On the Chemistry of Cinnoline I. Synthesis and Reactions of (4-Amino-cinnolin-3-yl)-p-tolyl-methanones
摘要:
The synthesis of a series of (4-Amino-cinnolin-3-yl)-p-tolyl-methanones from aryl-hydrazonomalononitrile in a one step procedure is reported. The (4-amino-cinnolin-3-yl)-p-tolyl- methanones could be annelated to the corresponding 1,2-dihydro-4-(p-tolyl)-2-oxopyrido[3,2-c]cinnoline derivatives via (4-acetamido-cinnolin-3-yl)-p-tolyl-methanones. Treatment of 1,2-dihydro-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline-2-one with POCl3 and P2S5 gave 2-chloro-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline. and 1,2-dihydro-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline-2-thione. Treatment of the ketone with malononitrile afforded 2-amino-3-cyano-9-methyl-4-(p-tolyl)-pyrido[3,2-c]cinnoline. Using these ketones, a facile and convenient route towards substituted pyrimidino[5,4-c]-cinnolines was developed. Chemical and spectroscopic evidences for the structures of the new compounds are presented.
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。
“Clip-cycle” synthesis of 2-pyridazinones bearing enaminonitrile moiety from thioesters and dicyanohydrazones