3-Nitroindoles are catalytically reduced by hydrogen on palladium/carbon to furnish the relatively unstable aminoindoles, which in the presence of carboxylic acid anhydrides afford good to excellent yields of the corresponding N-acylaminoindoles. 2-Nitroindoles give lower yields of N-acylated 2-aminoindoles.
heteroaromatics by using benzamide radicals with free NH groups generated from N-amidopyridinium salts under visible-light irradiation. The new mode of activation of N-amidopyridinium salts proceeds efficiently under mild conditions to give various benzamide derivatives with free NH groups. In addition, oxazoline analogues, synthesized by the reaction with styrene, demonstrate a substantial range of prospective