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Structural elucidation by high field 2D nmr and FAB-ms/ms techniques led to cyclo-(Pro-Thr-Pro-Phe-Ile-Phe-Ser) as the assignment for phakellistatin(4)a new cell growth inhibitory peptide from the Chuuk Archipelago marine sponge Phakellia costata.
The first total synthesis of korupensamines A (1a) and B (1b), highly polar naphthylisoquinoline alkaloids and, simultaneously, monomeric building blocks of the michellamines, is described. Key step is the Pd II catalyzed intermolecular biaryl coupling of the two appropriately protected naphthalene and isoquinoline moieties (10) and (11), with the coupling positions activated by...
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