Results 171 to 180 of about 17,659,431 (225)

The 2-pyrones of Aniba species

Phytochemistry, 1971
Abstract 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, von Bülow, Maria Vittória, Gottlieb, Otto Richard, Pinho, Sonildes Lamêgo Vieira, Rocha, Arnaldo Imbiriba da   +4 more
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PROGRESS IN THE CHEMISTRY OF 2-PYRONES

Russian Chemical Reviews, 1967
CONTENTS I. Introduction 175 II. Methods of synthesis of 2-pyrones 175 III.
N P Shusherina, N D Dmitrieva, Evgenii A Luk'yanets, R Ya Levina   +3 more
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2-Pyrones possessing antimicrobial and cytotoxic activities

Bioorganic & Medicinal Chemistry, 2004
The 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, Lester R, Marrison, Julia M, Dickinson, Feng-Ju, Lu, Jan Peter, Schmidt   +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, 1971
Various 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, 1985
AbstractA 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, Tien L. Huang, Michael A. Stanga, Michael J. Brubaker, Min K. Moi   +4 more
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Asymmetric Hydrogenation of Substituted 2-Pyrones

The Journal of Organic Chemistry, 1999
Various 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, Giambattista Consiglio, Michelangelo Scalone, Rudolf Schmid   +3 more
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Iodination of 6-aryl-2-pyrones

Chemistry of Heterocyclic Compounds, 1984
The iodination of 6-aryl-2-pyrones with iodine chloride in glacial acetic acid leads to the corresponding 3-iodo derivatives. 3-Cyano-6-phenyl-2-pyrone and 3-phenylethynyl-6-phenyl-2-pyrone were obtained by replacement of the iodo group by cyano and phenylethynyl groups.
S. V. Sokolovskaya, L. K. Moldovanova
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One step preparation of bromo-2-pyrones via bromo-decarboxylation of 2-pyrone-carboxylic acids

Tetrahedron Letters, 2001
Abstract Synthetically valuable 3-bromo-2-pyrone, 3-bromocoumarin, 5-bromo-2-pyrone, and 3,5-dibromo-2-pyrone were prepared in one step from readily available 2-pyrone-carboxylic acids via bromo-decarboxylation in good to fair yields.
Cheon-Gyu Cho, Jung-Sang Park, In-Hak Jung, Haiwon Lee   +3 more
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Phenolic derivatives of 2-pyrone. I.

Chemistry of Heterocyclic Compounds, 1971
The condensation of hydroxy- and methoxyacetophenones with 1,1,1,3-tetrachloro-3-ethoxypropane or β, β-dichloroacrolein in an acid medium has yielded a number of dichlorodienyl hydroxyphenyl ketones which are converted into the corresponding 2-pyrones in acetic or propionic acids in the presence of phosphoric acid.
Yu. V. Maevskii, S. V. Sokolovskaya, I. P. Komkov   +2 more
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3-Hydroxy-2-pyrone

2001
[496-64-0] C5H4O3 (MW 112.09) InChI = 1S/C5H4O3/c6-4-2-1-3-8-5(4)7/h1-3,6H InChIKey = LIPRKYKMVQPYPG-UHFFFAOYSA-N ([4 + 2] cycloaddition vinylketene diene equivalent2, 3) Physical Data: white, crystalline solid; mp 92 °C; mp (dihydrate) 80–85 °C; bp 112 °C/20 mmHg; sublimes at 50 °C/4 mmHg; λmax 294 nm (H2O ...
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