Solution-phase parallel synthesis of 4,6-diaryl-pyrimidine-2-ylamines and 2-amino-5,5-disubstituted-3,5-dihydro-imidazol-4-ones via a rearrangement
摘要:
The reaction of chalcones and guanidine was investigated in the presence of an oxidizing agent. Depending on the order of the addition either a 4,6-diaryl-pyriniidine-2-ylamine or 2-aniino-5,5-disubstituted-3,5-dihydro-imidazol-4-one was obtained. The structures of the imidazolinones were elucidated by NMR spectroscopy and X-ray crystallography and for its formation a mechanism was proposed. (C) 2003 Published by Elsevier Science Ltd.
Heterocycles. Part I. A new route to the synthesis of substituted 2-aminopyrimidines
作者:N. R. El-Rayyes
DOI:10.1002/jhet.5570190240
日期:1982.3
Heterocyclic aldehydes (A) reacted with alkyl aryl ketones (B) to give the corresponding 1,3-diaryl-2-propen-1-ones (Ia-1). Condensation of these chalcones with guanidine produced the corresponding 2-amino-4,6-diarylpyrimidines (IIa-1). The structure of all products was substantiated by chemical and spectroscopic methods.
The reaction of chalcones and guanidine was investigated in the presence of an oxidizing agent. Depending on the order of the addition either a 4,6-diaryl-pyriniidine-2-ylamine or 2-aniino-5,5-disubstituted-3,5-dihydro-imidazol-4-one was obtained. The structures of the imidazolinones were elucidated by NMR spectroscopy and X-ray crystallography and for its formation a mechanism was proposed. (C) 2003 Published by Elsevier Science Ltd.
Pyrimidine Derivatives as Potent and Selective A<sub>3</sub> Adenosine Receptor Antagonists
Two regioisomeric series of diaryl 2- or 4-amidopyrimidines have been synthesized and their adenosine receptor affinities were determined in radioligand binding assays at the four human adenosine receptors (hARs). Some of the ligands prepared herein exhibit remarkable affinities (K-i < 10 nm) and, most noticeably, the absence of activity at the A(1), A(2A), and A(2B) receptors. The structural determinants that support the affinity and selectivity profiles of the series were highlighted through an integrated computational approach, combining a 3D-QSAR model built on the second generation of G Rid INdependent Descriptors (GRIND2) with a novel homology model of the hA(3) receptor. The robustness of the computational model was subsequently evaluated by the design of new derivatives exploring the alkyl substituent of the exocyclic amide group. The synthesis and evaluation of the novel compounds validated the predictive power of the model, exhibiting excellent agreement between predicted and experimental activities.
EL-RAYYES, N. R., J. HETEROCYCL. CHEM., 1982, 19, N 2, 415-419
作者:EL-RAYYES, N. R.
DOI:——
日期:——
New pyrimidines incorporating thiophene and pyrrole moieties: synthesis and electrochemical polymerization
作者:Anastasiya Yu. Bushueva、Elena V. Shklyaeva、Georgii G. Abashev
DOI:10.1016/j.mencom.2009.11.012
日期:2009.11
The synthesis and electrochemical polymerization on the indium-tin oxide covered glass plates of two new substituted pyrimidines, namely, (1H-pyrrol-1-yl)-4,6-di(thiophen-2-yl)pyrimidine and [2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl]-4,6-di(thiophen-2-yl)-pyrimidine was performed; the structure of the latter was determined by X-ray methods.