Ion exchange resin catalyzed multicomponent Biginelli reaction is studied for the synthesis of 3,4- dihydropyrimidin-2-ones. Among the various solid acid catalysts Indion-130 was found to be most efficient, recyclable and environmentally benign heterogeneous catalyst regarding reaction time, yield and ease of work up procedure.
A Facile and Efficient One‐Pot Synthesis of Dihydropyrimidinones Catalyzed by Magnesium Bromide Under Solvent‐Free Conditions
作者:Hojatollah Salehi、Qing‐Xiang Guo
DOI:10.1081/scc-120027250
日期:2004.12.31
Abstract Magnesiumbromide efficiently catalyzes the three‐component condensation reaction of aldehyde, β‐diketon and urea/thiourea under solvent‐free conditions to afford the corresponding dihydropyrimidinones in high yields and short reaction time.
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.
Sulfated zirconia has been demonstrated as an efficient catalyst for the synthesis of 3,4-dihydropyrimidin-2(1H)-onesundermicrowaveirradiation and conventional heating. The solid acid catalyst i...
Indium(III) Chloride-Catalyzed One-Pot Synthesis of Dihydropyrimidinones by a Three-Component Coupling of 1,3-Dicarbonyl Compounds, Aldehydes, and Urea: An Improved Procedure for the Biginelli Reaction
作者:Brindaban C. Ranu、Alakananda Hajra、Umasish Jana