Brønsted Acidic Ionic Liquid–Catalyzed One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones and Thiones Under Solvent-Free Conditions
作者:Abdol R. Hajipour、Leila Khazdooz、Amin Zarei
DOI:10.1080/00397911.2010.501471
日期:2011.8
Abstract An efficient and convenient procedure for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and thiones by condensation of ethylacetoacetate, aldehydes, and urea or thiourea in the presence of methylimidazolium hydrogensulfate is described. Aromatic and aliphatic aldehydes reacted easily to afford the corresponding 3,4-dihydropyrimidin-2(1H)-ones and thiones under solvent-freeconditions. The use
A microwave-assisted, copper-catalyzed three-component synthesis of dihydropyrimidinones under mild conditions
作者:Kalyan Kumar Pasunooti、Hua Chai、Chantel Nixon Jensen、Bala Kishan Gorityala、Siming Wang、Xue-Wei Liu
DOI:10.1016/j.tetlet.2010.10.150
日期:2011.1
The synthesis of dihydropyrimidinones via a clean multi-component Biginelli reaction under microwave irradiation is reported. The copper-catalyzed process proved to be simple, efficient, economical, and environmentally friendly. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis, Crystal Structure, and Spectroscopic Properties of 5-Ethoxycarbonyl-4-[(4-methoxy-carbonyl)phenyl] -6-methyl-3,4-dihydropyrimidin2(1H)-ones
作者:H.-N. Peng、D.-G. Zheng、X.-H. Zeng、J.-R. Hu、H.-D. Ye
DOI:10.1080/15421406.2014.963211
日期:2015.3.4
The title compound, 5-ethoxycarbonyl-4-[(4-methoxycarbonyl)phenyl]-6-methyl-3,4-dihydropyrimidin-2(1H)-ones (1), was synthesized from the one-pot, three-component condensation reactions and characterized by FTIR, H-1 NMR, HRMS, and single crystal X-ray diffraction. The compound (1) crystallizes in a triclinic system, space group P-1 with a = 6.1874(12), b = 7.5715(15), c = 17.369(4)angstrom, alpha = 80.24(3), beta = 81.15(3), gamma = 76.93(3)degrees, and Z = 2. The molecules are linked by hydrogen bonds N-H center dot center dot center dot O and C-H center dot center dot center dot O to generate a 2D network. In addition, UV-visible and fluorescence spectral measurements prove that it shows positive solvatochromic effect as the solvent polarity was increased.