Mild Oxidation of Diarylacetylenes to 1,2-Diketones Using Oxone in Trifluoroacetic Acid
作者:Ming-Jung Wu、Jean-Ho Chu、Yen-Ju Chen
DOI:10.1055/s-0029-1216800
日期:2009.7
A variety of 1,2-diaryldiketones were synthesized in 15-90% yields by treatment of diarylacetylenes with Oxone as the oxidant in trifluoroacetic acid. Oxidation of 1-nitro-2-(phenylethynyl)benzene and 2,4′-(ethyne-1,2-diyl)bis(nitrobenzene) furnished 1-benzoylbenzo[c]isoxazol-3(1H)-one and benzo[c]isoxazol-3-yl(4-nitrophenyl)methanone as the major products, respectively.
This paper reports the oxidation of functionalized diarylalkynes with DMSO in the presence of the environmentally friendly FeBr3 catalyst. This non-toxic procedure is general and has been applied successfully under microwave irradiation leading rapidly to benzil derivatives in good yields.
The ruthenium-catalyzedsynthesis of 1,2-diketones through the oxidation of alkynes by using sodium hypochlorite has been investigated. RuO4 was generated in situ from inexpensive RuCl3·xH2O, and NaOCl as the oxidant demonstrated high performance at room temperature in the solvent diethyl carbonate. A variety of diketones were prepared in good yields by using this environmentally friendly procedure