Efficient microwave-assisted prenylation of pinostrobin and biological evaluation of its derivatives as antitumor agents
作者:Hadi Poerwono、Shigeru Sasaki、Yoshiyuki Hattori、Kimio Higashiyama
DOI:10.1016/j.bmcl.2010.02.068
日期:2010.4
Pinostrobin (5-hydroxy-7-methoxyflavanone) obtained in relatively large amounts from fingerroot (Boesenbergia pandurata) was converted to its C-6 and C-8 prenylated derivatives. The Mitsunobu reaction, europium(III)-catalyzed Claisen-Cope rearrangement, and Claisen reaction coupled with cross-metathesis were used as the key steps. Using a sealed-vessel microwave reactor, the Mitsunobu and Claisen/Cope reactions occurred smoothly with short reaction times and in satisfactory yields. The target compounds and five new intermediary substances showed cytotoxic activity toward SK-BR-3, MCF-7, PC-3, and Colo-320DM human tumor cell lines, and all of them had significantly lower IC50 (mu M) values than pinostrobin. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.