作者:Jérôme Cassayre、Samir Z. Zard
DOI:10.1055/s-1999-2621
日期:1999.4
A short synthesis of (±)-γ-lycorane 6 is described using two different radical cyclisations. The key step is the formation of tetrahydroindolone 9 by a nickel-promoted 5-endo radical cyclisation. This is followed by a tributylstannane-mediated 6-endo ring closure to the tetracyclic lactam 10 which is readily reduced to (±)-γ-lycorane 6.
本文介绍了利用两种不同的自由基环化方法简短合成 (±)-δ-lycorane 6 的过程。关键步骤是通过镍促进的 5-endo 自由基环化形成四氢吲哚酮 9。随后,由三丁基锡烷介导的 6-内环闭合生成四环内酰胺 10,并很容易还原成 (±)-δ-lycorane 6。