Dimerizations of 2-bromo-3-methyl-1,4-naphthoquinone and 2-methyl-1,4-naphthoquinone in tetra-n-butylammonium bromide
作者:Mai Onuki、Motohiro Ota、Shoya Otokozawa、Shogo Kamo、Shusuke Tomoshige、Kazunori Tsubaki、Kouji Kuramochi
DOI:10.1016/j.tet.2019.130899
日期:2020.2
organic solvent with an ionic solvent frequently changes the mechanism of a reaction. In this study, reactions of 2-bromo-3-methyl-1,4-naphthoquinone and 2-methyl-1,4-naphthoquinone in ionic liquids were examined. Dimerization of 2-bromo-3-methyl-1,4-naphthoquinone or 2-methyl-1,4-naphthoquinone with N-methylcyclohexylamine in tetra-n-butylammonium bromide (TBAB), an ionic liquid, under an aerobic atmosphere
2-溴-3-甲基-1,4-萘醌和2-甲基-1,4-萘醌是高反应性物种,已知其以各种方式二聚。每种化合物二聚得到的产物主要取决于所用溶剂。离子液体代表了具有非分子(离子)特性的新型溶剂。用离子溶剂代替常规有机溶剂经常改变反应机理。在这项研究中,研究了2-溴-3-甲基-1,4-萘醌和2-甲基-1,4-萘醌在离子液体中的反应。2-溴-3-甲基-1,4-萘醌或2-甲基-1,4-萘醌的二聚化用Ñ -methylcyclohexylamine在四Ñ在有氧气氛下,离子液体溴化丁基溴化铵(TBAB)分别得到5,7,12,14-戊烯酮和1-甲基KuQuinone。与先前报道的方法相比,使用TBAB作为溶剂提高了产物的产率。还研究了每个二聚化的机理。