by the intermediacy of N-acyliminium species. A similar process applied to lactams 21b–25b affords the pyrrolizidine type compounds 26–35 through consecutive azonium-Cope rearrangement and N-acyliminium ring closure. Additional results are concerned with the use of aromatic rings as π-nucleophiles.
通过内酰胺类物种的中间作用,羧甲基内酰胺1b–3b的环化可提供高产的大环化合物4–6。应用于内酰胺21b-25b的类似过程可通过连续的偶氮鎓Cope重排和N-
嘧啶闭环得到
吡咯烷核苷类化合物26-35。其他结果涉及芳环作为π-亲核试剂的使用。