regioselective carbon–sulfur-bond-forming electrophilic aromatic substitution reaction. The reaction occurred under mild conditions, and the products were obtained in good to excellent yields. The method represents an efficient preparation of sulfenyl aza-aromatics, which are useful intermediates for important organic transformations, due to the great importance of functionalized indoles among natural compounds
procedure for the sulfenylation of indoles and pyrroles based on an aromatic substitution with α-acylthiones used as electrophiles is described. The sulfenylating species were obtained, under very mild reaction conditions, from N-thiophthalimides, using a weak base (pyridine or triethylamine) as promoter. The overall yields obtained are comparable with those obtained by other known sulfenylation protocols