4-H, 6H-Thieno[3,4-c]furan 5,5-dioxide 1 was converted into compounds 4 and 6, which readily cyclised to give stereoselectively the functionalised tricyclic compound 5 in good yield.
T. Hayashi, Y. Kawakami, K. Konno and H. Takayama, J. Chem. Soc., Perkin Trans. 1, 1993, 2387 DOI: 10.1039/P19930002387
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