longest linear sequence of 15 steps. Central to the synthetic approach was an efficient copper-mediated Ullmann coupling/Claisen rearrangement sequence allowing for both ipso and ortho functionalization of aromatic iodide 4. This sequence was used for the synthesis of the aromatic core. The synthetic utility of copper-catalyzed coupling reactions was further demonstrated to install the enamide with
15元环环肽
生物碱Asssenine A 1的首次全合成已通过15个步骤的最长线性序列完成。合成方法的核心是有效的
铜介导的Ullmann偶联/ Claisen重排序列,可同时对芳香族
碘化物4进行ipso和邻位官能化。该序列用于芳族核的合成。进一步证明了
铜催化的偶联反应的合成效用,以从无环α-酰胺基-ω-
乙烯基碘化物13开始的伴随的直接大环化安装烯酰胺。