Intramolecular Palladium-Catalyzed Oxidative Coupling on Thiophene and Furan Rings: Determinant Role of the Electronic Availability of the Heterocycle - Beccalli, Egle M; Borsini, Elena; Broggini, Gianluigi; Rigamonti, Micol; Sottocornola, Silvia (Synlett, 2008)