Results 121 to 130 of about 2,638 (179)
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ChemInform Abstract: SYNTHESIS OF 5,6‐DIHYDRO‐2‐PYRONE AND 2‐PYRONE
Chemischer Informationsdienst, 1974AbstractVinylessigsäure (I) reagiert mit Formaldehyd (II) in siedendem Eisessig ′in Gegenwart von konz. Schwefelsäure in bescheidenen Ausbeuten zum 5;6‐Dihydro‐2‐pyron (III), das nach Bromierung mit n‐Bromsuccinimid (V) in Tetrachlorkohlenstoff zu (VI) und Dehydrobromierung mit Triäthylamin 2‐Pyron (VII) ergibt.
M. NAKAGAWA +4 more
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Phenyl derivatives of 2-pyrone
Chemistry of Heterocyclic Compounds, 1971Several phenyl dichloropentadienyl ketones containing a hydroxy or methoxy group in the benzene ring as well as a number of 2-pyrones based on them were synthesized. The possibility of the conversion of the latter to the corresponding 2-pyridones on heating them with ammonium salts is demonstrated.
Yu. V. Maevskii, S. V. Sokolovskaya
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A Concise Access to 3-Substituted 2-Pyrones.
The Journal of Organic Chemistry, 2010The development of a modular synthesis of 3-substituted-2-pyrones is described. The attainment of this strategy hinges on a new electrophilic pyrone derivative which can be readily prepared on a multigram scale and which performs very competently in metal-catalyzed cross-coupling reactions with a variety of nucleophiles.
Frébault, F. +3 more
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Preparation of 2-pyrone-5- and 2-pyrone-6-carboxylic acid through ?, ?-dichloroacrolein
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1962We have carried out the synthesis of 2-pyrone-5- and 2-pyrone-6-carboxylic acids usingβ,β-dichloro-acrolein.
L. I. Zakharkin, L. P. Sorokina
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The 2-pyrones of Aniba species
Phytochemistry, 1971Abstract A re-examination of the trunk wood of Aniba parviflora (Meissn.) Mez (Lauraceae) yielded two new constituents, 6-(4′-hydroxy- trans -styryl)-2-pyrone (IVf) and 6-(3′,4′-dihydroxy- trans -styryl-2-pyrone (IVe). 6- Cis -styryl-2-pyrone (Va) was also isolated.
Rezende, C. M. Andrade da Mata +4 more
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PROGRESS IN THE CHEMISTRY OF 2-PYRONES
Russian Chemical Reviews, 1967CONTENTS I. Introduction 175 II. Methods of synthesis of 2-pyrones 175 III.
N P Shusherina +3 more
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2-Pyrones possessing antimicrobial and cytotoxic activities
Bioorganic & Medicinal Chemistry, 2004The 2-pyrone sub-unit is found in a number of natural products possessing broad spectrum biological activity. Such compounds are validated as being capable of binding to specific protein domains and able to exert a remarkable range of biological effects.
Ian J S, Fairlamb +4 more
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Pyridine-2-thiones, 2-pyrone phenylhydrazones, and 2-pyridones from 2-pyrones
Journal of the Chemical Society C: Organic, 1971Various 5-aryloxypyran-2-thiones, 2-pyridones, and 1-amino-2-pyridones have been prepared. The pyran-2-thiones were converted into pyridine-2-thiones and phenylhydrazones. Some derivatives of 6-p-bromophenyl-5-phenoxy-4-phenyl-2-pyrone (Ia) are described.
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Substituted 2‐Pyrones and 5,6‐Dihydropyrones
Journal of Heterocyclic Chemistry, 1985AbstractA series of substituted 2‐pyrones and 5,6‐dihydropyrones have been synthesized and investigated for their inhibitory activity toward human leukocyte elastase, procine pancreatic elastase and chymotrypsin.
William C. Groutas +4 more
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Asymmetric Hydrogenation of Substituted 2-Pyrones
The Journal of Organic Chemistry, 1999Various substituted 2-pyrones have been hydrogenated with high enantioselectivity (up to 97% ee) to the corresponding 5,6-dihydropyrones using cationic ruthenium catalysts containing the (6,6‘-dimethoxybiphenyl-2,2‘diyl)bis[3,5-di(tert-butyl)phenylphosphine] ligand. When substituents at position 3 are absent, 5,6-dihydropyrones are further hydrogenated
Matthias J. Fehr +3 more
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