作者:Yuan-Shan Yao、Zhu-Jun Yao
DOI:10.1021/jo801017b
日期:2008.7.1
Total syntheses of cassiarins A and B have been efficiently accomplished using a common strategy with biomimetic considerations. Key reactions involved in this synthesis include a Negishi-type coupling, a Ag(I)-promoted formation of the tricyclic 8H-pyrano[2,3,4-de]chromen-8-one core, and a sequential amine-condensation and cyclization. Three new analogues of cassiarin A bearing different substituents
使用仿生学的通用策略已有效地完成了卡西林A和B的总合成。参与该合成的关键反应包括Negishi型偶联,Ag(I)促进的三环8 H-吡喃并[2,3,4- de ] chromen -8-one核的形成以及顺序的胺缩合和环化。从同一中间体平行合成了三个新的肉桂素A类似物,它们在C-11位置带有不同的取代基。另外,从相应的化学等效前体获得了对关键三环核心和卡西林A和B的另外两个转化。