The Sonogashira–Glaser sequence combined with a microwave-assisted cyclization is
a powerful tool to synthesize unsymmetrically substituted conjugated thiophenes. A
variety of 3-(hetero)arylmethyl-2,5-di(hetero)aryl-substituted thiophenes could be
synthesized in moderate to excellent yields using a single Pd/Cu catalyst system.
The presented method is strikingly simple to perform using commercially available
starting materials. The obtained trisubstituted oligothiophene derivatives are interesting
molecules for materials science.
Key words
copper - cross-coupling - heterocycles - multicomponent reactions - palladium - thiols