Mild Regiospecific Synthesis of 1-Alkoxy-isochromenes Catalyzed by Well-Defined [Silver(I)(Pyridine-Containing Ligand)] Complexes
作者:Monica Dell’Acqua、Brunilde Castano、Clara Cecchini、Tommaso Pedrazzini、Valentina Pirovano、Elisabetta Rossi、Alessandro Caselli、Giorgio Abbiati
DOI:10.1021/jo5002559
日期:2014.4.18
The synthesis of 3-substituted-1-alkoxyisochromenes starting from 2-alkynylbenzaldehydes and different alcohols is reported. The reaction is catalyzed by a silver(1) complex with an original macrocyclic pyridine-containing ligand. The approach is characterized by absolute regioselectivity, mild reaction conditions, good to excellent reaction yields, cleanness of the reaction, and reduced purification steps. The reaction mechanism was investigated by in-depth H-1 NMR experiments and an aimed "trapping" experiment.