Tetrahedron Letters p. 5987 - 5990 (1988)
Update date:2022-08-04
Topics:
Brimble, Margaret A.
Hodges, Richard
Stuart, Susan J.
The ceric ammonium nitrate oxidation of the furo<3,2-b>naphtho<2,1-d>furan-8(9H)-ones (5c,5d) gave the rearranged hemiketals (11c,11d) in 72-76percent yield.Reduction of the hemiketals (11c,11d) provided an entry to a pyranonaphthoquinone with a fused γ-lactone as present in the pyranonaphthoquinone antibiotics kalafungin (6) and nanaomycin D (7).
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