19056-34-9Relevant academic research and scientific papers
Optimisation of 2-(N-phenyl carboxamide) triazolopyrimidine antimalarials with moderate to slow acting erythrocytic stage activity
Bailey, Brodie L.,Nguyen, William,Ngo, Anna,Goodman, Christopher D.,Gancheva, Maria R.,Favuzza, Paola,Sanz, Laura M.,Gamo, Francisco-Javier,Lowes, Kym N.,McFadden, Geoffrey I.,Wilson, Danny W.,Laleu, Beno?t,Brand, Stephen,Jackson, Paul F.,Cowman, Alan F.,Sleebs, Brad E.
, (2021/08/30)
Malaria is a devastating parasitic disease caused by parasites from the genus Plasmodium. Therapeutic resistance has been reported against all clinically available antimalarials, threatening our ability to control the disease and therefore there is an ongoing need for the development of novel antimalarials. Towards this goal, we identified the 2-(N-phenyl carboxamide) triazolopyrimidine class from a high throughput screen of the Janssen Jumpstarter library against the asexual stages of the P. falciparum parasite. Here we describe the structure activity relationship of the identified class and the optimisation of asexual stage activity while maintaining selectivity against the human HepG2 cell line. The most potent analogues from this study were shown to exhibit equipotent activity against P. falciparum multidrug resistant strains and P. knowlesi asexual parasites. Asexual stage phenotyping studies determined the triazolopyrimidine class arrests parasites at the trophozoite stage, but it is likely these parasites are still metabolically active until the second asexual cycle, and thus have a moderate to slow onset of action. Non-NADPH dependent degradation of the central carboxamide and low aqueous solubility was observed in in vitro ADME profiling. A significant challenge remains to correct these liabilities for further advancement of the 2-(N-phenyl carboxamide) triazolopyrimidine scaffold as a potential moderate to slow acting partner in a curative or prophylactic antimalarial treatment.
Tert-amino effect-promoted rearrangement of aryl isothiocyanate: A versatile approach to benzimidazothiazepines and benzimidazothioethers
Geng, Xinyu,Liu, Siyuan,Qu, Jingping,Wang, Baomin,Wang, Wenyao
, p. 12635 - 12643 (2020/11/09)
A general and practical approach to benzimidazothiazepine and benzimidazothioether derivatives via an intramolecular nucleophilic addition/ring expansion rearrangement of aryl isothiocyanates promoted by the tert-amino effect has been developed. This reaction is catalyzed by low-cost camphorsulfonic acid and tolerates a broad substrate scope with complete atom economy. Structurally intriguing benzimidazothiazepine and benzimidazothioether products could be easily obtained by a simple operation in good to excellent yield (up to 98%).
1,2-Disubstituted Benzimidazoles by the Iron Catalyzed Cross-Dehydrogenative Coupling of Isomeric o-Phenylenediamine Substrates
Foss, Frank W.,Palacios, Philip M.,Pierce, Brad S.,Thapa, Pawan,Tran, Tam
, p. 1991 - 2009 (2020/03/13)
Benzimidazoles are common in nature, medicines, and materials. Numerous strategies for preparing 2-arylbenzimidazoles exist. In this work, 1,2-disubstituted benzimidazoles were prepared from various mono- and disubstituted ortho-phenylenediamines (OPD) by iron-catalyzed oxidative coupling. Specifically, O2 and FeCl3·6H2O catalyzed the cross-dehydrogenative coupling and aromatization of diarylmethyl and dialkyl benzimidazole precursors. N,N′-Disubstituted-OPD substrates were significantly more reactive than their N,N-disubstituted isomers, which appears to be relative to their propensity for complexation and charge transfer with Fe3+. The reaction also converted N-monosubstituted OPD substrates to 2-substituted benzimidazoles; however, electron-poor substrates produce 1,2-disubstituted benzimidazoles by intermolecular imino-transfer. Kinetic, reagent, and spectroscopic (UV-vis and EPR) studies suggest a mechanism involving metal-substrate complexation, charge transfer, and aerobic turnover, involving high-valent Fe(IV) intermediates. Overall, comparative strategies for the relatively sustainable and efficient synthesis of 1,2-disubstituted benzimidazoles are demonstrated.
Zinc Chloride Complexes with Aliphatic and Aromatic Guanidine Hybrid Ligands and Their Activity in the Ring-Opening Polymerisation of d,l-Lactide
Metz, Angela,Plothe, Ramona,Glowacki, Britta,Koszalkowski, Andreas,Scheckenbach, Michael,Beringer, Andreas,R?sener, Thomas,Michaelis de Vasconcellos, Janna,Haase, Roxana,Fl?rke, Ulrich,Hoffmann, Alexander,Herres-Pawlis, Sonja
, p. 4974 - 4987 (2016/11/09)
The synthesis of the new hybrid guanidine ligands DMEGdmap, DMEGdeae, TMGdmab, DMEGdmab, TMGdeab and DMEGdeab is reported. These ligands were combined with zinc chloride, and the six obtained new complexes were structurally characterised by X-ray crystall
Synthesis of benzimidazoles via iridium-catalyzed acceptorless dehydrogenative coupling
Sun, Xiang,Lv, Xiao-Hui,Ye, Lin-Miao,Hu, Yu,Chen, Yan-Yan,Zhang, Xue-Jing,Yan, Ming
, p. 7381 - 7383 (2015/07/15)
Iridium-catalyzed acceptorless dehydrogenative coupling of tertiary amines and arylamines has been developed. A number of benzimidazoles were prepared in good yields. An iridium-mediated C-H activation mechanism is suggested. This finding represents a novel strategy for the synthesis of benzimidazoles.
Synthesis of benzimidazoles via iridium-catalyzed acceptorless dehydrogenative coupling
Sun, Xiang,Lv, Xiao-Hui,Ye, Lin-Miao,Hu, Yu,Chen, Yan-Yan,Zhang, Xue-Jing,Yan, Ming
, p. 7381 - 7383 (2015/11/27)
Iridium-catalyzed acceptorless dehydrogenative coupling of tertiary amines and arylamines has been developed. A number of benzimidazoles were prepared in good yields. An iridium-mediated C-H activation mechanism is suggested. This finding represents a novel strategy for the synthesis of benzimidazoles.
Synthesis, antifungal activity and structure-activity relationships of novel 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic acid amides
Du, Shijie,Tian, Zaimin,Yang, Dongyan,Li, Xiuyun,Li, Hong,Jia, Changqing,Che, Chuanliang,Wang, Mian,Qin, Zhaohai
, p. 8395 - 8408 (2015/05/20)
A series of novel 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic acid amides were synthesized and their activities were tested against seven phytopathogenic fungi by an in vitro mycelia growth inhibition assay. Most of them displayed moderate to excellent activities. Among them N-(2-(5-bromo-1H-indazol-1-yl)phenyl)-3-(difluoro-methyl)-1-methyl-1H-pyrazole-4-carboxamide (9m) exhibited higher antifungal activity against the seven phytopathogenic fungi than boscalid. Topomer CoMFA was employed to develop a three-dimensional quantitative structure-activity relationship model for the compounds. In molecular docking, the carbonyl oxygen atom of 9m could form hydrogen bonds towards the hydroxyl of TYR58 and TRP173 on SDH.
