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
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。
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.