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EnglishThe structure-activity relationship (SAR) of new 5,8-disubstituted-1,2,4-triazolo[1,5-c]pyrimidines as adenosine receptors (ARs) antagonists has been explored. All the synthesized compounds show affinity for the hA2A and hA3 ARs depending on the substitution patterns at the 5 and 8 positions. In particular, a free amino group at the 5 position with an ethoxycarbonyl group at the 8 position leads to potent and quite selective hA2A antagonists (compound 12: hA2A AR Ki=3.32 nM; hA1/hA2A=55.6; hA2A/hA3=0.01), whereas the introduction of a methylamino function at the 5 position yields a good binding profile at the hA3 AR (compound 23: hA3 AR Ki=4.14 nM, hA1/hA3=236; hA2A/hA3=25). Through an in silico receptor-driven approach, we have determined the most favorable orientation of the substitutions at the 5 and 8 positions of the 1,2,4-triazolo[1,5-c]pyrimidine (TP) scaffold and, accordingly, we have elucidated the observed SAR.
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| Titolo: | Scaffold decoration at positions 5 and 8 of 1,2,4-triazolo[1,5-c]pyrimidines to explore the antagonist profiling on adenosine receptors: a preliminary structure-activity relationship study |
| Autori: | |
| Data di pubblicazione: | 2014 |
| Rivista: | |
| Abstract: | The structure-activity relationship (SAR) of new 5,8-disubstituted-1,2,4-triazolo[1,5-c]pyrimidines as adenosine receptors (ARs) antagonists has been explored. All the synthesized compounds show affinity for the hA2A and hA3 ARs depending on the substitution patterns at the 5 and 8 positions. In particular, a free amino group at the 5 position with an ethoxycarbonyl group at the 8 position leads to potent and quite selective hA2A antagonists (compound 12: hA2A AR Ki=3.32 nM; hA1/hA2A=55.6; hA2A/hA3=0.01), whereas the introduction of a methylamino function at the 5 position yields a good binding profile at the hA3 AR (compound 23: hA3 AR Ki=4.14 nM, hA1/hA3=236; hA2A/hA3=25). Through an in silico receptor-driven approach, we have determined the most favorable orientation of the substitutions at the 5 and 8 positions of the 1,2,4-triazolo[1,5-c]pyrimidine (TP) scaffold and, accordingly, we have elucidated the observed SAR. |
| Handle: | http://hdl.handle.net/11392/2331921 |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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