high affinity at the hA3 AR (Ki values ranging from 1.46 to 44.8 nM), as well as remarkable selectivity versus A1, A2A, and A2B AR subtypes. Compound (R)-4-allyl-8-ethyl-7,8-dihydro-2-(3-methoxy-1-methyl-1H-pyrazol-5-yl)-1H-imidazo[2,1-i]purin-5(4H)-one (R-33) was found to be the most potent and selective ligand of the series (Ki hA3 = 1.46 nM, Ki hA2A/Ki hA3 > 3425; IC50 hA2B/Ki hA3 > 3425; Ki hA1/Ki
                                    一系列4-烯丙基/苄基-7,8-二氢-8-甲基/乙基-2-[(取代的)
异恶唑/
吡唑-3 / 5-基] -1 H-
咪唑并[2,1- i ]
嘌呤合成了-5(4 H)-1,并在放射性
配体结合测定中进行了评估,以确定它们在人A 1,A 2A和A 3
腺苷受体上的亲和力。还通过c
AMP实验评估了在hA 2B AR上的功效和在hA 3 AR上所选
配体的拮抗作用。所有合成的分子在hA 3 AR上均表现出高亲和力(K i值范围为1.46至44.8 nM),并且相对于A 1具有显着的选择性。,A 2A和A 2B AR子类型。化合物(R)-4-烯丙基-8-乙基-7,8-二氢-2-(3-甲氧基-1-甲基-1H-
吡唑-5-基)-
1H-咪唑[2,1- i发现] purin-5(4 H)-one(R - 33)是该系列中最有效和选择性最高的
配体(K i hA 3 = 1.46 nM,K i hA 2A / K i hA