Total synthesis of grandisine D (5) was achieved by a Brønsted acid mediated Morita−Baylis−Hillman (MBH) ring-closure reaction and stereoselective aldol condensation with (S)-5-methylcyclohexenone (9) as key steps. The MBH approach was also applicable for the construction of the aza-fused bicyclic systems of pyrrolizidine and stemona alkaloids.

中文翻译：

---

大黄素D的全合成

通过布朗斯台德酸介导的森田-贝利斯-希尔曼（MBH）闭环反应和立体选择性醛醇缩合反应（S）-5-甲基环己烯酮（9）作为关键步骤，实现了金刚烷D（5）的总合成。MBH方法也可用于吡咯烷和草醚生物碱的氮杂稠合双环系统的构建。