An eco-friendly synthesis of 2-pyrazoline derivatives catalysed by $$\hbox {CeCl}_{3} \cdot 7\hbox {H}_{2}\hbox {O}$$ CeCl 3 · 7 H 2 O
作者:Prabhat Bhat、Gomathi Shridhar、Savita Ladage、Lakshmy Ravishankar
DOI:10.1007/s12039-017-1327-x
日期:2017.9
1,3,5-triaryl-2-pyrazolines is described. The solvent ethyl lactate, obtained from renewable sources, is biodegradable. The catalyst \(\hbox CeCl}_3} \cdot 7\hbox H}_2}\hbox O}\) is a water-tolerant Lewis acid with low toxicity. Easy and clean work up, recyclable solvent and catalyst are merits of the protocol. The reaction works well for all systems giving good yields of the desired products.
摘要以七水合氯化铈为催化剂,通过查尔酮与苯肼的缩合反应合成了1,3,5-三芳基-2-吡唑啉衍生物。所有这些反应均在作为绿色溶剂的乳酸乙酯(70%)中进行。简便,高效的后处理,溶剂和催化剂的可循环利用性是该协议的主要优点。 图形概要:概要描述了一种用于合成1,3,5-三芳基-2-吡唑啉的简便方案。从可再生来源获得的溶剂乳酸乙酯是可生物降解的。催化剂\(\ hbox CeCl} _ 3} \ cdot 7 \ hbox H} _ 2} \ hbox O} \)是具有低毒性的耐水路易斯酸。易于清洁,可循环使用的溶剂和催化剂是该协议的优点。该反应在所有系统上均能很好地发挥作用,从而获得所需产物的良好收率。