Synthesis of Alkaloids of<i>Galipea officinalis</i>by Alkylation of an α-Amino Nitrile
作者:Saurabh Shahane、Fadila Louafi、Julie Moreau、Jean-Pierre Hurvois、Jean-Luc Renaud、Pierre van de Weghe、Thierry Roisnel
DOI:10.1002/ejoc.200800512
日期:2008.9
A new synthetic approach directed towards the synthesis of naturally occurring 2-alkyl-tetrahydroquinolines is described. The C–C bonds in the α position relative to the nitrogen atom were formed by the reversal of the polarity of the C=N bond of α-amino nitrile 6, which was prepared electrochemically from 1-(phenylethyl)-tetrahydroquinoline. A NaBH4-mediated reductive decyanation process furnished
描述了一种新的合成方法,用于合成天然存在的 2-烷基-四氢喹啉。相对于氮原子在 α 位的 C-C 键是通过将 α-氨基腈 6 的 C=N 键的极性反转而形成的,它是由 1-(苯乙基)-四氢喹啉电化学制备的。NaBH4 介导的还原脱氰过程提供苄胺 16a-d 作为非对映异构体的混合物 (50-60 % de)。这些胺的催化氢解在珀尔曼催化剂的存在下进行,得到四氢喹啉 17a-d,产率范围为 70% 到 95%。游离氮原子的甲基化以 70-90% 的产率得到标题化合物 1-4。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)