Abstract
A versatile protocol for solid phase synthesis of highly substituted thiophene derivatives and their activity against the PDE-4 enzyme are discussed. This protocol employs 3-hydroxymethylthiophene-2-boronic acid ( 5) as the scaffold and sequential palladium catalyzed cross-coupling reactions as the CC bond forming step. This methodology allows convenient modification of the thiophene core from three directions, giving rise to structurally diverse derivatives with overall high chemical purity and yield. A novel series of potent PDE-4 inhibitors have been identified from these compounds.
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