Abstract
Reactions of phenols and phenolic silyl ethers 5, 6, and 7 using Weitz' aminium salt, tris(4-bromophenyl)aminium hexachloroantimonate (BAHA), gave the corresponding quinone derivatives 8, 9, and 10, which may be useful synthons for obtaining quassinoids, the bitter principle of Simaroubaceous plants. Treatment of 10a with silica gel powder resulted in the intramolecular conjugate addition to afford the indanone 11 in good yield.
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