Stereoselective synthesis of (±)-β-elemene by a doubly diastereodifferentiating internal alkylation: a remarkable difference in the rate of enolization between syn and anti esters
作者:Deukjoon Kim、Jongkook Lee、Jiyoung Chang、Sanghee Kim
DOI:10.1016/s0040-4020(00)01130-3
日期:2001.2
A total synthesis of the sesquiterpene (±)-β-elemene (1) has been achieved starting from a simple acyclic precursor 4. Key transformations include a ‘doubly diastereodifferentiating folding and allylic strain-controlled’ intramolecular ester enolate alkylation. In the course of the synthesis, we encountered remarkably different reactivity between syn and anti diastereomeric esters in the enolization
从简单的无环前体4开始,即可实现倍半萜(±)-β-榄香烯(1)的全合成。关键的转化包括“双重非对映异构折叠和烯丙基应变控制”的分子内酯烯酸酯烷基化。在合成过程中,我们在烯醇化步骤中遇到了顺式和反非对映异构酯之间的显着不同的反应性。