This article describes in detail the first total synthesis of grandisine alkaloids, grandisines B, D, and F, which show affinity for the human δ‐opioid receptor. The key steps in this synthesis are construction of the isoquinuclidinone moiety of 2 by intramolecular imine formation and the tetracyclic ring system of 4 by stereoselective ring closure of the enolate of amine 8 generated by 1,4‐addition of ammonia to 9. Synthesis of key intermediate 9 featured a highly stereoselective Brønsted acid mediated Morita–Baylis–Hillman (MBH) reaction via the N‐acyl iminium ion.

中文翻译：

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灵活的大地碱生物碱方法：大地碱B，D和F的全合成

本文详细介绍了金丝雀碱生物碱，金丝雀碱B，D和F的第一种全合成方法，它们对人的δ阿片受体具有亲和力。该合成的关键步骤是通过分子内亚胺的形成来构建2的异奎宁环酮部分，并通过将1，4加成氨到9生成的胺8的烯醇的立体选择性闭环来构建4的四环体系。关键中间体9的合成具有通过N-酰基亚胺离子高度立体选择性的布朗斯台德酸介导的森田-贝利斯-希尔曼（MBH）反应。