Results 151 to 160 of about 39,305 (203)

4-Phenyl-4H-pyrans as IKCa channel blockers

Bioorganic & Medicinal Chemistry Letters, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Klaus, Urbahns, Ervin, Horváth, Johannes Peter, Stasch, Frank, Mauler   +3 more
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Efficient and Convenient Method for the Synthesis of Poly Functionalised 4H‐Pyrans

Synthetic Communications, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
B. P. V. Lingaiah, G. Venkat Reddy, T. Yakaiah, B. Narsaiah, S. N. Reddy, R. Yadla, P. Shanthan Rao   +6 more
openaire   +1 more source

4H-Pyran-4-one derivatives:

2009
A series of 3-hydroxy-6-methyl-2-((4-substitutedpiperazin-1-yl)methyl)-4H-pyran-4-on e structured compounds were synthesized by reacting 5-hydroxy-2-methyl-4H-pyran-4-one with suitable piperazine derivatives using Mannich reaction conditions. Antibacterial activities of the compounds for E. coli, S. paratyphi, S. flexneri, E.
Us, Demet, Gurdal, Ece, Berk, Barkin, Oktem, Sinem, Kocagoz, Tanil, Caglayan, Berrak, Kurnaz, Isil Aksan, Erol, Dilek Demir   +7 more
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ChemInform Abstract: SYNTHETIC APPROACHES TO THE 4H‐PYRAN RING

Chemischer Informationsdienst, 1980
AbstractReview: Verschiedene Synthesen für Verbindungen mit 4H‐Pyran‐Ringen (I) werden diskutiert.
C. SEOANE, J. L. SOTO, M. QUINTEIRO
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A convenient preparation of tetrahydro-4H-pyran-4-one

Journal of the Chemical Society C: Organic, 1970
Tetrahydro-4H-pyran-4-one has been prepared in a two-stage process from 3-chloropropionyl chloride, in 45% overall yield.
G. R. Owen, C. B. Reese
openaire   +1 more source

ChemInform Abstract: METALATION OF DIHYDRO‐4H‐PYRANS DERIVATIVES. PREPARATION OF 2‐ALKYL‐3‐CHLORO‐5,6‐DIHYDRO‐4H‐PYRANS

Chemischer Informationsdienst, 1977
AbstractDas Dihydropyran (Ia) oder sein 3‐Chlorderivat (Ib) werden lithiiert und die entstandenen Verbindungen (II) mit Alkyljodiden zu den Titelverbindungen (III) umgesetzt.
O. RIOBE, A. LEBOUC, J. DELAUNAY
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Photolysis of 2,6-diphenyl-4H-pyran-4-thione

Journal of the Chemical Society D: Chemical Communications, 1970
Photolysis of 2,6-diphenyl-4H-pyran-4-thione in dioxan results in desulphurization to give 2,2′,6,6′-tetraphenyl-4,4′-bi(pyranylidene).
N. Ishibe, M. Odani, K. Teramura
openaire   +1 more source

Synthesis of 4H-pyrans by O-cyclization of 1,5-diketones

Chemistry of Heterocyclic Compounds, 1992
Substituted 4H-pyrans were obtained in high preparative yields by the reaction of 1,5-diketones with acetic anhydride and boron trifluoride etherate in diethyl ether. It is assumed that the heterocyclization of 1,5-diketones includes a step involving the formation and transformations of an acyloxy carbonium ion.
A. F. Blinokhvatov, O. V. Markovtseva, M. N. Nikolaeva   +2 more
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Friedländer reaction on 2-amino-3-cyano-4H-pyrans: Synthesis of derivatives of 4H-pyran [2,3-b] quinoline, new tacrine analogues

Bioorganic & Medicinal Chemistry Letters, 1997
The unprecedented Friedlander reaction of densely functionalized 2-amino-3-cyano-4H-pyrans (1) with cyclohexanone has afforded in one step and good yield 5-amino-4-aryl-3-ethoxycarbonyl-2-methyl-6,7,8,9-tetrahydro-4H-pyran[2,3-b]quinolines (2), novel amino-substituted fused pyran derivatives. These compounds are new tacrine analogues.
Angeles Martínez-Grau, JoséL Marco
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Theoretic and Experimental Study of Photoprocesses in Substituted 4-Dicyanomethylene-4H-pyrans

High Energy Chemistry, 2005
The photoprocesses in substituted 4-dicyanomethylene-4H-pyran (DCM) derivatives were studied theoretically and experimentally. The experimental spectral and luminescent parameters of the molecules under study are in good agreement with the results of quantum-chemical calculations.
Pomogaev, Vladimir A., Svetlichnyi, Valerii A., Pomogaeva, A. V., Svetlichnaya, N. N., Kopylova, Tatyana N.   +4 more
openaire   +2 more sources