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Nudicaulins, Yellow Flower Pigments of Papaver nudicaule: Revised Constitution and Assignment of Absolute Configuration

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journal contribution
posted on 04.01.2013 by Evangelos C. Tatsis, Anu Schaumlöffel, Anne C. Warskulat, Georges Massiot, Bernd Schneider, Gerhard Bringmann
The constitution of the aglycon of nudicaulin has been revised to be a pentacyclic indole alkaloid. The relative and absolute configurations of the two diastereomers, nudicaulins I (3a) and II (3b), have been assigned by NMR, conformational analyses, and interpretation of the experimental ECD spectra by quantum-chemical calculations.