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Abstract
Dihydroxyverbacine (10), a precursor for oxidative phenol coupling, was obtained via (±)-buchnerine (14), whose synthesis is described. The oxidizing system hemin (ferriprotoporphyrin IX chloride)/H2O2 promoted intramolecular coupling of 10 to give the alkaloids aphelandrine (1), orantine (2), and chaenorpine (7). The alkaloids were identified by on-line coupled HPLC and atmospheric-pressure chemical-ionization (APCI) mass spectrometry.
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