Stereoselective synthesis of <i>trans</i>-fused iridoid lactones and their identification in the parasitoid wasp <i>Alloxysta victrix</i>, Part I: Dihydronepetalactones
作者:Nicole Zimmermann、Robert Hilgraf、Lutz Lehmann、Daniel Ibarra、Wittko Francke
DOI:10.3762/bjoc.8.140
日期:——
also be used for the synthesis of enantiomerically pure trans-fused iridomyrmecins. Using synthetic reference samples, the combination of enantioselective gas chromatography and mass spectrometry revealed that volatiles released by the endohyperparasitoid wasp Alloxysta victrix contain the enantiomerically pure trans-fused (4R,4aR,7R,7aS)-dihydronepetalactone as a minor component, showing an unusual
从柠檬烯的对映异构体开始,合成了反式稠合二氢荆芥内酯的所有八种立体异构体。关键化合物是 1-乙酰氧基甲基-2-甲基-5-(2-羟基-1-甲基乙基)-1-环戊烯的纯立体异构体。柠檬烯的立体中心保留在目标化合物的 4a 位,并用于在合成过程中立体选择性地控制其他手性中心的引入。基本上,这种方法也可用于合成对映异构纯的转融合 iridomyrmecins。使用合成参考样品,对映选择性气相色谱法和质谱法的组合表明,内寄生蜂 Alloxysta victrix 释放的挥发物含有对映体纯反式融合 (4R,4aR,7R,7aS)-二氢荆芥内酯作为次要成分,