作者:Zhen Guo、Zhiguo Wang、Yefeng Tang
DOI:10.1021/acs.orglett.8b00315
日期:2018.4.6
The first asymmetric total synthesis of dragonbloodins A1 and A2, a pair of unprecedented chalcone-flavan heterotrimmers, has been achieved through a series of rationally designed or bioinspired transformations. Key elements of the synthesis include a highly efficient heterotrimerization reaction to assemble the two chalcone units and one flavan unit in one pot and a tandem oxidative dearomatizati
通过一系列合理设计或受到生物启发的转化,实现了龙血A1和A2的首次不对称全合成,这是一对前所未有的查尔酮-黄烷异氰酸酯。合成的关键要素包括在一个锅中组装两个查尔酮单元和一个黄烷单元的高效异三聚反应,以及串联氧化脱芳香化/环化/加氧的串联反应,以形成龙血红蛋白A1和A2的多环核心。本合成清楚地证实了龙血素A1和A2的生物遗传关系和绝对立体化学。