Polar Diterpenoids from Leaf‐Glands of Plectranthus argentatus S. T. BLAKE From the red leaf‐glands of the Australian Plectranthus argentatus the following novel diterpenoids were isolated: coleon‐U‐quinone (1), 8α,9α‐epoxycoleon‐U‐quinone (3), 6β‐formyloxy‐7α‐hydroxyroyleanone (7), and 5,6‐dihydrocoleon U (10), besides the already known compounds 6β, 7α‐dihydroxyroyleanone (4), 7α‐acetoxy‐6β‐hydroxyroyleanone (5), and 7α‐formyloxy‐6β‐hydroxyroyleanone (6). Epoxydation of 1 by perborate led in 32% yield to the epoxyquinone 3.
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Alder et al. (1984) studied this question.
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