Abstract
Chemical investigation of the dichloromethane extracts of Hoya buotii Kloppenb. afforded taraxerone (1), taraxerol (2), a mixture of β-sitosterol (3a) and stigmasterol (3b) in about 2:1 ratio, and a mixture of α-amyrin cinnamate (4a) and β-amyrin cinnamate (4b) in about 1:2 ratio from the stems; 1, 2, and 3a from the roots; a mixture of 4a and 4b in about 3:2 ratio from the flowers; and 3a, squalene (5) and saturated hydrocarbons from the leaves. The structures of 1-5 were identified by comparison of their NMR data with those reported in the literature.
Highlights
Hoya plants are called wax plants due to the waxy appearance of their leaves or flowers
We earlier reported the isolation of lupenone (I) and lupeol (II) from the roots; II, squalene (III) and β-sitosterol (IV) from the leaves; and betulin (V) from the stems of H. mindorensis Schlechter
We reported the isolation of II, αamyrin (VI), β-amyrin (VII), lupeol acetate (VIII), α-amyrin acetate (IX), and β-amyrin acetate (X) from the stems; and VI, bauerenol (XI), III, lutein (XII), IV, and stigmasterol (XIII) from the leaves of H. multiflora Blume (Ebajo et al, 2015a)
Summary
Hoya plants are called wax plants due to the waxy appearance of their leaves or flowers. Afforded taraxerone (1), taraxerol (2), a mixture of β-sitosterol (3a) and stigmasterol (3b) in about 2:1 ratio, and a mixture of α-amyrin cinnamate (4a) and β-amyrin cinnamate (4b) in about 1:2 ratio from the stems; 1, 2, and 3a from the roots; a mixture of 4a and 4b in about 3:2 ratio from the flowers; and 3a, squalene (5) and saturated hydrocarbons from the leaves.
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