Synthesis of multisubstituted <i>N</i>-(tosylamino)pyrrole derivatives by AuCl₃-catalyzed cycloisomerization of the β-alkynyl hydrazones

<p>A method for preparing multisubstituted <i>N</i>-(tosylamino)pyrrole derivatives through AuCl₃-catalyzed cycloisomerization of the β-alkynyl hydrazone compounds was described. The reaction could be carried out in one pot from the β-ketoesters to give the cyclized products in moderate to excellent yields with low catalyst loadings.