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。