KF-26777

KF-26777

Systematic (IUPAC) name
(2-(4-bromophenyl)-7,8-dihydro-4-propyl-1H-imidazo[2,1-i]purin-5(4H)-one
Identifiers
Synonyms	KF-26777
Chemical data
Formula	C16H18BrN5O
Molar mass	376.250 g/mol
SMILES CCCN(C2=O)C1N=C(c(cc3)ccc3Br)NC1C=4N2CCN=4
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KF-26777 is a drug which acts as a potent and selective antagonist for the adenosine A₃ receptor, with sub-nanomolar affinity (A₃ Ki=0.2nM) and high selectivity over the other three adenosine receptor subtypes.^[1] Simple xanthine derivatives such as caffeine and DPCPX have generally low affinity for the A₃ subtype and must be extended by expanding the ring system and adding an aromatic group to give high A₃ affinity and selectivity.^[2]

References

1. Saki M, Tsumuki H, Nonaka H, Shimada J, Ichimura M (May 2002). "KF26777 (2-(4-bromophenyl)-7,8-dihydro-4-propyl-1H-imidazo[2,1-i]purin-5(4H)-one dihydrochloride), a new potent and selective adenosine A3 receptor antagonist". European Journal of Pharmacology 444 (3): 133–41. doi:10.1016/S0014-2999(02)01662-X. PMID 12063073.
2. Baraldi PG, Tabrizi MA, Gessi S, Borea PA (January 2008). "Adenosine receptor antagonists: translating medicinal chemistry and pharmacology into clinical utility". Chemical Reviews 108 (1): 238–63. doi:10.1021/cr0682195. PMID 18181659.