Synthesis and Structure−Activity Relationships of 1-Phenyl-1H-1,2,3-triazoles as Selective Insect GABA Receptor Antagonists
摘要:
To study the interaction of phenylheterocycles with gamma-aminobutyric acid (GABA) receptors, 4- or 5-alkyl(or phenyl)-1-phenyl-1 H-1,2,3-triazoles were synthesized and examined for their ability to inhibit the specific binding of [H-3]-4'-ethynyl-4-n-propylbicycloorthobenzoate (EBOB), a noncompetitive antagonist, to the housefly and rat GABA receptors, as well as to the beta 3 subunit homo-oligomer of the human GABA receptor investigated as a model receptor. 4-Substituted 1-phenyl-1 H-1,2,3-triazoles were found to be more potent competitive inhibitors than the 5-substituted regioisomers in the case of all receptors. The 4-tert-butyl or 4-n-propyl analogue of 1-(2,6-dichloro-4-trifluoromethylphenyl)1 H-1,2,3-triazole exhibited the highest level of inhibition of [H-3]EBOB binding to all receptors. Most of the synthesized analogues were more active in terms of the inhibition of EBOB binding to the housefly and human beta 3 GABA receptors than to the rat receptor. The 4-cyclohexyl analogue showed the highest (185-fold) housefly versus rat receptor selectivity. A three-dimensional quantitative structure-activity relationship (3D-QSAR) analysis demonstrated that both the 4-trifluoromethyl-2,6dichloro substitution on the phenyl ring and a small, bulky, hydrophobic substituent at the 4-position of the triazole ring played significant roles in conferring high potency in cases involving the housefly and human beta 3 receptors. The human beta 3 receptor resembled the housefly receptor in terms of their recognition of phenyltriazoles, whereas 3D-QSAR analysis revealed a slight difference between the two receptors in terms of their mechanisms of recognition of the para-substituent on the phenyl moiety. Some of the triazoles synthesized here exhibited insecticidal activity, which was correlated with their ability to inhibit [H-3]EBOB binding to the housefly receptor. Thus, 1-phenyl-1 H-1,2,3-triazoles with the appropriate substituents exert insecticidal activity by selectively acting at the site for noncompetitive antagonism of insect GABA receptors.
DOI:
10.1021/jf052773i
作为产物:
描述:
1-叠氮基-4-溴苯 、 1-己炔 在
nickel oxide supported on rice hulk derived silica catalyst 作用下,
以
水 为溶剂,
反应 10.0h,
以57%的产率得到1-(4-bromophenyl)-4-butyl-1H-[1,2,3]triazole
Benedict's solution/ vitamin C: An alternative catalytic protocol for the synthesis of regioselective-1,4-disubstituted-<i>1H</i>
-1,2,3-triazoles at room temperature
作者:Manashjyoti Konwar、Roktopol Hazarika、Abdul A. Ali、Mitali Chetia、Nageshwar D. Khupse、Prakash J. Saikia、Diganta Sarma
DOI:10.1002/aoc.4425
日期:2018.8
A novel and highly efficient method for the synthesis of 1,4‐disubstituted‐1H‐1,2,3‐triazoles by copper‐catalyzed azide‐alkyne cycloaddition has been developed. This economic and sustainable protocol uses a readily available Benedict's solution/Vitamin C catalyst system affording a wide range of 1,4‐disubstituted‐1H‐1,2,3‐triazoles under mild conditions.
(DHQD)<sub>2</sub>PHAL ligand-accelerated Cu-catalyzed azide–alkyne cycloaddition reactions in water at room temperature
作者:Abdul Aziz Ali、Mitali Chetia、Prakash J. Saikia、Diganta Sarma
DOI:10.1039/c4ra12572j
日期:——
Herein, we have described, a ‘Click Chemistry’ protocol for the rapid synthesis of 1,2,3-triazoles in water. (DHQD)2PHAL has been found to be an excellent accelerating ligand for the copper(I)-catalyzed azide–alkynecycloaddition reaction under air. The procedure is simple, efficient, environmentally-friendly and the products were isolated in excellent yields with high purity.
