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Seven naturally occurring pyranocarbazole alkaloids (pyrayafoline A-E, O-methylmurrayamine A and O-methylmahanine) have been obtained by total synthesis using a palladium(II)-catalysed oxidative cyclisation of a diarylamine to an orthogonally diprotected 2,7-dihydroxycarbazole as key step.
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Hesse et al. (2014) studied this question.
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