Synthetic Studies Directed Towards Various Homologues of Natural Sesquiterpene-Coumarin Ethers: The Domino Approach
作者:Andrei Corbu、Juan M. Castro、Maurizio Aquino、Zoila Gandara、Pascal Retailleau、Siméon Arseniyadis
DOI:10.1002/ejoc.200901352
日期:2010.3
A domino-based strategy was used to construct analogues containing the basic skeleton of the monocyclic sesquiterpene-coumarinethers galbanic acid (1) and secodrial (3), through conversion of the domino adduct 19 into 10 and 11, chosen as representative targets. 1 H NMR patterns, corroborated by X-ray crystallographic analysis for two of the four possible diastereomeric arrangements of the six-membered
通过将多米诺加合物 19 转化为 10 和 11,选择作为代表性目标,使用基于多米诺骨牌的策略来构建包含单环倍半萜烯-香豆素醚 galbanic 酸 (1) 和二元 (3) 基本骨架的类似物。已经确定了 1 H NMR 模式,通过 X 射线晶体学分析证实了各种 A-seco 萜烯共有的六元 B 环的四种可能非对映异构排列中的两种。观察到的趋势有助于设计取代基组合,为非对映体识别提供工具,这取决于相邻甲基的顺式/反式排列和采用的构象。
Total Synthesis and Structural Confirmation of <i>ent</i>-Galbanic Acid and Marneral
capitalizing on a highlyselective Claisen rearrangement, ent-galbanic acid 1 and (+)-marneral 2 have been synthesized. The relative configurations of (+)- 1 and (+)- 2 were unambiguously established by X-ray crystallographic analysis of the precursors 11a and 20, with the absoluteconfiguration ensuing from their derivation from R-pulegone. In this way, the controversial issue of the configuration of galbanic