A Flexible Approach to Grandisine Alkaloids: Total Synthesis of Grandisines B, D, and F

被引:28
作者
Kurasaki, Haruaki [2 ]
Okamoto, Iwao [1 ]
Morita, Nobuyoshi [1 ]
Tamura, Osamu [1 ]
机构
[1] Showa Pharmaceut Univ, Tokyo 1948543, Japan
[2] Kyorin Pharmaceut Co Ltd, Exploratory Res Labs, Nogi, Tochigi 3290114, Japan
关键词
alkaloids; natural products; nitrogen heterocycles; total synthesis; RECEPTOR-BINDING AFFINITY; INDOLIZIDINE ALKALOIDS; ABSOLUTE-CONFIGURATION; ASYMMETRIC-SYNTHESIS; ACYLIMINIUM IONS; IMINIUM ION; LEAVES; ACID; CYCLIZATIONS; VINYLSILANES;
D O I
10.1002/chem.200901843
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
This article describes in detail the first total synthesis of grandisine alkaloids, grandisines B, D, and F, which show affinity for the human delta-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 Bronsted acid mediated Morita-Baylis-Hillman (MBH) reaction via the N-acyl iminium ion.
引用
收藏
页码:12754 / 12763
页数:10
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