Synthesis of All the Stereoisomers of 7-Methylheptadecane and 7,11-Dimethylheptadecane, the Female Sex Pheromone Components of the Spring Hemlock Looper and the Pitch Pine Looper
the stereoisomers of 7-methylheptadecane (1) and 7,11-dimethylheptadecane (2) were synthesized by starting from the enantiomers of citronellol (3) and methyl 3-hydroxy-2-methylpropanonate (8), respectively. A short synthesis of meso-7,11-dimethylheptadecane [(7R,11S)-2] was achieved starting from meso-2,6-dimethylheptanedioic acid [(2R,6S)-21]. A mixture of (S)-1 and (7R,11S)-2 is the pheromone of the
Enantioselective Synthesis of Alkyl-Branched Alkanes. Synthesis of the Stereoisomers of 7,11-Dimethylheptadecane and 7-Methylheptadecane, Components of the Pheromone of <i>Lambdina</i> Species
作者:David D. Díaz、Víctor S. Martín
DOI:10.1021/jo0055436
日期:2000.11.1
The stereoisomers of 7,11-dimethylheptadecane and 7-methylheptadecane have been synthesized. The key step used has been the intramolecular hydride transfer from a secondary gamma-benzyloxy group with defined absolute stereochemistry to a cation generated by Lewis acid treatment of the suitable tertiary Co(2)(CO)(6)-complexed propargylic alcohol. The application of this method provided stereochemically
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。