Abstract
A clean and environmentally benign route for the preparation of substituted thiazoles 4a–k via a three component reaction of an aldehyde, thiosemicarbazide and a bromoacetophenone in the presence of 3,3′-(pentane-1,5-diyl)bis(1,2-dimethyl-1H-imidazol-3-ium) bromide is reported. The present methodology offers several advantages such as solvent-free conditions, excellent yields, simple procedure, mild conditions and reduced environmental consequences. The ionic liquid can be recovered and reused. All synthesized compounds were characterized by IR, NMR and elemental analysis.
摘要:报道了一种清洁、环保的方法,通过在3,3′-(戊烷-1,5-二基)二(1,2-二甲基-1H-咪唑-3-ium)溴化物存在下,利用醛、硫脲和溴乙酰苯酮的三组分反应制备取代噻唑4a–k。该方法具有无溶剂条件、优异产率、简单操作、温和条件和减少环境影响等多种优点。离子液体可以回收和重复使用。所有合成化合物均通过红外光谱、核磁共振和元素分析进行了表征。