Synthesis, antibacterial activity and cytotoxicity of new fused pyrazolo[1,5-a]pyrimidine and pyrazolo[5,1-c][1,2,4]triazine derivatives from new 5-aminopyrazoles
作者:Wedad M. Al-Adiwish、M.I.M. Tahir、A. Siti-Noor-Adnalizawati、Siti Farah Hashim、Nazlina Ibrahim、W.A. Yaacob
DOI:10.1016/j.ejmech.2013.04.029
日期:2013.6
with hydrazine hydrate under reflux in ethanol. These compounds were utilized as intermediates to synthesize pyrazolo[1,5-a]-pyrimidines 3a–c, 4a–d, 5a–c, and 6a–c, as well as pyrazolo[5,1-c][1,2,4]triazines 7a–c and 8a–c, by the reaction of 2-[bis(methylthio)methylene]malononitrile, α,α-dicyanoketene-N,S-acetals 1a–b, acetylacetone, acetoacetanilide as well as acetylacetone, and malononitrile, respectively
在已知的α,α-二氰基t烯-N,S-乙缩醛1a - c与水合肼在乙醇中回流的反应中,高产率地制备了新的5-氨基吡唑2a - c。这些化合物被用作合成吡唑并[1,5- a ]-嘧啶3a – c,4a – d,5a – c和6a – c以及吡唑并[5,1- c ] [1,2 ,4]三嗪7a – c和8a – c,分别通过2- [双(甲硫基)亚甲基]丙二腈,α,α-二氰基ene烯-N,S-乙缩醛1a - b,乙酰丙酮,乙酰乙酰苯胺以及乙酰丙酮和丙二腈反应。此外,用戊丹-2,5-二酮环化2a - c可以得到相应的5-吡咯基吡唑9a - c。此外,2a – c与乙酸酐的融合导致相应的1-乙酰基-1 H-吡唑类10a – c。还报道了几种选择的化合物对Vero细胞的抗菌活性和细胞毒性。