A synthesis of methyl (1 R,2 R,4 S)-2-[( E)-2-iodovinyl]-4-(methoxymethoxy)cyclopentanecarboxylate is described in nine steps from a prochiral anhydride. A desymmetrization reaction followed by an epimerization and a Takai reaction are the key steps of the transformation. Based on previous work, this vinylic iodide product should be a useful precursor for the synthesis of brefeldin A and analogues.
(1 R,2 R,4 S)-2-[(E)-2-碘乙烯基]-4-(甲氧基甲氧基)环戊烷羧酸甲酯的合成描述了从前手性酸酐的九个步骤。去对称化反应、差向异构化和 Takai 反应是转化的关键步骤。根据以前的工作,这种乙烯基碘产品应该是合成布雷菲尔德菌素 A 和类似物的有用前体。
Total Synthesis of (+)-Brefeldin C, (+)-nor-Me Brefeldin A and (+)-4-<i>epi</i>-nor-Me Brefeldin A
A totalsynthesis of (+)-brefeldin C (BFC) and two brefeldin A (BFA) analogues - (+)-nor-Me BFA and (+)-4-epi-nor-Me BFA - has been developed. Key features of the syntheses include desymmetrization of meso anhydrides, a Carreira reaction to control the absolute configuration at C4 of BFC, a Suzuki-Miyaura cross-coupling reaction to create the C11-C12 bond and a Yamaguchi reaction to form the 13-membered
(+)-brefeldin C (BFC) 和两种 brefeldin A (BFA) 类似物 - (+)-nor-Me BFA 和 (+)-4-epi-nor-Me BFA - 的全合成已经开发出来。合成的关键特征包括内消旋酐的去对称化、控制 BFC C4 绝对构型的 Carreira 反应、产生 C11-C12 键的 Suzuki-Miyaura 交叉偶联反应和形成 13 元内酯的 Yamaguchi 反应戒指。