A series of threo-1-aza-3 or 4-substituted-5-phenyl[4.4.0]decanes (quinolizidines), which were envisioned as restricted rotational analogues (RRAs) of methylphenidate (MP), was synthesized and tested for inhibitory potency against [(3)H]WIN35,428, [3H]citalopram, and [3H]nisoxetine binding to the dopamine, serotonin, and norepinephrine transporters, respectively. Two different synthetic schemes were used; a Wittig reaction or acylation (followed by an intramolecular condensation) was a key feature of each scheme. The unsubstituted RRA, threo(trans)-1-aza-5-phenyl[4.4.0]decane (12a), was equipotent to unconstrained threo-MP against [(3)H]WIN35,428 binding. The extra ring in these RRAs (which reduces the conformational freedom) and the orientation and polarity of substituents at the 4-position on this extra ring are of critical importance to the biological activity. Generally, the RRAs paralleled the corresponding unconstrained MP derivatives in binding affinity to the three transporters. The results suggest that the conformation of MP in which the carbonyl group of the methyl ester is H-bonded to the piperidinyl N-H may be the bioactive form of the molecule.

译文

:合成了一系列的threo-1-aza-3或4-取代的5-苯基[4.4.0]癸烷(喹quin嗪),它们被设想为哌醋甲酯(MP)的限制性旋转类似物(RRA),并对其进行了测试对[(3)H] WIN35,428,[3H]西酞普兰和[3H] nisoxetine分别结合多巴胺,5-羟色胺和去甲肾上腺素转运蛋白的抑制作用。使用了两种不同的合成方案。 Wittig反应或酰化反应(随后是分子内缩合反应)是每种方案的关键特征。未取代的RRA,苏式(反式)-1-氮杂-5-苯基[4.4.0]癸烷(12a),与不受约束的苏式-MP等效于[(3)H] WIN35,428结合。这些RRA中的额外环(降低构象自由度)以及该额外环上4位取代基的方向和极性对于生物活性至关重要。通常,RRA在与三个转运蛋白的结合亲和力上与相应的不受约束的MP衍生物平行。结果表明,其中甲酯的羰基H键合至哌啶基N-H的MP的构象可能是分子的生物活性形式。

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