The synthesis of a model endocyclic allene related to the vernonia allenes is described. Fragmentation of a suitable decalin derivative gave the simplified germacrane scaffold. Computational analysis of this and related substrates provides insight into the stereoelectronic requirements of C–C fragmentation. The overall strategy to access these and other sesquiterpenes and the key steps in the present sequence are also discussed.
描述了与维诺尼亚烯类相关的内环戊二烯模型的合成。合适的莰烷衍生物的分解产生了简化的莰烷骨架。对这些及相关底物的计算分析揭示了C-C断裂的立体电子要求。还讨论了访问这些和其他倍半萜化合物的整体策略以及当前序列中的关键步骤。