The condensation of 4-halo-o-toluidine with salicylic acid or 5-halosalicylic acid was carried out by the use of phosphorus trichloride in xylene to obtain the salicylanilides 1-13, 4-Halo (or nitro)-o-toluidine, 4-halo-o-nitroaniline or 2, 4-dihaloaniline was condensed with 3, 5-dihalosalicylic acid to provide the salicylanilides 14-30 by the same method. The salicylanilides 2-15, 26 and 27 gave the acetylated compounds 31-46 on treatment with acetic anhydride and pyridine. The salicylanilides 26 and 27 gave the methylated compounds 47 and 48 on treatment with dimethyl sulfate. In the antimicrobial activity tests of the synthesized compounds, 4', 5-dihalo-2'-methylsalicylanilides 1-13 and the acetylated compounds 31-42 showed strong antimicrobial activity against some Eumycetes at the minimum inhibitory concentration (MIC) of 0.8 μg/ml. Compound 3 was shown to have a strong preventive activity against downy mildew of cucumber.
用
三氯化磷在二
甲苯中缩合 4-卤代
邻甲苯胺与
水杨酸或 5-卤代
水杨酸,得到
水杨酰苯胺 1-13;用同样的方法缩合 4-卤代(或硝基)
邻甲苯胺、4-卤代-
硝基苯胺或 2,4-二卤
苯胺与 3,5-二卤
水杨酸,得到
水杨酰苯胺 14-30。
水杨酰苯胺 2-15、26 和 27 经
乙酸酐和
吡啶处理后得到乙酰化化合物 31-46。用
硫酸二甲酯处理
水杨酰苯胺 26 和 27 后,可得到甲基化化合物 47 和 48。在合成化合物的抗菌活性测试中,4', 5-二卤-2'-甲基
水杨酰苯胺 1-13 和乙酰化化合物 31-42 对一些真菌有很强的抗菌活性,最低抑菌浓度(MIC)为 0.8 μg/ml。化合物 3 对黄瓜霜霉病具有很强的预防活性。