4H,6H-thieno[3,4-c]furan 5,5-dioxide 1 was readily converted to the 4-alkylated compounds 2 and the appropriate compounds 2 were submitted to intramolecular Diels–Alder reactions to afford fused furans 8a and b in good yields.
K. Ando, N. Akadegawa and H. Takayama, J. Chem. Soc., Chem. Commun., 1991, 1765 DOI: 10.1039/C39910001765
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