The stereospecific synthesis of the title acyclic sesquiterpene, isolated from Perilla frutscens f. viridis Makino (Japanese name, Aojiso) by the palladium-catalyzed cross-coupling of 2-(4,8-dimethyl-1,3,7-nonatrienyl)-1,3,2-benzodioxaborole with (Z)-2-bromo-2-butene, is described. The benzodioxaborole was prepared by the hydroboration of 4,8-dimethyl-3,7-nonadien-1-yne, newly prepared via three steps from geranial, with 1,3,2-benzodioxaborole.
本文描述了从紫苏(Perilla frutscens f. viridis Makino,日本名Aojiso)中分离出的标题为无环
倍半萜的立体选择性合成,该合成是通过
钯催化2-(4,8-二甲基-1,3,7-壬
三烯基)-1,3,2-苯并二氧
硼烷与
(Z)-2-溴-2-丁烯的交叉偶联反应实现的。苯并二氧
硼烷是通过4,8-二甲基-3,7-壬二烯-1-炔的氢
硼化反应制备的,该反应是通过从香叶醛到1,3,2-苯并二氧
硼烷的三个步骤新制备的。