Synthesis and antimicrobial studies of new N,N′-[5,5′-{2,2′-(bis-alkoxy) bis(2,1-phenylene)]bis(4-acetyl-4,5-dihydro-1,3,4-thiadiazole-5, 2-diyl)]diacetamide
作者:MOHAMAD YUSUF、INDU SOLANKI、PAYAL JAIN
DOI:10.1007/s12039-012-0247-z
日期:2012.5
The bisthiadiazolines 4a(a ′ -f ′ ) and 4b(a ′ -f ′ ) built around the various rigid chains have been synthesized in good yields by refluxing bisthiosemicarbazones 3a(a ′ -f ′ ) and 3b(a ′ -f ′ ) in acetic anhydride medium. The reaction of bisaldehydes 2a(a ′ -f ′ ) and 2b(a ′ -f ′ ) with thiosemicarbazide under alcoholic medium yielded 3a(a ′ -f ′ ) and 3b(a ′ -f ′ ) and the former were obtained from the reaction of 2/4-hydroxybenzaldehyde with suitable alkylating agent in the presence of anhydrous K2CO3/dry acetone and Bu4N + I − (PTC). The intermediates and final compounds have been characterized from the rigorous analysis of their IR, 1H-NMR, 13C-NMR, ESI-Mass and elemental analysis. The antibacterial and antifungal activities of the prepared compounds were also evaluated against the Klubsellia pneumoniae, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Bacillius subtilis and Aspergillius janus and Pencillium glabrum strains, respectively. The formation and antimicrobial behaviour of the bisthiadiazolines 4a(a ′ -f ′ ) and 4b(a ′ -f ′ ) are found to be independent of nature of the internal spacer unit.
围绕各种刚性链构建的双硫二氮杂卓4a(a'-f')和4b(a'-f')已通过在醋酐介质中回流双硫半卡巴脒3a(a'-f')和3b(a'-f')以良好产率合成。在醇性介质中双醛2a(a'-f')和2b(a'-f')与硫半卡巴脒反应得到3a(a'-f')和3b(a'-f'),前者由2/4-羟基苯甲醛与适当烷基化剂在无水K2CO3/干燥丙酮和Bu4N+I-(PTC)存在下反应得到。中间体和最终化合物已通过对其IR、1H-NMR、13C-NMR、ESI-质谱和元素分析的严格分析进行表征。还评估了所制备化合物对肺炎克雷伯菌、铜绿假单胞菌、大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌、Janus曲霉和光滑青霉菌株的抗菌和抗真菌活性。发现双硫二氮杂卓4a(a'-f')和4b(a'-f')的形成和抗菌行为与内部间隔单元的性质无关。