Aerobic Oxidation Approaches to Indole-3-carboxylates: A Tandem Cross Coupling of Amines–Intramolecular Mannich–Oxidation Sequence
作者:Kyeongha Kim、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.9b02348
日期:2019.9.6
A tandem aerobic oxidation protocol has been developed for the facile synthesis of indole-3-carboxylates. Two readily available starting materials, anilines and benzyl-amines, were efficiently cross-coupled under the o-naphthoquinone-catalyzed aerobic oxidation conditions to the corresponding 2-arylmethyleneaminophenylacetates that in turn smoothly underwent the Cu(II)-catalyzed intramolecular Mannich reaction. The resulting indoline derivatives were aerobically oxidized to indole-3-carboxylates, providing a ready access to indole derivatives from two simple amine derivatives.