recombinant human A(1), A(2A), A(2B), and A(3) receptors, all compounds showed very low or negligible affinity for A(1) and A(2B) receptors but compounds 3, 5, and 7 displayed a remarkably potent affinity for the A(2A) receptor with K(i) values of 1-5 nM. Bromo derivative 3 displayed a selectivity A(1)/A(2A) = 62 and A(3)/A(2A) = 16 whereas the presence of a hydroxyl group (compound 5) improved the selectivity
Efficient Synthesis of an Adenosine A2a Agonist: Glycosylation of 2-Haloadenines and an <i>N</i><sup>2</sup>-Alkyl-6-chloroguanine
作者:John M. Caddell、Alan M. Chapman、Bob E. Cooley、Brian P. Downey、Michael P. LeBlanc、Mary M. Jackson、Thomas M. O'Connell、Hahn-My Phung、Thomas D. Roper、Shiping Xie
DOI:10.1021/jo049963x
日期:2004.4.1
A convergent synthesis of adenosine A2a agonist 1 in the form of its maleate salt 2 was achieved. The key step in this approach was the highly selective 9beta-glycosylation reaction between 2-haloadenines or an N-2-alkyl-6-chloroguanine and a D-ribose derivative containing a 2-ethyltetrazolyl moiety. Glycosylations of other purine derivatives were also examined, and the methods developed provide efficient access to a variety of adenosine analogues such as 2-alkylaminoadenosines, an attractive class of compounds with antiinflammatory activity.