Commercially available vanillin was used as the starting material for the preparation of some new (E)-N’-[4-2-(4-fluorophenylthio)-ethoxy}-3-cyano-5-methoxybenzylidene]-4-substituted benzohydrazide derivatives (8.1 to 8.10) in quantitative yields. The structural confirmations of all the newly synthesized hydrazone derivatives were established on the basis of 1H NMR, mass and IR data. Hydrazides such as (E)-N’-[4-2-(4-fluorophenylthio)ethoxy}-3-cyano-5-methoxybenzylidene]-2,5-dichlorobenzohydrazide (8.6), (E)-N’-[4-2-(4-fluorophenylthio)ethoxy}-3-cyano-5-methoxybenzylidene]-2,5-difluorobenzohydrazide (8.9) showed duplication of NMR signals, this was attributed to the presence of anti and syn periplanar conformers. Antibacterial study against Staphylococcus aureus, Bacillus subtilis, Escherichia coli and Pseudomonas aeruginosa with reference to the standard drug (streptomycin) revealed that compounds bearing R = 4-OH (8.2), 3,4,5-OMe (8.3) and 4-SO2Me (8.4) substituents has shown the good antibacterial sensitivity.
以市售的
香草醛为起始原料,制备了一系列新型的(E)-N’-[4-2-(4-
氟苯硫基)乙氧基}-3-
氰基-5-甲氧基亚苄基]-4-取代苯甲酰
肼衍
生物(8.1至8.10),产率为定量。所有新合成的脎衍
生物的结构确认基于1H NMR、质谱和红外数据。例如(E)-N’-[4-2-(4-
氟苯硫基)乙氧基}-3-
氰基-5-甲氧基亚苄基]-2,5-二
氯苯甲酰
肼(8.6)和(E)-N’-[4-2-(4-
氟苯硫基)乙氧基}-3-
氰基-5-甲氧基亚苄基]-2,5-二
氟苯甲酰
肼(8.9)显示出NMR信号的重复,这归因于反式和顺式periplanar构象的存在。针对
金黄色葡萄球菌、
枯草芽孢杆菌、大肠杆菌和
铜绿假单胞菌的抗菌研究,参考标准药物(
链霉素),结果显示含有R=4-OH(8.2)、3,4,5-OMe(8.3)和4-SO2Me(8.4)取代基的化合物表现出良好的抗菌敏感性。