Rugosiformisin A 的分离和仿生全合成,一种来自 Isodon rugosiformis 的骨架重排松香烷型二萜
摘要:
Rugosiformisin A 是一种骨架重排的松香型二萜类化合物,具有螺[4.5]癸烷基序,是从Isodon rugosiformis中分离出来的。通过核磁共振光谱分析和单晶 X 射线衍射明确确定了其结构。在 15 个步骤中实现了 rugosiformisin A 的仿生不对称合成,总收率为 2.7%。该合成具有铱催化的不对称多烯环化和半频哪醇重排的特点。
A highly enantioselective polycyclization method has been developed using the combination of Lewis acid activation with iridium-catalyzed allylic substitution. This strategy relies on direct use of branched, racemic allylic alcohols and furnishes a diverse and unique set of carbo- and heteropolycyclic ring systems in good yields and >= 99% ee.