“Back‐to‐Front” Indole and Carbazole Synthesis from
<i>N,N</i>
‐Bis‐(2‐bromoallyl)amines by Combining Carbolithiation Reactions with Gold‐Catalysis
作者:Miguel A. Muñoz‐Torres、Fernando Martínez‐Lara、Marta Solas、Samuel Suárez‐Pantiga、Roberto Sanz
DOI:10.1002/adsc.202200824
日期:2022.11.8
The combination of organolithium chemistry with gold catalysis has enabled the development of a synthetic strategy for accessing polysubstituted indoles and carbazoles from readily available starting materials. This method is based on a “back-to-front” approach from ketopyrroles, generated by intramolecular carbolithiation of N,N-bis-(2-lithioallyl)amines that evolve into 3,4-bis(lithiomethyl)dihydropyrrole
有机锂化学与金催化的结合使得开发一种从容易获得的起始材料中获得多取代吲哚和咔唑的合成策略成为可能。该方法基于酮吡咯的“从后到前”方法,通过N,N-双-(2-锂硫代烯丙基)胺的分子内碳锂化生成能够反应的 3,4-双(锂硫甲基)二氢吡咯中间体与羧酸酯和 Weinreb 酰胺。这些酮吡咯已被证明是单或双(炔醇)吡咯的优良前体,在金催化下会发生苯环化反应,从而获得区域选择性取代的吲哚或咔唑。