The palladium-catalyzed benzylic-like nucleophilic substitution of benzofuran-2-ylmethyl acetate with N, S, O and C soft nucleophiles has been investigated. The success of the reaction is dramatically influenced by the choice of catalytic system: with nitrogen based nucleophiles the reaction works well with Pd2(dba)3/ dppf, while with sulfur, oxygen and carbo-nucleophiles [Pd(η3-C3H5)Cl]2/XPhos is more efficient. The regiochemical outcome shows that the nucleophilic substitution occurs only on the benzylic position of the η3-(benzofuryl)methyl complex. The high to excellent yields and the simplicity of the experimental procedure make this protocol a versatile synthetic tool for the preparation of 2-substituted benzo[b]furans.
Palladium-catalyzed Tsuji–Trost-type reaction of benzofuran-2-ylmethyl acetates with nucleophiles / Arcadi, Antonio; Fabrizi, Giancarlo; Fochetti, Andrea; Ghirga, Francesca; Goggiamani, Antonella; Iazzetti, Antonia; Marrone, Federico; Mazzoccanti, Giulia; Serraiocco, Andrea. - In: RSC ADVANCES. - ISSN 2046-2069. - (2021), pp. 909-917. [10.1039/d0ra09601f]