A facile synthesis of pyrrolo[1,2-a]benzimidazoles and pyrazolo[3,4:4′,3′]pyrrolo[1,2-a]benzimidazole derivatives
摘要:
Reaction of 2-cyanomethylbenzimidazole 1 with hydrazonoyl halides 2 led to formation of pyrrolo[1,2-a]benzimidazole derivatives 7. Similar reaction of I with halides 3 afforded 5-amino-4-(benzimidazol-2-yl)pyrazole derivatives 11 or 1-amino-2-arylpyrazolo[3,4:4',3']pyrrolo[1,2-a]benzimidazol-4-one 14 depending on the reaction conditions. The mechanisms of the studied reactions are discussed. (C) 2003 Elsevier Ltd. All rights reserved.
1,3,5-trisubstituted 4,5-dihydro-1H-pyrazole derivatives having CB1-antagonistic activity
申请人:Lange H.M. Josephus
公开号:US20050171179A1
公开(公告)日:2005-08-04
The present invention relates to 1,3,5-trisubstituted 4,5-dihydro-1H-pyrazole derivatives as CB
1
antagonists, to methods for the preparation of these compounds and to novel intermediates useful for the synthesis of said pyrazole derivatives. The invention also relates to the use of a compound disclosed herein for the manufacture of a medicament giving a beneficial effect.
The compounds have the general formula (I)
wherein the symbols have the meanings given in the specification.
Enamines in Heterocyclic Synthesis: A Route to 4-Substituted Pyrazoles and Condensed Pyrazoles
作者:Huwaida M. E. Hassaneen、Hamdi M. Hassaneen、Mohamed H. Elnagdi
DOI:10.1515/znb-2004-1009
日期:2004.10.1
Abstract
The reaction of nitrile imines, generated in situ, from hydrazonoyl halides 3a - e with enamines 2a - c affords pyrazoles 8a - g. These pyrazoles have been used to prepare condensed pyrazoles.
Studies with Functionally Substituted Enamines: The Reactivity of Enaminals and Enamino Esters toward Naphthoquinone, Hydrazonoyl Halides, Aminoazoles and Hippuric Acid
作者:Saad Makhseed、Balkis AL-Saleh、Huwaida M. Hassaneen、Mohamed Hilmy Elnagdi
DOI:10.1055/s-2005-921750
日期:——
yield benzoindole derivatives 7. Enamine 1b reacts with hydrazonoyl halides 8 to yield 3,4-disubstituted pyrazoles 12. On the other hand, the enaminal la failed to react with 8, while enamine ester 1c afforded hydrazone 16 on treatment with 8. The enamino ester 1b afforded triethyl 1,3,5-benzenetricarboxylates on refluxing in acetic acid.
Synthesis, anticonvulsant, and anti-inflammatory evaluation of some new benzotriazole and benzofuran-based heterocycles
作者:Kamal M. Dawood、Hassan Abdel-Gawad、Eman A. Rageb、Mohey Ellithey、Hanan A. Mohamed
DOI:10.1016/j.bmc.2006.01.033
日期:2006.6
derivative reacted with alpha-haloketones and alpha-halodiketones to afford thiophene and thiazole derivatives, respectively. The newly synthesized compounds were found to possess anticonvulsant and anti-inflammatoryactivities with the same mechanism of action of selective COX-2 inhibitors.
Studies on enaminonitriles: A new synthesis of 1,3-substituted pyrazole-4-carbonitrile
作者:Said Ahmed Soliman Ghozlan、Ismail Abdelshafy Abdelhamid、Mohamed Hilmy Elnagdi、Hatem Moustafa Gaber
DOI:10.1002/jhet.5570420623
日期:2005.9
1-p-chlorophenylpyrazole-4-carbonitrile (5a) condensed with hydrazine hydrate to yield the bishydrazone 10 and with dimethylformamide dimethylacetal to yield 1-aryl-3-(3-dimethylamino)acryloyl pyrazole-4-carbonitrile (11). This enamine reacts with hydrazine hydrate to yield the pyrazolylpyrazole (12) and with naphthoquinone to yield the 3-naphthofuranoyl pyrazole 13. The pyra-zolyl pyridine derivative 14
3-二乙基氨基丙烯腈(1)与酰肼卤化物(2a-d)反应,得到1,3-二取代的吡唑-4-腈5a-d。乙酰1- p -chlorophenylpyrazole -4-甲腈(5a中与水合肼缩合),得到双腙10和二甲基甲酰胺二甲基缩醛,得到1-芳基-3-(3-二甲基氨基)丙烯酰基吡唑-4-甲腈(11)。该烯胺与水合肼反应,生成吡唑基吡唑(12),与萘醌反应,生成3-萘呋喃酰基吡唑13。对吡唑-唑基吡啶衍生物14进行如下处理。在乙酸铵存在下用乙酰丙酮11。化合物11被加上p -chlorobenzene氯化重氮,得到腙16,将其用还耦合p -chlorobenzenediazonium酰氯,得到的甲簪18。