PIDA‐mediated Oxidative Decarboxylation of Oxamic Acids. The Role of Radical Acidity Enhancement.
作者:Ikechukwu Martin Ogbu、Gülbin Kurtay、Margaux Badufle、Frédéric Robert、Carlos Silva Lopez、Yannick Landais
DOI:10.1002/chem.202202963
日期:2023.3.13
An expedient thermal protocol to decarboxylate oxamic acids is found to have contrasting behaviour with its photochemical alternative. The enhanced radical acidity of a carbamoyl intermediate is shown to be key in the reaction mechanism.
Iron-Catalyzed Oxidative Decarboxylation of Oxamic Acids: A Safe and Efficient Photochemical Route to Urethanes
作者:Yannick Landais、Gülbin Kurtay、Jonathan Lusseau、Frédéric Robert
DOI:10.1055/a-2131-3368
日期:2024.2
This study presents a facile method for synthesizing urethanes through the photocatalyzed oxidative decarboxylation of oxamic acids. The process involves the formation of an isocyanate in situ from an oxamic acid under blue-light irradiation (427 nm) in the presence of ferrocene as a photocatalyst, 2-picolinic acid as a ligand, and potassium bromate as an oxidant. The one-pot procedure effectively avoids