efficient protocol for the synthesis of highly substituted cyclopentacarbazolones (50-82%) was developed by employing internalalkynes with 2-bromo-3-formylcarbazoles in the presence of palladium catalyst under ligand-free condition. High regioselectivity was observed for unsymmetrical (alkyl-, aryl-substituted) internalalkynes. estrogen receptors - palladium catalyst - annulations - cyclopentacarbazolones