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Novel pyrazole tagged pyridine derivatives 5a-n synthesized starting from 3-cyano-4-trifluoromethyl-6- thiophenyl 2(1H) pyridone 1. Compound 1 on hydrolysis followed by decarboxylation resulted in 4-trifluoro-methyl-6- thiophenyl 2(1H)pyridone 2. Compound 2 treated with POCl3 to get 2- chloro-4-trifluoromethyl-6- thiophenyl pyridine 3 further reaction with hydrazine hydrate, which resulted in the formation of compound 4. Compound 4 on reaction with different substituted 1,3-diketones in ethanol reflux condition to afford pyrazole substituted pyridine derivatives 5a-n. All derivatives were tested against Gram-positive and Gram-negative bacterial strains and different Candida strains by well diffusion method, compounds 5k and 5l showed significant activity. The binding mode of 5k and 5l also studied by molecular docking studies.
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从 3-氰基-4-三氟甲基-6-噻吩基 2(1H)吡啶酮 1 开始,合成了新颖的吡唑标记吡啶衍生物 5a-n。化合物 1 经水解和脱羧后得到 4-三氟甲基-6-噻吩基 2(1H)吡啶酮 2。化合物 2 经 POCl3 处理后得到 2-氯-4-三氟甲基-6-噻吩基吡啶 3,再与水合肼反应生成化合物 4。化合物 4 与不同取代的 1,3-二酮在乙醇回流条件下反应,得到吡唑取代的吡啶衍生物 5a-n。所有衍生物都通过井扩散法对革兰氏阳性和阴性细菌菌株以及不同的念珠菌菌株进行了测试,化合物 5k 和 5l 显示出显著的活性。分子对接研究还对 5k 和 5l 的结合模式进行了研究。