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首页> 外文期刊>Journal of chemical crystallography >X-ray structures of new substituted 2-(pyrazol-1-yl)-2 '-nitroacetanilides with pharmacological activity
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X-ray structures of new substituted 2-(pyrazol-1-yl)-2 '-nitroacetanilides with pharmacological activity

机译:具有取代作用的新的2-(吡唑-1-基)-2'-硝基乙酰苯胺的X射线结构

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The X-ray structures of four pharmacologically active lidocaine analogs, containing substituted pyrazole moieties as the basic residue and an o-nitrophenyl moiety as the hydrophobic residue, have been determined. They are 2-(pyrazol-1-yl)-2'-nitroacetanilide (1), 2-(3,5-dimethyl-pyrazol-1-yl)-20-nitroacetanilide (2), 2-(3,5-dimethyl-4-iodo-pyrazol-1yl)-20-nitroacetanilide (3), and 2-(3,5-dimethyl-4-nitro-pyrazol-1-yl)-20-nitroacetanilide ( 4). Crystal data are 1: space group Pn with a = 4.6944(1), b = 22.3890(3), c = 15.7481(2) Angstrom, beta = 96.810(1)degrees, Z = 6; 2: P (1) over bar 1 with a D 4: 7277( 2), b D 11: 6878( 5), c D 12.0355(6) Angstrom, alpha = 87.689(2), beta = 85.048(2), gamma = 85.975(2)degrees, Z = 2; 3: I2/a with a = 24.108(5), b = 4.7321(9), c = 25.337(5) Angstrom, beta = 96.09(3)degrees, Z = 8; 4: P2(1) with a = 5.7788(2), b = 8.9844(3), c = 14.0304(5) Angstrom beta = 101.611(1)degrees, Z = 2. Molecules of compound 1 adopt a unique, folded conformation stabilized by intramolecular hydrogen bonds and the crystal structure lacks significant intermolecular interactions. In contrast, molecules of 2-4 adopt common, extended conformations and their crystal structures are based on linear arrays of hydrogen bonded (N-H...O= C) molecules. Compound 3 displayed the highest local anesthetic activity while 2 was the most active in tests for anti-arrhythmic effects.
机译:已经确定了四种具有药理活性的利多卡因类似物的X射线结构,这些类似物含有取代的吡唑部分作为基本残基,而邻硝基苯基部分作为疏水残基。它们是2-(吡唑-1-基)-2'-硝基乙酰苯胺(1),2-(3,5-二甲基-吡唑-1-基)-20-硝基乙酰苯胺(2),2-(3,5-二甲基-4-碘-吡唑-1-基)-20-硝基乙酰苯胺(3)和2-(3,5-二甲基-4-硝基-吡唑-1-基)-20-硝基乙酰苯胺(4)。晶体数据为1:空间群Pn,a = 4.6944(1),b = 22.3890(3),c = 15.7481(2)埃,beta = 96.810(1)度,Z = 6; 2:在小节1上的P(1),其D 4:7277(2),b D 11:6878(5),c D 12.0355(6)埃,alpha = 87.689(2),beta = 85.048(2), γ= 85.975(2)度,Z = 2; 3:I 2 /a,a=24.108(5),b=4.7321(9),c=25.337(5)埃,β= 96.09(3)度,Z = 8。 4:P2(1),a = 5.7788(2),b = 8.9844(3),c = 14.0304(5)埃贝塔= 101.611(1)度,Z =2。化合物1的分子采用独特的折叠构象。通过分子内氢键稳定,晶体结构缺乏明显的分子间相互作用。相反,2-4分子采用共同的扩展构象,其晶体结构基于氢键(N-H ... O = C)分子的线性阵列。在抗心律不齐作用测试中,化合物3表现出最高的局部麻醉活性,而化合物2最活跃。

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