Department of Chemistry, Stanford University , Stanford, California 94305-5080, United States.
Org Lett. 2013 Oct 18;15(20):5274-7. doi: 10.1021/ol4024997. Epub 2013 Oct 4.
A convergent synthetic route toward cytotoxic agent peloruside A that hinges on the use of an alkyne linchpin to assemble the natural product is described. Other highlights of this synthesis include an asymmetric desymmetrization reaction of a 1,3-diol, a one-pot conversion of a dibromoolefin to a stereodefined enone, and a diastereoselective aldol condensation. Misassignment of the absolute stereochemistry of the C18 stereocenter in our synthesis provided the natural product epimeric at the C18 ethyl stereocenter.
描述了一种具有细胞毒性的 peloruside A 类似物的汇聚合成路线,该路线的关键在于使用炔烃连接子来组装天然产物。该合成的其他亮点包括 1,3-二醇的不对称去对称化反应、二溴烯烃一锅转化为立体定义的烯酮以及立体选择性的羟醛缩合反应。我们合成中 C18 立体中心的绝对立体化学的错误分配导致了与天然产物在 C18 乙基立体中心具有对映异构体的产物。