Results 1 to 10 of about 3,510 (179)

Synthetic Anthocyanidins from Natural Benzopyrans [PDF]

open access: yesNatural Product Communications, 2016
A hydride abstraction strategy can be used to make anthocyanidins and isoflavylium salts from benzopyrans in good yields.
Kraus, George, Geraskin, Ivan
openaire   +7 more sources

Recent advances in the structures and bioactivities of benzopyrans derived from marine fungi: a review [PDF]

open access: yesFrontiers in Pharmacology
Marine fungi represent a treasure trove of bioactive secondary metabolites, with benzopyran compounds emerging as a significant class of these natural products.
Yidan Xi   +6 more
doaj   +2 more sources

Revealing Medicinal Constituents of Bistorta vivipara Based on Non-Targeted Metabolomics and 16S rDNA Gene Sequencing Technology [PDF]

open access: yesMolecules
Bistorta vivipara is a medicinal plant with a long history, but there are few studies on the effects of its medicinal components and endophytic bacteria on the accumulation of secondary metabolites.
Hui He   +8 more
doaj   +2 more sources

Synthesis of benzofurans and benzopyrans [PDF]

open access: yes, 2002
Syntheses of 2,3-dihydrobenzofurans and 3,4-dihydrobenzopyrans normally involve several stages, therefore efficient syntheses of these compounds are desirable. A number of 3,4-dihydrobenzopyrans derivatives were prepared in one pot syntheses. The reaction is thought to proceed through cation intermediates, involving allylic cations generated by the ...
Mahmood, Raza
openaire   +4 more sources

Contrasting Photochromic and Acidochromic Behaviors of Pyridyl- and Pyrimidylethynylated Mono- and Bis-Benzopyrans [PDF]

open access: yesACS Omega, 2021
Arindam Mukhopadhyay   +3 more
doaj   +2 more sources

Synthesis of Polycyclic Ether-Benzopyrans and In Vitro Inhibitory Activity against Leishmania tarentolae

open access: yesMolecules, 2020
Construction of a focused library of polycyclic ether-benzopyrans was undertaken in order to discover new therapeutic compounds that affect Leishmania growth and infectivity.
Sarita Singh   +6 more
doaj   +1 more source

Design, Synthesis, and Evaluation of Near-Infrared Fluorescent Molecules Based on 4H-1-Benzopyran Core

open access: yesMolecules, 2021
A series of novel fluorescent 4H-1-benzopyrans was designed and developed as near-infrared fluorescent molecules with a compact donor–acceptor-donor architecture. Spectral intensity of the fluorescent molecules M-1, M-2, M-3 varied significantly with the
Shuting Wang   +6 more
doaj   +1 more source

Photochromism of indolino-benzopyrans studied by NMR and UV-visible spectroscopy

open access: yesInternational Journal of Photoenergy, 2006
The synthesis of photochromic 3,3-di(4′-fluorophenyl)-3H-benzopyrans fused to an indole moiety is described. The structures of photomerocyanines elucidated by NMR spectroscopy and spectrokinetic data (λmax⁡ of colored form, colorability, and rate ...
S. Delbaere   +4 more
doaj   +2 more sources

Solid-Phase Parallel Synthesis of Drug-Like Artificial 2<em>H</em>-Benzopyran Libraries

open access: yesMolecules, 2012
This review covers the construction of drug-like 2<em>H</em>-benzopyrans and related libraries using solid-phase parallel synthesis. In this context, the preparation of substituted benzopyrans such as mono-, di- and trisubstituted benzopyran ...
Young-Dae Gong, Taeho Lee
doaj   +1 more source

Transition-metal-free cross-coupling of indium organometallics with chromene and isochroman acetals mediated by BF3·OEt2 [PDF]

open access: yes, 2016
[Abstract] A transition-metal-free coupling of triorganoindium reagents with benzopyranyl acetals mediated by a Lewis acid has been developed. The reaction of R3In with chromene and isochroman acetals in the presence of BF3·OEt2 afforded 2-substituted ...
Gil-Negrete, José M.   +2 more
core   +2 more sources

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