Aroylnitrile oxide cyclizations.<b>1</b>. Synthesis of (3-aroyl-1,2,4-oxadiazol-5-yl)acetic acids
作者:John J. Tegeler、Craig J. Diamond
DOI:10.1002/jhet.5570240330
日期:1987.5
Intrermolecular cyclization of 1,3-dipolar aroylnitrileoxides to malononitrile provided a viable approach to a variety of novel (3-aroyl-1,2,4-oxadiazol-5-yl)acetic acid derivatives.
Synthesis of novel pyrazolo[3,4-<i>d</i>]pyridazine, pyrido[1,2-<i>a</i>]benzimidazole, pyrimido[1,2-<i>a</i>]benzimidazole and triazolo[4,3-<i>a</i>]pyrimidine derivatives
作者:Mohamed R. Shaaban、Taha M. A. Eldebss、Ahmed F. Darweesh、Ahmad M. Farag
DOI:10.1002/jhet.5570450627
日期:2008.11
afford the novel 3-aroyl-4-(5-methyl-1-phenyl-1H-pyrazol-4-yl)carbonyl-1-phenylpyrazole and 3-aroyl-4-(5-methyl-1-phenyl-1H-pyrazol-4-yl)carbonyl isoxazole derivatives, respectively. It reacts also with 1H-benzimidazole-2-acetonitrile, 2-aminobenzimidazole and 3-amino-1,2,4-triazole to afford the novel pyrido[1,2-a]benzimidazole, pyrimido[1,2-a]benzimidazole and the triazolo[4,3-a]pyrimidine derivatives
4-乙酰基-5-甲基-1-苯基-1 H-吡唑与二甲基甲酰胺二甲基乙缩醛(DMF-DMA)反应,得到相应的(E)1-(5-甲基-1-苯基-1 H-吡唑-4-酰基)-3-(N,N-二甲基氨基)-2-丙烯-1-酮。后者产物与亚硝胺和腈氧化物进行区域选择性的1,3-偶极环加成反应,得到新颖的3-芳酰基-4-(5-甲基-1-苯基-1 H-吡唑-4-基)羰基-1-苯基吡唑和3-芳基-4-(5-甲基-1-苯基-1 H-吡唑-4-基)羰基异恶唑衍生物。它也与1 H-苯并咪唑-2-乙腈,2-氨基苯并咪唑和3-氨基-1,2,4-三唑反应生成新型吡啶并[1,2- a]苯并咪唑,嘧啶并[1,2- a ]苯并咪唑和三唑并[4,3- a ]嘧啶衍生物。3-芳酰基-4-(5-甲基-1-苯基-1 H-吡唑-4-基)羰基-1-苯基吡唑衍生物与水合肼的反应生成新的吡唑并[3,4- d ]哒嗪衍生物。
Microwave-assisted Regioselective Synthesis of Novel Bis(azoles) and Bis(azoloazines)
作者:Abdullah S. Al-Bogami、Ahmed E. M. Mekky
DOI:10.1002/jhet.2462
日期:2016.9
We introduce efficient regioselectivesynthesis of a series of novel bis(pyrazoles) and bis(isoxazoles) via 1,3‐dipolar cycloaddition reaction under microwave irradiation. Unequivocal structural assignment of the obtained regioisomers was determined utilizing 1H‐13C HMBC NMR techniques as a valuable tool. A comparative study of the aforementioned reactions was carried out under conventional method
通过微波辐射下的1,3-偶极环加成反应,我们介绍了有效的区域选择性合成一系列新型双(吡唑)和双(异恶唑)的方法。使用1 H- 13 C HMBC NMR技术作为有价值的工具确定了获得的区域异构体的明确结构分配。在常规方法以及微波辐射条件下进行了上述反应的比较研究。
Reactions With Hydrazonoyl Halides 45: Synthesis of Some New Triazolino[4,3‐<i>a</i>]pyrimidines, Pyrazolo[3,4‐<i>d</i>]pyridazines, Isoxazolo[3,4‐<i>d</i>]pyridazines, and Thieno[2,3‐<i>b</i>]pyridines
作者:Abdou O. Abdelhamid、Ali A. Al‐Atoom
DOI:10.1080/00397910500330593
日期:2006.2
Abstract Triazolino[4,3‐a]pyrimidines pyrazolo[3,4‐d]pyridazines and isoxazolo[3,4‐d]pyridazines were synthesized from hydrazonoylhalides. Also, 3‐aminothieno[2,3‐b]pyridines and pyrimidino[4′,5′:4,5]thieno[2,3‐b]pyridines were synthesized from cynothioacetamide. Structures of the newly synthesized compounds were established on the basis of elemental analyses and spectral data.
Microwave assisted regioselective synthesis and 2D-NMR studies of novel azoles and azoloazines utilizing fluorine-containing building blocks
作者:Abdullah S. Al-Bogami、Tamer S. Saleh、Ahmed E.M. Mekky、Mohamed R. Shaaban
DOI:10.1016/j.molstruc.2016.05.064
日期:2016.10
Abstract An efficient regioselectivesynthesis of novel azoles containing a trifluoromethyl moiety via the 1,3-dipolar cycloaddition reaction under microwave irradiation, using fluorine-containing building blocks methodology was achieved. Furthermore, these novel azoles scaffolds have been employed as the starting material in the synthesis of new azoloazines containing a trifluoromethyl group. An unambiguous