Pheromone Synthesis, CLXXVI. Synthesis of the Four Stereoisomers of 3,13-Dimethylheptadecane, the Major Sex Pheromone Component of the Western False Hemlock Looper
作者:Hirosato Takikawa、Yasuo Shirai、Makoto Kobayashi、Kenji Mori
DOI:10.1002/jlac.199619961205
日期:1996.12
All of the fourstereoisomers of 3,13-dimethylheptadecane (1), the female-produced sexpheromone of the westernfalsehemlocklooper (Nepytia freemani), were synthesized by starting from the enatiomers of citronellol (2a) and 2-methyl-1-butanol (4a).
been synthesized in 36–50% total yield using the enantiomers of 2-methyloxiraneoxide as chiral sources. The key steps of this strategy involved CuI catalyzed ring-opening of chiral 2-methyloxiraneoxide, stereospecific inversion of secondary tosylate and Wittig coupling of the aldehyde with chiral phosphonium salt. The synthetic pheromones would be used to monitor and control this pest.
西部铁杉尺蠖是一种经济上重要的针叶树脱叶剂。使用 2-methyloxiraneoxide 的对映异构体作为手性来源,其性信息素的总收率为 36-50%。该策略的关键步骤包括 CuI 催化的手性 2-甲基环氧乙烷氧化物的开环、仲甲苯磺酸盐的立体特异性转化以及醛与手性鏻盐的 Wittig 偶联。合成信息素将用于监测和控制这种害虫。
Cyclopropane intermediates in the synthesis of chiral alcohols with methyl-branched carbon skeleton. Application in the synthesis of insect pheromones
作者:V. N. Kovalenko、I. V. Mineeva
DOI:10.1134/s1070428014070033
日期:2014.7
Asymmetric synthesis of (R)- and (S)-4-methyloctanoic acids. A new route to chiral fatty acids with remote stereocenters
The enantioselective synthesis of both enantiomers of 4-methyloctanoic acid, one major aggregation pheromone component of the rhinoceros beetles of the genus Oryctes and an important aroma compound, is described. The key step of the synthesis is based on a stereospecific alkylation with an alcohol-protected alkyl iodide using a pseudoephedrine derivative as a chiral auxiliary followed by subsequent removal of the auxiliary. Both enantiomers are obtained in excellent yields and enantioselectivities (93-94% ee). The strategy outlined allows preparation of a wide variety of enantiopure methyl-branched saturated and unsaturated tatty acids. (c) 2009 Elsevier Ltd. All rights reserved.
Synthesis of the Enantiomers of Some Methyl-branched Cuticular Hydrocarbons of the Ant, Diacamma sp.
作者:Kaoru MARUKAWA、Hirosato TAKIKAWA、Kenji MORI
DOI:10.1271/bbb.65.305
日期:2001.1
The enantiomers of 3-methylpentacosane, 3-methylheptacosane, 3-methylnonacosane, 13-methylheptacosane, and 5-methylheptacosane were synthesized by starting from the enantiomers of 2-methylbutyl bromide or citronellol. These methyl-branched alkanes are the characteristic components of the cuticular hydrocarbons of queen of the ant, Diacamma sp.