An Efficient Approach to Dihydrofuroflavonoids<i>via</i>Palladium-Catalyzed Annulation of 1,3-Dienes by<i>o</i>-Iodoacetoxyflavonoids
作者:Roman V. Rozhkov、Richard C. Larock
DOI:10.1002/adsc.200404226
日期:2004.12
The palladium-catalyzed annulation of 1,3-dienes by o-iodoacetoxyflavonoids provides an efficient approach to biologically interesting dihydrofuroflavonoids. This reaction is very general, stereo- and regioselective, and a widevariety of terminal, cyclic and internal 1,3-dienes can be utilized.
A series of chrysin derivatives, prepared by alkylation, halogenation, nitration, methylation, acetylation and trifluoromethylation, were tested in vitro against human gastric adenocarcinoma cell line (SGC-7901) and colorectal adenocarcinoma (HT-29) cells. Among these derivatives of chrysin, 5,7-dimethoxy-8-iodochrysin 3 and 8-bromo-5-hydroxy-7-methoxychrysin 11 have the strongest activities against SGC-7901 and HT-29 cells, respectively. 5,7-Dihydroxy-8-nitrochrysin 12 were found to have strong activities against both SGC-7901 and HT-29 cells. (C) 2003 Elsevier Science Ltd. All rights reserved.