A metal-free oxidative cycloaddition reaction of substituted benzamides and alkynes has been developed for the synthesis of isoquinolones by using bis(trifluoracetoxy)iodobenzene (PIFA) and trifluoroacetic acid (TFA). Under mild conditions, a wide variety of isoquinolones were conveniently prepared via oxidative annulation of simple N-methoxybenzamide and diarylacetylene or aryl/alkyl acetylene derivatives
Organocatalytic Oxidative Annulation of Benzamide Derivatives with Alkynes
作者:Srimanta Manna、Andrey P. Antonchick
DOI:10.1002/anie.201404222
日期:2014.7.7
Organocatalytic annulation by functionalization of benzamide derivatives with alkynes has been developed. We report a new approach of cycloaddition under mild reaction conditions using simple catalysts, such as iodobenzene and peracetic acid, as oxidant. Those novel, mild reaction conditions provided a straightforward synthesis of isoquinolones with fast reaction rate. Notable selectivity in annulation of unsymmetrically
Pd/C-Catalyzed Synthesis of Isoquinolones through CH Activation
作者:Zhen Shu、Wei Li、Baiquan Wang
DOI:10.1002/cctc.201403059
日期:2015.2
The direct synthesis of isoquinolones from benzamides and alkynes through CHactivation was developed by using Pd/C as a heterogeneous catalyst without a ligand under mild conditions. A variety of isoquinolones were obtained in good yields with excellent regioselectivities. The Pd/C catalyst could be recycled three times without a significant decrease in the activity (yields as high as 85 %).