Supported Preyssler Nanoparticles in Synthesis of 1,3-Diaryl-5-Spirohexahydropyrimidines
作者:Majid M. Heravi、Samaheh Sadjadi、Sodeh Sadjadi、Hossein A. Oskooie、Rahim Hekmat Shoar、Fatemeh F. Bamoharram
DOI:10.1002/jccs.200900035
日期:2009.4
Silica‐supportedPreysslernanoparticles (H14[NaP5W30O110])/SiO2 are used as a new and recyclable catalyst for the preparation of 1,3‐diaryl‐5‐spirohexahydropyrimidines via a one‐pot condensation of anilines, formaldehyde, and cyclohexanone.
二氧化硅支撑的Preyssler纳米颗粒(H 14 [NaP 5 W 30 O 110 ])/ SiO 2被用作一种新型可循环使用的催化剂,可通过苯胺的一锅缩合制备1,3-二芳基-5-螺六氢嘧啶,甲醛和环己酮。
Indium triflate catalyzed one-pot multicomponent synthesis of spiro-hexahydropyrimidines explained by multiple covalent bond formation
作者:Anshu Dandia、Anuj K. Jain、Sonam Sharma
DOI:10.1016/j.tetlet.2012.07.079
日期:2012.9
A mild, efficient, and expeditious method has been developed for the synthesis of spiro-hexahydropyrimidine derivatives via a three-component, one-pot cyclocondensation reaction of aromatic amines, formaldehyde, and cyclic ketones in 4-6 h using In(OTf)(3) as Lewis acid catalyst for the first time. The reaction involving creation of six new covalent bonds was efficiently promoted by 10 mol % In(OTf)(3) and the catalyst could be recovered easily after the reaction and reused without any loss of its catalytic activity. The advantageous features of this methodology are high atom-economy, operational simplicity, shorter reaction time, and easy handling. (c) 2012 Elsevier Ltd. All rights reserved.
New Light on an Old Story: Facile and Efficient Synthesis of 1,3-Diaryl-5-spirohexahydro- pyrimidines via a Six-Molecule, Three-Component Mannich-Type Reaction
A facile and efficient synthesis of I,3-diaryl-5-spirohexahy-dropyrimidines via a one-pot condensation of anilines, formaldehyde, and cyclohexanones is reported. In this one-pot, three-component reaction, six molecules of reactants are involved and six new covalent bonds are generated. Bicyclic products are obtained from the starting materials in one pot using readily available starting materials and catalysts.
CuFe2O4 nanoparticles as a highly efficient and magnetically recoverable catalyst for the synthesis of medicinally privileged spiropyrimidine scaffolds
作者:Anshu Dandia、Anuj K. Jain、Sonam Sharma
DOI:10.1039/c2ra22477a
日期:——
A highly efficient and green protocol for the synthesis of medicinally important fluorinated spiropyrimidine derivatives involving creation of six new covalent bonds has been developed using a magnetically separable and reusable heterogeneous copper ferrite nanocatalyst under mild reaction conditions. The synthesis of inverse spinel copper ferrite magnetic nanoparticles with average size of 38 nm has been achieved using combined sonochemical and co-precipitation techniques in aqueous medium from readily available inexpensive starting materials without any surfactant or capping agent. The particle size was determined by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The magnetic nature of catalyst facilitates its easy removal from the reaction medium and can be reused five times without any significant loss of its catalytic activity. Negligible leaching of Cu and Fe in consecutive cycles makes the catalyst economical and environmentally benign. The structure of final products was established by single crystal X-ray analysis and spectroscopic techniques.