The assigned structure of the dinoflagellate‐derived toxin belizentrin was prepared by total synthesis in form of the corresponding methyl ester for stability reasons. The successful route features an unusual solution for the preparation of a recalcitrant ylide on a C‐glycosidic segment; moreover, it involves an asymmetric hetero‐Diels–Alder reaction en route to the tertiary hemiacetal substructure
由于稳定性原因,通过全合成以相应甲酯的形式制备了源自鞭毛鞭毛贝利恩特林的毒素的指定结构。成功的途径是在C-糖苷段上制备顽固性叶立德的一种不寻常的解决方案。此外,它还涉及到第三
半缩醛亚结构的不对称杂Diels-Alder反应,两个精心构建的模块的Negishi交叉偶联以及基于
螺内酯分子内
氨解的大环化。改性的Kocienski烯烃化反应最终使多元醇侧链连接到大环上,尽管这种转化面临着这种多不饱和目标化合物的异常碱基敏感性。