Synthesis of 2-chloropurine ribosides with chiral amino acid amides at C6 and their evaluation as A1 adenosine receptor agonists

Abstract

A series of purine ribonucleosides bearing chiral amino acid amides at the C6 position of 2-chloropurine was synthesized. Molecular docking of the synthesized analogs of 2-chloroadenosine by their affinity for A₁ adenosine receptors (A₁ARs) was conducted. The investigation of A₁AR stimulating activity of synthesized nucleosides was carried out in a model of an isolated mouse atrium. We have shown that derivatives with tyrosine, valine, and serine residues exhibit the properties of A₁AR partial agonists. Animal experiments in the open field test have shown that these compounds have different profiles of psychoactive action. These nucleosides have an ophthalmic hypotensive effect and reduce intraocular pressure in a manner slightly inferior to that of timolol and brimonidine. The synthesized nucleosides can be the basis for further design and synthesis of new A₁AR agonists.

Keywords: Adenosine Derivative; Adenosine Receptor Agonists; Intraocular Pressure.