synthesis features a Catellani reaction/oxa‐Michael cascade for the construction of the isochroman scaffold, a one‐pot deprotection/spiroacetalization operation for the formation of the tetracyclic core structure, and a late‐stage Ni‐catalyzed reductive coupling for the introduction of the lateral chain. Notably, four stereocenters are established from a single existing chiral center with excellent stereocontrol
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
Scalable Total Synthesis of (−)-Berkelic Acid by Using a Protecting-Group-Free Strategy
作者:Francisco J. Fañanás、Abraham Mendoza、Tamara Arto、Baris Temelli、Félix Rodríguez
DOI:10.1002/anie.201109076
日期:2012.5.14
polycyclic core of (−)‐berkelic acid (1) was constructed in just one step from very simple starting materials. The totalsynthesis of 1 involves a seven‐step linear sequence. Protection/deprotection steps were avoided and all but the last step were performed on a gram scale. This synthesis could solve the supply problem associated with the exhaustion of the natural source.
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。