Role of lactam vs. lactim tautomers in 2(1H )-pyridone catalysis of aromatic nucleophilic substitution
作者:Anne Loppinet-Serani、Florence Charbonnier、Christian Rolando、Ivan Huc
DOI:10.1039/a706533g
日期:——
3-Ethylaminocarbonyl-2(1H)-pyridone 1 and 3-ethoxycarbonyl-2(1H)-pyridone 2 have been synthesised and tested as catalysts for the aromatic nucleophilic substitution of fluoride by piperidine in 2-fluoro-5-nitrobenzonitrile 3. A kinetic model which takes into account the dimerisation of the catalysts has been developed, which allows a quantitative analysis of measured data. 3-Ethylaminocarbonyl-2(1H)-pyridone 1 exists
合成了3-乙基氨基羰基-2(1 H)-吡啶酮1和3-乙氧基羰基-2(1 H)-吡啶酮2并作为2-氟-5-硝基苄腈3中哌啶对氟进行芳族亲核取代的催化剂进行了测试。已经开发了考虑催化剂二聚作用的动力学模型,其允许对测量数据进行定量分析。3-乙基氨基羰基-2(1 H)-吡啶酮1仅以内酰胺互变异构体形式存在,可以是单体或二聚体,但3-乙氧基羰基-2(1 H)-吡啶酮2作为内酰胺单体存在,而其二聚体以内酰胺形式存在。尽管存在这些差异,这两种化合物对于所研究的反应仍显示出相似的催化效率,这表明内酰胺和内酰胺互变异构体在互变异构催化方面具有可比的效率。