Reactions under Pressure: Synthesis of Functionally Substituted Arylhydrazonal Derivatives as Precursors of Novel Pyridazines and Nicotinates
摘要:
Q-tube assisted multicomponent synthesis of novel arylhydrazonals, pyridazines and nicotinates has been explored. The target molecules have been prepared via one pot reaction of arylhydrazonals with activated methylene nitriles in either ethanolic piperidine, dimethyl acetylene dicarboxylate (DMAD), 1,4-diazobicyclo[2.2.2]octane (DABCO), or Ph3P under pressure. Such conditions make reaction time much shorter and yields higher as compared with those conducted under conventional conditions. The structures of products have been determined by X-ray crystallography and spectroscopic methods.
Non-concerted nucleophilic [4+1] cycloaddition of (dimethylamino)methoxycarbene to arylazonicotinates in the synthesis of pyrazolo[3,4-c]pyridines and pyrazolo[4′,3′:4,5]pyrido[2,3-d]pyrimidines
作者:Haider Behbehani、Hamada Mohamed Ibrahim、Mohamed H. Elnagdi
DOI:10.1016/j.tet.2013.05.040
日期:2013.7
nucleophilic addition of (dimethylamino)-methoxycarbene, generated from DMF-DMA, to the arylazonicotinates 3c–g. The pyridine derivatives 8 were observed to react with ammonia in refluxing acetic acid to yield novel pyrazolo[4′,3′:4,5]pyrido[2,3-d]pyrimidine derivatives 9. Other members of the pyrido[2,3-d]pyrimidine family 13 were synthesized by reactions between 2-amino-5-arylazonicotinate ethyl esters 3a
之间的新的反应的2-氨基-5- arylazonicotinonitriles 3C -克和二甲基甲酰胺二甲基乙缩醛(DMF-DMA),导致了一类新的吡唑并[3,4的形成Ç ] -吡啶衍生物8,已经研制成功。认为该过程是通过未经证实的[4 + 1]环加成途径进行的,该过程涉及从DMF-DMA生成的亲核加成(二甲氨基)-甲氧基卡宾到芳基氮烟酸酯3c – g。观察到吡啶衍生物8与氨在回流的乙酸中反应,生成新的吡唑并[4',3':4,5]吡啶[2,3- d ]嘧啶衍生物9。吡啶并的其他成员并[2,3- d ]嘧啶家族13通过反应之间合成的2-氨基-5- arylazonicotinate乙酯图3a,b和DMF-DMA,即产生脒衍生物10a中,b 经历环化以产生当在回流的乙酸中用氨处理时,相应的吡啶并[2,3- d ]嘧啶13a,b。最后,该努力的结果表明,吡啶并[2,3- d ]嘧啶13a,b也
The anti-breast cancer activity of indeno[1,2-b]pyridin-5-one and their hydrazonal precursors endowed with anti-CDK-2 enzyme activity
作者:Sami A. Al-Hussain、Thoraya A. Farghaly、Mona H. Ibrahim、Mariam A. Al-sheikh、Magdi E.A. Zaki、Zeinab A. Muhammad、Refaie M. kassab