(4E)-Dehydrocitrals [(2E,4E)- and (2Z,4E)-3,7-dimethyl-2,4,6-octatrienals] from Acarid Mite Histiogaster sp. A096 (Acari: Acaridae)
作者:Hiroyuki HIRAOKA、Naoki MORI、Ritsuo NISHIDA、Yasumasa KUWAHARA
DOI:10.1271/bbb.65.2749
日期:2001.1
A mixture of two monoterpenes was obtained as the opisthonotal gland secretion from unidentified Histiogaster sp. A096 (Acari: Acaridae), and their structures were elucidated to be (4E)-dehydrocitrals[(2E,4E)- and (2Z,4E)-3,7-dimethyl-2,4,6-octatrienals] by GC/MS, GC/FT-IR, UV and 1H-NMR spectra. Both isomers of (4E)-dehydrocitral prepared by syntheses in 4 steps from 3-methyl-2-butenal with 34.2% yields (based on the ylide) were separated by column chromatography into the (2E,4E)- and (2Z,4E)-3,7-dimethyl-2,4,6-octatrienal. Mass spectra together with GC retention times of the purified natural (4E)-dehydrocitrals were identical with those of synthetic (2E,4E)-3,7-dimethyl-2,4,6-octatrienal and (2Z,4E)-3,7-dimethyl-2,4,6-octatrienal. The geometry at the 2-C position of both synthetic (4E)-dehydrocitrals was confirmed by NOESY analyses. This is the first identification of (4E)-dehydrocitrals from the animal kingdom.
从未鉴定的Histiogaster sp. A096(蜱目:蜱科)获得的后背腺分泌物中得到了一种混合的双萜烯,其结构通过气相色谱-质谱(GC/MS)、气相色谱-傅里叶变换红外光谱(GC/FT-IR)、紫外光谱(UV)和氢核磁共振谱(1H-NMR)被阐明为(4E)-去氢柠檬醛[(2E,4E)-和(2Z,4E)-3,7-二甲基-2,4,6-辛三烯醛]。这两种(4E)-去氢柠檬醛的异构体通过四步从3-甲基-2-丁醛合成,产率为34.2%(基于超烯),并通过柱色谱分离为(2E,4E)-和(2Z,4E)-3,7-二甲基-2,4,6-辛三烯醛。纯化后的天然(4E)-去氢柠檬醛的质谱及其气相色谱保留时间与合成的(2E,4E)-3,7-二甲基-2,4,6-辛三烯醛和(2Z,4E)-3,7-二甲基-2,4,6-辛三烯醛相同。通过NOESY分析确认了两种合成(4E)-去氢柠檬醛在2-C位的几何构型。这是首次在动物界中鉴定出(4E)-去氢柠檬醛。