Simple and Efficient Method for the Synthesis of Highly Substituted Imidazoles Catalyzed by Benzotriazole
作者:Feng Xu、Nige Wang、Youping Tian、Gaoqiang Li
DOI:10.1002/jhet.1818
日期:2013.5
Benzotriazole is an efficient, readily available, and simple catalyst for the synthesis of 2,4,5‐trisubstituted imidazoles in high yields from 1,2‐diketones and aldehydes in the presence of NH4OAc via multi‐components reaction. The significant features of this one‐pot procedure are very simple operation, easy work‐up and purification of products.
A Rapid and Convenient Synthesis of Derivatives of Imidazoles under Microwave Irradiation
作者:Na Zhao、Yu-Lu Wang、Jin-Ye Wang
DOI:10.1002/jccs.200500078
日期:2005.6
of benzimidazoles and trisubstituted imidazoles was developed. Three benzimidazoles were obtained as a result of the condensation of 1,2-phenylenediamine with carboxylic acids and acetoaceticester without catalyst. A series of trisubstituted imidazoles were synthesized by condensation of benzil, aromatic aldehyde and ammonium acetate in the presence of glacial acetic acid.
Bredereck et al., Chemische Berichte, 1959, vol. 92, p. 329,335
作者:Bredereck et al.
DOI:——
日期:——
US4431722A
申请人:——
公开号:US4431722A
公开(公告)日:1984-02-14
Synthesis of 2,4,5-trisubstituted imidazoles, quinoxalines and 1,5-benzodiazepines over an eco-friendly and highly efficient ZrO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> catalyst
作者:N. Thimmaraju、S. Z. Mohamed Shamshuddin
DOI:10.1039/c6ra13956f
日期:——
ZrO2–Al2O3 at moderate temperature (80 °C) for the reaction time of 20–40 min in presence of ethanol as a solvent. The present method is experimentally simple, non-toxic and involves inexpensive reagents, clean reaction pathways and an eco-friendly catalyst. The catalytic materials used can be easily separated from the reaction mixture and reused for several reaction cycles without much loss of catalytic activity
通过固溶燃烧,浸渍和沉淀法制备了含有80mol%ZrO 2的ZrO 2 -Al 2 O 3。制备的所有催化材料均经PXRD,NH 3 -TPD,N 2表征。吸附等温线,FTIR,TEM,SEM,EDAX和ICP-OES技术。这些催化材料用于在无溶剂条件下,中等温度,较短的反应时间(20分钟)内快速,简单,通用和有效地合成2,4,5-三取代的咪唑。这是通过苯甲酰,醛和乙酸铵的三组分环缩合实现的,产率很高。通过在ZrO 2 -Al 2 O 3上分别将1,2-二胺与α-二酮环环化和羰基化合物与O-苯二胺环化,可以有效地合成喹喔啉和1,5-苯并二氮杂卓的衍生物。在中度温度(80°C)下,在有乙醇作为溶剂的情况下,反应时间为20–40分钟。本方法在实验上是简单的,无毒的,并且涉及廉价的试剂,清洁的反应路径和生态友好的催化剂。所使用的催化材料可以很容易地从反应混合物中分离出来,并重复使用几个反应周期,而不会损失太多的催化活性。