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The first total synthesis of korupensamines A (la) and B (lb), highly polar naphthylisoquinoline alkaloids and, simultaneously, 'monomeric building blocks' of the michellamines, is described.Key step is the Pd" catalyzed intermolecular biaryl coupling of the two appropriately protected naphthalene and isoquinoline moieties (10) and ( l l ) , with the
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Bringmann et al. (1994) studied this question.
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