An enantiospecific synthesis of the spiroacetal sub-unit of avermectins B1b and B2b from the optically pure precursors acetylene(3) and lactone (4) is reported.
R. Baker, C. J. Swain and J. C. Head, J. Chem. Soc., Chem. Commun., 1985, 309 DOI: 10.1039/C39850000309
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