Cu-Catalyzed Oxidative C(sp2)–H Cycloetherification of o-Arylphenols for the Preparation of Dibenzofurans
摘要:
A new process involving copper-catalyzed aerobic C(sp(2))-H activation, followed by cycloetherification, has been developed. This reaction serves as a direct method for the preparation of multisubstituted dibenzofurans starting with o-arylphenols. The presence of a strong para-electron-withdrawing group (e.g., NO2) on the phenol is essential for the success of the reaction.
The use of ortho-iodonitrophenol in Ugi-Smiles reaction coupled with Heck cyclization gives new access to indole scaffolds. The sequence can be performed in a one-pot reaction if the residual isocyanide is neutralized prior to the addition of the palladium catalyst.
Ugi-Smiles Access to Quinoxaline Derivatives
作者:Laurent El Kaïm、Julie Oble、Marion Gizzi、Laurence Grimaud