A general, efficient, and green method for one-potsynthesis of functionalized spirooxindoles through three-component condensation reaction of isatins, cyclohexane-1,3-diones, and barbituric acids is described employing gluconic acid aqueous solution (GAAS) as a novel reaction medium and catalyst. The reaction medium could be recycled and reused several times without significant loss of its efficiency
Alum (KAl(SO4)2·12H2O) Catalyzed Multicomponent Transformation: Simple, Efficient, and Green Route to Synthesis of Functionalized Spiro[chromeno[2,3-d]pyrimidine-5,3′-indoline]-tetraones in Ionic Liquid Media
作者:Mojtaba Mirhosseini Moghaddam、Ayoob Bazgir、Akhondi Mohammad Mehdi、Ramin Ghahremanzadeh
DOI:10.1002/cjoc.201280014
日期:2012.3
The combination of isatin, barbituric acid, and cyclohexane‐1,3‐dione derivatives in the presence of alum (KAl(SO4)2·12H2O) as a catalyst for 15 min was found to be a suitable and efficient method for the synthesis of spiro[chromeno[2,3‐d]pyrimidine‐5,3′‐indoline]‐tetraones.
发现在明矾(KAl(SO 4)2 ·12H 2 O)作为催化剂存在下15分钟将Isatin,巴比妥酸和环己烷-1,3-二酮衍生物组合使用是一种合适且有效的方法螺[ chromeno [2,3 - d ]嘧啶-5,3'-二氢吲哚]-四酮的合成。
MnFe<sub>2</sub>O<sub>4</sub>@NH<sub>2</sub>@2AB-Ni: a novel, highly active, stable and magnetically recoverable nanocatalyst and use of this heterogeneous catalyst in green synthesis of spirooxindoles in water
In this research, superparamagnetic manganese ferrite nanoparticles were synthesized following a co-precipitation method, and subsequently coated with 3-aminopropyltriethoxysilane (APTES) through a silanization reaction. Manganese ferrite nanoparticles afforded bidentate ligands as a result of the reaction between isatoic anhydride and amino-functionalized MnFe2O4. The amino-functionalized nanoparticles were treated with nickel acetate, giving the immobilized nickel complex. Finally, catalytic properties of the prepared nanoparticles were examined by a green synthesis of spirooxindoles in water and they showed excellent catalytic activity. Recovery of the catalyst was simply achieved by applying an external permanent magnet. The isolated catalyst was reused for new reaction runs without significant loss of catalytic activity.