A series of N,N′-asymmetrically substituted imidazolium iodide salts have been synthesized, starting from N-arylimidazoles and the less expensive, but less reactive, 1-chlorobutane or (3-chloropropyl)trimethoxysilane. The addition of potassium iodide and the use of 1,2-dimethoxyethane as a solvent lead to multigram quantities of these salts becoming readily available, in yields ranging from 50% to 94%. Direct combination of (3-chloropropyl)trimethoxysilane with 1-mesityl-1H-imidazole was also effected, in good yield, by using a microwave oven at 180 ËC. The synthesis of two 1-alkyl-3-isopropylimidazolium chlorides is also presented herein.
一系列N,N′-非对称取代的
咪唑碘盐已被合成,合成原料是通过N-芳基
咪唑和较为廉价但反应活性较低的1-
氯丁烷或(3-
氯丙基)
三甲氧基硅烷来实现。添加
碘化钾并使用1,2-
二甲氧基乙烷作为溶剂,使得这些盐类以50%到94%的产率稳定地获得,数量可达克级。此外,还通过在180℃下使用微波炉,高效地实现了(3-
氯丙基)
三甲氧基硅烷与1-2-甲基-
1H-咪唑的直接反应。本文还介绍了两种1-烷基-3-异丙基
咪唑氯化物的合成方法。