A Concise, Efficient and Flexible Strategy for the Synthesis of the Pheromones of<i>Oryzaephilus</i>and<i>Cryptolestes</i>Grain Beetles
作者:Christopher D. J. Boden、John Chambers、Ian D. R. Stevens
DOI:10.1055/s-1993-25874
日期:——
Six of the seven macrolide components of the pheromone systems of grain beetles of the genera Oryzaephilus and Cryptolestes are synthesised by new routes of greatly improved efficiency. Iterative methodology based on the Wittig olefination is employed for the construction of the (Z,Z)-1,4-diene subunits in three of the lactones; chlorite oxidation of (Z)-3-alkenals derived by this methodology is used to form the (Z)-3-alkenoic acid functionalities present in four of the targets. The use of recently described conditions for the cyclisation of a Combretastatin analogue gives dramatically increased yields for the macrolactonisation steps in all six cases.
稻属和隐甲虫属的谷甲虫信息素系统的七种大环内酯成分中的六种是通过新路线合成的,效率大大提高。采用基于 Wittig 烯化的迭代方法在三个内酯中构建 (Z,Z)-1,4-二烯亚单元;通过该方法衍生的 (Z)-3-烯醛的亚氯酸盐氧化用于形成四个靶标中存在的 (Z)-3-烯酸官能团。在所有六种情况下,使用最近描述的康布他汀类似物环化条件可显着提高大内酯化步骤的产率。