Výsledky vyhledávání - "M. A. M. Nassr"

New Synthesis of Monomeric and Polymeric Saccharide bis-Hydrazide Diamines Salts. Reaction of 2, 3, 4, 5-Tetra-O-acetyl Galactaric Acid bis-Hydrazides with Different Diamines

Autor: Tarek M. Abass, M. A. M. Nassr, Elsayed Mansour, Ahmed A. Kassem, Ahmed El-Toukhy

Publikováno v: Journal of Carbohydrate Chemistry. 11:305-318

Reaction of 1-(2,3,4,5-tetra-o-acetylgalactaroy1)bis-2-[thiomethyl or thiobenzy1(thiocarbony1)]hydrazine 1 or 2 with different bifunctional amines [piperazine (PPZ), tetraethyl-ethylenediamine (TEED), tetramethylethylenediamine (TMED), and tetramethy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9389e96302002e35e24f61f622265ce2
https://doi.org/10.1080/07328309208017995

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Selective cyclisation of 2, 3, 4, 5-tetra-O-acetyl-galactaric acid bis-[Alkylthio(thiocarbonyl)]hydrazide to Saccharide 1, 3, 4-Oxadiazole, Thiadiazole, and thiadiazoline derivatives

Autor: Ahmed El-Toukhy, Tarek M. Abass, M. A. M. Nassr, Ahmed A. Kassem, Elsayed Mansour

Publikováno v: Journal f�r Praktische Chemie. 333:339-344

The syntheses of galactaric acid acetate bis[alkylthio-(thiocarbonyl)]hydrazides (1,2) are described. Selective cyclisation of both hydrazide 1 and 2 was investigated. Using phosphorous oxychloride as a cyclising agent, loss of water produced 1,2,3,4

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c0634aa0bdaeb7b550303879ec0d62be
https://doi.org/10.1002/prac.19913330221

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Selective Cyclisation of 2,3,4,5-Tetra-O-Acetylgalactaric Acid Bis[Alkylthio(Thiocarbonyl)]Hydrazides to Saccharide 1,3,4-Oxadiazole, Thiadiazole, and Thiadiazoline Derivatives

Autor: Ahmed El-Toukhy, Tarek M. Abass, M. A. M. Nassr, Ahmed A. Kassem, Elsayed Mansour

Publikováno v: Journal of Carbohydrate Chemistry. 10:429-438

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac13d09053e69edb28983b55b76786ae
https://doi.org/10.1080/07328309108543919

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Cyclization of aldonic acid aroylhydrazides to 1,3,4-oxadiazoline derivatives

Autor: Mamdouh A. M. Taha, Mohammed A.E. Shaban, M. A. M. Nassr

Publikováno v: Carbohydrate Research. 121:119-124

d -Glucono-1,5-lactone reacts with aroylhydrazines to give the corresponding 1-aroyl-2- d -gluconylhydrazines. Condensative cyclization of these compounds using triethyl orthoformate gave the corresponding 5-aryl-2-ethoxy-3- d -gluconyl-2,3-dihydro-1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::41cafe58ef04bf22ed999dc7b97a7f18
https://doi.org/10.1016/0008-6215(83)84011-7

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Reactions of Aroylhydrazones, IV: Synthesis of Nitrogen Heterocycles from Opianic Acid Hydrazones

Autor: M. A. M. Nassr, Sousan M. El-Badry, Mohammed A.E. Smaban

Publikováno v: Journal of the Chinese Chemical Society. 32:65-73

Opianic acid reacts with various hydrazines to yield either hydrazone (3, 6) or phthalazinone (4) derivatives depending upon the electronic properties of the substituent attached to the hydrazine molecule. Oxidative cyclization of opianic acid aroylh

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac592d457878652f3bd963a430c060d6
https://doi.org/10.1002/jccs.198500012

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Syntheses of 2-acetamido-2-deoxy-4-O-α-D-glucopyranosyl-α-d-glucopyranose (n-acetylmaltosamine) and 2-acetamido-2-deoxy-4-O-β-d-glucopyranosyl-α-d-glucopyranose

Autor: Pierre Sinaÿ, Jean-Claude Jacquinet, M. A. M. Nassr

Publikováno v: Carbohydrate Research. 77:99-105

Condensation of benzyl 2-acetamido-3,6-di- O -benzyl-2-deoxy-α- D -glucopyranoside with 2,3,4,6-tetra- O -benzyl-1- O -( N -methyl)acetimidoyl-β- D -glucopyranose gave benzyl 2-acetamido-3,6-di- O -benzyl-2-deoxy-4- O -(2,3,4,6-tetra- O -benzyl-α-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::99d6b305a18b6edb9166cb82d13078c7
https://doi.org/10.1016/s0008-6215(00)83796-9

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AcyclicC-Nucleoside Analogs of the Type of 5-C-Polyhydroxyalkyl-1,3,4-thiadiazoles

Autor: Yeldez El Kilany, El-Sayed H. El Ashry, A. Mousaad, M. A. M. Nassr

Publikováno v: Bulletin of the Chemical Society of Japan. 60:3405-3409

The synthesis of some acyclic C-nucleoside analogs possessing thiadiazole rings was achieved by the heterocyclization of the 4-arylthiosemicarbazones of D-galactose, D-glucose, D-mannose, D-arabinose, and lactose, Acetylation of the thiadiazoles affo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dc13f8a7b1987c01903a8c29810a5353
https://doi.org/10.1246/bcsj.60.3405

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