• Xiyan Hou, Mahesh S Majik, Kyunglim Kim, Yuna Pyee, Yoonji Lee, Varughese Alexander, Hwa-Jin Chung, Hyuk Woo Lee, Girish Chandra, LeeJin HeeJH, Seul-Gi Park, Won Jun Choi, Hea Ok Kim, Khai Phan, Zhan-Guo Gao, Kenneth A Jacobson, Sun Choi, Sang Kook Lee, and Lak Shin Jeong.
• Laboratory of Medicinal Chemistry, College of Pharmacy, and Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea.
• J. Med. Chem. 2012 Jan 12; 55 (1): 342-56.

AbstractTruncated N(6)-substituted-4'-oxo- and 4'-thioadenosine derivatives with C2 or C8 substitution were studied as dual acting A(2A) and A(3) adenosine receptor (AR) ligands. The lithiation-mediated stannyl transfer and palladium-catalyzed cross-coupling reactions were utilized for functionalization of the C2 position of 6-chloropurine nucleosides. An unsubstituted 6-amino group and a hydrophobic C2 substituent were required for high affinity at the hA(2A)AR, but hydrophobic C8 substitution abolished binding at the hA(2A)AR. However, most of synthesized compounds displayed medium to high binding affinity at the hA(3)AR, regardless of C2 or C8 substitution, and low efficacy in a functional cAMP assay. Several compounds tended to be full hA(2A)AR agonists. C2 substitution probed geometrically through hA(2A)AR docking was important for binding in order of hexynyl > hexenyl > hexanyl. Compound 4g was the most potent ligand acting dually as hA(2A)AR agonist and hA(3)AR antagonist, which might be useful for treatment of asthma or other inflammatory diseases.

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