that orients pseudoequatorially to the benzylamine group placed at the C-3 position. In addition, an unusual β-fragmentation of a primary alkoxyl radical generated from its corresponding N-phthalimide derivative was achieved, and thus taking advantages of both reactions, the total synthesis of 2-epi-(−)-jaspine B was completed.
据报道,在3-
氨基-3-脱氧
核糖呋喃糖衍
生物的异头位置的亲核取代中具有高的逆立体选择性。这种空前的立体选择性是根据对五元环氧碳鎓离子的“内侧面”的优先亲核攻击来解释的,该五元环氧碳鎓离子伪伪地与位于C-3位置的
苄胺基团取向。另外,获得了由其相应的N-邻苯二甲
酰亚胺衍
生物产生的伯烷氧基的不寻常的β-片段化,因此利用这两个反应的优势,完成了2- epi -(-)-jaspine B的全合成。