A series of novel 2,5-disubstituted 1,3,4-oxadiazoles 4 have been conveniently synthesized by oxidative cyclization of pyrazolylaldehyde N-acylhydrazones 3 promoted by iodobenzene diacetate under mild conditions (11 examples, up to 92% isolated yields). All the eleven compounds were tested in vitro for their antibacterial activity against Gram-positive bacteria namely, Staphylococcus aureus, Bacillus
通过在温和条件下由
碘代苯二
乙酸酯促进的
吡唑基醛N-酰基hydr酮3的氧化环化反应,可以方便地合成一系列新颖的2,5-二取代的1,3,4-恶二唑4(11个实例,分离产率高达92%)。在体外测试了所有这11种化合物对革兰氏阳性菌,即
金黄色葡萄球菌,
枯草芽孢杆菌和两种革兰氏阴性菌,即大肠杆菌和
铜绿假单胞菌的抗菌活性。还测试了所有合成的化合物对两种真菌的抑制作用。