Practical Pd/C-Catalysed Suzuki-Miyaura Reactions for the Preparation of 3-Aryl-4-oxypyridin-2(1H)-ones, 3-Aryl-2,4-oxypyridines and 3-Aryl-2,4-oxyquinolines as Useful Intermediates for the Synthesis of Biologically Active Compounds

Practical heterogeneous Pd/C-catalysed SuzukiMiyaura cross-coupling reactions of 3-iodo-4-oxypyridin-2(1H)-ones, 3-iodo-2,4-oxypyridines, and 3-iodo-2,4-oxyquinolines with arylboronic acids are described as a useful and efficient alternative to homogeneous conditions. The methodology features ligand-free and environmentally friendly conditions, and tolerates a wide range of boronic acids. The cross-coupled products can be viewed as useful intermediates for the preparation of 3-aryl-4-hydroxypyridin-2(1H)-ones, which can be used as new nucleobases for antiherpetic agents.