Sex Pheromone of pine sawflies. Chiral syntheses of some active minor components isolated from neodiprion sertifer and of some chiral analogues of diprionyl acetate.
some analogues, 2 – 7, of 3,7-dimethyl-2-pentadecanol, 1 (diprionol), and of the corresponding acetates are described. The acetate of 1 is the main attractant in the sexpheromone of the Neodiprion genus (Diprionidae). Compounds 2 /2- 4 were identified as minor components isolated from females of Neodiprion sertifer. Synthetic intermediates were prepared either from chiral starting materials, via asymmetric
Chiral synthesis of (2s,3s,7s)-3,7-dimethylpentadecan-2-yl acetate and propionate, potential sex pheromone components of the pine saw-fly neodiprion sertifer (geoff.)
A synthesis of (2S,3S,7S)-3,7-dimethylpentadecan-2-yl acetate () and propionate () is described. (2S)-2-Methyldecan-1-yl lithium () was reacted with (3S,4S)-3,4-dimethyl-γ-butyrolactone () to yield the ketoalcohol which upon Huang-Minlon reduction furnished (2S,3S,7S)-3,7-dimethylpentadecan-2-ol (). Acylations gave the esters and . The (2S)-2-methyldecan-1-yl lithium was obtained via asymmetric synthesis
Synthesis and gas chromatographic separation of the eight stereoisomers of diprionol and their acetates, components of the sex pheromone of pine sawflies
The present report describes syntheses of the eight possible stereoisomers of 3,7-dimediyl-2-pentadecanol 1, and the corresponding acetates. The latter are components of the sexpheromone of the Neodiprion, Diprion and Gilpinia genera (Diprionidae). Synthetic intermediates were prepared from either chiral starting materials or by asymmetricsyntheses. The stereochemical compositions of the isomeric
Lyonetia prunifoliella is a significant pest in orchards and damages apple. The sexpheromones of this pest were prepared via a new and concise method. The central to our method were Evans' chiral auxiliaries, the addition of chiral Grignard reagent to aldehyde and Wittig coupling.
Lyonetia prunifoliell a 是果园的重要害虫,为害苹果。这种害虫的性信息素是通过一种新的、简洁的方法制备的。我们方法的核心是 Evans 的手性助剂,将手性格氏试剂添加到醛和 Wittig 偶联中。
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作者:W. Francke、E. Plass、N. Zimmermann、H. Tietgen、T. Tolasch、S. Franke、M. Subchev、T. Toshova、J. A. Pickett、L. J. Wadhams、C. M. Woodcock
DOI:10.1023/a:1005475725742
日期:——
The major component of the female-produced sex pheromone of Scoliopteryx libatrix has been characterized by chemical analysis, synthesis, electrophysiological studies and field tests as (6Z,13)-methylheneicosene, probably the 13S-isomer. This is the first example of a branched chain alkene as a sex pheromone in the Noctuidae and is markedly different from the pheromones of other members of the family. The systematic position of S. libatrix, belonging to a monotypic genus of a one-member subfamily within the Noctuidae, may reflect the unusual structure of the sex pheromone.