Reaction of the anion of 3-cyano-4-methoxy-3H-isobenzofuran-1-one (4b) with levoglucosenone affords a chiral annelation products useful for the synthesis of naphtho[2.3-c]pyran-5,10-quinone antibiotics.
J. N. Freskos and J. S. Swenton, J. Chem. Soc., Chem. Commun., 1985, 658 DOI: 10.1039/C39850000658
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