Synthesis of<i>Aristotelia</i>-type alkaloids. Part V. Biomimetic synthesis of (±)-aristomakine and (±)-aristomakinine
作者:Stefan Burkard、Hans-Jürg Borsehberg
DOI:10.1002/hlca.19900730209
日期:1990.3.14
Biomimetic syntheses of racemic aristomakinine ((±)-3) and aristomakine ((±)-4), an unusual indole alkaloid bearing an N-isopropyl group, are described. The key step is a Grob-type fragmentation of anti-15-aristotelinyl methanesulfonate ((±)-2) to the intermediate iminium ion I which, upon subsequent hydrolysis, furnished aristomakinine ((±)-3). On the other hand, the same intermediate could be reduced
描述了外消旋的阿司他金((±)-3)和马兜铃碱((±)-4)的仿生合成,这是一种不寻常的带有N-异丙基的吲哚生物碱。关键步骤是将抗-15-马兜铃烷基甲磺酸盐((±)-2)生成亚胺基离子I的Grob型断裂,该亚胺基离子I在随后水解后提供了阿司他敏((±)-3)。另一方面,相同的中间体可以原位还原为马兜铃碱((±)-4)。通过NOE差异实验已牢固确立了这两种生物碱的有争议的相对构型。