Brønsted Acidic Ionic Liquid as an Efficient and Reusable Catalyst for One-Pot, Three-Component Synthesis of Pyrimidinone Derivatives via Biginelli-Type Reaction Under Solvent-Free Conditions
作者:Abdol R. Hajipour、Yosof Ghayeb、Nafisehsadat Sheikhan、Arnold E. Ruoho
DOI:10.1080/00397911.2010.501474
日期:2011.8
cyclopentanone and urea or thiourea in the presence of N-(4-sulfonic acid) butyl triethyl ammonium hydrogen sulfate ([TEBSA][HSO4]) as the Brønstedacidicionicliquid and effective catalyst under thermal and solvent-free conditions. Good yields, short reaction times, straightforward workup, reusability of the catalyst, and green conditions are the most obvious advantages of this procedure.
Potassium phthalimide: An efficient and green organocatalyst for the synthesis of 4-aryl-7-(arylmethylene)-3,4,6,7-tetrahydro-1H-cyclopenta[d]pyrimidin-2(5H)-ones/thiones under solvent-free conditions
作者:Hamzeh Kiyani、Maryam Ghiasi
DOI:10.1016/j.cclet.2013.11.042
日期:2014.2
Abstract An efficient synthesis of Biginelli-type compounds using potassiumphthalimide as a green, mild, and commercially available organocatalyst in a one-pot, multi-component cyclocondensation reaction of cyclopentanone, aldehydes, and urea/thiourea is reported. The present methodology is a green approach to access 4-aryl-7-(arylmethylene)-3,4,6,7-tetrahydro-1 H -cyclopenta[ d ]pyrimidin-2(5 H )-ones/thiones
Synthesis of Substituted Pyrimidinones Catalyzed by Boric Acid and Glycerol in Aqueous Medium
作者:Chhanda Mukhopadhyay、Arup Datta
DOI:10.1080/00397911.2011.602497
日期:2013.1
An expeditious one-pot synthesis of substituted pyrimidinone derivatives with aromatic aldehydes, cyclopentanone, and urea (or thiourea) was developed with boric acid (10 mol%) and glycerol (0.1 mL) in aqueous medium at 45-50 degrees C. The methodology is simple, highly efficient, and high yielding. The idea behind this methodology is that boric acid, being a weak acid, behaves as a strong acid in presence of glycerol in aqueous medium.