2,5,6-Trisubstituted N-Methylindoles from Site-Selective Suzuki-Miyaura Cross-Coupling, Twofold Heck and 6π-Electrocyclization-Dehydrogenation Reactions of 2,3,5-Tribromo-N-methylpyrrole

Abstract

Site-selective Suzuki-Miyaura reactions of 2,3,5-tribromo-N-methylpyrrole afforded 5-aryl-2,3-dibromo-N-methylpyrroles. These products were transformed into 2,5,6-trisubstituted N-methylindoles by twofold Heck reactions and subsequent 6p-electrocyclization-dehydrogenation reactions.