New cephalosporins with 7-acyl groups derived from .BETA.-ketoacids. II. Further modifications of 7-(3-oxobutyrylamino)-cephalosporins.
作者:MITSUO NUMATA、ISAO MINAMIDA、MASAYOSHI YAMAOKA、MITSURU SHIRAISHI、TOSHIO MIYAWAKI
DOI:10.7164/antibiotics.31.1252
日期:——
New cephalosporins modified in the acyl part of 7-(3'-oxobutyrylamino)cephalosporins (1), which have been described in the preceding paper, were synthesized by thiolation at the 2'-or the 4'-position, or by transforming the 3'-oxo group into a 3'-imino group. The most active compound in vitro was 3-[[(1-methyl-1 H-tetrazol-5-yl)thio]methyl]-7-(4-methylthio-3-oxobutyrylamino)ceph-3-em-4-carboxylic acid (7c), which showed superior in vitro activity against Gram-positive and Gram-negative bacteria compared to the parent cephalosporin (1b) with the same 3-substituent. The ED50 value for 7c, however, was essentially equal to that of 1b in mice infected with Escherichia coli O-111.
新合成的头孢菌素是在7-(3'-氧代丁酰氨基)头孢菌素(1)的酰基部分进行修饰的,通过在2'位或4'位进行硫化,或将3'-氧基转化为3'-亚氨基。体外活性最强的化合物是3-[[(1-甲基-1H-四唑-5-基)硫]甲基]-7-(4-甲基硫-3-氧代丁酰氨基)头孢-3-烯-4-羧酸(7c),与同样有3-取代基的母体头孢菌素(1b)相比,对革兰阳性和革兰阴性细菌表现出更优异的体外活性。然而,在感染大肠杆菌O-111的小鼠中,7c的ED50值与1b基本相同。