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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Crystallographic and molecular mechanics study of imidooxy anticonvulsants
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Crystallographic and molecular mechanics study of imidooxy anticonvulsants

机译:亚胺氧基抗惊厥药的晶体学和分子力学研究

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摘要

X-ray crystal structures have been determined of five compounds closely related to N-benzyl-2-azaspiro[4.4]-nonane-1,3-dione (1), which is inactive as an anti-convulsant, and N-(benzyloxy)-2-azaspiro[4.4]nonane-1,3-dione (2), which is active. Conformational analyses have been carried out with (1), (2) and the new compounds N-(2',4'-dichlorobenzyloxy)-2-azaspiro[4.4]-nonane-1,3-dione (3), N-(2'-bromobenzyloxy)-2-azaspiro[4.4]nonane-1,3-dione (4), N-(4'-(trifluoromethyl)benzyloxy)-2-azaspiro[4.4]nonane-1,3-dione (5), which are all active anticonvulsants, and N-(4'-chlorobenzyloxy)-2-azaspiro[4.4]nonane-1,3-dione (6) and N-(4'-bromobenzyloxy)-2-azaspiro[4.4]nonane-1,3-dione (7), which are inactive. Regardless of the substitution pattern, the conformations of compounds (2)-(7) in the crystals are very similar. Among the low-energy conformations, which are well distributed in the conformational space, that present in its solid state is dominant. Ortho-substitution considerably cuts down the number of conformations accessible within the set energy limit. The results of these studies alone do not explain the differences in activity.
机译:已经确定了与N-苄基-2-氮杂螺[4.4]-壬烷-1,3-二酮(1)(作为抗惊厥药无效)和N-(苄氧基)密切相关的五种化合物的X射线晶体结构)-2-氮杂螺[4.4]壬烷-1,3-二酮(2),具有活性。用(1),(2)和新化合物N-(2',4'-二氯苄氧基)-2-氮杂螺[4.4]-壬烷-1,3-二酮(3),N- (2'-溴苄氧基)-2-氮杂螺[4.4]壬烷-1,3-二酮(4),N-(4'-(三氟甲基)苄氧基)-2-氮杂螺[4.4]壬烷-1,3-二酮( 5),它们都是活性抗惊厥药,和N-(4'-氯苄氧基)-2-氮杂螺[4.4]壬烷-1,3-二酮(6)和N-(4'-溴苄氧基)-2-氮杂螺[4.4 ] nonane-1,3-dione(7),它是不活泼的。无论取代模式如何,晶体中化合物(2)-(7)的构型都非常相似。在构象空间中分布良好的低能构象中,以固态存在的低能构象占主导地位。邻位取代大大减少了在设定的能量极限内可达到的构象数量。仅这些研究的结果并不能解释活动的差异。

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