Facile route for the regioselective synthesis of 1,4-disubstituted 1,2,3-triazole using copper nanoparticles supported on nanocellulose as recyclable heterogeneous catalyst
作者:Mitali Chetia、Abdul A Ali、Ankur Bordoloi、Diganta Sarma
DOI:10.1007/s12039-017-1318-y
日期:2017.8
AbstractIn this work, a green and efficient methodology has been developed for the synthesis of 1,2,3-triazoles by ‘copper nanoparticles supported on nanocellulose (CuNPs/NC)-catalyzed azide-alkyne cycloaddition reaction in glycerol, an environmentally benign solvent, with excellent yields. The present catalyst was characterized by TEM, XRD, SEM-EDX and FT-IR spectroscopy. The reusability of the prepared
AgN(CN)2/DIPEA/H2O-EG: a highly efficient catalytic system for synthesis of 1,4-disubstituted-1,2,3 triazoles at room temperature
作者:Abdul Aziz Ali、Mitali Chetia、Bishwajit Saikia、Prakash J. Saikia、Diganta Sarma
DOI:10.1016/j.tetlet.2015.09.025
日期:2015.10
A novel, efficient and robust method for silver-catalyzed azide-alkyne cycloaddition (AgAAC) reactions in H2O/Ethylene glycol (EG) at room temperature has been developed. The protocol addresses silver dicyanamide/DIPEA as a highly effective catalyst system for the regioselective formation of 1,4-disubstituted-1,2,3 triazoles under mild conditions. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis and Structure−Activity Relationships of 1-Phenyl-1<i>H</i>-1,2,3-triazoles as Selective Insect GABA Receptor Antagonists
To study the interaction of phenylheterocycles with gamma-aminobutyric acid (GABA) receptors, 4- or 5-alkyl(or phenyl)-1-phenyl-1 H-1,2,3-triazoles were synthesized and examined for their ability to inhibit the specific binding of [H-3]-4'-ethynyl-4-n-propylbicycloorthobenzoate (EBOB), a noncompetitive antagonist, to the housefly and rat GABA receptors, as well as to the beta 3 subunit homo-oligomer of the human GABA receptor investigated as a model receptor. 4-Substituted 1-phenyl-1 H-1,2,3-triazoles were found to be more potent competitive inhibitors than the 5-substituted regioisomers in the case of all receptors. The 4-tert-butyl or 4-n-propyl analogue of 1-(2,6-dichloro-4-trifluoromethylphenyl)1 H-1,2,3-triazole exhibited the highest level of inhibition of [H-3]EBOB binding to all receptors. Most of the synthesized analogues were more active in terms of the inhibition of EBOB binding to the housefly and human beta 3 GABA receptors than to the rat receptor. The 4-cyclohexyl analogue showed the highest (185-fold) housefly versus rat receptor selectivity. A three-dimensional quantitative structure-activity relationship (3D-QSAR) analysis demonstrated that both the 4-trifluoromethyl-2,6dichloro substitution on the phenyl ring and a small, bulky, hydrophobic substituent at the 4-position of the triazole ring played significant roles in conferring high potency in cases involving the housefly and human beta 3 receptors. The human beta 3 receptor resembled the housefly receptor in terms of their recognition of phenyltriazoles, whereas 3D-QSAR analysis revealed a slight difference between the two receptors in terms of their mechanisms of recognition of the para-substituent on the phenyl moiety. Some of the triazoles synthesized here exhibited insecticidal activity, which was correlated with their ability to inhibit [H-3]EBOB binding to the housefly receptor. Thus, 1-phenyl-1 H-1,2,3-triazoles with the appropriate substituents exert insecticidal activity by selectively acting at the site for noncompetitive antagonism of insect GABA receptors.