1,2,4‐Triazino[5,6‐b]indoles and their derivatives are prepared by the cyclisation of isatin 3‐thiosemicarbazone (1) followed by condensation and displacement reactions. Condensations of 3‐hydrazino‐1,2,4‐triazino[5,6‐b]indole (4) with ethoxymethylenemalononitrile, ethyl ethoxymethylenecyanoacetate, acetylacetone and methyl bis(methylmercapto)methylenecyanoacetate yield the corresponding 3‐pyrazolo‐1
1,2,4 - 三嗪基 [5,6 - b]
吲哚及其衍
生物是通过
靛红 3 -
氨基
硫脲 (1) 环化,然后进行缩合和置换反应制备的。3-
肼基-
1,2,4-三嗪基[5,6-b]
吲哚(4)与
乙氧基亚甲基丙二腈、乙氧基亚甲基乙
氰基
乙酸乙酯、
乙酰丙酮和双(甲基巯基)亚甲基
氰基
乙酸甲酯缩合得到相应的3-1,2,4 -Triazino [5,6-b]
吲哚 6-9。在与
甲酸、酸性或
亚硝酸反应时,
肼 4 进一步转化为高级杂环 10-12。