An iterating two-step ring extension process including indolisation–oxidation by ozone applied to an eight membered cyclanone allowed the preparation of seven compounds with ring sizes ranging from 10 to 16. The structure of all derivatives were assigned by spectroscopic data, particularly by 1H and 13C NMR, COSY, HMBC and HMQC experiments.
重复的两步扩环过程(包括对八元环酮应用臭氧进行的吲哚化-氧化)使得可以制备7种化合物,其环大小为10至16。所有衍生物的结构均由光谱数据确定,尤其是1 H和13 C NMR,COSY,HMBC和HMQC实验。