Total synthesis and structure–activity relationship study of the potent cAMP signaling agonist (−)-alotaketal A
作者:Jinhua Huang、Jessica R. Yang、Jin Zhang、Jiong Yang
DOI:10.1039/c3ob40120k
日期:——
A detailed account of the first total synthesis of alotaketal A, a tricyclic spiroketal sesterterpenoid that potently activates the cAMP signaling pathway, is provided. The synthesis employs both intra- and intermolecular reductive allylation of esters for assembling one of the fragments and their coupling. A Hg(OAc)2-mediated allylic mercuration is used to introduce the C22-hydroxyl group. The subtle influence of substituents over the course of the spiroketalization process is revealed. The synthesis confirms the relative and absolute stereochemistry of (â)-alotaketal A and allows verification of alotaketal A's effect over cAMP signaling using reporter-based FRET imaging assays with HEK 293T cells. Our studies also revealed alotaketal A's unique activity in selectively targeting nuclear PKA signaling in living cells.
提供了对alotaketal A的首次完全合成的详细描述。alotaketal A是一种三环螺烯糖甙类化合物,能够有效激活cAMP信号通路。该合成采用了酯的分子内和分子间还原烯丙基化反应来组装其中一个片段及其耦合。通过Hg(OAc)2介导的烯丙基汞化反应引入了C22-羟基。合成过程中取代基的微妙影响被揭示出来。此合成确认了(â)-alotaketal A的相对和绝对立体化学,并可以使用HEK 293T细胞的报告基FRET成像实验验证alotaketal A对cAMP信号的影响。我们的研究还揭示了alotaketal A在活细胞中选择性靶向核PKA信号的独特活性。