A general route for the synthesis of a novel class of pyridazin-3-one derivatives 3 by the reaction in acetic anhydride between 3-oxo-2-arylhydrazonopropanals 1 and some active methylene compounds like p-nitrophenylacetic acid and cyanoacetic acid was established. Under these conditions the pyridazin-3-one derivatives 3 were formed as the sole isolable products in excellent yield. The 6-acetyl-3-oxopyridazine derivative 3l was reacted with DMF-DMA to afford the corresponding enaminone derivative 4, which reacts with a variety of aminoazoles to afford the corresponding azolo[1,5-a]pyrimidine derivatives 5–7. Also, in order to explore the viability and generality of a recently uncovered reaction between 3-oxo-2-arylhydrazonopropanals and active methylene compounds, a variety of 2-amino-6-aryl-5-arylazo-3-aroylpyridines 16–19 were prepared by reacting 3-oxo-2-arylhydrazonopropanals with miscellaneous active methylene compounds like 3-oxo-3-phenylpropionitrile, hetaroylacetonitriles and cyanoacetamides. These 2-aminopyridine derivatives undergo smooth reactions with cyanoacetic acid that led to the formation in high yield of a new class of 1,8-naphthyridine derivatives 24. The structures of all new substances prepared in this investigation were determined by the different analytical spectroscopic methods, in addition to the X-ray crystallographic analysis.
通过在
醋酸酐中将3-氧-2-芳基腙
丙醛1与一些活性亚甲基化合物(如
对硝基苯乙酸和
氰基
乙酸)反应,建立了一种合成新型
吡嗪-3-酮衍
生物3的通用路线。在这些条件下,
吡嗪-3-酮衍
生物3作为唯一可分离的产物,以优异的产率形成。6-乙酰-3-氧
吡嗪衍
生物3l与
DMF-DMA反应,生成相应的烯胺酮衍
生物4,后者与多种
氨基
杂环化合物反应,形成相应的杂氮[1,5-a]
吡啶衍生物5–7。此外,为了探讨近期发现的3-氧-2-芳基腙
丙醛与活性亚甲基化合物之间反应的可行性和普遍性,通过将3-氧-2-芳基腙
丙醛与多种活性亚甲基化合物(如3-氧-3-苯
丙腈、杂芳基
丙酮腈和
氰基乙酰胺)反应,合成了一系列2-
氨基-6-芳基-5-芳基氮杂-3-芳酰
吡啶衍生物16–19。这些2-
氨基
吡啶衍生物与
氰基
乙酸发生顺利反应,导致新一类
1,8-萘啶衍
生物24的高产率形成。本研究中制备的所有新物质的结构均通过不同的分析光谱方法确定,此外还进行了X射线晶体分析。