Pheromones; 87.<sup>1</sup>An Efficient Synthesis of (6<i>E</i>,11<i>Z</i>)-6,11-Hexadecadienyl Acetate and (6<i>E</i>,11<i>Z</i>)-6,11-Hexadecadienal: Female Sex Pheromone Components of<i>Antheraea pernyi</i>and<i>A. polyphemus</i>(Lepidoptera: Saturniidae)
作者:Hans Jürgen Bestmann、Neelakanthi E. Gunawardena
DOI:10.1055/s-1992-26348
日期:——
(6E,11Z)-Hexadecadienyl acetate (15) and the corresponding aldehyde 16, the female sex pheromone components of Antheraea pernyi and A. polyphemus (Lepidoptera; Saturniidae) have been synthesized in 32 % and 27 % overall yields, respectively, and in 99 % isomeric purity. Tetrahydropyran (1) was used as the starting material to obtain 5-bromopentanol (3) which was subsequently chain elongated to 7-(tetrahydropyran-2-yloxy)-1-heptyne (5) by the standard procedures. The organolithium compound from 5 was coupled with (Z)-1-bromo-4-nonene (11), obtained from the Wittig reaction between pentyltriphenylphosphonium bromide (9) and 4-(tetrahydropyran-2-yloxy)butanal (8) followed by bromination. The product, (Z)-1-(tetrahydropyran-2-yloxy)-11-hexadecen-6-yne (12) which resulted, was reduced with sodium/liquid ammonia to give 13 with the E-6 bond. Removal of the protecting group resulted in the desired alcohol 14 which on acetylation and oxidation gave the desired acetate 15 and the aldehyde 16, respectively.
(6E,11Z)-十六碳二烯基乙酸酯(15)和相应的醛16,作为大斑安天蚕蛾(Antheraea pernyi)和多斑安天蚕蛾(A. polyphemus)(鳞翅目;天蚕蛾科)的雌性性信息素成分,已分别以32%和27%的总产率合成,并且具有99%的异构体纯度。以四氢吡喃(1)为起始原料,通过标准程序制备出5-溴戊醇(3),随后将其链延长为7-(四氢吡喃-2-基氧)-1-庚炔(5)。5的 organolithium 化合物与(Z)-1-溴-4-壬烯(11)偶联,后者由戊基三苯基溴化膦(9)和4-(四氢吡喃-2-基氧)丁醛(8)的Wittig反应制得,随后进行溴化。所得产物(Z)-1-(四氢吡喃-2-基氧)-11-十六碳-6-炔烯(12)经钠/液氨还原,形成具有E-6键的13。去除保护基团后得到目标醇14,经乙酰化和氧化分别得到目标乙酸酯15和醛16。