Zobrazeno 1 - 10 of 50 pro vyhledávání: '"Yusria R. Ibrahim"'
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Novel Synthesis of 1,3-Thiazine and Pyrimidinethione Derivatives from (1-Aryl ethylidene)hydrazinecarbothioamides and Tetracyanoethylene
Autor: Essmat M. El-Sheref, Alaa A. Hassan, Yusria R. Ibrahim, Stefan Bräse
Publikováno v: Journal of Heterocyclic Chemistry. 53:876-881
1,3-Thiazine-5,6,6-tricarbonitrile and 2-thioxo-2,3-dihydropyrimidine-4,5-dicarbonitriles derivatives were synthesized via interactions between (1-aryl ethylidene)hydrazinecarbothioamides and tetracyanoethylene to give the derivatives of tetracyanoet
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9ac8fe13562a9048370088b2486e0b32
https://doi.org/10.1002/jhet.2350
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3
A Facile Synthesis of Oxoindenothiazine and Dioxospiro(indene-2,4′-thiazine) Derivatives from (Substituted ethylidene)hydrazinecarbothioamides
Autor: Mahmoud A. A. Ibrahim, Stefan Bräse, Essmat M. El-Sheref, Yusria R. Ibrahim, Alaa A. Hassan
Publikováno v: Journal of Heterocyclic Chemistry. 52:1201-1207
(E)-2-[2-(1-Substituted ethylidene)hydrazinyl]-5-oxo-9b-hydroxy-5,9b-dihydroindeno[1,2-d][1,3]-thiazine-4-carbonitriles and (E)-5-oxo-[(E)-(1-substituted ethylidene)hydrazinyl]-2,5-dihydroindeno[1,2-d][1,3]thiazine-4-carbonitriles have been obtained
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9485578f6ebc65137b9a202a20f40e20
https://doi.org/10.1002/jhet.2234
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4
Synthesis ofN-Substituted(Thiazol-2-ylidene)pyrazol-5-amine Derivatives via Condensation of Pyrazolylthioureas with ω-Bromoacetophenones
Autor: Essmat M. El-Sheref, Ashraf A. Aly, Alan B. Brown, Alaa A. Hassan, Yusria R. Ibrahim
Publikováno v: Journal of Heterocyclic Chemistry. 51:610-617
1-Substituted 3-[3-methyl-1H-pyrazol-5-yl]thioureas react with ω-bromoacetophenones forming N-substituted(thiazol-2-ylidene)pyrazol-5-amine derivatives. Rational for these conversations are presented.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e3c3a2903329a55bbe704100e083ce12
https://doi.org/10.1002/jhet.1793
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5
Reactions of Dimethyl Ethynedicarboxylate with (Substituted Ethylidene)hydrazinecarbothioamides
Autor: Essmat M. El-Sheref, Yusria R. Ibrahim, Alaa A. Hassan, Ashraf A. Aly, Takehiko Yamato
Publikováno v: Journal of Heterocyclic Chemistry. 50:473-477
The reaction of (substituted ethylidene)hydrazinecarbothioamides 4a, 4b, 4c, 4d, 4e, 4f, 4g with dimethyl ethynedicarboxylate (DMAD, 2) gave [(substituted ethylidene)hydrazono)-4-oxothiazolidine-5-ylidene]acetates 7a, 7b, 7c, 7d, 7e, 7f, 7g (71–88
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::991a4afdc78d0a80c80d174827d28a60
https://doi.org/10.1002/jhet.712
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7
Novel Synthesis of Pyrazolyloxothiazolidine Derivatives
Autor: Yusria R. Ibrahim, Essmat M. El-Sheref, Ashraf A. Aly, Alaa A. Hassan, Alan B. Brown, Stefan Bräse
Publikováno v: Journal of Heterocyclic Chemistry. 49:1380-1385
1-Substituted 3-[3-(methyl/phenyl)-1H-pyrazol-5-yl]thioureas react with the triple bond of dimethyl acetylenedicarboxylate forming (Z)-methyl 2-[(Z)-3-substituted-2-(3-(methyl/phenyl-1H-pyrazol-5-ylimino)-4-oxothiazolidin-5-ylidene)acetates. Rational
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a70c5b5519dcc2a8cabe0221d674b371
https://doi.org/10.1002/jhet.1023
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8
Novel Synthesis of Oxothiazolidine Derivatives
Autor: Alan B. Brown, Yusria R. Ibrahim, Essmat M. El-Sheref, Alaa A. Hassan
Publikováno v: Journal of Heterocyclic Chemistry. 49:1054-1058
(Z)-Methyl 2-[3-(arylideneamino)-2-(arylidenehydrazono)-4-oxothiazolidin-5-ylidene]acetate prepared during the reaction between thiocarbonohydrazides and dimethyl acetylene dicarboxylate. Rational for there conversations involving the nucleophilic ad
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1758e1aed6661c03aa717d10648eea38
https://doi.org/10.1002/jhet.935
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9
An Efficient Synthesis of 1-Thia-5-azaspiro[5.5]undec-2-ene and its Recyclization to 1,5-Diazaspiro[5.5]undec-2-ene and/or Spiro-Thieno[2,3-d]pyrimidin-4(1H)-one Derivatives
Autor: Asmaa Hamoda, Fathy F. Abdel-Latif, Raafat M. Shaker, Kamal M. El-Shaieb, Yusria R. Ibrahim
Publikováno v: Zeitschrift für Naturforschung B. 66:487-492
Spiro-heterocyclic compounds are well known to posses various pharmacological activities, and hence their synthesis has always been a challenge and of attraction to organic chemists. These compounds may display pronounced antimicrobial [1], analgesic
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::40d9b00fb68c3553454bc243d9fcfdb3
https://doi.org/10.1515/znb-2011-0508
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10
Synthesis of 2,2'-(1,4-Phenylene)bis-3,4-dihydro-2H-1,3-thiazin-4-ones and their Facile Recyclization to 2,2'-(1,4-Phenylene)bis(pyrimidin-4-one) and/or 2,2'-(1,4-Phenylene)-bis-(thieno[2,3-d]pyrimidin-4(1H)-one) Derivatives
Autor: Raafat M. Shaker, Fathy F. Abdel-Latif, Yusria R. Ibrahim, Asmaa Hamoda
Publikováno v: Zeitschrift für Naturforschung B. 65:1148-1154
1,3-Thiazines are an important type of heterocycles showing a wide variety of pharmacological properties. Thus, 1,3-thiazine derivatives have recently been reported as cholecystokinin antagonists [1], antimycobacterial agents [2], cannabinoid recepto
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0baef370b7606eb09f90197bb0d19bd0
https://doi.org/10.1515/znb-2010-0915
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