Direct and Co-catalytic Oxidation of Hydroxylamines to Nitrones Promoted by Rhodium Nanoparticles Supported on Carbon Nanotubes
作者:Praveen Prakash、Edmond Gravel、Dinh-Vu Nguyen、Irishi N. N. Namboothiri、Eric Doris
DOI:10.1002/cctc.201601155
日期:2017.6.22
aerobic oxidation of hydroxylamines to nitrones. Two catalytic systems were developed (i.e., direct or co-catalytic) and both operated to provide high yields of the products, under mild conditions, but with their own specificity as regards the kinetics and regioselectivity of the transformation. In addition, the in situ cycloaddition of the produced nitrones with different alkynes was investigated
Synthesis and new rearrangements of 4-isoxazolin-4,5-dicarboxylic acid derivatives
作者:Necdet Coşkun、Aylin Öztürk
DOI:10.1016/j.tet.2006.09.074
日期:2006.12
Acyclic nitrones react with dimethyl acetylenedicarboxylate (DMAD) to give stable isoxazolines, from which the ones that contain electron-donating aromatic rings at the C3 position (R1) were shown to undergo unprecedented fragmentation at room temperature, giving the R1-aldehyde and inseparable product mixtures, probably due to the formation of highly reactive species such as iminocarbenes. Attempts