An acid-catalyzed Prins/semipinacol rearrangement cascade reaction of hydroxylated pinene derivatives that leads to tricyclic fenchone-type scaffolds in very high yields and diastereoselectivity has been developed. Quantum chemical analysis of the selectivity-determining step provides support for the existence of an extremely flat potential energy surface around the transition state structure. This transition state structure appears to be ambimodal, i.e., the fenchone-type tricyclic scaffolds are formed in preference to the competing formation of a bornyl (camphor-type) skeleton under dynamic control via a post-transition state bifurcation (PTSB).

中文翻译：

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羟基化蒎烯衍生物重排为 Fenchone 型骨架：动态控制选择性的计算证据

已经开发出羟基化蒎烯衍生物的酸催化的 Prins/semipinacol 重排级联反应，该反应以非常高的产率和非对映选择性得到三环芘酮型支架。选择性决定步骤的量子化学分析为过渡态结构周围极其平坦的势能面的存在提供了支持。这种过渡态结构似乎是双峰的，即在通过过渡态分叉 (PTSB) 的动态控制下，fenchone 型三环支架优先于竞争性形成冰片（樟脑型）骨架。