The ruthenium-catalyzed coupling reactions of benzamides with alkynes in the presence of acetic acid as a promoter smoothly proceeded regio- and stereoselectively through a directed C-H bond cleavage to produce the corresponding ortho-alkenylated products. Phenylpyrazoles and related substrates also underwent a similar coupling to give dialkenylated products selectively. Several competitive experiments were performed to obtain mechanistic insight into both the mono- and dialkenylation reactions.
Rhodium-catalyzed Direct Coupling of Benzothioamides with Alkenes and Alkynes through Directed C–H Bond Cleavage
作者:Yuki Yokoyama、Yuto Unoh、Rebekka Anna Bohmann、Tetsuya Satoh、Koji Hirano、Carsten Bolm、Masahiro Miura
DOI:10.1246/cl.150444
日期:2015.8.5
Rhodium-catalyzed direct coupling of benzothioamides with alkenes proceeds smoothly involving ortho-C–H bond cleavage. The thioamides also couple with alkynes under similar conditions accompanied b...