Cycloaddition of cross-conjugated trienes to halogenated quinones
The chemoselectivity of [4+2] cycloadditions involving electron-rich cross-conjugated trienes and halogenated quinones has been examined. The approach provides improved preparations of 6-acetyl-2,3,7-trihydroxyjuglone, solorinic and norsolorinic acids, and averythrin. It also confirms the structure proposed for haematommone and 3,8-dihydroxy-4-methoxy-2-methoxycarbonyl-1-methylanthraquinone but invalidates that of sopheranin.
Couturier,Brassard
p. 703 - 708
(2007/10/02)
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