Salicylamide derivatives related to medroxalol with .alpha.- and .beta.-adrenergic antagonist and antihypertensive activity
摘要:
Analogues of medroxalol (1) were prepared in which the carboxamide function, the phenolic hydroxy group, and the aralkylamine side chain were modified. N-alkyl-substituted amide analogues of 1 showed diminishing beta-blocking activity with increasing steric bulk of the alkyl group. This allowed the conclusion that deactivation of the phenolic hydroxy group of 1 by the carbonyl group of the amide function is responsible for the beta-adrenergic antagonistic properties of 1. This conclusion was strengthened by the finding that the phenolic O-methyl analogue 5-[2-[[3-(1,3-benzodioxol-5-yl)-1-methylpropyl]amino]-1hydroxyethyl]-2-methoxybenzamide (13) was found to have enhanced beta-adrenergic blocking activity. The finding that 13 also had decreased alpha-blocking activity compared to 1 indicated that the phenolic hydroxy group of 1 enhances alpha-adrenergic antagonism. The finding that 1 and 13 showed such a large difference in relative alpha- to beta-blocking potency while exhibiting approximately equal antihypertensive activity in spontaneously hypertensive rats was surprising. In indicated that pharmacologic properties other than alpha- and beta-adrenergic blockade may contribute to the antihypertensive activity of medroxalol. One of the analogues in which the aralkylamine side chain of 1 was replaced by a fragment of a known alpha-adrenergic receptor blocker, 2-hydroxy-5-[1-hydroxy-2-[4-(2-methylphenyl)-1-piperazinyl]ethyl]benzamide (22), showed an interesting pharmacologic profile of potential therapeutic usefulness.
Copper(II)-faciliated synthesis of substituted thioethers and 5-substituted 1H-tetrazoles: Experimental and theoretical studies
作者:Samaresh Layek、Bhumika Agrahari、Shuvankar Dey、Rakesh Ganguly、Devendra D. Pathak
DOI:10.1016/j.jorganchem.2019.06.008
日期:2019.9
thermo-gravimetric (TG) analysis and Cyclic Voltammetry. The molecular structures of both complexes have also been determined by single crystal X-ray crystallography, which confirmed the coordination of Schiffbase ligands through N, O donor atoms and distorted square planar geometry around the Cu(II) ion. Both complexes were found to be good homogeneous catalysts for the synthesis of a wide range of substituted
Coupling of <i>N</i>-tosylhydrazones with tetrazoles: synthesis of 2-β-<scp>d</scp>-glycopyranosylmethyl-5-substituted-2<i>H</i>-tetrazole type glycomimetics
作者:Tímea Kaszás、Ivett Cservenyák、Éva Juhász-Tóth、Andrea E. Kulcsár、Paola Granatino、Ulf J. Nilsson、László Somsák、Marietta Tóth
DOI:10.1039/d0ob02248a
日期:——
The first tosylhydrazone-tetrazole coupling provides a straightforward access to a new type of glycomimetics with exclusive regioselectivity.
第一次甲磺酰肼-四唑偶联反应为一种具有独特区域选择性的新型糖类模拟物提供了一种直接途径。
Anchoring of Cu(II)-vanillin Schiff base complex on MCM-41: A highly efficient and recyclable catalyst for synthesis of sulfides and 5-substituted 1<i>H</i>
-tetrazoles and oxidation of sulfides to sulfoxides
A copper(II)–vanillin complex was immobilized onto MCM‐41 nanostructure and was used as an inexpensive, non‐toxic and heterogeneous catalyst in the synthesis of symmetric aryl sulfides by the cross‐coupling of aromatic halides with S8 as an effective sulfur source, in the oxidation of sulfides to sulfoxides using 30% H2O2 as a green oxidant and in the synthesis of 5‐substituted 1H–tetrazoles from a
铜(II)-香兰素络合物被固定在MCM-41纳米结构上,并且通过芳族卤化物与S 8作为有效硫的交叉偶联,被用作廉价,无毒且非均相的对称芳基硫化物的合成催化剂来源,包括使用30%H 2 O 2作为绿色氧化剂将硫化物氧化为亚砜,以及将有机腈与叠氮化钠(NaN 3)平稳(3 + 2)环加成合成5取代的1 H-四唑。)。获得的产物具有良好至优异的产率。该催化剂可以重复使用几次而不会损失活性。使用傅里叶变换红外光谱,能量色散X射线和原子吸收光谱,X射线衍射,热重分析以及扫描和透射电子显微镜对催化剂进行表征。
Synthesis and crystal structures of salen-type Cu(<scp>ii</scp>) and Ni(<scp>ii</scp>) Schiff base complexes: application in [3+2]-cycloaddition and A<sup>3</sup>-coupling reactions
作者:Bhumika Agrahari、Samaresh Layek、Rakesh Ganguly、Devendra D. Pathak
DOI:10.1039/c8nj01718b
日期:——
synthesis of two new salen-type Schiff base complexes of the type [Cu(L)]·0.5H2O, 1, and [Ni(L)], 2, from the reaction of a 6,6′-[(1E,1′E)-(cyclohexane-1,2-diylbis(azanylylidene))bis(methanylylidene)bis(3-(diethylamino)phenol)] salen-type Schiff base ligand (H2L) with Cu(OAc)2·H2O and Ni(OAc)2·4H2O in methanol at room temperature, respectively, is described. The complexes are isolated as coloured crystalline
的类型的两个新的沙仑型席夫碱配合物[铜(L)]·0.5H的合成2 O,1,和[镍(L)],2,从的6,6'的反应- [( 1 ë,1' ë) - (环己烷-1,2-二基二(azanylylidene))双(methanylylidene)双(3-(二乙基氨基)苯酚)]沙仑型席夫碱配体(H 2 L)与铜(OAC)2 ·H 2 O和Ni(OAc)2 ·4H 2描述了分别在室温下在甲醇中的O。将该配合物分离为有色结晶固体,并通过元素分析,FT-IR光谱,UV-可见光谱和单晶X射线衍射研究对其进行表征。具有g iso = 2.076的配合物1的顺磁性质已通过EPR研究得到证实,这表明配合物的方形平面几何形状发生了扭曲。与此相反,发现镍络合物本质上是抗磁性的,并且另外通过1 H NMR表征。配合物1和2的晶体结构证实了两种配合物的扭曲的正方形平面几何形状。综合大楼1被发现是一种较好的催化剂,可通过[3
Unprecedented formation of a μ -oxobridged polymeric copper(II) complex: Evaluation of catalytic activity in synthesis of 5-substituted 1 H -tetrazoles
作者:Samaresh Layek、Rakesh Ganguly、Devendra D. Pathak
DOI:10.1016/j.jorganchem.2018.06.004
日期:2018.9
(hmdpH), in 1:1 molar ratio led to a novel and unprecedented oxo-bridged polymeric copper (II) complex, [Cu(μ-O) (hmdp)]n. The complex was isolated as crystalline solid and characterized by FTIR, UV–visible and EPRspectroscopic techniques. The molecular structure of the complex was also determined by single crystal X-ray diffraction studies. The formation of the complex is unique and unprecedented