Résumé A deep eutectic solvent was used as a dual catalyst and reaction medium for the efficient N-formylation of aromatic amines without hazardous organic solvent and catalyst. Treatment of aromatic amines with trimethyl orthoformate and formic acid in deep eutectic solvent at 70 °C gives the corresponding N-formyl derivatives in good to excellent yields. This simple ammonium deep eutectic solvent, easily synthesized from choline chloride and SnCl2, with 100% atom economy and making it applicable to industry and laboratory. Furthermore, heating the trimethyl orthoformate and aromatic primary amines in the deep eutectic solvent results in formation of the corresponding N,N’-diarylamidines in high yields.
摘要 采用深共晶溶剂作为双重催化剂和反应介质,在不使用有害有机溶剂和催化剂的情况下高效地对芳香胺进行 N-甲酰化反应。芳香胺与
原甲酸三甲酯和
甲酸在 70 ℃ 的深共晶溶剂中进行处理,可以得到相应的 N-甲酰基衍
生物,收率良好甚至极佳。这种简单的
铵深共晶溶剂,很容易从
氯化胆碱和
氯化锡中合成,具有 100% 的原子经济性,适用于工业和实验室。此外,在深共晶溶剂中加热
原甲酸三甲酯和芳香族
伯胺,可以高产率生成相应的 N,N'-二芳基酰胺。