Synthetic Route to 4,4a- and 3,4-Dihydroxanthones through [4+2] Cycloaddition and Base-Assisted Sigmatropic Rearrangement
作者:Nikita M. Chernov、Roman V. Shutov、Vladimir V. Sharoyko、Nikolay N. Kuz'mich、Alexander V. Belyakov、Igor P. Yakovlev
DOI:10.1002/ejoc.201700310
日期:2017.5.18
The [4+2] cycloaddition of chromone-fused dienes with enamines was found to be an efficient method for the synthesis of 4,4a- and 3,4-dihydroxanthone derivatives. Either product type could be obtained by choosing the proper conditions [reaction time and addition of La(NO3)3 as a Lewis acid]. Calculations using density functional theory and Møller–Plesset perturbation theory showed that the isomerization
发现色氨酸稠合的二烯与烯胺的[4 + 2]环加成是合成4,4a-和3,4-二氢黄酮衍生物的有效方法。可以通过选择适当的条件[反应时间和添加作为路易斯酸的La(NO 3)3 ]获得任何一种产品类型。使用密度泛函理论和Møller-Plesset扰动理论的计算表明,通过碱辅助的σ重排发生了4,4a-二氢黄嘌呤向3,4-二氢黄嘌呤的异构化。所描述的反应为获得具有细胞毒性活性的4,4a-二氢黄嘌呤类化合物的天然产物启发提供了便利的途径。