A facile copper salts-mediated conversion of thioamides to N-thioacylamidines, amidines, and amides

A convenient synthesis of N-(hetero)arylamides by the oxidative coupling of methylheteroarenes with amines

An oxidative amidation of 2-methylpyridines/2-methylbenzimidazole with amines using copper acetate and elemental sulfur in DMSO to afford various N-(hetero)arylamides has been accomplished. Mechanistic studies reveal the intermediacy of N-(pyridin-2-ylmethyl)aniline and confirm the role of DMSO as the oxygen source.

Crystal structure of N-(4-chloro-phen-yl)benzo-thio-amide

The title compound, C₁₃H₁₀ClNS, exhibits a trans conformation with regard to the axis of the C—N bond. The benzene and phenyl rings are inclined to one another by 85.06 (8)°. In the crystal, mol­ecules are linked by N—H⋯S=C hydrogen bonds, forming chains along [001].