HMDS/KI a simple, a cheap and efficient catalyst for the one-pot synthesis of <i>N</i>-functionalized pyrimidines
作者:Az-Eddine El Mansouri、Mohamed Zahouily、Hassan B. Lazrek
DOI:10.1080/00397911.2019.1602655
日期:2019.7.18
Abstract The syntheses of N-Alkylpyrimidine derivatives by reacting pyrimidin-2,4-diones with appropriate alkyl halide under microwave irradiation at 400 W were compared to the conventional synthesis route. These methodologies are regioselective and compatible with numerous substrates and furnish the corresponding N-alkylpyrimidines in good yields using a cheap catalyst HMDS/KI in MeCN. A comparison
Efficient and selective catalytic N-Alkylation of pyrimidine by ammonium Sulfate@Hydro-thermal carbone under eco-friendly conditions
作者:SOUMIA BELKHARCHACH、HANA IGHACHANE、ABDESSADEK LACHGAR、MUSTAPHA AIT ALI、HASSAN B LAZREK
DOI:10.1007/s12039-020-01776-3
日期:2020.12
An efficient and inexpensive method for the N-alkylation of pyrimidines using ammonium sulfate coated Hydro-Thermal-Carbone (HTC) (AS@HTC) as reused heterogeneous catalyst was developed. The catalyst was characterized by several analytical techniques such as SEM, XRD, and FTIR. The effect of various parameters was studied including catalyst loading, mole ratio, to achieve excellent selectivity and yields in 80–90%. Significantly, the present protocol offers the use of an inexpensive and environmentally friendly catalyst and simple workup. The simplicity of the procedure, excellent yield of the products, and the recyclability of the catalyst are the main advantages of this method. Ammonium sulfate coated Hydro-Thermal-Carbone (HTC) (AS@HTC); an efficient and reused heterogeneous catalyst of the N-alkylation of pyrimidines was developed. Excellent selectivity and yields (80–90%) toward N1-alkylpyrimidines were achieved. Significantly, the present protocol offers the use of an inexpensive and environmentally friendly catalyst and simple workup.
Synthesis and Evaluation of Neutral Gd(III), Mn(II) Complexes From DTPA-Bisamide Derivative as Potential MRI Contrast Agents
作者:Zhen-Chuan Liao、Chao-Rui Li、Zheng-Yin Yang
DOI:10.1080/15533174.2014.988820
日期:2016.5.3
strong chelating ligand was synthesized through the modification of DTPA by bioactive 5-fluorouracil derivatives and characterized by means of mass spectra, Fourier transform infrared spectra, elemental analysis, and nuclear magnetic resonance spectroscopy. Its complexes of Gd(III) and Mn(II) were designed as potentialMRIcontrastagents. Thermodynamic stability constant of the complexes indicated that