Biomimetic Synthesis of Nauclea Indole Alkaloids, Naucleidinal, and 3-epi-Naucleidinal, by Stereoselective Rearrangement of Strictsamide and the Vincoside Lactam Aglycones.
Bioinspired Transformations Using Strictosidine Aglycones: Divergent Total Syntheses of Monoterpenoid Indole Alkaloids in the Early Stage of Biosynthesis
作者:Jukiya Sakamoto、Hayato Ishikawa
DOI:10.1002/chem.202104052
日期:2022.2.19
Bioinspired transformations to convert strictosidine aglycones into monoterpenoidindolealkaloids are reported. An important biosynthetic transformation mediated by β-glycosidase were replaced with a simple removal of the silyl group from designed strictosidine aglycone silyl ether derivatives. Subsequent bioinspired transformations under substrate control resulted in the concise and divergent total
naucleidinal (3), 19-epi-naucleidinal (5), strictosamide (6), and pumiloside (7)], two secoiridoids [aligenoside (8) and sweroside (9)], and vanillic acid (10) were isolated from the roots of Nauclea orientalis. The structures of all isolated compounds were elucidated from their physical properties and by spectroscopic methods as well as comparison with previous literature data. Compounds 1–5 and 8–10 were
一种新的核苷衍生物 4 以及由六种吲哚生物碱组成的九种已知化合物 [核苷 (1)、核内酯 A (2)、核苷 (3)、19-表核苷 (5)、硬皮酰胺 (6) 和 pumiloside (7) )],从 Nauclea orientalis 的根中分离出两种类环烯醚萜苷 [aligenoside (8) 和 sweroside (9)] 和香草酸 (10)。所有分离化合物的结构均通过其物理性质和光谱方法以及与先前文献数据的比较来阐明。化合物1-5和8-10为首次从该植物中分离得到。此外,还测试了分离的化合物对 HeLa 和 KB 细胞系的细胞毒性。
Biomimetic Synthesis of Nauclea Indole Alkaloids, Naucleidinal, and 3-epi-Naucleidinal, by Stereoselective Rearrangement of Strictsamide and the Vincoside Lactam Aglycones.
Based on a biogenetic consideration, a Nauclea alkaloid, naucleidinal (6), and its 3-epimer (7) were stereoselectively prepared from the aglycones of strictosamide and the vincoside lactam, and their absolute stereochemistry was confirmed.