Regioselective addition of the appropriate arylamines to 2-methyl-1,4benzoquinone followed by a palladium(II)-catalyzed oxidative cyclization opens up an efficient route to the naturally occurring 3-methylcarbazole-1,4-quinone alkaloids murrayaquinone A, koeniginequinone A, and koeniginequinone B.
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Knölker et al. (2003) studied this question.
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