Synthesis and antimicrobial activity of salicylanilide derivatives. II.
作者:ISAO OZAWA、ISAO TAKEUCHI、KAZUKO YAMAMOTO、YOSHIKI HAMADA、TOMIYOSHI ITO、MASAO KUWAHARA、TATSUO TAKAGAKI
DOI:10.1248/cpb.32.305
日期:——
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。