Intramolecular reaction of an enol silyl ether with a dioxonium ion generated by treatment of the 1,5,7-trioxaspiro[5.5]undecane (5b) with BF3·Et2O was the key step in a synthesis of the 1,7-dioxaspiro[5.5]undecane moiety (2) of Milbemycin β3(1).
P. Kocienski and S. D. A. Street, J. Chem. Soc., Chem. Commun., 1984, 571 DOI: 10.1039/C39840000571
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