Results 101 to 110 of about 9,191 (227)

8-Methoxy-3-(4-methylbenzylidene)-6-(prop-1-enyl)chroman-4-one

Acta Crystallographica Section E, 2008
In the title compound, C21H20O3, the tolyl ring makes a dihedral angle of 31.11 (6)° with the benzene ring of the chromanone unit. The pyrone ring adopts a half-chair conformation. The molecular structure is stabilized by a weak intramolecular
R. Suresh, Charles C. Kanakam, V. Manivannan, Chandhra Sekhar Vasam, A. Marx   +4 more
doaj   +1 more source

Catalytic Asymmetric Diels-alder Reactions of 2-pyrone Derivatives

, 1994
Cycloaddition reactions between the chiral 2-pyrone derivatives 9 and various dienophiles, catalysed by lanthanide shift reagents, afforded diastereomerically pure bicyclic lactones 3.
Evans, GR., István E Markó, Declercq, Jean-Paul, Jean-Paul Declercq, Marko, Istvan, Graham R Evans   +5 more
core   +1 more source

THE MOLECULAR ZEEMAN EFFECT IN 2-CYCLOPENTANE-1-ONE, 2-PYRONE, AND 4-PYRONE

, 1971
Author Institution: Noyes Chemical Laboratory, University of IllinoisThe molecular Zeeman effect in several similar ring compounds has been studied. In 2-cyclopentene-1-one this yielded the Zeeman parameters of $g_{aa} = -0.088\pm 0.002, {g}_{bb} = -0 ...
Benson, R. C., Norris, C. L., Beak, P. A., Flygare, W. H.   +3 more
core  

Penichrypyrone A: A New γ-Pyrone Derivative from the Sponge-Derived Fungus LS18

Natural Product Communications, 2019
A new γ -pyrone derivative, penichrypyrone A ( 1 ), along with 4 known compounds, conichaetone E ( 2 ), janthinone ( 3 ), mrlactonel ( 4 ), and aspergillusene A ( 5 ), was isolated from the EtOAc extract of the sponge-derived fungus Penicillium ...
Xiaoping He, Lu Ren, Lijian Ding, Jianzhou Xu, Bin Zhang, Weiyan Zhang, Shan He   +6 more
doaj   +1 more source

Formal synthesis of natural 1, 3-polyol/α-pyrone diastereoisomers

, 2008
A stereoselective formal synthesis of diastereoisomers of 1,3-polyol/α-pyrone antifungal natural products isolated from Ravensara anisata has been achieved involving epoxide opening and asymmetric allylation as key ...
Gopal, Peddabuddi, Sabitha, Gowravaram, Yadav, Jhillu S.   +2 more
core   +1 more source

Aloenin B, a New Diglucosylated 6-Phenyl-2-pyrone from Kenya Aloe

, 1986
A new 6-phenyl-2-pyrone O,O-diglucoside, aloenin B, was isolated from commercial Kenya aloe. Its structure, 6- {2-O-β-D-[2-O-(E)-p-coumaroyl} glucopyranosyl-4-O-β-D-giucopyranosyl-6-methyl } phenyl-2-pyrone (1), was established by spectral methods and ...
L. LUNAZZI, P. GRAMATICA, P. MANITTO, G. SPERANZA, G. DADA   +4 more
core   +1 more source

Photoinduced transformation of matrix-isolated methyl 2-pyrone-3-carboxylate into methyl 2-pyrone-5-carboxylate via intramolecular hydrogen shift in open-ring aldehyde–ketene

, 2008
Photochemical transformations of methyl 2-pyrone-3-carboxylate (mp3c) were studied by matrix-isolation technique. The dominating primary photoreaction induced by UV (λ > 295 nm) light was α-bond cleavage leading to open-ring aldehyde–ketene.
Lapinski, Leszek, Reva, Igor, Nowak, Maciej J., Fausto, Rui   +3 more
core   +1 more source

Three pyrone glucosidic derivatives from Conyza albida

, 2002
Three new pyrone glucosidic derivatives, together with the known pyromeconic acid glucoside, three acytelenes and two eudesmanes, were obtained from the aerial parts of Conyza albida.
Mohamed, A.E.-H.H., Hassan, M.E., Ahmed, A.A., Gani, A., Yannitsaros, A., El-Maghraby, M.A., Tzakou, O., Zeller, K.-P.   +7 more
core  

Pyrone Biomonitored Synthesis

Journal of the Mexican Chemical Society
Abstract. Here we report the first biomonitored synthesis of pyrones in the search for molecules with antimicrobial action against pathogenic bacteria and fungi. Pyrones were synthesized from methyl acetoacetate pyrone rings followed by deacetylation, methylation, and aldol condensation reactions to obtain styrylpyrones with yields between 39 and 93 %.
Clécio Souza Ramos, Marcílio Wagner Fontes Silva   +1 more
openaire   +1 more source

Asymmetric Synthesis of the C3α Fragment of 5,6-Dihydro-α-pyrone Nonpeptidic HIV-1 Protease Inhibitors

, 2016
Asymmetric Synthesis of the C3α Fragment of 5,6-Dihydro-α-pyrone Nonpeptidic HIV-1 Protease ...
Arthur G. Romero (3037959), Peter R. Manninen (1451179), Donna L. Romero (1649728), Fusen Han (2690296)   +3 more
core   +1 more source