Structure-activity relationships of adenosines with heterocyclic N6-substituents

Two series of N-6-substituted adenosines with monocyclic and bicyclic N-6 substituents containing a heteroatom were synthesized in good yields. These derivatives were assessed for their affinity ([H-3]CPX), potency, and intrinsic activity (cAMP accumulation) at the A, adenosine receptor in DDT1 MF-2 cells. In the monocyclic series, the N-6-tetrahydrofuran-3-yl and thiolan-3-yl adenosines (1 and 26, respectively) were found to possess similar activities, whereas the corresponding selenium analogue 27 was found to be more potent. A series of nitrogen containing analogues showed varying properties, N-6-((3R)-1-benzyloxycarbonylpyrrolidin-3-yl)adenosine (30) was the most potent at the AIAR; IC50 = 3.2 nM. In the bicyclic series, the effect of a 7-azabicyclo[2.2.1]heptan-2-yl substituent in the N-6-position was explored. N6- (7-Azabicyclo[2.2.1] heptan-2-yl)adeno sine (38) proved to be a reasonably potent A, agonist (K-i = 51 nM, IC50 = 35 nM) while further substitution on the 7 ''-nitrogen with tert-butoxycarbonyl (31, IC50 = 2.5 nM) and 2-bromobenzyloxycarbonyl (34, IC50 = 9.0 nM) gave highly potent A(1)AR agonists. (c) 2007 Elsevier Ltd. All rights reserved.