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Pharmaceuticals 2009, 2(2), 33-43; doi:10.3390/ph2020033

Antitumor Activity of Some Prenylated Xanthones

2, 1, 1,3 and 1,4,*
Received: 1 July 2009 / Revised: 29 July 2009 / Accepted: 10 August 2009 / Published: 11 August 2009
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Pyranoxanthones 6-8 were obtained by dehydrogenation of the respective dihydropyranoxanthones 3-5 with DDQ in dry dioxane. Two prenylated xanthones 10,11 were obtained from the reaction of 1-hydroxyxanthone (9) with prenyl bromide in alkaline medium, or by condensation of xanthone 9 with isoprene in the presence of orthophosphoric acid. The structural elucidation of the two new compounds 6,11, as well as an update of data for the already described prenylated derivatives 7,8,10 were accomplished by IR, UV, HRMS and NMR (1H, 13C, HSQC and HMBC) techniques. The effect of the prenylated xanthone derivatives on the in vitro growth of human tumor cell lines MCF-7 (breast adenocarcinoma) and NCI-H460 (non-small cell lung cancer) is also reported. Compounds 10 and 11 have been found to exhibit a moderate growth inhibitory activity against the MCF-7 cell line.
Keywords: xanthones; prenylation; dehydrogenation; antitumor activity; NMR spectroscopy xanthones; prenylation; dehydrogenation; antitumor activity; NMR spectroscopy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Castanheiro, R.A.; Silva, A.M.; Campos, N.A.; Nascimento, M.S.; Pinto, M.M. Antitumor Activity of Some Prenylated Xanthones. Pharmaceuticals 2009, 2, 33-43.

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