Exploiting Pd<sup>II</sup> and Ti<sup>III</sup> Chemistry To Obtain γ-Dioxygenated Terpenoids: Synthesis of Rostratone and Novel Approaches to Aphidicolin and Pyripyropene A
作者:José Justicia、J. Enrique Oltra、Juan M. Cuerva
DOI:10.1021/jo0502910
日期:2005.10.1
a characteristic γ-dioxygenated system on the A ring, and many of them show interesting pharmacological properties. We have developed a novel strategy for the synthesis of these terpenoids involving three stages: (a) the selective epoxidation of commercial polyenes, (b) titanium(III)-catalyzed cyclization of the epoxypolyprenes thus obtained, and (c) Pd-mediated remote functionalization of the equatorial
实际上,在A环上有几种具有特征性γ-双加氧系统的萜类化合物,其中许多显示出有趣的药理特性。我们已经开发出了用于合成这些萜类化合物的新策略,涉及三个阶段:(a)商业多烯的选择性环氧化;(b)钛(III)催化的由此得到的环氧聚戊二烯的环化;以及(c)Pd介导的远程如此形成的环状萜类化合物的A环上的C-4处连接的赤道甲基的官能化。事实证明,该策略可用于合成天然拉丹烷啡肽(1)和相关的萜类化合物,以及用于药理活性成分蚜虫二萜(2)和吡啶并戊二烯A(3)的先进合成方法。)。