Results 21 to 30 of about 12,444 (248)
On the reduction of 4-oxo-4h-benzopyran-3-carbaldehydes : global and local electrophilicity patterns [PDF]
, 2004 The theoretical global and local electrophilicity patterns of substituted and chelated 4-oxo-4H-benzopyran-3-carbaldehydes (formylchromones) have been evaluated using the electrophilicity index proposed by Parr et al [J. Am. Chem. Soc. 1999, 121, 1922].
Araya Maturana, Ramiro +3 more
core +2 more sources
Reactions of 2-methylchromones with cyanoacetamides and ethyl cyanoacetate. synthesis of 6-(2-hydroxyaryl)-4-methyl-2-oxo-1,2-dihydropyridine-3- carbonitriles and 7-hydroxy-6-imino-9-methyl-6h-benzo[c]chromene-8-carbonitriles [PDF]
, 2013 Although 2-methylchromones react with cyanoacetamide and N-methyl cyanoacetamide in the presence of sodium ethoxide in refluxing ethanol to produce 6-(2-hydroxyaryl)-4-methyl-2-oxo-1,2-dihydropyridine-3-carbonitriles, their reactions with ethyl ...
Al Naimi +23 more
core +4 more sources
Characterization and Determination of 2-(2-Phenylethyl)chromones in Agarwood by GC-MS
Molecules, 2013 Agarwood is the fragrant resinous heartwood obtained from certain trees in the genus Aquilaria belonging to the family Thymelaeaceae. 2-(2-Phenylethyl)chromones and characteristic sesquiterpenes are the main classes of aromatic compounds isolated from ...
Hao-Fu Dai +8 more
doaj +1 more source
Therapeutic potency of substituted chromones as Alzheimer’s drug: Elucidation of acetylcholinesterase inhibitory activity through spectroscopic and molecular modelling investigation [PDF]
BioImpacts, 2019 Introduction: Documentation on the potency of chromones as acetylcholinesterase (AChE) antagonists has paved the way for the design and usage of new chromone analogues as inhibitors of AChE modelled on the hypothesis based on cholinergic pathway of ...
Prayasee Baruah +3 more
doaj +1 more source
Mechanism and Application of Baker–Venkataraman O→C Acyl Migration Reactions [PDF]
, 2014 This literature review focuses on the O→C acyl migration of aryl esters to yield the corresponding 1,3-dicarbonyl products—a reaction known as the Baker–Venkataraman rearrangement—and outlines their subsequent transformations.
Ameen, Dana, Snape, Timothy James
core +1 more source
Synthesis and transformation of halochromones [PDF]
, 2014 Chromones (4H-1-benzopyran-4-ones) are one of the most abundant groups of naturally occurring oxygen containing heterocyclic compounds possessing a benzo-γ-pyrone framework, 1a.
Santos, Clementina M.M. +2 more
core +1 more source
RSC Advances, 2022 In this work, site-selective C–H activation at C-5, C-3 and C-2 positions of chromones for the introduction of structural diversity to the chromone scaffold was studied.
Anjitha Theres Benny +1 more
semanticscholar +1 more source
Jurnal Kedokteran Hewan, 2016 This study was purposed to inquire the activities of benzopyran (chromones) and benzofuranones (coumaranones) derivatives against Steinernema feltiae (S. feltiae). The toxicity assay against S.
Khairan Khairan +3 more
doaj +1 more source
Plants, 2022 The extract, fractions, and compounds of the Bouvardia ternifolia root were evaluated as an antiarthritic using a complete Freund’s adjuvant (CFA) model in mice and NF-κB inhibition in RAW 264.7 macrophages.
Yury Maritza Zapata Lopera +8 more
doaj +1 more source
Marine Drugs, 2022 A mangrove endophytic fungus Phomopsis asparagi DHS-48 was found to be particularly productive with regard to the accumulation of substantial new compounds in our previous study.
Ting Feng +5 more
doaj +1 more source