<i>N</i>-Mannich Bases of Aromatic Heterocyclic Amides: Synthesis via Copper-Catalyzed Aerobic Cross-Dehydrogenative Coupling under Ambient Conditions
作者:Shailendra K. Singh、Nisha Chandna、Nidhi Jain
DOI:10.1021/acs.orglett.7b00125
日期:2017.3.17
An efficient and facile method to synthesize N-Mannich bases has been developed using an inexpensive copper(I) bromide/air catalyst system at ambient temperature. A cross-dehydrogenative coupling of N,N-dimethylarylamines occurs efficiently with aromatic heterocyclic amides (oxindoles, isatins), cyclic amides (lactams), simple amides (benzamide), as well as imides (succinimide, phthalimide) to furnish
使用廉价的溴化铜(I)/空气催化剂体系,在环境温度下,已经开发出一种高效且简便的合成N-曼尼希碱的方法。N,N-二甲基芳基胺与芳族杂环酰胺(羟吲哚,靛红),环酰胺(内酰胺),简单酰胺(苯甲酰胺)以及酰亚胺(琥珀酰亚胺,邻苯二甲酰亚胺)发生交叉脱氢偶联,以提供相应的酰胺化/酰亚胺衍生物,收率良好。初步的机理和同位素标记研究表明,该反应遵循自由基途径,并涉及亚胺离子中间体。