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Synthesis of Pyrazolo[5,1–c][1,2,4]triazines, Isoxazolo[3,4-e]pyrazolo-[5,1–c][1,2,4]triazines and Aminopyridones
作者:Kamal U. Sadek、Nadia S. Ibrahim、Mohamed H. Elnagdi
DOI:10.1002/ardp.19883210306
日期:——
Novel pyrazolo[5,1‐c][1,2,4]triazines, isoxazolo[3,4‐e]pyrazolo[5,1‐c]‐[1,2,4]triazines and aminopyridones were synthesised using potassium cyanoacetohydroxamate (1) as starting component.
Regioselectivity in the multicomponent reaction of 5-aminopyrazoles, cyclic 1,3-diketones and dimethylformamide dimethylacetal under controlled microwave heating
The multicomponent reaction of 5-aminopyrazole derivatives with cyclic 1,3-dicarbonyl compounds and dimethylformamide dimethylacetal (DMFDMA) in DMF at 150 °C under controlled microwave heating afforded regioselectively 8,9-dihydropyrazolo[1,5-a]quinazolin-6(7H)-ones 6 rather than the corresponding dihydropyrazolo[5,1-b]quinazolin-8(5H)-ones 4.
Chemoselective Three Component Reactions of 3-Aminopyrazoles, Aldehydes and Malononitrile: Optimize the Structures and Compute the Energies of Possible Tautomers
A chemoselective synthesis of 7-amino-5-aryl-2-hydroxy-3-(aryldiazenylpyrazolo[1,5-a]pyrimidine-6-
carbonitriles and 4-((7-amino-6-cyano-2-hydroxy-5-arylpyrazolo[1,5-a]pyrimidine-3-yl)diazenyl)benzenesulfonamides
through three-component reaction of 3-aminopyrazoles, aldehydes and malononitrile in the presence of base catalysts
such as sodium acetate, pyridine and high surface area MgO is reported. 3-Amino pyrazoles were prepared by refluxing
of ethyl(arylazo) cyanoacetates with hydrazine hydrate in ethanol. Structures of the new compounds were established by
their spectral data and theoretical results. Density Functional Theory (DFT) calculations have been performed to optimize
the structure of products. The theoretical results are in good agreement with experimental findings. The theoretical results
are compared with the experimetal data. DFT calculations reveal that the enol form of 6 is the most stable molecule.
Reaction of (chloro carbonyl) phenyl ketene with 5-amino pyrazolones: Synthesis, characterization and theoretical studies of 7-hydroxy-6-phenyl-3-(phenyldiazenyl)pyrazolo[1,5-a]pyrimidine-2,5(1H,4H)-dione derivatives
Abstract New 7-hydroxy-6-phenyl-3-(phenyldiazenyl)pyrazolo[1,5- a ]pyrimidine-2,5(1 H ,4 H )-dione derivatives were synthesized from the reaction of (chlorocarbonyl)phenyl ketene and 5-amino pyrazolones in high to excellent yields and short reaction times. Structures of the new compounds were fully characterized by their spectral data IR, 1 H NMR, and 13 C NMR and by the theoretical results. Density
摘要 由(氯羰基)苯基乙烯酮与(氯羰基)苯基乙烯酮反应合成了新的7-羟基-6-苯基-3-(苯基二氮烯基)吡唑并[1,5-a]嘧啶-2,5(1 H ,4 H)-二酮衍生物。 5-氨基吡唑啉酮以高到极好的收率和较短的反应时间。新化合物的结构通过其光谱数据 IR、 1 H NMR 和 13 C NMR 以及理论结果进行了充分表征。密度泛函理论 (DFT) 用于优化结构,计算所需产品的能量和振动频率 IR 和 1 H NMR 屏蔽张量。将理论结果与实验数据进行了比较。
Novel Mercaptopurine and Thioguanine Analogues: The Reaction of Dimethyl <i>N</i>‐Cyanodithioiminocarbonate with Oxo‐ and Amino‐diazoles
作者:Siham Y. Alqaradawi、Galal H. Elgemeie
DOI:10.1081/scc-120028352
日期:2004.12.31
A novel and efficient method for the synthesis of a new variety of methylsulfanyl derivatives of azoloazines and azoloazoles by the reaction of dimethyl N-cyanodithioiminocarbonate with diazoles containing oxo-and amino functions. The synthetic potential of the method is demonstrated.