کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
58443 | 47152 | 2007 | 5 صفحه PDF | دانلود رایگان |
With respect to economical and ecological considerations, molecular oxygen is the oxidant of choice for functionalization of organic substrates. On the basis of our cerium-catalyzed α-hydroxylation of β-dicarbonyl compounds, we have developed an oxidative process for C–C bond formation in the presence of simple olefins like styrene. Products of these reactions, which are isolated as endoperoxidic 1,2-dioxane derivatives with potential anti-malaria activity, are hydroperoxides. These peroxides are disproportionated to 1,4-dicarbonyl compounds in a Kornblum–DeLaMare fragmentation. Actually, β-dicarbonyl compounds can be directly converted in a two-step one-pot procedure to give the 1,4-diketones in high yield. Compounds with 1,4-dicarbonyl structural motif are important intermediates for the synthesis of heterocyclic compounds and commonly only accessible by an Umpolung strategy.
Journal: Catalysis Today - Volume 121, Issues 1–2, 15 March 2007, Pages 22–26