Synthesis of<i>Aristotelia</i>-Type Alkaloids.. Part IV. Synthesis of (±)-aristoserratine
作者:Stefan Burkard、Hans-Jürg Borschberg
DOI:10.1002/hlca.19890720209
日期:1989.3.15
A convergent diastereoselective synthesis of racemic aristoserratine ((±)-24) via an intramolecular iminium-ion cyclization is described. The pivotal imine (±)-19 was prepared by condensation of the two building blocks (± )-trans-8-amino-3-(2,6-difluorobenzyloxy)-1-p-menthene ((±)-11) and N-(p-methoxybenzenesulfonyl)-3-indo-leacetaldehyde (18) which were synthesized from (±)-trans-1-p-menthene-3,8-diol
描述了通过分子内亚胺鎓离子环化的外消旋马兜铃香((±)-24)的会聚非对映选择性合成。枢轴亚胺(±)-19通过缩合两个结构单元(±)-反式-8-氨基-3-(2,6-二氟苄氧基)-1-对-薄荷烯((±)-11)和由(±)-反式-1-对-薄荷烯-3,8-二醇((±)-7)和3-吲哚乙酸合成的N-(对甲氧基苯磺酰基)-3-吲哚乙醛(18),分别。在到达目标的路线上(±)-24,已鉴定出两个以前未知的吲哚生物碱,即(±)-'抗'-hobartin-15-ol((±)-22)和(±)-'抗'-aristotelin-15-ol((±)- 23)。