The Biginelli Reaction with an Imidazolium-Tagged Recyclable Iron Catalyst: Kinetics, Mechanism, and Antitumoral Activity
作者:Luciana M. Ramos、Bruna C. Guido、Catharine C. Nobrega、José R. Corrêa、Rafael G. Silva、Heibbe C. B. de Oliveira、Alexandre F. Gomes、Fábio C. Gozzo、Brenno A. D. Neto
DOI:10.1002/chem.201204314
日期:2013.3.25
The present work describes the synthesis, characterization, and application of a new ion‐tagged iron catalyst. The catalyst was employed in the Biginelli reaction with impressive performance. High yields have been achieved when the reaction was carried out in imidazolium‐based ionicliquids (BMI⋅PF6, BMI⋅NTf2, and BMI⋅BF4), thus showing that the ionic‐liquid effects play a role in the reaction. Moreover
Dihydropyrimidinones are prepared from zinc chloride (20 mol%) catalyzed Biginelli condensation of an aldehyde, 1,3-dicarbonyl compounds and urea or thiourea at 80 °C for short time under solvent-free conditions in high yields.
A Practical and Green Approach towards Synthesis of Dihydropyrimidinones without Any Solvent or Catalyst
作者:Brindaban C. Ranu、Alakananda Hajra、Suvendu S. Dey
DOI:10.1021/op0255478
日期:2002.11.1
A simple, efficient, green, and cost-effective procedure has been developed for the synthesis of dihydropyrimidinones by a solvent-free and catalyst-freeBiginelli's condensation of 1,3-dicarbonyl compound, aldehyde, and urea. This approach of direct reaction in neat without solvent and catalyst shows a new direction in green synthesis.
B(C6F5)3 catalyzed one-pot three-component Biginelli reaction: An efficient and environmentally benign protocol for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones
procedure. Moreover, the applicability of the present methodology for large-scale synthesis of monastrol highlights its potential for bulk synthesis. Tris(pentafluorophenyl)borane catalyzed, one-pot, simple, efficient and environmentally benign protocol for the synthesis of dihydropyrimidinones/thiones via Biginelli reaction has been described.
Magnesium Chloride Hexahydrate Catalyzed One‐Pot Synthesis of 3,4‐Dihydropyrimidin‐2‐(1<i>H</i>)ones Under Solvent‐Free Conditions
作者:Guo‐Lin Zhang、Xiao‐Hua Cai
DOI:10.1081/scc-200050956
日期:2005.3
Abstract 3,4‐Dihydropyrimidin‐2‐(1H)‐one were prepared by Biginelli condensation of aldehyde, 1,3‐dicarbonyl compound and urea under solvent‐free condition at 80°C with magnesiumchloridehexahydrate as catalyst.