Abstract
We previously reported that the phenanthroindolizidine alkaloid 3 and its derivatives had markedly potent in vitro cytotoxicity. However, they had low in vivo antitumor activities and high in vivo toxicities, which was a serious problem for further development. Based on the finding that antitumor activity and toxicity could be improved by acetylation of 3, we synthesized new derivatives of 3, which possessed various acyl groups, and evaluated their antitumor activities and toxicities. We found that derivatives with sterically less bulky acyl groups had improved antitumor activities.
Keywords: Asclepiadaceae family, Ideopsis similis, alkaloids, acylated derivatives, anti-inflammatory, Meth A sarcoma, cytotoxicities, pharmacokinetic parameters, Carbonate-type derivatives, H-NMR spectra
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