Three unusually prenylated naphthoquinones (1), (5), and (6) of Streptocarpus dunnii are found to be biosynthesised via(2), (8), (9) and the Claisen type rearrrangement product (10) of the latter, while two anthraquinones (3) and (4) of the same plant are shown to be formed in a prenylation mode different from that of the structurally related anthraquinones of Rubiaceous plants.
K. Inoue, S. Ueda, H. Nayeshiro and H. Inouye, J. Chem. Soc., Chem. Commun., 1982, 993 DOI: 10.1039/C39820000993
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