Ligand-Enabled Ni–Al Bimetallic Catalysis for Nonchelated Dual C–H Annulation of Arylformamides and Alkynes
摘要:
A bifunctional secondary phosphine oxide (SPO) ligand-controlled method was developed for Ni-Al-catalyzed nonchelated dual C-H annulation of arylformamides with alkynes, providing a series of substituted amide-containing heterocycles in <= 97% yield. The SPO-bound bimetallic catalysis proved to be critical to the reaction efficiency.
Substituted quinolones were efficiently synthesized via the nickel-catalyzed cycloaddition of o-cyanophenylbenzamide derivatives with alkynes. The reaction involves elimination of a nitrile group by cleavage of the two independent aryl–cyano and aryl–carbonyl C–C bonds of the amides.