Results 151 to 160 of about 433,597 (216)
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Reaction of 2,3,5,10b-tetrahydrooxazolo[3,2-c][1,3]benzoxazines with chlorotrimethylsilane
Russian Journal of Organic Chemistry, 2006AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
B. F. Kukharev +4 more
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ChemInform Abstract: DIE SYNTHESE VON 4H‐1,3‐BENZOXAZIN‐4‐ONIUMSALZEN UND 4H‐1,3‐BENZOXAZIN‐4‐ONEN
Chemischer Informationsdienst, 1975AbstractSalicylamid (I) reagiert mit den Carbonsäureanhydriden (II) in Gegenwart von Perchlorsäure über die Zwischenstufe (III) zu den Benzoxazinoniumsalzen (IV), die bei Behandlung mit tertiären Basen in die Benzoxazinone (V) übergehen und aus ihnen auch mit Perchlorsäure wieder entstehen.
YU. I. RYABUKHIN +2 more
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Insight into the Mechanism of Reversible Ring-Opening of 1,3-Benzoxazine with Thiols
The Journal of Organic Chemistry, 2017The reversible ring-opening addition and fragmentation reaction of p-cresol-based N-phenylbenzoxazine with aliphatic and aromatic thiols was investigated in solvent-mediated and solvent-free reactions. Independently of the used thiol, N-phenylbenzoxazine and the thiols reacted to equilibrium with comparable amounts of reactants and products in aprotic ...
Tobias Urbaniak +3 more
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Organic Letters, 2019
A one-pot method for joining three separate components leading to an assortment of N-substituted 3,4-dihydro-2H-1,3-benzoxazines is described. The method involves the addition of a Grignard reagent to an o-OBoc salicylaldehyde in the presence of an imine.
Peishan Chen +3 more
semanticscholar +1 more source
A one-pot method for joining three separate components leading to an assortment of N-substituted 3,4-dihydro-2H-1,3-benzoxazines is described. The method involves the addition of a Grignard reagent to an o-OBoc salicylaldehyde in the presence of an imine.
Peishan Chen +3 more
semanticscholar +1 more source
Synthesis of 1,2,4-triazolo[5,1-b][1,3]benzoxazines
Chemistry of Heterocyclic Compounds, 2010Alkylation of 1H-azoles by salicyl alcohol to give 2-(1H-azolylmethyl)phenols has been studied in some detail [1-3]. In the presence of good leaving groups in the azole molecules a subsequent cyclization of the initially formed alkylation products can occur to give azolo[1,3]benzoxazines [4]. We propose a simple, one-stage method for the preparation of
V. A. Osyanin +2 more
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Chemischer Informationsdienst, 1982
AbstractDie Umsetzung des Chlorbenzoxazins (I) mit den o‐Aminophenolen (IIa), den o‐Phenylendiaminen (IIb) bzw. dem o‐Aminothiophenol (IIc) führt zu den 2‐Hydroxyphenyl‐ substituierten Azolen (III).
R. TACHIKAWA, K. WACHI, A. TERADA
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AbstractDie Umsetzung des Chlorbenzoxazins (I) mit den o‐Aminophenolen (IIa), den o‐Phenylendiaminen (IIb) bzw. dem o‐Aminothiophenol (IIc) führt zu den 2‐Hydroxyphenyl‐ substituierten Azolen (III).
R. TACHIKAWA, K. WACHI, A. TERADA
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Synthesis of substituted salicylamines and dihydro-2H-1,3-benzoxazines
Tetrahedron, 2007Abstract Phenols were converted to their magnesium salts with the MgCl 2 –Et 3 N base system and subsequently reacted with Eschenmoser's salt, affording N , N -dimethyl substituted benzylamines in high to excellent yields. A series of mono N -substituted benzylamines were prepared in one-pot syntheses by ortho -formylation of phenols to ...
Hany F. Anwar +2 more
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Synthesis of New 1,3‐Benzoxazines from Ketimines and Their Bioevaluation
Journal of Heterocyclic Chemistry, 2015A new series of 1,3‐Benzoxazines were synthesized from ketimines and triphosgene. The synthesized compounds were characterized by IR, 1HNMR, and mass spectral data. The synthesized compounds on bioevaluation indicated significant antifungal activity.
Vikas V. Borgaonkar, Bhagwan R. Patil
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A Novel Three-Component Reaction for the Synthesis of 1,3-Benzoxazines in Water
Combinatorial Chemistry & High Throughput Screening, 2013A simple and proficient method for the synthesis of 1,3-benzoxazine derivatives via three-component reaction of isocyanide and isoquinoline with 1-(6-hydroxy-2-isopropenyl-1-benzofuran-yl)-1-ethanone or 4-hydroxycumarine in water in the presence of piperidine at 70°C is reported.
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Synthesis of novel heterocyclic system-imidazo[5,1-b][1,3]benzoxazine
Chemistry of Heterocyclic Compounds, 2006AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
V. A. Osyanin, N. E. Sidorina
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