A convergent, general synthesis of (2E,4E)-4,6,10,12-tetramethyltrideca-2,4-dien-7-one (matsuone, 1) and five closely related analogs (2–6), which serve as sex pheromone components of female Matsucoccus pine scales, is described. The aldehydes 8a and 8b were obtained via a reaction sequence in which the key step is a [2,3]-Wittig sigmatropicrearrangement of the oxazoline ether of bisallylic tertiary
The diastereoselective [2,3]-Wittig rearrangement of a tertiary bisallylic ether (8) is described. The stereochemical outcomes for rearranged products were determined. The effects of reaction conditions on selectivities were investigated. Matsuccocus female sex pheromones 1–3 were efficiently synthesized via this rearrangement.
Concise Synthesis of a Racemic and Diastereomeric Mixture of the Sex Pheromones of<i>Matsucoccus</i>Pine Scales
作者:Hidenori Watanabe、Takeru Watanabe、Takeshi Kitahara、Kenji Mori
DOI:10.1271/bbb.61.127
日期:1997.1
A short (3–5 steps) synthesis of a racemic and diastereomeric mixture of Matsucoccus sex pheromones (1–3) is described. The key reaction is Lewis acid-mediated cyanation of symmetric tertiary alcohol 6 to afford common intermediate 7.