Berkelic Acid: Straightforward Analogue Synthesis and Studies of Activity Against Selected Cancer Cell Lines
作者:Tamara Arto、Inés Sáenz de Santa-María、María-Dolores Chiara、Francisco J. Fañanás、Félix Rodríguez
DOI:10.1002/ejoc.201601194
日期:2016.12
(–)-Berkelic acid is an architecturally unique secondary metabolite isolated from an extremophilic Penicillium species. In this paper, we describe a very simple protocol to construct the central core of this natural product. Using this strategy, not only (–)-berkelic acid, but also a small library of analogues has been accessed. The key point of our protocol is a remarkable silver-catalysed cascade
Eight-Step Asymmetric Synthesis of (–)-Berkelic Acid
作者:Hong-Gang Cheng、Qianghui Zhou、Zhenjie Yang、Ruiming Chen、Liming Cao、Qiang Wei、Qingqing Wang
DOI:10.1055/a-1799-0459
日期:2022.11
This work features a sequential Catellani-type reaction/oxa-Michael addition with epoxides as dual-functionalized alkylating reagents for synthesizing the isochroman framework, a one-pot, acid-catalyzed deprotection/spiroacetalization process for the construction of a tetracyclic core intermediate, and a late-stage Ni-catalyzed reductive coupling reaction for the installation of the side chain. Remarkably
我们在此报告了 (–)-berkelic 酸的八步不对称合成。这项工作的特点是连续 Catellani 型反应/oxa-Michael 加成与环氧化物作为双官能化烷基化试剂用于合成异色满框架,一锅酸催化脱保护/螺缩醛化过程用于构建四环核心中间体,以及用于安装侧链的后期 Ni 催化还原偶联反应。值得注意的是,在去保护/螺缩醛化过程中,从一个现有的手性中心创建了四个具有高立体控制的新立体中心。
Concise total synthesis of (−)-berkelic acid via regioselective spiroacetal/pyran formation
作者:Shogo Hanada、Masahito Yoshida、Hideo Kigoshi
DOI:10.1039/d4cc00166d
日期:——
We successfully developed (1) scalable synthesis of the triol segment and (2) regio- and stereoselective synthesis of the tetracyclic skeleton by tandem spiroacetal/pyran formation from a simpler alkyne precursor, resulting in the achievement of concise total synthesis of (−)-berkelic acid.