Studies Directed Toward the Regioselective Carboxylation of the 4-Oxo-4,5,6,7-Tetrahydrothieno-[3,2-C]pyridine Ring System

Abstract
Carboxylation of 4-oxo-4,5,6,7-tetrahydro[3,2-c]pyridine was achieved using a metallation/carbonylation strategy with desired regioselectivity provided by the existing oxo directing group.