Brønsted Acidic Ionic Liquid Accelerated Halogenation of Organic Compounds with N-Halosuccinimides (NXS)
作者:Dejan Vražič、Marjan Jereb、Kenneth Laali、Stojan Stavber
DOI:10.3390/molecules18010074
日期:——
N-halosuccinimides (NXS) under mild conditions with short reaction times. Methyl aryl ketones were converted into α-halo and α,α-dihaloketones, depending on the quantity of NXS used. Ketones with activated aromatic rings were selectively halogenated, however in some cases mixtures of α-halogenated ketone and ring-halogenated ketones were obtained. Activated aromatics were regioselectively ring halogenated
布朗斯台德酸性离子液体 1-甲基-3-(4-磺丁基)咪唑鎓三氟甲磺酸盐 [BMIM(SO(3)H)][OTf] 被证明可有效用作溶剂和催化剂,用于活化有机化合物与 N 的卤化-卤代琥珀酰亚胺 (NXS) 在温和条件下反应时间短。甲基芳基酮转化为 α-卤代酮和 α,α-二卤代酮,这取决于所用 NXS 的数量。具有活化芳环的酮被选择性卤化,但在某些情况下,会得到 α-卤化酮和环卤化酮的混合物。活化的芳烃被区域选择性环卤化以得到单和二卤取代的产物。[BMIM(SO(3)H)][OTf] 离子液体 (IL-A) 在代表性的单卤化反应中成功重复使用八次,效率没有明显降低。还介绍了该 IL 中有效的卤化放大。反应性趋势和观察到的化学和区域选择性表明这些 IL 促进的卤代官能化反应中存在 ET 过程。