An efficient palladium-catalyzed synthesis of benzils from aryl bromides: vinylene carbonate as a synthetic equivalent of glyoxal
作者:Ko Hoon Kim、Bo Ram Park、Jin Woo Lim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2011.04.108
日期:2011.7
An expedient synthetic procedure of benzil derivatives fromarylbromides was developed using vinylene carbonate as a glyoxal equivalent in a palladium-catalyzed reaction. The reaction involved a sequential diarylation of vinylene carbonate to form 4,5-diaryl-1,3-dioxol-2-one, ring-opening to benzoin derivative, and an oxidation process.
reductive coupling reaction was established for the synthesis of diaryl 1,2-dicarbonyl compounds from arylmethyl ketones in good yields. The mechanisticstudy showed the reaction undergoes C(CO)–C(sp3) bond cleavage, with the reductive coupling reaction occurring through an electron transfer process. Notably, the reaction not only is simple to operate but also has mild reaction conditions and a wide