WebJul 22, 2016 · Four new dihydroxanthone derivatives (1-4), four new tetrahydroxanthone derivatives (5-8), two new xanthone derivatives (9 and 10), and two known caged … WebApr 19, 2024 · The [4+2] cycloaddition of chromone-fused dienes with enamines was found to be an efficient method for the synthesis of 4,4a- and 3,4-dihydroxanthone derivatives. Either product type could be obtained by choosing the proper conditions [reaction time and addition of La(NO 3) 3 as a Lewis acid]. Calculations using density functional theory and ...
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4,4a-Dihydroxanthone C13H10O2 CID 142770931 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. WebAug 1, 2009 · On bioassay, a dihydroxanthone, nidulalin A (1), a hexaketide, sordarial (5), and a xanthone, pinselin (7) have displayed significant immunosuppressive activities. … g1-a-15ha
The first total synthesis of nidulalin A, a dihydroxanthone
WebJun 22, 2016 · Four new dihydroxanthone derivatives (1–4), four new tetrahydroxanthone derivatives (5–8), two new xanthone derivatives (9 and 10), and two known caged tetrahydroxanthones were isolated from extracts of the leaves of Garcinia oligantha by bioassay-guided fractionation. These structures of the new compounds were elucidated … WebApr 5, 1999 · A general approach to synthesis of dihydroxanthone derivatives is described here. In vitro evaluation of these dihydroxanthones demonstrated that some derivatives possess moderate anti-cholinesterase activities and better selectivities than tacrine for acetylcholinesterase over butyrylcholinesterase. Structural effects on anti … WebThe infrared (IR) spectra of these types of compounds present intense bands between 1630 and 1700 cm − 1, characteristic of the chelated carbonyl group of … attorney okansilli