Synthesis of new peptidyl imidazodithi(and -thiadi)azoles as potential fungicides.
作者:Lal Dhar S. Yadav、Supriya Shukla
DOI:10.1021/jf00057a038
日期:1995.9
(4-Oxo-3-phenyl-2-thioxoimidazolidin-5-yl) N-aryldithiocarbamates IVa,b obtained by the reaction of 5-bromo-3-phenyl-2-thiohydantoin (II) and ammonium N-aryldithiocarbamates IIIa,b underwent chemoselective intramolecular heterocyclizations with iodine and SOCl2 to yield 2-(arylimino)-6-phenyl-5-thioxoperhydroimidazo[1,5-d][1,3 4]dithiazole-7-thiones Va,b and 3,6-diaryl-2,5-dithioxoperhydroimidazo[5,1-b][1,3,4]thiadiazol Vla,b, respectively. Compounds Va,b and VIa,b were converted into the corresponding 2- and 3-peptidyl derivatives IXa-d and Xa-d Representative compounds IXa,b and Xa,b on dethio-oxygenation furnished the corresponding diones XIa,b and triones XIIa,b. Fungitoxicities of compounds IV-VII and IX-XII were evaluated in vitro against Alternaria solani and Fusarium oxysporum. Some of the compounds displayed activities comparable with that of the commercial fungicide Dithane M-45. Structure-activity relationships for the tested compounds are discussed.
(4-Oxo-3-phenyl-2-thioxoimidazolidin-5-yl) N-aryl二硫代氨基甲酸酯IVa,b,由5-溴-3-苯基-2-硫代水杨酸酐(II)和N-aryl二硫代氨基甲酸铵IIIa,b反应得到,在碘和SOCl2的作用下发生化学选择性分子内杂环化反应,分别生成2-(arylimino)-6-苯基-5-硫代水合咪唑并[1,5-d][1,3 4]二硫杂环庚-7-硫酮Va,b和3,6-二取代苯基-2,5-二硫代水合咪唑并[5,1-b][1,3,4]硫杂环庚Vla,b。化合物Va,b和VIa,b被转化为相应的2-和3-氨基酸衍生物IXa-d和Xa-d。代表性化合物IXa,b和Xa,b在脱硫氧化后生成相应的雙酮XIa,b和三酮XIIa,b。化合物IV-VII和IX-XII对Alternaria solani和Fusarium oxysporum的体外 fungitoxicity进行了评估。一些化合物的活性与商业 fungicide Dithane M-45相当。讨论了测试化合物的结构-活性关系。