Synthesis and molluscicidal activity of some new thiophene, thiadiazole and pyrazole derivatives
作者:Ahmed A. Fadda、E. Abdel-Latif、Rasha E. El-Mekawy
DOI:10.1016/j.ejmech.2008.09.006
日期:2009.3
thiocarbamoyl derivative 3. Reaction of the intermediate 2 with phenacyl bromide, ethyl bromoacetate, chloroacetonitrile, chloroacetyl chloride, bromodiethyl malonate and chloroacetone afforded the corresponding thiophene derivatives 5, 8, 15 and 17. The thiocarbamoyl derivative 3 reacts with arylazophenacyl bromide and/or hydrazine hydrate to afford the corresponding thiadiazole and pyrazole derivatives 20a–c
苯甲酰基丙酮1与异硫氰酸苯酯的碱催化反应产生了不可分离的中间体2。用稀HCl处理2得到相应的硫代氨基甲酰基衍生物3。中间的反应2与苯甲酰甲基溴,溴乙酸乙酯,氯乙腈,氯乙酰氯,丙二bromodiethyl和氯丙酮,得到相应的噻吩衍生物5,8,15和17。硫代氨基甲酰基衍生物3与芳基偶氮苯甲酰溴和/或水合肼反应,得到相应的噻二唑和吡唑衍生物20a – c和22。这些新合成的化合物通常对亚历山大草(Biomphalaria alexandrina)蜗牛表现出中等的杀软体动物活性。