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

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• 作者：Evangelos C. Tatsis ; Anu Schauml枚ffel ; Anne C. Warskulat ; Georges Massiot ; Bernd Schneider ; Gerhard Bringmann
• 刊名：Organic Letters
• 出版年：2013
• 出版时间：January 4, 2013
• 年：2013
• 卷：15
• 期：1
• 页码：156-159
• 全文大小：259K
• 年卷期：v.15,no.1(January 4, 2013)
• ISSN：1523-7052

文摘

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.