Synthesis and antimicrobial activities of some new thiazole and pyrazole derivatives based on 4,5,6,7-tetrahydrobenzothiophene moiety
作者:M.A. Gouda、M.A. Berghot、Ghada E. Abd El-Ghani、A.M. Khalil
DOI:10.1016/j.ejmech.2009.12.020
日期:2010.4
give 5-amino pyrazole derivative 10 upon treatment with hydrazine hydrate. Compound 10 was used as key intermediate for synthesis of pyrazolo[5,1-c][1,2,4]triazine 13a, b, pyrazolo[5,1-a]pyrimidine 14–17 and pyrolo pyrazole 18 derivatives. Finally, condensation of 1 with DMF-DMA afforded the corresponding acryloamide derivative 19, which afforded the corresponding pyrazole derivative 20 upon heating
通过2-(2-氰基-乙酰氨基)-4,5,6,7-四氢-苯并[b]噻吩-3-羧酰胺的反应分两步制备2-(5-氧噻唑啉酮)-氰基乙酰胺衍生物3(1)与异硫氰酸苯酯和氯乙酰氯,在吡啶中与对甲苯基重氮鎓氯化物重氮偶合,得到相应的肼基衍生物4。同样,3与对茴香醛缩合得到相应的芳基衍生物5。用硫酸二甲酯处理2,得到乙烯酮N,S-缩醛9,其得到5-氨基吡唑衍生物10用水合肼处理后。化合物10被用作关键中间体为吡唑并合成咪唑并[5,1-C] [1,2,4]三嗪13A,b,吡唑并[5,1-a]嘧啶14 - 17和pyrolo吡唑18个衍生物。最后,将1与DMF-DMA缩合,得到相应的丙烯酰胺衍生物19,当与水合肼一起加热时,得到相应的吡唑衍生物20。所有新合成的化合物均作为抗微生物剂进行了评估;他们中有些人表现出令人鼓舞的活动。