| abstract |
There is disclosed novel fused thiophene derivatives as prophylactic and therapeutic drugs for bone or articular diseases, industrially advantageous processes for production thereof, and novel production intermediates. Said fused thiophene derivatives are represented by the general formula (I) wherein R1 is an optionally substituted hydrocarbon, heterocyclic, sulfinyl, sulfonyl, hydroxyl, thiol or amino group,; R2 is cyano, formyl, thioformyl, etc.; ring A is any of formulae (a), (b) or (c) (wherein R3 is hydrogen or an optionally substituted hydrocarbon, heterocyclic, hydroxyl, amino, sulfonyl or acyl; R14 is hydrogen, halogen, optionally subsituted hydrocarbon group, optionally subsituted heterocyclic group etc.; and ring B represents an optionally substituted 5- to 7-membered hydrocarbon ring. |