A silica sulfuric acid-catalyzed three-component one-pot synthesis of 1,3-diarylimidazolium tetrafluoroborates was undertaken via the reaction of aromatic amine, formaldehyde and glyoxal at room temperature in ionic liquid [BMIM][BF4] with good yields. Up to four new bonds and one new ring were formed in one-pot with water as the only by-product in the reactions. The product 4d was determined by X-ray diffraction. This work develops an efficient and low-cost preparation of 1,3-diarylimidazolium and N-heterocylic carbene.
在室温下,通过芳香胺、
甲醛和
乙二醛在
离子液体[BMIM][BF4]中的反应,以
二氧化硅硫酸为催化剂,对1,3-二芳基
咪唑鎓四
氟硼酸盐进行了三组分的一锅法合成,收率良好。在一锅法合成中,最多可形成四个新键和一个新环,反应中只有
水作为副产物。通过X射线衍射确定了产物4d。这项工作开发了一种高效且低成本的1,3-二芳基
咪唑鎓和N-杂环卡宾的制备方法。