A cascade iridium-catalysed oxindolesynthesis was achieved using pyridyl-protected anilines and bis(2,2,2-trifluoroethyl) 2-diazomalonate. The developed protocol is simple and scalable, and has a broad scope and excellent regioselectivity. The pyridyl directing group can easily be removed. The method was further extended to give C-7-functionalized oxindole derivatives in a straightforward manner.
catalyzed C-H phosphorylation remains an unsolved challenge. Reported methods are generally limited in scope and require stoichiometric silver salts as oxidants. Reported here is an electrochemically driven RhIII -catalyzedarylC-H phosphorylation reaction that proceeds through H2 evolution, obviating the need for stoichiometric metal oxidants. The method is compatible with a variety of arylC-H and P-H
Sterically Controlled Ru(II)-Catalyzed Divergent Synthesis of 2-Methylindoles and Indolines through a C–H Allylation/Cyclization Cascade
作者:Manash Kumar Manna、Gurupada Bairy、Ranjan Jana
DOI:10.1021/acs.joc.8b01034
日期:2018.8.3
A ruthenium-catalyzedsynthesis of 2-methylindole was accomplished via a C–H allylation/oxidative cyclization cascade. Strategically, β-hydride elimination from the σ-alkyl-Ru intermediate has been suppressed by steric hindrance from a remote position. Hence, 2-methylindolines from the corresponding ortho-substituted anilines were achieved via protodemetalation in lieu of β-hydride elimination under
Palladium-Catalyzed Carbonylative [3+2+1] Annulation of<i>N</i>-Aryl-Pyridine-2-Amines with Internal Alkynes by CH Activation: Facile Synthesis of 2-Quinolinones
We describe here a novel procedure for the synthesis of highly substituted 2‐quinolinones. By this newly developed approach, 2‐quinolinone derivatives were prepared in moderate to good yields by carbonylative cyclization of N‐aryl‐pyridine‐2‐amines and internal alkynes by CH activation. Remarkably, [Mo(CO)6] was applied as a solid CO source and the reaction proceeded in an atom economic manner.
Herein, a series of SPO-RhIII complexes relevant to RhIII-catalyzed C–H phosphorylation was isolated and fully characterized. Detailed research on their reactivities in C–H rhodation indicates the crucial role of a suitable base to reduce the deactivation of RhIII by SPOs. Finally, using silver carbonate as both a base and an oxidant, an efficient RhIII-catalyzed aryl C–H phosphorylation with diarylphosphine