Abstract
The 4,4-bisnorgrayanotoxin skeleton was synthesized from the formylated cross-conjugated cyclohexadienones ( 5 and 5′) by a photochemical rearrangement. The nonformylated cyclohexadienone ( 2) gave the spiro compound ( 7) and the phenols ( 8 and 9) on photolysis in aqueous acetic acid.
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