Design, synthesis and structure–activity relationship of novel quinoxalin-2-carboxamides as 5-HT3 receptor antagonists for the management of depression
摘要:
A novel series of quinoxalin-2-carboxamides were designed based on the ligand-based approach, employing a three-point pharmacophore model; it consists of an aromatic residue and a linking carbonyl group and a basic nitrogen. The target new chemical entities were synthesized from the key intermediate, quinoxalin-2-carboxylic acid, by coupling it with various amines in the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC center dot HCl) and 1-hydroxybenzotriazole (HOBt). The obtained compounds' structures were confirmed by spectral data. The target new chemical entities were evaluated for their 5-HT3 receptor antagonisms in longitudinal muscle myenteric plexus preparation from guinea pig ileum against 5-HT3 agonist, 2-methyl-5-HT, which was expressed in the form of pA(2) value. All the synthesized compounds showed antagonism towards 5-HT3 receptor; based on this result, a structure-activity relationship was derived, which reveals that the aromatic residue in 5-HT3 receptor antagonists may have hydrophobic interaction with 5-HT3 receptor. Regardless of their antagonistic potentials, all the synthesized molecules were screened for their anti-depressant potentials by using forced swim test in mice model; interestingly none of the tested compounds affect the locomotion of mice in the tested dose levels. Compounds with significant pA(2) values exhibited good anti-depressant-like activity as compared to the vehicle-treated group. (C) 2010 Elsevier Ltd. All rights reserved.
Design, synthesis and structure–activity relationship of novel quinoxalin-2-carboxamides as 5-HT3 receptor antagonists for the management of depression
摘要:
A novel series of quinoxalin-2-carboxamides were designed based on the ligand-based approach, employing a three-point pharmacophore model; it consists of an aromatic residue and a linking carbonyl group and a basic nitrogen. The target new chemical entities were synthesized from the key intermediate, quinoxalin-2-carboxylic acid, by coupling it with various amines in the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC center dot HCl) and 1-hydroxybenzotriazole (HOBt). The obtained compounds' structures were confirmed by spectral data. The target new chemical entities were evaluated for their 5-HT3 receptor antagonisms in longitudinal muscle myenteric plexus preparation from guinea pig ileum against 5-HT3 agonist, 2-methyl-5-HT, which was expressed in the form of pA(2) value. All the synthesized compounds showed antagonism towards 5-HT3 receptor; based on this result, a structure-activity relationship was derived, which reveals that the aromatic residue in 5-HT3 receptor antagonists may have hydrophobic interaction with 5-HT3 receptor. Regardless of their antagonistic potentials, all the synthesized molecules were screened for their anti-depressant potentials by using forced swim test in mice model; interestingly none of the tested compounds affect the locomotion of mice in the tested dose levels. Compounds with significant pA(2) values exhibited good anti-depressant-like activity as compared to the vehicle-treated group. (C) 2010 Elsevier Ltd. All rights reserved.
Cationic porphyrin–quinoxaline conjugate as a photochemically triggered novel cytotoxic agent
作者:Dalip Kumar、K.P. Chandra Shekar、Bhupendra Mishra、Ryohsuke Kurihara、Maiko Ogura、Takeo Ito
DOI:10.1016/j.bmcl.2013.03.126
日期:2013.6
A novel cationic porphyrin-quinoxaline conjugate 8 was prepared in good yield by the coupling of activated quinoxaline carboxylic acid 5 with an appropriate aminoporphyrin. The UV-vis spectra of conjugate 8 with the addition of ctDNA shows substantial hypochromicity (39%) and a red shift (12 nm) in the Soret band indicating intercalation and self stacking along the surface. The binding constant of conjugate 8 with ctDNA was determined to be 1.26 x 106 M-1. The porphyrin-quinoxaline conjugate 8 displayed enhanced photocytotoxicity (IC50 = 0.06 mu M) when compared to TMPyP against A549 cancer cells. (C) 2013 Elsevier Ltd. All rights reserved.
Palios, G.; Guskos, N.; Likodimos, V., Polish Journal of Chemistry, 1994, vol. 68, # 12, p. 2519 - 2528
作者:Palios, G.、Guskos, N.、Likodimos, V.、Paraskevas, S. M.、Savvogias, S.、et al.
DOI:——
日期:——
Design, synthesis and structure–activity relationship of novel quinoxalin-2-carboxamides as 5-HT3 receptor antagonists for the management of depression
A novel series of quinoxalin-2-carboxamides were designed based on the ligand-based approach, employing a three-point pharmacophore model; it consists of an aromatic residue and a linking carbonyl group and a basic nitrogen. The target new chemical entities were synthesized from the key intermediate, quinoxalin-2-carboxylic acid, by coupling it with various amines in the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC center dot HCl) and 1-hydroxybenzotriazole (HOBt). The obtained compounds' structures were confirmed by spectral data. The target new chemical entities were evaluated for their 5-HT3 receptor antagonisms in longitudinal muscle myenteric plexus preparation from guinea pig ileum against 5-HT3 agonist, 2-methyl-5-HT, which was expressed in the form of pA(2) value. All the synthesized compounds showed antagonism towards 5-HT3 receptor; based on this result, a structure-activity relationship was derived, which reveals that the aromatic residue in 5-HT3 receptor antagonists may have hydrophobic interaction with 5-HT3 receptor. Regardless of their antagonistic potentials, all the synthesized molecules were screened for their anti-depressant potentials by using forced swim test in mice model; interestingly none of the tested compounds affect the locomotion of mice in the tested dose levels. Compounds with significant pA(2) values exhibited good anti-depressant-like activity as compared to the vehicle-treated group. (C) 2010 Elsevier Ltd. All rights reserved.