Pheromone Synthesis, CCVIII: Synthesis of (1S,3S,7R)-3-Methyl-α-himachalene, the Sex Pheromone of the Sandfly Lutzomyia longipalpis from Jacobina, Brazil
作者:Takuya Tashiro、Masahiko Bando、Kenji Mori
DOI:10.1055/s-2000-8220
日期:——
(1S,3S,7R)-3-Methyl-α-himachalene, the sex pheromone of the male sandfly (Lutzomyia longipalpis) from Jacobina, Brazil, was synthesized enantioselectively by employing Evan's or Oppolzer's asymmetric methylation and intramolecular Diels-Alder reaction as the two key steps. The absolute configuration of the product was unambiguously established by X-ray analysis of a compound related to one of the synthetic intermediates. The ring junction of this sandfly pheromone possesses the absolute configuration opposite to that of the known (1R,7R)-α-himachalene of plant origin.
(通过采用 Evan 或 Oppolzer 的不对称甲基化和分子内 Diels-Alder 反应这两个关键步骤,对映体选择性地合成了 (1S,3S,7R)-3-甲基-δ-himachalene,它是巴西雅各比纳雄性沙蝇(Lutzomyia longipalpis)的性信息素。通过对与合成中间体之一相关的化合物进行 X 射线分析,明确确定了产物的绝对构型。这种沙蝇信息素的环结具有与已知植物来源的(1R,7R)-δ-himachalene相反的绝对构型。