3-indolylnaphthoquinones with amines, such as various (hetero)aromaticamine and aliphatic amine via t-BuOK-mediated oxidative coupling at room temperature has been developed. This reaction provides efficient access to the biologically important and synthetically useful 2-amino-1,4-naphthoquinones and 2-amino-3-indolylnaphthoquinones with good yields undermildconditions. The present protocol is simple
1,4-萘醌和相关的 3-吲哚基萘醌与胺(例如各种(杂)芳香胺和脂肪胺)在室温下通过 t -BuOK 介导的氧化偶联进行无过渡金属胺化。该反应可以在温和条件下以良好的收率有效地获得具有重要生物学意义和合成用途的2-氨基-1,4-萘醌和2-氨基-3-吲哚基萘醌。本方案简单实用,具有良好的官能团耐受性。此外,将所得2-氨基-3-吲哚基萘醌进一步转化合成多环N-杂环。
Visible‐Light‐Mediated Self‐Sensitized Oxidative and Regioselective C(sp
<sup>2</sup>
)−H Selenylation and Sulfenylation of Substituted 2‐Amino‐1,4‐Naphthoquinones
作者:Nayana Nayek、Goutam Brahmachari
DOI:10.1002/ejoc.202201343
日期:2023.1.10
AbstractA photochemical method based on visible‐light (white LEDs/sunlight) irradiation has been developed for the regioselective and oxidative C(sp2)−H selenylation and sulfenylation of substituted 2‐amino‐1,4‐naphthoquinones under oxygen atmosphere. The photochemical process does not require any external photoredox catalysts. The other notable advantages of this protocol are metal‐free synthesis, visible light/sunlight as energy sources, good substrate scope, and moderate to good yields (41–91 %) with high regioselectivity.
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