Synthesis and Cycloaddition Reaction of 3-Vinylthieno[3,2-b][1]benzothiophene

A new method of synthesis of 3-substituted thieno[3,2- b ][1]benzothiophenes based on a halogen dance process was developed. The cycloaddition reaction of the title compound with dimethyl acetylenedicarboxylate leads to the formation of a complex mixture of products resulting from a series of consecutive reactions of the primary adduct.