Novel heterocyclic disazo dyes containing pyrazole and phenylpyrazole. part 1: Synthesis, characterization, solvent polarity and acid-base sensitive characteristics
作者:Aykut Demirçalı
DOI:10.1016/j.molstruc.2021.129960
日期:2021.5
A series of diazotised aniline and aniline derivative compounds were reacted with solution of malononitrile in pyridine at 0–5 °C were obtained 1a-1m compounds. Then 4-arylazo-3,5-diamino-1H-pyrazole (2a-2m) derivatives were synthesized by coupling arylazo malononitrile compounds with hydrazine. Finally, the synthesized pyrazole derivative 2a-2m compounds were again diazotised. By reacting these diazotised
在0〜5℃下,将一系列重氮化的苯胺和苯胺衍生物与丙二腈在吡啶中的溶液反应,得到1a-1m的化合物。然后通过将芳基偶氮丙二腈化合物与肼偶合来合成4-芳基偶氮-3,5-二氨基-1H-吡唑(2a-2m)衍生物。最后,将合成的吡唑衍生物2a-2m化合物再次重氮化。通过使这些重氮化的化合物与3-氨基-5-羟基-1-苯基吡唑反应,得到了新的13种杂环二偶氮染料(3a-3m)加入了染料文献和染料行业。这些新合成的化合物的结构通过元素分析和光谱方法进行表征,例如傅立叶变换红外光谱-原子吸收全反射率(FT-IR-ATR),1 H-核磁共振(1 H NMR)光谱和质谱。然后研究了在二甲基亚砜,二甲基甲酰胺,乙腈,乙酸,甲醇和氯仿中的溶剂变色性质和溶剂作用。此外,研究了有机和无机酸和碱对化合物吸收光谱的影响以及苯环键合基团的取代作用。
Cyclization Reactions of 5-Aminopyrazoles with β-Ketoesters, Enamines and β-Keto Anilides: New Synthetic Routes to Pyrazolo[1,5-a]Pyrimidine Derivatives
作者:F. M. A. El-Taweel、T. M. Abu Elmaati
DOI:10.1002/jccs.200200151
日期:2002.12
The pyrazolo[1,5-a]pyrimidines 4, 10, 11 and 14 were synthesized from reaction of 4-aryazo-2,5-diaminopyrazoles 1 with cyclic β-ketoesters 2a,b or cyclic β-ketoesters 7, 8 or acetoacetanilide 12, respectively. The reaction of 1 with the enamines 15, 16 and 17 yielded also the pyrazolo[1,5-a]pyrimidines 18, 20 and 21, respectively.
Novel Synthesis of Mercaptopurine and Pentaaza-as-Indacene Analogues: Reaction of [Bis(methylthio)methylene]malononitrile and Ethyl 2-Cyano-3,3-bis(methylthio)acrylate with 5-Aminopyrazoles
作者:Galal Eldin Hamza Elgemeie、Samia E. El-Ezbawy、Hosny A. Ali、Abdel-Kader Mansour
DOI:10.1246/bcsj.67.738
日期:1994.3
A novel synthesis of 7-methylthiopyrazolo[1,5-a]pyrimidines via reaction of [bis(methylthio)methylene]malononitrile and ethyl 2-cyano-3,3-bis(methylthio)acrylate with 5-aminopyrazoles is reported and the synthetic potential of the method is demonstrated.