Urethanes synthesis from oxamic acids under electrochemical conditions
作者:Ikechukwu Martin Ogbu、Jonathan Lusseau、Gülbin Kurtay、Frédéric Robert、Yannick Landais
DOI:10.1039/d0cc05069e
日期:——
Urethanesynthesis via oxidative decarboxylation of oxamic acids under mild electrochemical conditions is reported. This simple phosgene-free route to urethanes involves an in situ generation of isocyanates by anodic oxidation of oxamic acids in an alcoholic medium. The reaction is applicable to a wide range of oxamic acids, including chiral ones, and alcohols furnishing the desired urethanes in a
based on a photocatalyzed oxidative decarboxylation of oxamic acids is described. The reaction includes in situ generation of an isocyanate from the oxamic acid, using an organic dye as a photocatalyst, a hypervalent iodine reagent as an oxidant and a light source, which trigger the free-radical decarboxylation. This protocol successfully avoids the isolation, purification and storage of carcinogenic
Photocatalyzed decarboxylation of oxamic acids under near-infrared conditions
作者:Ikechukwu Martin Ogbu、Dario M. Bassani、Frédéric Robert、Yannick Landais
DOI:10.1039/d2cc03155h
日期:——
Photocatalyzed oxidative decarboxylation of oxamic acids under near-infrared irradiation using Os(bptpy)2(PF6)2 as catalyst is reported. The reaction was applied to the synthesis of urethanes and heterocyclic amides. Mechanistic studies and comparative penetration depths between the NIR and the visiblelight mediated processes are discussed.