5946-43-0Relevant academic research and scientific papers
Structural basis of binding and justification for the urease inhibitory activity of acetamide hybrids of N-substituted 1,3,4-oxadiazoles and piperidines
Abbasi, Muhammad Athar,Afridi, Sahib Gul,Khan, Ajmal,Khan, Asifullah,Khan, Farman Ali,Lodhi, Muhammad Arif,Rehman, Aziz Ur
, (2020/09/18)
In present, we have performed the Michaelis–Menten kinetics studies of urease inhibitors (6a–o), having basic skeleton of acetamide hybrids of N-substituted 1,3,4-oxadiazoles and piperidines. From the Lineweaver-Burk plot, Dixon plot and their secondary replots, it has been confirmed that all the compounds have inhibited the enzyme competitively with Ki values of in range from 3.11 ± 0.2 to 5.20 ± 0.7 μM. Compound 6a was found to have lowest Ki among the series, while compounds 6d, 6e, 6gand 6i were found subsequently the excellent Ki values after 6a. Molecular docking has supported their types of inhibitions and structure activity-relationship. Most frequently, the nitro group oxygen atoms were found in contact with nickel ions of the active site. Moreover, all the compounds were subjected to toxicity tests and were found nontoxic against human neutrophils and plants, respectively.
Novel selective ido1 inhibitors with isoxazolo[5,4-d]pyrimidin-4(5h)-one scaffold
?vajger, Urban,Bratkovi?, Toma?,Dol?ak, Ana,Gobec, Stanislav,Mlinari?, Larisa,Ogorevc, Eva,Sova, Matej
, (2021/04/02)
Indoleamine 2,3-dioxygenase 1 (IDO1) is a promising target in immunomodulation of several pathological conditions, especially cancers. Here we present the synthesis of a series of IDO1 inhibitors with the novel isoxazolo[5,4-d]pyrimidin-4(5H)-one scaffold. A focused library was prepared using a 6-or 7-step synthetic procedure to allow a systematic investigation of the structure-activity relationships of the described scaffold. Chemistry-driven modifications lead us to the discovery of our best-in-class inhibitors possessing p-trifluoromethyl (23), p-cyclohexyl (32), or p-methoxycarbonyl (20, 39) substituted aniline moieties with IC50 values in the low micromolar range. In addition to hIDO1, compounds were tested for their inhibition of indoleamine 2,3-dioxygenase 2 and tryptophan dioxygenase, and found to be selective for hIDO1. Our results thus demon-strate a successful study on IDO1-selective isoxazolo[5,4-d]pyrimidin-4(5H)-one inhibitors, defining promising chemical probes with a novel scaffold for further development of potent small-molecule immunomodulators.
A novel method for the synthesis of 1,2,4-triazole-derived heterocyclic compounds: enzyme inhibition and molecular docking studies
Riaz, Naheed,Iftikhar, Muhammad,Saleem, Muhammad,Aziz-ur-Rehman,Ahmed, Ishtiaq,Ashraf, Muhammad,Shahnawaz,Rehman, Jameel,al-Rashida, Mariya
, p. 1183 - 1200 (2020/01/31)
Two series of new N-aryl/aralkyl derivatives (9a–q) of 2-(4-ethyl-5-(thiophen-2-ylmethyl)-4H-1,2,4-triazol-3-ylthio)acetamide and N-aryl/aralkyl derivatives (10a–q) of 2-(4-phenyl-5-(thiophen-2-ylmethyl)-4H-1,2,4-triazol-3-ylthio)acetamide were synthesized. The methods included successive conversions of thiophen-2-acetic acid (a) into its respective ester, hydrazide and N-aryl/aralkyl 1,3,4-triazole. The target compounds (9a–q; 10a–q) were obtained by the reaction of N-aryl/aralkyl 1,3,4-triazole (5, 6) with various electrophiles, (8a–q), in N,N-dimethyl formamide (DMF) and sodium hydroxide at room temperature. The characterization of these compounds was done by FTIR, 1H-, 13C-NMR, EI-MS and HR-EI-MS spectral data. All compounds were evaluated for their enzyme inhibitory potentials against electric eel acetylcholinesterase, AChE (10f, 10d; IC50 values 32.26 ± 0.12, 45.72 ± 0.11?μM, respectively), equine butyrylcholinesterase, BChE (9d, 9l, 9b, 10d, 10h; IC50 values 12.52 ± 0.19, 12.52 ± 0.19, 21.72 ± 0.18, 23.62 ± 0.22, 24.52 ± 0.21?μM, respectively), jack bean urease (10i, 10n, 9e; IC50 values 7.27 ± 0.05, 7.35 ± 0.04, 8.79 ± 0.05?μM, respectively) and yeast α-glucosidase enzymes (9o, 10i; IC50 values 62.94 ± 0.19, and 69.46 ± 0.15?μM, respectively). The molecular docking studies supported these findings. This study provides cheaper bioactive triazole amides as promising future lead molecules.
