Convenient method for synthesis of various fused heterocycles via utility of 4-acetyl-5-methyl-1-phenyl-pyrazole as precursor
作者:Sobhi MOHAMED GOMHA、Ahmad SAMI SHAWALI、Abdou OSMAN ABDELHAMID
DOI:10.3906/kim-1311-12
日期:——
A new, less expensive, solvent-free procedure was developed for the synthesis of some new derivatives of various fused heterocyclic ring systems, namely azolopyridazine, azolotriazine, azinotriazine, thienopyridine, and pyrazolopyridine. The structures of the products prepared were established by their spectral data and elemental analyses. Eight compounds were evaluated for their in vitro antimicrobial activity. Some of the tested compounds exhibited moderate to significant antibacterial and antifungal activities.
Synthesis of New Pyrazolo[5,1-c]triazine, Triazolo[5,1-c]triazine, Triazino[4,3-b]indazole and Benzimidazo[2,1-c]triazine Derivatives Incorporating Chromen-2-one Moiety
作者:Mohamed A. Khalil、Samia M. Sayed、Mohamed A. Raslan
DOI:10.5012/jkcs.2013.57.5.612
日期:2013.10.20
The versatile, hitherto unreported 3-(4-(2-phenyldiazenyl)-2-oxo-2H-chromen-3-yl)-3-oxopropanenitrile 3 was prepared by two convenient routes: either by the reaction of ethyl 4-(2-phenyldiazenyl)-2-oxo-2H-chromen-3-carboxylate 2 with acetonitrile in the presence of sodium hydride or by treatment of 4-(2-phenyldiazenyl)-3-(2-bromoacetyl)-2H-chromen-2- one 5 with potassium cyanide. Reaction of 3 with
Convenient and Efficient Method for Synthesis of Bis-Hetaryl Ketones and Evaluation of Their Antimicrobial Activity
作者:Abdou O. Abdelhamid、Sobhi M. Gomha、Waleed A. M. A. El-Enany
DOI:10.1002/jhet.3415
日期:2019.2
Sodium 1‐aryl‐3‐(3‐(ethoxycarbonyl)‐5‐methyl‐1H‐pyrazol‐4‐yl)‐3‐oxoprop‐1‐en‐1‐olate was used as precursor for the preparation of some novel derivatives of various fused azolotriazine ring systems via coupling reactions with hetaryldiazonium salts. Hydrazinolysis of the latter products yielded the corresponding pyrazolopyridazine derivatives. The structures of the products were established by their
Enaminone Incorporating a Dibromobenzofuran Moiety: Versatile Precursor for Novel Azines and Azolotriazines
作者:Sherif M. H. Sanad、Ahmed E. M. Mekky
DOI:10.1002/jhet.3107
日期:2018.4
reaction with acetonitrile derivatives 8a,b and 6‐aminopyrimidin‐4(1H)‐one 13, respectively. On the other hand, the enaminone 3 was taken as a synthetic precursor to synthesize novel pyrazolo[5,1‐c][1,2,4]triazines 21a–c, [1,2,4]triazolo[3,4‐c][1,2,4]triazines 25 and benzimidazo[2,1‐c][1,2,4]triazine 29 containing 5,7‐dibromobenzofuran‐2‐oyl moiety via its coupling with the appropriate diazonium salts
2-乙酰基-5,7-二溴苯并[ b ]呋喃(1)与二甲基甲酰胺-二甲基乙缩醛反应生成相应的(E)-烯氨基酮3,再与芳族重氮氯化物偶合,得到相应的关键中间体3- oxo- 2-( 2-芳基肼基)丙醛6a,b。化合物6a,b用于通过与乙腈反应制备新型3-亚氨基-2-3,2-二氢哒嗪10a,b和6-苯基偶氮吡啶并[2,3 - d ]嘧啶-4(1 H)-one衍生物15a,b。衍生物8a,b和6-氨基嘧啶-4(1 H)-1 13。另一方面,烯胺酮3被用作合成新型吡唑并[5,1– c ] [1,2,4]三嗪21a – c,[1,2,4]三唑并[3,4– c ] [1,2,4]三嗪25和苯并咪唑[ 2,1– c ] [1,2,4]三嗪29通过与适当的a的重氮盐偶联而含有5,7-二溴苯并呋喃-2-油基部分简便的一步法即可得到各种杂原子胺。
Design and Synthesis of Some New Pyrazolo[1,5-<i>a</i>]pyrimidines, Pyrazolo[5,1-<i>c</i>]triazines, Pyrazolo[3,4-<i>d</i>]pyridazines, and Isoxazolo[3,4-<i>d</i>]pyridazines Containing the Pyrazole Moiety
作者:Abdou O. Abdelhamid、Abdelgawad A. Fahmi、Karema N. M. Halim