一种利用核壳结构Fe 3 O 4 @MgO纳米催化剂通过醛、尿素和β-萘酚在K存在下的一锅缩合反应合成β-萘酚缩合1,3-恶嗪酮衍生物的熟练技术提出了 PEG-400 中的2 CO 3和 Fe 3 O 4 @MgO 纳米颗粒。该技术具有许多优点,例如高产率、不改变反应、快速响应、催化剂的可重复使用性以及简单的后处理技术。 PEG-400 是该系统研究的各种溶剂中最有效的溶剂。此外,聚乙二醇(PEG)可以增强纳米颗粒的抗氧化稳定性,提高催化剂效率。这导致了一个更加生态友好和可持续的协议。 图形概要
An efficient methodology employing copper nanoparticles for the preparation of 2-naphthol condensed 1,3-oxazinone derivatives employing one-pot condensation reaction in the presence of K2CO3 and copper nanoparticles in PEG-400 is described which offers several advantages, viz, high yields, clean reaction, short reaction times, recyclability of the catalyst and simple workup procedure. PEG-400 was found to be the best solvent out of a range of solvents examined for this scheme. Moreover, PEG could stabilize the nanoparticles from oxidation and thus could increase the catalyst efficiency by escalating the TON (Turn over Number) and TOF (Turn over Frequency) of the catalyst, making the protocol greener, eco-friendly and environmentally benign. (C) 2011 Elsevier Ltd. All rights reserved.