3261-08-3Relevant articles and documents
One-pot Synthesis of Aurones through Oxidation-cyclization Tandem Reaction Catalyzed by Copper Nanoparticles Catalyst
Yu, Min,Liu, Guangxiang,Han, Chengyan,Zhu, Li,Yao, Xiaoquan
, p. 70 - 77 (2018/03/05)
Aurones were synthesized through an oxidation-cyclization tandem reaction of 2-(1- hydroxyprop-2-ynyl)phenols catalyzed by copper nanoparticles (Cu NPs) with bipyridine as the ligand. In the reaction, oxygen worked as a green and mild oxidant to give the best results. Cu NPs were dually activated by bipyridine ligand and water, and showed highly efficient catalytic activities to the oxygen oxidation and the cylization to give aurones and flavonoids.
An efficient synthesis of aurone derivatives by the tributylphosphine-catalyzed regioselective cyclization of o-alkynoylphenols
Saito, Koya,Yoshida, Masahito,Doi, Takayuki
supporting information, p. 141 - 143 (2015/02/19)
An organocatalytic regioselective synthes is of aurones from o-alkynoylphenols was achieved. A catalytic amount of tributylphosphine select ively induced the 5-exo cyclization of o-alkynoylphenols under ambient conditions leading to aurone derivatives in high to excellent yields.
FLAVONE FORMATION IN THE WHEELER AURONE SYNTHESIS
Donnelly, John A.,Higginbotham, Clement L.
, p. 7219 - 7226 (2007/10/02)
Dihydrochalcones, formed by bromomethylation of the side-chain of 2'-acetoxychalcones, were found to produce minor quantities of flavones as well as the major product, aurones, when cyclized by aqueous ethanolic sodium hydroxide.The yields of flavone increased with increasing base concentration.The optimum concentration of hydroxide for aurone formation was below 1percent.Greatly diminished yields of O-heterocycles were obtained when a nitro substituent was introduced para to the cyclizing 2'-oxy function.