Antibacterial activity and polarographic half-wave reduction potential of 2-nitrobenzo(b)furans.
作者:YOSHITAKA OHISHI、KIYOSHI KURIYAMA、YOSHIO DOI、TERUO NAKANISHI
DOI:10.1248/cpb.33.2854
日期:——
The antibacterial activities of a series of 2-nitrobenzo [b] furan derivatives against St. aureus, B. subtilis, E. coli, Sal. typhimurium, Sal. enteritidis, Sh. flexneri, Pr. vulgaris or Ps. aeruginosa were determined in vitro. Most of the compounds showed considerable activities against the bacteria except Pr. vulgaris and Ps. aeruginosa and one of them was about 30 times as active as nitrofurantoin against St. aureus. Mono- and dimethoxy derivatives (2a, 3a, 4a, 5f) were the most active. The polarographic half-wave potentials (E1/2) of the 2-nitrobenzo [b] furans at pH 7 were in a narrow range of -0.450±0.04 V, whereas the E1/2 values of regioisomeric nitrobenzo [b] furans were more negative (-0.560--0.726 V). In the case of 2-nitrobenzo [b] furans, substituent (s) on the benzene ring had little influence on the reduction potential of the 2-nitro group, whereas the antibacterial activity depended markedly on the substituent group (s).
一系列2-硝基苯并[b]呋喃衍生物对金黄色葡萄球菌、枯草芽孢杆菌、大肠杆菌、鼠伤寒沙门氏菌、肠炎沙门氏菌、弗氏志贺菌、普通变形杆菌或铜绿假单胞菌的抗菌活性在体外被测定。大多数化合物对这些细菌显示出显著的活性,除了普通变形杆菌和铜绿假单胞菌,它们中的一种对金黄色葡萄球菌的活性大约是呋喃西林的30倍。单甲氧基和二甲氧基衍生物(2a, 3a, 4a, 5f)最为活跃。在pH 7时,2-硝基苯并[b]呋喃的极谱半波电位(E1/2)在一个狭窄的范围内,为-0.450±0.04 V,而区域异构的硝基苯并[b]呋喃的E1/2值更为负(-0.560至-0.726 V)。对于2-硝基苯并[b]呋喃来说,苯环上的取代基对2-硝基基团的还原电位几乎没有影响,然而抗菌活性明显取决于取代基团。