Reduction of a series of substituted flavanones afforded synthetic access to flavan-4-ols and was followed for some of them by an SN2-type acid-catalysis in methanol to provide 4-methoxyflavans. The stereochemistry of these compounds was established by 1H and 13C NMR data. Flavan-4-ols and 4-methoxyflavans have been resolved into enantiomers which are being evaluated as anticancer drugs.
一系列得到合成获得黄烷-4-醇和取代的黄烷酮的还原,随后进行由S它们中的一些Ñ在甲醇2类型的酸催化,以提供4- methoxyflavans。这些化合物的立体化学由1 H和13 C NMR数据确定。黄烷-4-醇和4-甲氧基黄烷已被解析为对映体,其被评估为抗癌药。
An efficient synthesis of novel tetrahydrochromeno[2,3-b]chromenes
作者:Ruth Devakaram、David StC. Black、Naresh Kumar
DOI:10.1016/j.tetlet.2010.05.025
日期:2010.7
A series of novel tetrahydrochromeno[2,3-b]chromenes is synthesized via the acid-catalyzed dimerization reactions of 5-methoxy- or 6-methoxyflavenes. A rational mechanism for the observed rearrangement is proposed. (C) 2010 Elsevier Ltd. All rights reserved.