A highly active, air- and moisture-stable and easily recoverable
magnetic-nanoparticle-supported palladium catalyst has been developed
for the Suzuki cross-coupling reaction of organoboron derivatives
with alkynyl bromides. In the presence of palladium catalyst (0.5
mol%), organoboron derivatives including aromatic and aliphatic
boronic acids, potassium aryltrifluoroborates, and sodium tetraphenylborate
reacted smoothly with 1-bromo-2-substituted acetylenes to generate
the corresponding cross-coupling products in good to excellent yields
in ethanol. In addition, it is possible to recover and reuse the
supported palladium catalyst at least 16 times without significant
loss of its catalytic activity.
palladium catalyst - Suzuki coupling reaction - organoboronic
acids - alkynyl bromides - magnetic nanoparticles