Biomimetic Formation of Macrocyclic Spermine Alkaloids
摘要:
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.
New reagent for oxidative phenol coupling. The transformation of the monocyclic spermine base (S)-dihydroxyverbacine to the bicyclic alkaloid (S,S,S)-aphelandrine by cell free extract of barley seedlings
作者:Lenka Nezbedová、Manfred Hesse、Konstantin Drandarov、Christa Werner
DOI:10.1016/s0040-4039(01)00670-0
日期:2001.6
The soluble protein fraction of barley seedlings (Hordeum vulgare, Gramineae) in the presence of O-2 stereoselectively catalyzes the intramolecular phenol coupling of the monocyclic spermine base (S)-dihydroxyverbacine to the bicyclic aphelandrine in preparative yield. The expected microsomal-bond cytochrome P-450 enzyme system does not contribute to this reaction. The nature of the involved biocatalyst still remains uncertain. The catalytic potential of the cell free extract of barley seedlings suggests its possible use as an efficient tool for large scale stereoselective chemoenzymatic synthesis of aphelandrine type alkaloids. (C) 2001 Elsevier Science Ltd. All rights reserved.
Biomimetic Formation of Macrocyclic Spermine Alkaloids
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.
Die absolute Konfiguration des Spermin-Alkaloides Aphelandrin
作者:Armin Guggisberg、Roland Prewo、Manfred Hesse
DOI:10.1002/hlca.19860690508
日期:1986.7.30
The Absolute Configuration of the Spermine Alkaloid Aphelandrine