Base-catalysed furan ring transfer reaction of the tetrahydrobenzofurnyl propynyl ether (2) followed by Claisen ([3,3]) rearrangement provides a simple route to the tricyclic furan (8), a versatile intermediate for the synthesis of viridin and related compounds.
Y. Yamaguchi, K. Hayakawa and K. Kanematsu, J. Chem. Soc., Chem. Commun., 1987, 515 DOI: 10.1039/C39870000515
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