A General Synthetic Route to 2,2':5',2''-Terpyrrole, 2,5-Bis(2-pyrryl)thiophene, and Alkyl-Substituted Analogues
A new four-step route to 2,2':5',2''-terpyrroles (4, 13) and 2,5-bis(2-pyrryl)thiophenes (6, 14) is described.The key step involves a Stetter reaction between an electron-deficient pyrrole aldehyde and divinyl sulfone.The resulting symmetrical 1,4-diketon