Synthesis of Novel Bi-Heterocycles as Valuable Anti-Diabetic Agents: 2-({5-((2-Amino-1,3-Thiazol-4-yl)methyl)-1,3,4-Oxadiazol-2-yl}sulfanyl)-N-(Substituted)acetamides
Aziz-ur-Rehman,Khan, Farman Ali,Lodhi, Muhammad Arif,Mirza, Bushra,Muhammad, Athar Abbasi,Ramzan, Muhammad Shahid,Shah, Syed Adnan Ali,Siddiqui, Sabahat Zahra
, p. 590 - 598 (2020/10/02)
Abstract: The synthesis of a new series of S-substituted acetamides derivatives of 5-[(2-amino-1,3-thiazol-4-yl)methyl]-1,3,4-oxadiazol-2-thiol were synthesized and evaluated for enzyme inhibition study along with cytotoxic behavior. Ethyl 2-(2-amino-1,3-thiazol-4-yl)acetate was converted to corresponding acid hydrazide by hydrazine hydrate in ethanol. The reflux of acid hydrazide with carbon disulfide resulted to 5-[(2-amino-1,3-thiazol-4-yl)methyl]-1,3,4-oxadiazol-2-thiol. Different electrophiles were synthesized by the reaction of respective anilines (one in each reaction) and 2-bromoacetylbromide in an aqueous medium. The targeted bi-heterocyclic compounds were synthesized by stirring nucleophilic 5-[(2-amino-1,3-thiazol-4-yl)methyl]-1,3,4-oxadiazol-2-thiol with different acetamides electrophiles (one after another), in DMF using LiH as base and activator. The proposed structures of newly synthesized compounds were deduced by spectroscopic techniques such as 1H NMR, 13C NMR, EI MS and elemental analysis. These novel bi-heterocycles were tested for their anti-diabetic potential via the in vitro inhibition of α-glucosidase enzyme. The in silico study of these molecules was also coherent with their enzyme inhibition data. Furthermore, these molecules were analyzed for their cytotoxic behavior against brine shrimps. It was inferred from the results that most of them exhibited very potent inhibitory potential against the studied enzyme and can be utilized as valuable anti-diabetic agent.
