Synthesis of some tricyclic heteroaromatic systems and their A1 and A2a adenosine binding activity
摘要:
The syntheses, A(1) and A(2a) adenosine receptor affinities and structure-activity relationships of some 2-aryl-1,2,4-triazolo[1,5-a]quinoxalines, 2-arylimidazo[1,2-a]quinoxalines, 1-arylimidazo[1,5-a]quinoxalines are reported and compared with that of a previously reported 2-phenylpyrazolo[1,5-a]quinoxaline. The results show that some triazoloquinoxalines are potent and specific A(1) adenosine receptor ligands and that the replacement of either nitrogen at position 1 or 3 of the triazoloquinoxaline moiety with a CH brought about a decrease in affinity at both adenosine receptors.
Synthesis of some tricyclic heteroaromatic systems and their A1 and A2a adenosine binding activity
摘要:
The syntheses, A(1) and A(2a) adenosine receptor affinities and structure-activity relationships of some 2-aryl-1,2,4-triazolo[1,5-a]quinoxalines, 2-arylimidazo[1,2-a]quinoxalines, 1-arylimidazo[1,5-a]quinoxalines are reported and compared with that of a previously reported 2-phenylpyrazolo[1,5-a]quinoxaline. The results show that some triazoloquinoxalines are potent and specific A(1) adenosine receptor ligands and that the replacement of either nitrogen at position 1 or 3 of the triazoloquinoxaline moiety with a CH brought about a decrease in affinity at both adenosine receptors.
Imidazoquinoxaline and pyrazoloquinoxaline derivatives, analogues of imiquimod, were synthesized, and their in vitro cytotoxic and pharmacodynamic activities were evaluated. In vitro cytotoxicity studies were assessed against melanoma (A375, M4Be, RPMI-7591), colon (LS174T), breast (MCF7), and lymphoma (Raji) human cancer cell lines. In vivo studies were carried out in M4Be xenografted athymic mice. EAPB0103, EAPB0201, EAPB0202, and EAPB0203 showed significant in vitro activities against A375 compared to fotemustine and imiquimod used as references. These compounds were 6-110 and 2-45 times more active than fotemustine and imiquimod, respectively. EAPB0203 bearing phenethyl as substituent at position 1 and methylamine at position 4 showed the highest activity. EAPB0203 has also a more potent cytotoxic activity than imiquimod and fotemustine in M4Be and RPMI-7591 and interesting cytotoxic activity in other tumor cell lines tested. In vivo, EAPB0203 treatment schedules caused a significant decrease in tumor size compared to vehicle control and fotemustine treatments. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis of some tricyclic heteroaromatic systems and their A1 and A2a adenosine binding activity
The syntheses, A(1) and A(2a) adenosine receptor affinities and structure-activity relationships of some 2-aryl-1,2,4-triazolo[1,5-a]quinoxalines, 2-arylimidazo[1,2-a]quinoxalines, 1-arylimidazo[1,5-a]quinoxalines are reported and compared with that of a previously reported 2-phenylpyrazolo[1,5-a]quinoxaline. The results show that some triazoloquinoxalines are potent and specific A(1) adenosine receptor ligands and that the replacement of either nitrogen at position 1 or 3 of the triazoloquinoxaline moiety with a CH brought about a decrease in affinity at both adenosine receptors.