillin-resistant Staphylococcus aureus (MRSA) and Enterococcus faecalis as compared with cefuzonam and cefmenoxime, which are third-generation cephalosporins.
通过乙酰乙酸苄基酯(1)衍生的 3-乙酰氧甲基-7-叠氮-8-氧代-1-氮杂-4-氧杂双环[4.2.0]辛-2-烯-2-甲酸苄基酯(2),合成了一系列 3-位上有硫代甲基、7-位上有 2-氨基噻唑-4-基的 2-氧代aisocephems。对这些新的 2-氧代aisocephems 进行了抗菌活性测试。与属于第三代头孢菌素的头孢唑喃和头孢甲肟相比,这些在 7 位具有[2-(2-氨基噻唑-4-基)-2-(Z)-环戊基氧基亚氨基]乙酰胺基团的衍生物对革兰氏阳性菌(包括耐甲氧西林金黄色葡萄球菌(MRSA)和粪肠球菌)具有显著的抗菌活性。