Abstract
Anionic annulation of phthalide sulfones 3 with quinone monoketals 6, accessible by phenyliodonium diacetate oxidation of naphthols 5, offers a high yielding regiospecific entry to benz[ a]anthraquinones 8. Similar annulation of cyanophthalide 13 with 12, followed by photooxygenation of 14 results in a complementary route to the basic skeleton 15 of nonaromatic A - ring angucyclines.
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