Enantioselective Total Synthesis of Batzelladine F and Definition of Its Structure
作者:Frederick Cohen、Larry E. Overman
DOI:10.1021/ja057433s
日期:2006.3.1
Batzelladine F (1) was synthesized in enantioselective and stereoselective fashion in 15 steps (longest linear sequence) and 1.7% overall yield from two readily available enantioenriched beta-hydroxy esters, methyl (R)-3-hydroxydecanoate and methyl (R)-3-hydroxybutyrate. Tethered Biginelli condensations are used to assemble both tricyclic guanidine fragments, with the second tethered Biginelli condensation
Batzelladine F (1) 以对映选择性和立体选择性方式在 15 个步骤(最长的线性序列)中合成,总产率为 1.7%,来自两种容易获得的富含对映体的 β-羟基酯,(R)-3-羟基癸酸甲酯和 (R)-3 甲酯-羟基丁酸盐。系留 Biginelli 缩合用于组装两个三环胍片段,第二个系留 Biginelli 缩合 (14 + 16 --> 17) 也用于连接胍片段。还制备了 batzelladine F, 2-4 的三种非对映异构体。使用 HPLC、旋光度和 CD 光谱的组合来区分立体异构体 1-4,证明 1 是六环海洋生物碱 batzelladine F 的正确结构。