作者:Fei Tang、Yang Wang、Ai-Jun Hou
DOI:10.1016/j.tet.2014.04.089
日期:2014.7
efficient total syntheses of Nigrasin I and Kuwanon C, two biologically interesting natural flavonoids with two regioisomeric isoprenyl side chains, were realized for the first time starting from commercially available 1-(2,4,6-trihydroxyphenyl)ethanone via a linear reaction sequence of 11 steps with the overall yields of 22% and 21%, respectively, in which the selection of protective groups and the Claisen
从市售的1-(2,4,6-三羟基苯基)乙酮通过线性反应序列首次实现了对具有两个具有生物异构异戊二烯基侧链的生物学上有趣的天然黄酮-黑色素I和Kuwanon C的高效总合成其中11个步骤的总收率分别为22%和21%,其中保护基团的选择和盟友化的16个化合物的克莱森重排采用了合成策略。公开了使用乙酸酐作为溶剂和使用微波辐射对于有效和选择性的克莱森重排至关重要。