Selective reversible and irreversible ligands for the .kappa. opioid receptor
作者:Chen Yu Cheng、Shou Chien Wu、Ling Wei Hsin、S. William Tam
DOI:10.1021/jm00090a015
日期:1992.6
(+/-)-(5-beta,7-alpha,8-beta)-3,4-Dichloro-N-methyl-N-[3-methylene-2-oxo-8-L(1-pyrrolidinyl)-1-oxaspiro[4,5]dec-7-yl]benzeneacetamide (14) and its (5-alpha,7-alpha,8-beta) diastereomer 15 have been synthesized from 1,4-cyclohexanedione monoethylene ketal (1) in 10 steps. Compound 14, which we have designated SMBU-1, was found to bind with moderate affinity (K(i) = 109 nM) and good selectivity (mu/kappa = 29) to the kappa-opioid receptor, while 15 was only 1/10 as potent as a kappa-ligand. Preincubation of brain membranes with 14 resulted in wash-resistant inhibition of kappa-receptor binding (69 +/- 6% of control at 10(-6) M). The ketone precursor trans-N-methyl-N-[5-oxo-2-(1-pyrrolidinyl)cyclohexyl]benzeneacetamide (12) showed a higher kappa-affinity (K(i) = 78 nM) and a much higher kappa-selectivity (mu/kappa = 166) than 14. Compound 10, the ethylene ketal precursor of 12, exhibited a similar receptor binding profile to 14, with increased kappa-selectivity (mu/kappa = 55), while ketal 11, being a regioisomer of 10 and an oxygen isostere of the kappa-selective analgesic spiradoline (U-62,066), demonstrated the highest kappa-affinity (K(i) = 1.5 nM) and kappa-selectivity (mu/kappa = 468) observed in this series.
(+/-)-(5-β,7-α,8-β)-3,4-二氯-N-甲基-N-[3-甲基亚乙基-2-氧-8-L(1-吡咯烷基)-1-氧杂螺[4,5]癸-7-基]苯乙酰胺(14)及其(5-α,7-α,8-β)差向异构体15,已从1,4-环己烷二酮的单乙烯缩酮(1)在10步反应中合成。化合物14,我们将其命名为SMBU-1,发现其与κ阿片受体具有中等亲和力(K(i) = 109 nM)和良好选择性(mu/kappa = 29),而15仅是14的十分之一效力作为κ配体。将脑膜与14预孵育导致κ受体结合的耐洗脱抑制(10(-6) M时为对照的69 ± 6%)。酮前体反式-N-甲基-N-[5-氧-2-(1-吡咯烷基)环己基]苯乙酰胺(12)显示出比14更高的κ亲和力(K(i) = 78 nM)和显著更高的κ选择性(mu/kappa = 166)。化合物10,是12的乙烯缩酮前体,表现出与14相似的受体结合特性,但κ选择性增加(mu/kappa = 55),而ketal 11,作为10的区域异构体,且是κ选择性镇痛药spiradoline(U-62,066)的氧等位体,展示了该系列中最高的κ亲和力(K(i) = 1.5 nM)和κ选择性(mu/kappa = 468)。