Issue 1, 2018

Studies on enantioselectivity of chiral 4-acetylamino-6-alkyloxy-2-alkylthiopyrimidines acting as antagonists of the human A3 adenosine receptor

Abstract

Three A3 adenosine receptor (AR) antagonists (1–3) selected from 4-acylamino-6-alkyloxy-2-alkylthiopyrimidines previously investigated by us were modified by inserting a methyl group on their ether or thioether side chains. These compounds gave us the chance to evaluate whether their higher lipophilicity, reduced conformational freedom and chirality might improve the potency towards the A3 AR. Racemic mixtures of 1–3 were resolved using chiral HPLC methods and the absolute configurations of the enantiomers were assigned by chiroptical spectroscopy and density functional theory calculations. We measured the affinity for human A1, A2A, A2B and A3 ARs of the racemic mixtures and the pure enantiomers of 1–3 by radioligand competition binding experiments. Cell-based assays of the most potent enantiomers confirmed their A3 AR antagonist profiles. Our research led to the identification of (S)-1 with high potency (0.5 nM) and selectivity as an A3 AR antagonist. Moreover we built a docking-model useful to design new pyrimidine derivatives.

Graphical abstract: Studies on enantioselectivity of chiral 4-acetylamino-6-alkyloxy-2-alkylthiopyrimidines acting as antagonists of the human A3 adenosine receptor

Supplementary files

Article information

Article type
Research Article
Submitted
24 Jul 2017
Accepted
08 Nov 2017
First published
09 Nov 2017

Med. Chem. Commun., 2018,9, 81-86

Studies on enantioselectivity of chiral 4-acetylamino-6-alkyloxy-2-alkylthiopyrimidines acting as antagonists of the human A3 adenosine receptor

B. Cosimelli, G. Greco, S. Laneri, E. Novellino, A. Sacchi, S. Collina, D. Rossi, S. Cosconati, E. Barresi, S. Taliani, M. L. Trincavelli and C. Martini, Med. Chem. Commun., 2018, 9, 81 DOI: 10.1039/C7MD00375G

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