Copper(II)-catalysed oxidation of quercetin and 3-hydroxyflavone
作者:Masanori Utaka、Akira Takeda
DOI:10.1039/c39850001824
日期:——
Quercetin and 3-hydroxyflavone are oxidized to the corresponding 2-alkoxyflavan-3,4-diones by CuCl2 catalysis in MeOH or EtOH under oxygen or nitrogen, the mechanism of which is proposed.
Condensation reactions of dialkoxy-2-phenylchroman-4-ones with 1,2-diamines: A method for the preparation of chromenoquinoxalines
作者:Hannah Watkins、Gerald Lee、Pangbewindin H.B. Ouedraogo、Clifford W. Padgett、Khoa Nguyen、Rylan Artis、Brandon P. Quillian
DOI:10.1016/j.tetlet.2023.154820
日期:2023.11
rearranging upon heating to form a reactive dione intermediate that subsequently reacts with phenylenediamine derivatives to produce the title compounds. Reactions of 1 and 2 with asymmetric phenylenediamines led to mixtures of two regioisomers, for which the major products were dictated by the relative reactivity of the nucleophilic amine and the electrophilic carbonyl groups. The chromenoquinoxaline products