Journal
ORGANIC LETTERS
Volume 8, Issue 17, Pages 3845-3848Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol061466a
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Two novel tetranortriterpenoids, turrapubesins A (1) and B (2), representing the first examples of halogenated and maleimide-bearing limonoids, were isolated from the twigs and leaves of Turraea pubescens. The structures of 1 and 2 were elucidated by extensive spectroscopic analysis. Their absolute configurations were determined by X-ray crystallography of 1 and by CD analysis of a dihydrogenated derivative of 2. Turrapubesin A (1) exhibited weak cytotoxicity against the P-388 tumor cell line.
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