The reaction of 2-chloro-3-propargylaminoquinoxaline with various aryl iodides and bromides catalyzed by Pd-Cu in the presence of potassium carbonate as the base in water leads to the one-pot formation of 1-aryl-substituted-4-chloroimidazo[1,2-a]quinoxalines in moderate-to-high yields. (C) 2012 Elsevier Ltd. All rights reserved.
US6124287
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Imidazo[1,2-a]quinoxalin-4-amines: A novel class of nonxanthine A1-adenosine receptor antagonists
The syntheses and A(1) adenosine receptor affinities of a number of imidazo[1,2-alpha]quinoxalin-4-amines are reported. Structure activity relationships within the series and in comparison with other similar tricyclic nonxanthine adenosine antagonists are discussed, leading to a putative common binding mode of these nitrogen-containing heterocycles to A(1) adenosine receptors. Secondary amino compounds displayed the best affinities toward A(1) receptors, while the tertiary amines were almost devoid of activity, thus suggesting a crucial role for the hydrogen bond-forming 4-NH group. Remarkably higher potencies for l-methyl and N-cyclopentyl derivatives were also found. 4-Cyclopentylamino-1-methylimidazo[1,2-alpha]quinoxaline (IRFI 165) is the most potent compound in this series, having K-i(A(1)) = 7.9 nM. It is also provided with a good A(1) selectivity both versus A(2a) and A(3) subtypes and was selected for further pharmacological studies. (C) Elsevier, Paris.
US06124287
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IMIDAZO[1,2-a]QUINOXALIN-4-AMINES ACTIVE AS ADENOSINE ANTAGONISTS, PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS THEREOF
申请人:Biomedica Foscama Industria Chimico-Farmaceutica S.p.A.