Aryl radicals react with 2-(2-phenylethynyl) phenyl isothiocyanate through a novel radical cascade reaction entailing formation of α-(arylsulfanyl) imidoyl radicals and affording a new class of compounds, ie thiochromeno [2, 3-b] indoles. These derivatives are formed as mixtures of substituted analogues arising from competitive [4+ 2] and [4+ 1] radical annulations. The isomer ratio is strongly dependent on the aryl substituent and is ...
