Synthesis of the Deuterated Sex Pheromone Components of the Grape Borer,<i>Xylotrechus pyrrhoderus</i>
作者:Ryutaro KIYOTA、Rei YAMAKAWA、Kikuo IWABUCHI、Keita HOSHINO、Tetsu ANDO
DOI:10.1271/bbb.90348
日期:2009.10.23
Adult males of the grape borer, Xylotrechus pyrrhoderus, secrete (S)-2-hydroxy-3-octanone [(S)-1] and (2S,3S)-2,3-octanediol [(2S,3S)-2] from their nota of prothoraces as sex pheromone components. Their structural similarity suggests that one of them is the biosynthetic precursor of the other component. In order to confirm the biochemical conversion, deuterated derivatives of both components were synthesized by starting from a Wittig reaction between hexanal and an ylide derived from D5-iodoethane and ending with enantiomeric resolution by chiral HPLC. The molecular ions of 1 and 2 could scarcely be detected by using a GC-MS analysis, and the labeled compounds showed similar mass spectra to the unlabeled pheromone components. However, several fragment ions, including four deuterium atoms, were observed in the mass spectra of their acetate derivatives, indicating that the conversion could be confirmed by examining a compound with the diagnostic ions after acetylation of the volatiles collected from insects treated with the labeled precursors.
葡萄二化螟(Xylotrechus pyrrhoderus)的成年雄虫会从其前胸喙中分泌(S)-2-羟基-3-辛酮[(S)-1]和(2S,3S)-2,3-辛二醇[(2S,3S)-2]作为性信息素成分。它们的结构相似性表明,其中一种是另一种成分的生物合成前体。为了证实这种生化转换,我们从己醛和从 D5-碘乙烷中提取的一种酰亚胺的维蒂希反应开始,合成了这两种成分的氚代衍生物,最后通过手性高效液相色谱法进行了对映体解析。通过气相色谱-质谱分析,几乎检测不到 1 和 2 的分子离子,标记化合物的质谱显示与未标记的信息素成分相似。不过,在其乙酸衍生物的质谱中观察到了几个片段离子,其中包括四个氘原子,这表明可以通过对从用标记前体处理过的昆虫身上收集到的挥发物进行乙酰化处理后,检查具有诊断离子的化合物来确认转化情况。