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 allylicstrain-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