Synthesis and antimicrobial activity of methoxy azachalcones and N-alkyl substituted methoxy azachalconium bromides
作者:CANAN ALBAY、NURAN KAHRİMAN、NAGİHAN YILMAZ İSKENDER、ŞENGÜL ALPAY KARAOĞLU、NURETTİN YAYLI
DOI:10.3906/kim-1007-790
日期:——
In this study, 18 new N-octyl, N-decyl, and N-dodecyl substituted o-, m-, and p-methoxy (E)-3- and 4-azachalcones, 4- or 3-[(1E)-3-(4-, 3-, or 2-methoxyphenyl)-3-oxoprop-1-en-1-yl]-1-alkyl (C_8,10,12}) pyridinium bromides} (1a-6a, 1b-1b, and 1c-6c), and 4 new o-, and m-methoxy (E)-3- and 4-azachalcones (2, 3, 5, and 6) were synthesized and tested for antimicrobial activities against Escherichia coli, Yersinia pseudotuberculosis, Enterobacter aerogenes, Pseudomonas aeruginosa, Staphylococcus aureus, Enterococcus faecalis, Bacillus cereus, and Candida albicans. N-Alkyl substituted azachalconium bromides showed good antimicrobial activity against all tested microorganisms with minimal inhibitory concentration (MIC) values in the range of 0.42-58.7 \mu g/mL in most cases. Nonalkylated compounds 1-9 were not as effective as the alkylated compounds. They showed only antimicrobial activity against gram-positive bacteria and yeast in the range of 1.77-123.7 \mu g/mL. The optimum length of the alkyl chain for better activity is situated with 12 carbon atoms in the series of compounds 1a-c, 2a-c, 3a-c, 4a-c, 5a-c, and 6a-c. N-Alkyl derivatives of m-methoxy (E)-3-azachalcone (4a-c, 5a-c, and 6a-c) showed better activity in comparison to those of o- and p-methoxy (E)-4-azachalcones (1a-c, 2a-c, and 3a-c).
在本研究中,合成了18种新的N-octyl、N-decyl和N-dodecyl取代的o-、m-和p-甲氧基(E)-3-和4-氮杂查尔酮,4或3-[(1E)-3-(4-、3-或2-甲氧基苯基)-3-氧代丙-1-烯-1-基]-1-烷基(C_8,10,12})吡啶鎓溴盐}(1a-6a,1b-1b,和1c-6c),以及4种新的o-和m-甲氧基(E)-3-和4-氮杂查尔酮(2、3、5和6),并对其在抗菌活性方面进行了测试,针对的微生物包括大肠杆菌、假性结核分枝杆菌、肠道气单胞菌、铜绿假单胞菌、金黄色葡萄球菌、肠球菌、蜡样芽孢杆菌和白色念珠菌。N-烷基取代的氮杂查尔酮溴化物显示出良好的抗菌活性,针对所有测试的微生物,其最小抑菌浓度(MIC)值在0.42-58.7 μg/mL范围内。在大多数情况下,未烷基化的化合物1-9的效果不如烷基化化合物。它们仅显示出对革兰阳性细菌和酵母的抗菌活性,浓度范围为1.77-123.7 μg/mL。为了获得更好的活性,烷基链的最佳长度为12个碳原子,在化合物系列1a-c、2a-c、3a-c、4a-c、5a-c和6a-c中。与o-和p-甲氧基(E)-4-氮杂查尔酮(1a-c、2a-c和3a-c)相比,m-甲氧基(E)-3-氮杂查尔酮的N-烷基衍生物(4a-c、5a-c和6a-c)显示出更好的活性。