Heterogeneous ditopic ZnFe<sub>2</sub>O<sub>4</sub>catalyzed synthesis of 4H-pyrans: further conversion to 1,4-DHPs and report of functional group interconversion from amide to ester
Highly stable, environmentally benign ZnFe2O4 nanopowder was prepared, characterized and applied in the one-pot, three-component synthesis of 4H-pyrans in water. The ZnFe2O4 catalyst provides both acidic (Fe3+) and basic functionalities (O2−) as the reaction requires. The advantages of this method lie in its simplicity, cost effectiveness, environmental friendliness and easier scaling up for large scale synthesis. Water was exploited both as a reaction medium as well as a medium for synthesis of the catalyst. Moreover, water was the only byproduct. The present report puts forward an application of 4H-pyrans for the synthesis of 1,4-DHPs. This is the first attempt towards the synthesis of 4H-pyran-3-carboxylate from 4H-pyran-3-carboxamide. The corresponding functional group interconversion from amide to ester is rare in organic synthesis.
Xanthenones: calixarenes-catalyzed syntheses, anticancer activity and QSAR studies
作者:Daniel Leite da Silva、Bruna Silva Terra、Mateus Ribeiro Lage、Ana Lúcia Tasca Góis Ruiz、Cameron Capeletti da Silva、João Ernesto de Carvalho、José Walkimar de Mesquita Carneiro、Felipe Terra Martins、Sergio Antonio Fernades、Ângelo de Fátima
DOI:10.1039/c4ob02611j
日期:——
An efficient method is proposed for obtaining tetrahydrobenzo[a]xanthene-11-ones and tetrahydro-[1,3]-dioxolo[4,5-b]xanthen-9-ones. The method is based on the use of p-sulfonic acid calix[n]arenes as catalystsundersolvent-freeconditions. The antiproliferative activity of fifty-nine xanthenones against six human cancer cells was studied. The capacity of all compounds to inhibit cancer cell growth
Rice husk: A mild, efficient, green and recyclable catalyst for the synthesis of 12-Aryl-8, 9, 10, 12-tetrahydro [a] xanthene-11-ones and quinoxaline derivatives
Résumé Rice husk, as a green and cheap reagent, can be used for the promotion of the synthesis of 12-aryl -8, 9,10,12-tetrahydrobenzo[α] xanthen-11-one derivatives (ATXOs) via three-component reaction of aldehydes, 2-naphthol and 5,5-dimethyl-1,3-cyclohexadione (dimedone) under solvent-free conditions. This catalyst can also be used for the preparation of quinoxaline derivatives in a mixture of H2O and CH3CN at 50 °C. The present methodology offers several advantages such as high yields, simple procedure, low cost, short reaction times, mild reaction conditions and use of a green, cheap and reusable catalyst.
Preparation of core/shell/shell CoFe
<sub>2</sub>
O
<sub>4</sub>
/OCMC/Cu (BDC) nanostructure as a magnetically heterogeneous catalyst for the synthesis of substituted xanthenes, quinazolines and acridines under ultrasonic irradiation
作者:Mohammad Ali Ghasemzadeh、Fatemeh Ghaffarian
DOI:10.1002/aoc.5580
日期:2020.5
Highly efficient synthesized magnetic cobalt ferrite nanoparticles supported on OCMC@Cu (BDC) was utilized in the preparation of biologically active heterocyclic compounds through one‐pot three‐component reactions between of aldehydes, dimedone, aryl amines/2‐naphthol/urea under ultrasonic irradiation. This method has various advantages including excellent yields, little catalyst loading, simple procedure
Succinimide-N-sulfonic acid: An efficient catalyst for the synthesis of xanthene derivatives under solvent-free conditions
作者:Farhad Shirini、Nader Ghaffari Khaligh
DOI:10.1016/j.dyepig.2012.06.022
日期:2012.12
A mild, simple and convenient procedure for the synthesis of xanthene derivatives is described via three component condensation of aldehydes with 2-naphthol, 1,3-cyclohexanedione and/or a mixture of 2-naphthol and 1,3-cyclohexanediones using succinimide-N-sulfonic acid as an efficient, cheap and readily synthesiscatalystundersolvent-freeconditions. The structures of the products were characterized
通过醛与2-萘酚,1,3-环己二酮和/或2-萘酚和1,3-环己二酮的混合物使用琥珀酰亚胺-N进行三组分缩合,描述了一种温和,简单,方便的合成x吨衍生物的方法。-磺酸在无溶剂条件下作为一种高效,廉价且易于合成的催化剂。产品的结构通过其物理常数,与真实样品的比较以及IR,1 H NMR和13 C NMR光谱进行表征。本方法提供了许多优点,例如高收率,简单的方法,低成本,短的反应时间,无溶剂和温和的反应条件以及使用可重复使用的催化剂。