Zobrazeno 1 - 10 of 64 pro vyhledávání: '"N. R. El‐Rayyes"'
1
Heterocycles. IX. Synthesis of new substituted benzo[h]quinolones
Autor: Fatima Al-Omran, N. R. El-Rayyes, M. Edun, Balkis Al-Saleh
Publikováno v: Journal of Heterocyclic Chemistry. 23:1789-1793
2-Arylidine-1-tetralones I were condensed with phenyl-, p-chlorophenyl-, and p-methoxyphenylacetamides A in the presence of a base to yield the corresponding benzo[h]quinolones II-IV. Dehydrogenation of compounds II gave the benzoquinolones V which u
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3e04839ee2ce375299e73f1c390fff55
https://doi.org/10.1002/jhet.5570230638
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3
Heterocycles. PartXVII. Synthesis of new substituted 2,3,3a,4,5,6-hexahydrobenzo[6,7]cyclohepta[1,2-c]pyrazoles and related compounds
Autor: N. H. Bahtiti, N. R. El-Rayyes
Publikováno v: Journal of Heterocyclic Chemistry. 26:209-214
Aryl aldehydes I reacted with 1-benzosuberone to yield the corresponding 2-arylidene-1-benzosuberones II. Condensation of II with hydrazine and its derivatives provided the substituted 2,3,3a,4,5,6-hexahydro-benzo[6,7]cyclohepta[1,2-c]pyrazoles III-V
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1f67daee7bea9beb8a37c06aeea54c64
https://doi.org/10.1002/jhet.5570260137
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4
The stobbe condensation with substituted succinic esters. II A synthesis of benzothiophene derivatives
Autor: N. A. Al-Salman, N. R. El-Rayyes
Publikováno v: Journal of Heterocyclic Chemistry. 13:285-290
The condensation of some thienyl carbonyl compounds with dimethyl phenylsuccinate using either sodium hydride or potassium t-butoxide as condensing agents, gave a stereoisomeric mixture of (E)- and (Z)-half-esters (3). The (E)-half-esters la-c were e
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https://doi.org/10.1002/jhet.5570130217
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5
The STOBBE condensation with substituted succinic esters, part I. A Synthesis of Benzothiophene Derivatives
Autor: N. A. Al-Salman, N. R. El-Rayyes
Publikováno v: Journal f�r Praktische Chemie. 317:552-560
The condensation of some thienyl carbonyl compounds with dimethyl methylsuccinate in presence of potassium t-butoxide or sodium hydride gave predominantly the (E)-half-esters11a–d, which were cyclised to benzothiophene derivatives 2a–d. The (E)-d
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0d263ae690ed839e25cb1587b553a878
https://doi.org/10.1002/prac.19753170406
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6
Acetylenic ketones. Part VI. Reaction of aroylphenylacetylenes with hydrazine derivatives
Autor: F. H. Al-Hajjar, F. G. Baddar, N. R. El-Rayyes
Publikováno v: Journal of Heterocyclic Chemistry. 15:385-393
The reaction of aroylphenylacetylenes (I) with acyl- or aroylhydrazines (II) gave ω-aroyl-acetophenone-N-acyl or N-aroylhydrazones (IV). The latter gave upon treatment with methanolic potassium hydroxide and with acetic anhydride in the presence of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e5f7cce93db28e06eebec7ebe68b89f4
https://doi.org/10.1002/jhet.5570150306
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7
Acetylenic ketones. Part V. Reaction of acetylenic ketones with thiourea and some of its derivatives
Autor: N. R. El-Rayyes, F. G. Baddar, F. H. Al-Hajjar
Publikováno v: Journal of Heterocyclic Chemistry. 15:105-112
Aroylphenylacetylenes (I) reacted with thiourea and S-benzylisothiourea to give 4,6-diaryl-pyrimidine-2(1H)thiones (IV) and α-aroyl-β-benzylmercaptostyrenes (X), respectively. Methyla-tion and acetylation of the thiones (IV) gave the corresponding
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::77892b70c358bc86f57878cd68b8afc5
https://doi.org/10.1002/jhet.5570150122
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8
Heterocycles. PartX. Synthesis of new pyrimidine systems
Autor: H. M. Ramadan, N. R. El-Rayyes
Publikováno v: Journal of Heterocyclic Chemistry. 24:589-596
Selected aryl aldehydes I were reacted with 1-benzosuberone to give the corresponding 2-arylidene-1-ben-zosuberones II. Condensation of these chalcones with urea and thiourea revealed the formation of the corresponding substituted pyrimidin-2-ones II
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https://doi.org/10.1002/jhet.5570240310
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9
Reactions of Dimethyl-2,5-dihydroxy-3,6-dihydroterephthalate with Nucleophilic Nitrogen Compounds
Autor: F. H. Al-Hajjar, N. R. El‐Rayyes
Publikováno v: Journal f�r Praktische Chemie. 320:991-998
Reaktionen von Dimethyl-2,5-dihydroxy-3,6-dihydroterephthalat mit nucleophilen Stickstoffverbindungen Dimethyl-2,5-dihydroxy-3,6-dihydroterephthalat 1 wird durch basenkatalysierte Kondensation von Dimethylsuccinat dargestellt. Reaktionen von 1 mit ei
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a1e4c428ec943b2f368db0a891ae78e6
https://doi.org/10.1002/prac.19783200614
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10
The stobbe condensation with dimethyl homophthalate. II
Autor: A. H. A. Ali, N. R. El-Rayyes
Publikováno v: Journal of Heterocyclic Chemistry. 13:83-88
The condensation of some heterocyclic aldehydes with dimethyl homophthalate in the presence of either sodium hydride or potassium t-butoxide as condensing agents gave either the (E)-or the (Z)-half-ester (1b) as the predominant product. The structure
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https://doi.org/10.1002/jhet.5570130115
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