Biomimetic total synthesis of (−)-erinacine E (1) has been achieved starting from the enantiopure key intermediate, which was prepared via the convergent approach developed by us. The crucial step in this synthesis is an intramolecular aldol reaction driven by the 1,2-migration of a benzoyl group within a compound that was rationally designed to prevent the retro-aldol reaction, thereby successfully
(-)-erinacine E (1) 的仿生全合成已经从对映体纯的关键中间体开始,这是通过我们开发的收敛方法制备的。该合成中的关键步骤是由化合物内苯甲酰基的 1,2-迁移驱动的分子内醛醇反应,该反应经过合理设计以防止反醛醇反应,从而成功提供 1 的应变骨架。在推定的生物合成中间体纹状体 A 中,由 C4' 乙酰基驱动的分子内醛醇反应可能参与 1 的生物合成。这种酰基迁移闭环反应可用于合成其他应变分子。
Enantioselective Total Synthesis of (−)-Erinacine B
The first enantioselective total synthesis of (-)-erinacine B has been achieved. Our approach features convergent construction of the 5-6-7 tricyclic cyathane core system viachiral building blocks prepared using asymmetric catalysis developed by us and highly stereoselective construction of all stereogenic centers in the aglycon. [reaction: see text].