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
Palladium mediated C–H activation in the field of terpenoids: synthesis of rostratone
作者:José Justicia、J.Enrique Oltra、Juan M. Cuerva
DOI:10.1016/j.tetlet.2004.04.005
日期:2004.5
activation can be used under mild conditions for the remote functionalization of C-4 methyl groups of molecules with different terpenoid-like skeletons containing six- or seven-membered A rings. This procedure has allowed us to complete a novel strategy for the synthesis of γ-dioxygenated terpenoids in three stages: (i) selective epoxidation of commercial polyenes, (ii) titanium(III)-catalyzed cyclization