Indoles have been known as pharmacologically and biologically active compounds. Thus, many conventional named and transition metal-catalyzed synthetic methods have been developed and documented for the indole framework formation. 1., , , and In connection with this report, during the course of our ongoing studies on homogeneous ruthenium catalysis, 2., , , , 3., , , , , , 4., 5., , and we have also reported on the formation of indoles via a ruthenium-catalyzed ...
