Photoredox‐Catalyzed Tandem Demethylation of
<i>N</i>
,
<i>N</i>
‐Dimethyl Anilines Followed by Amidation with α‐Keto or Alkynyl Carboxylic Acids
作者:Pritha Das、Hasina Mamataj Begam、Samir Kumar Bhunia、Ranjan Jana
DOI:10.1002/adsc.201900525
日期:2019.9.3
for highly selective monodemethylation of N,N‐dimethyl anilines to generate secondary amines and subsequent coupling with α‐ketocarboxylic acids or alkynyl carboxylic acids to form α‐ketoamides or alkynamides respectively under visible light photoredox catalyst in a single operation. From the deuterium‐labeling experiment, it was probed that demethylation is the slowest step in this tandem process
我们在此报告了一种仿生方法,该方法可在单个可见光光氧化还原催化剂下,在N,N-二甲基苯胺上进行高选择性单脱甲基化以生成仲胺,然后与α-酮羧酸或炔基羧酸偶联,分别形成α-酮酰胺或炔酰胺。手术。从氘标记实验可以看出,脱甲基是该串联过程中最慢的步骤。而对照实验和光谱研究表明,光氧化还原催化剂也参与了随后的酰胺化步骤。反应在室温下平稳进行,提供中等至极好的偶联产物收率。酰胺也已转化为一系列具有生物活性的螺环化合物。