New indole based hybrid oxadiazole scaffolds with N-substituted acetamides: As potent anti-diabetic agents
Nazir, Majid,Abbasi, Muhammad Athar,Aziz-ur-Rehman,Siddiqui, Sabahat Zahra,Khan, Khalid Mohammed,Kanwal,Salar, Uzma,Shahid, Muhammad,Ashraf, Muhammad,Arif Lodhi, Muhammad,Ali Khan, Farman
, p. 253 - 263 (2018/09/05)
Current study is based on the sequential conversion of indolyl butanoic acid (1) into ethyl indolyl butanoate (2), indolyl butanohydrazide (3), and 1,3,4-oxadiazole-2-thiol analogs (4) by adopting chemical transformations. In a parallel series of reaction
Synthesis of Novel Jusbetonin Analogues and Their Cytotoxicity against Tumor Cell
Liu, Shixu,Meng, Junxiu,Zhang, Wei,Wan, Shengbiao,Jiang, Tao
, p. 1194 - 1199 (2016/07/29)
Six novel analogues of bioactive natural indolo[3,2-b]quinoline alkaloid glycoside jusbetonin were designed and synthesized, employing polyphosphoric acid mediated cyclization and two different amidation strategies on introduction of tetra-O-acetyl-β-d-gl
Antibacterial and enzyme inhibition screening of some new acetamide and azomethine derivatives
Rasool, Shahid,Rehman, Aziz-Ur,Abbasi, Muhammad Athar,Siddiqui, Sabahat Zahra,Shah, Syed Adnan Ali,Ahmad, Irshad,Afzal, Saira
, p. 2704 - 2710 (2016/03/08)
The synthesis of poly-functional moieties as one unit has been under consideration by the synthetic chemists to search out new potent molecules. 2-Chlorobenzoic acid (1) was converted to 5-(2-chlorophenyl)-1,3,4-Oxadiazol-2-thiol (4) through a series of steps. This nucleophile was attached with different electrophiles, prepared by the reaction of aryl/alkyl amines with 2-bromoacetylbromide, in NaH/DMF to synthesize N-substituted-2-((5-(2-chlorophenyl)-1,3,4-Oxadiazol-2- yl)sulfanyl)acetamide, 7a-f. The molecule 4 was stepped to ethyl ester and carbohydrazide. The carbohydrazide was made to react with aryl carboxaldehydes in methanol to synthesize N'-substituted-2-(5-(2-chlorophenyl)-1,3,4-Oxadiazol-2-ylthio)acetohydrazide, 11a-i. The structures of all the molecules were corroborated through IR, 1H-NMR and EI-MS spectral data. Both the series were screened for antibacterial and enzyme inhibition activity.
N-substituted derivatives of 5-(4-chlorophenyl)-1,3,4-oxadiazol-2-yl-2- sulfanyl acetamide as valuable bioactive compounds
Rehman, Aziz-Ur,Gul, Samreen,Abbasi, Muhammad Athar,Nafeesa, Khadija,Siddiqa, Asia,Khan, Khalid Mohammed,Shahid, Muhammad,Subhani, Zinayyera
, p. 503 - 511 (2014/08/05)
In the described research work, a new series of N-substituted derivatives of 5-(4- chlorophenyl)-1,3,4-Oxadiazol-2-yl-2-sulfanyl acetamide has been synthesized. The synthesis was carried out by converting 4-chlorobenzoic acid (1) into ethyl 4-chlorobenzoate (2), 4- chlorobenzohydrazide (3) and then 5-(4-chlorophenyl)-1,3,4-Oxadiazol-2-thiol (4) respectively. The target molecules 6a-o were synthesized by reacting compound 4 with different N-alkyl/aryl substituted 2-bromoacetamide (5a-o) in equimolar ratios of using DMF and sodium hydride (NaH). The structure of all the synthesized compounds was confirmed by spectral data like EI-MS, IR and 1H-NMR. The compounds were also analysed for antimicrobial & hemolytic activity and most of them were found active against the selected microbial species at variable extent relative to reference standards. But 6f and 6o were the active against the selected panel of microbes and former was most potent one. This series revealed less toxicity and may consider for further biological screening and application trial except 6g and 6j, exhibiting high cytotoxicity.
Synthesis, saccharide-binding and anti-cancer cell proliferation properties of arylboronic acid derivatives of indoquinolines
Meng, Junxiu,Yu, Shaoqing,Wan, Shengbiao,Ren, Sumei,Jiang, Tao
experimental part, p. 816 - 825 (2012/06/18)
A facile synthesis of a series of saccharide-binding arylboronic acid derivatives of indoloquinoline was described. The key synthetic steps were polyphosphoric acid-mediated cyclization, chlorinative aromatization, and amidation. Mass spectrometry experim
Peptoid atropisomers
Paul, Bishwajit,Butterfoss, Glenn L.,Boswell, Mikki G.,Renfrew, P. Douglas,Yeung, Fanny G.,Shah, Neel H.,Wolf, Christian,Bonneau, Richard,Kirshenbaum, Kent
supporting information; experimental part, p. 10910 - 10919 (2011/09/30)
We report the isolation of N-aryl peptoid oligomers that adopt chiral folds, despite the absence of chiral centers. Peptoid monomers incorporating ortho-substituted N-aryl side chains are identified that exhibit axial chirality. We observe significant ene
