Indole and the anthocyanin orientalin proceed through a unique cascade sequence that leads to nudicaulins I and II in 92% yield. This biomimetic synthesis confirms the biosynthesis proposal for these structurally unprecedented flavoalkaloids that play a key role in the colour range displayed by the Iceland poppy.
R. Devlin and J. Sperry, Chem. Commun., 2019, 55, 13594 DOI: 10.1039/C9CC07943B
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