synthetic route for the preparation of a series of functionalized mixed thiophene/furanoligomers is described. This method, involving a Mn(OAc)3-mediated oxidative addition of β-thienyl-β-keto esters (=β-oxothiophenepropanoates) to methyl 3-thienylprop-2-enoates, allows the construction of highly functionalized heteropolyaromatic oligomers possessing various chain lengths (Schemes 2, 4, and 5). Moreover