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Drüsenfarbstoffe aus Labiaten: Die polaren Diterpenoide aus Plectranthus argentatus S. T. B LAKE
Author(s) -
Alder Alfredo Carlos,
Rüdi Peter,
Eugster Hans
Publication year - 1984
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19840670616
Subject(s) - chemistry , plectranthus , coleus , stereochemistry , botany , biology , lamiaceae
Polar Diterpenoids from Leaf‐Glands of Plectranthus argentatus S. T. B LAKE 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 .