terminal double bond. The two routes differ in their degree of stereoselectivity. The absolute configuration originally assigned to (+)-conocarpan had previously been called into question on the basis of empirical chiroptical rules; the present chemical work confirms the need for revision, and the assigned absolute configurations of several compounds correlated with (+)-conocarpan must also be changed.
描述了
生物活性新
木脂素(-)-树果皮总合成的两种独立途径。第一个(98%ee)是基于在
苯环上进行正式的自由基环化,并涉及在6元环内约束的双键上的5-exo-trigonal闭合。第二种途径(88%ee)较短,基于芳基在侧链双键上的5-外三角环化。两种途径的立体选择性程度不同。最初分配给(+)-角果皮的绝对构型以前是根据经验的按摩学规则而受到质疑的。目前的
化学工作证实需要修订,并且还必须更改与(+)-
棕榈
果糖相关的几种化合物的绝对构型。