REGIOSELECTIVE SYNTHESIS OF 3,4-DI(CARBOCYCLYL OR HETEROCYCLYL)THIOPHENES

摘要

A novel process for preparing 3,4-di(carbocyclyl or heterocyclyl)thiophenes comprising reacting a compound of Formula IV:with a ring cyclizing reagent to form the compound of Formula V to yield a compound of Formula V:wherein R1, R2 and R3 are as defined in the specification.