Copper-catalyzed synthesis of benzo[4,5]thiazolo[3,2-<i>a</i>]indoles from elemental sulfur and 1-(2-iodophenyl)-1<i>H</i>-indoles

This is the first example of making benzo[4,5]thiazolo[3,2- a ]indoles from cheap and odourless elemental sulfur.