Results 21 to 30 of about 14,631 (192)
PRENYLATED XANTHONES FROM Rheedia acuminata [PDF]
Acta Amazonica, 1993 Pyranojacareubin; 1,5-dihydroxy-6',6'-dimethyl-2H-pyran(2',3':6,7) -6",6"-dim-ethyI-2H,4H-pyran(2",3":2,3)xanthone and a new xanthone l,6-dihydroxy-5-methoxy-6',6'-dim-ethyl-2H-pyran(2',3':3,2)-7-(3,3-dimethylprop-2-enyl)xanthone were isolated from the ...
Maria das G. B ZOGHBI +3 more
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An overview of structure-based activity outcomes of pyran derivatives against Alzheimer’s disease
Saudi Pharmaceutical Journal, 2023 Pyran is a heterocyclic group containing oxygen that possesses a variety of pharmacological effects. Pyran is also one of the most prevalent structural subunits in natural products, such as xanthones, coumarins, flavonoids, benzopyrans, etc. Additionally
Faisal A. Almalki
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Acta Chimica Slovenica, 2018 The reaction of anthranilic acid with ethoxycarbonylisothiocyanate gave the ethyl 4-oxo-2-thioxo-1,2-dihydroquinazoline-3(4H)-carboxylate (4). The reaction of compound 4 with hydrazine hydrate and a-halocarbonyl derivatives was found to give either ...
Rafat M. Mohareb, Peter A. Halim
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Synthesis of Pyran and Pyranone Natural Products [PDF]
Molecules, 2004 An overview of the synthesis of the fungal metabolites (+)-dermolactone, (–)- semixanthomegnin, (+)- and (–)-mellein, (–)-ochratoxin α, (–)-(1R,3S)-thysanone, the enantiopure ventiloquinones L, E and G, and 8-desmethyleleutherin from a common chiral intermediate, is presented. Further methodology leading potentially toward extended quinones such as (3S,
Christopher D. Donner +2 more
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Acta Crystallographica Section E: Crystallographic Communications, 2019 The title compound, C35H27ClN4O3, crystallized with two independent molecules (A and B) in the asymmetric unit. In both molecules, the pyran and pyridine rings adopt envelope and chair conformations, respectively.
S. Syed Abuthahir +4 more
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Green Chemistry Letters and Reviews, 2019 A simple, efficient, eco-friendly and catalyst-free procedure was developed for the construction of novel coumarin-spiro[indoline-3,4'-pyran] conjugates via three-component reactions of various synthetic beta-ketoesters with isatins and malononitrile in ...
Adil Omar, Keyume Ablajan
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Effects of Pyran-Ring Structure in Carbon Sources on the Electrochemical Performance of LiFePO4/C
International Journal of Electrochemical Science, 2013 Nano-sized LiFePO4/C (LFP/C) with excellent electrochemical performance was prepared by using carbon precursors with different pyran-ring structures as carbon sources.
Baohua Li +9 more
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PRENYLATED XANTHONES FROM Rheedia acuminata (reprinted from Acta Amazônica, 23(2/3):181-185) [PDF]
Acta Amazonica, 1994 Pyranojacareubin; 1,5-dihydroxy-6',6'-dimethyl-2H-pyran(2,,3':6,7) -6",6"-dime-thyl-2H,4H-pyran(2",3":2,3)xanthone and a new xanthone l,6-dihydroxy-5-methoxy-6',6'-dime-thyl-2H-pyran(2',3':3,2)-7-(3,3-dimethylprop-2-enyl)xanthone were isolated from the ...
Maria das G. B. ZOGHBI +3 more
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Novel One-Pot Synthesis of Pyrazolopyranopyrimidinones Using Newly Produced γ-Alumina Nanoparticles as Powerful Catalyst [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2018 g-Alumina nanoparticles (g-Al2O3 NPs) were prepared via a new and simple synthetic route and characterized by field emission scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy.
Sajad Kiani +4 more
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Molecules, 2015 In this work, 3-bromoacetylcoumarin was used as the key starting material for the synthesis of pyran, pyridine, thiophene, thiazole and pyrazole derivatives through its reaction with different reagents.
Rafat M. Mohareb, Nadia Y. MegallyAbdo
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