Palladium-catalyzed cyclisation-deprotection of o-halodiarylacetamides, obtained by C-N copper assisted coupling, to the corresponding 6H-Thieno-[2,3-c]carbazole

With the aim of obtaining potential anti-tumoural thienocarbazoles by a ring B convergent method of synthesis, o-halodiarylacetamides were prepared by copper assisted C-N coupling' from 2-bromo-iodobenzene and 6-acetamido-2,3,5-trimethylbenzolb]thiophene, prepared from the 6-acetyl compound.