Total Synthesis of Proteasome Inhibitor (−)-Omuralide through Asymmetric Ketene [2 + 2]-Cycloaddition
作者:Pauline Rullière、Alexandre Cannillo、Julien Grisel、Pascale Cividino、Sébastien Carret、Jean-François Poisson
DOI:10.1021/acs.orglett.8b01851
日期:2018.8.3
The total synthesis of (−)-omuralide, a potent specific proteasome inhibitor, has been achieved through an unprecedented route. The C3 and C4 chiral centers of the natural product have been selectively installed by an asymmetric [2 + 2]-cycloaddition between an unusual oxadisilinane ketene and a chiral enol ether, while the γ-lactam core was prepared by a single-pot two-step Beckmann transposition
有效的特异性蛋白酶体抑制剂(-)-omuralide的总合成已通过史无前例的途径得以实现。天然产物的C3和C4手性中心是通过不寻常的恶二硅氧烷酮与手性烯醇醚之间的不对称[2 + 2]-环加成而选择性安装的,而γ-内酰胺核是通过单锅两步制备的。一步贝克曼换位。C5季中心最终由螺环恶二硅烷基烷的原始选择性氧化脱对称作用所决定,这要归功于近端羟基的邻位异构体辅助。