Journal
TETRAHEDRON
Volume 70, Issue 22, Pages 3570-3575Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2014.04.007
Keywords
Khaya ivorensis; Limonoid; Ivorenoid; Cytotoxicity
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Funding
- National Natural Science Foundation [81273398]
- Ministry of Science and Technology of the People's Republic of China [2012CB721105]
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Six new limonoids, ivorenoids A-F (1-6), along with ten known analogues, were isolated from an ethanolic extract of the stems of Khaya ivorensis. Their structures were elucidated on the basis of spectroscopic analyses. Compounds 1 and 2 possessed a rare rearranged skeleton of khayanolides and a unique gamma-lactone (C-16/C-8) replacing the common and characteristic delta-lactone D-ring (C-16/C-17) of limonoids. A mechanism of the interesting deuteration of H-2 and H-15 beta of 1, and H-15 beta of the solvent CD3OD due to the keto enol tautomerism was demonstrated. Compounds 3 and 6 showed moderate activity against HL-60 cell line with IC50 values of 15.3 and 17.5 mu M, respectively. (C) 2014 Elsevier Ltd. All rights reserved.
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