Guanidine Hydrochloride: A Highly Efficient Organocatalyst for the Synthesis of 12-Aryl-8,9,10,12-tetrahydrobenzo[<i>a</i>]xanthene-11-ones Under Solvent-Free Conditions
A new green protocol has been developed for the synthesis of 12‐aryl‐8,9,10,12‐tetrahydrobenzo[a]xanthen‐11‐ones using guanidine hydrochloride as an organocatalyst under solvent‐free conditions. Operational simplicity, mild reaction conditions, enhanced rates, high isolated yields of the pure products, and purification of products by nonchromatographic methods are significant advantages of the protocol
已开发出一种新的绿色方案,用于在无溶剂条件下使用盐酸胍作为有机催化剂合成12-芳基-8,9,10,12-四氢苯并[ a ]黄酮-11-酮。操作简便,温和的反应条件,提高的速率,纯产物的高分离产率以及通过非色谱法纯化产物是此处提出的方案的重要优点。
Rapid and Efficient One-Pot Green Synthesis of 12-Aryl-8,9,10,12-tetrahydrobenzo[<i>a</i>]xanthene-11-ones Using Zr-MCM-41 Catalyst
作者:Abolfazl Olyaei、Mona Ghodrat Alidoust
DOI:10.1080/00397911.2014.958784
日期:2015.1.2
Abstract A new green protocol has been developed for the synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-ones via a three-component, one-pot condensation reaction of dimedone, naphthols, and aromatic aldehydes using Zr-MCM-41 nanoreactors as a reusable and novel catalyst at 80 °C under solvent-free conditions. Various aromatic aldehydes containing electron-withdrawing and electron-donating
摘要 开发了一种新的绿色方案,用于通过二甲酮、萘酚和萘酚的三组分一锅缩合反应合成 12-芳基-8,9,10,12-四氢苯并[a]xanthen-11-ones。在无溶剂条件下,在 80 °C 下使用 Zr-MCM-41 纳米反应器作为可重复使用的新型催化剂制备芳香醛。在邻位、间位或对位含有吸电子和给电子取代基的各种芳族醛显示出相同的产物形成效率,产率从好到极好。操作简单、反应条件温和、速率提高、环境友好、纯产品的高分离产率以及通过非色谱方法纯化产品是此处介绍的协议的显着优势。催化剂可以回收再利用,而不会显着降低其活性。图形概要
Ammonium Chloride–Catalyzed One-Pot Synthesis of Tetrahydrobenzo[α]xanthen-11-one Derivatives Under Solvent-Free Conditions
作者:Naser Foroughifar、Akbar Mobinikhaledi、Hassan Moghanian、Reza Mozafari、Hamid R. M. Esfahani
DOI:10.1080/00397911.2010.515340
日期:2011.9.15
A one-pot, multicomponent reaction of aldehydes, dimedone, and beta-naphthols is described for the preparation of 12-aryl- or 12-alkyl-8,9,10,12-tetrahydrobenzo[alpha]xanthen-11-one derivatives using ammonium chloride as a mild, inexpensive, and environmentally benign catalyst under solvent-free conditions. Different types of aldehyde and beta-naphthol derivatives are used in the reaction, and in all cases the products were synthesized successfully.
One-pot Three-component Route for the Synthesis of Functionalized 4<i>H</i>-chromenes Catalyzed by ZrOCl<sub>2</sub>·8H<sub>2</sub>O in Water
作者:Azim Ziyaei Halimehjani、Nahid Keshavarzi
DOI:10.1002/jhet.3081
日期:2018.2
method for the synthesis of functionalized 4H‐chromenes via a one‐pot three‐component condensation reaction of a 2‐hydroxybenzaldehyde with an active methylene compound and a carbon‐based nucleophile in the presence of a catalytic amount of ZrOCl2·8H2O in water under thermal condition has been described. High yields, simple work‐up procedure, performing reactions in water and synthesis of complex molecules