88965-00-8Relevant academic research and scientific papers
Synthetic method of imidazopyridine compounds
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Paragraph 0056; 0069-0071, (2021/03/24)
The invention provides a novel method for synthesizing imidazopyridine compounds. According to the invention, aminopyridine compounds and sulfur ylide are used as original reaction substrates, iron phthalocyanine (FeIIPc) is used as a catalyst, and a series of the imidazopyridine compounds are obtained under the condition that the advantages of mildness, greenness, high efficiency, wide substrateuniversality and the like are achieved.
Synthesis and Structure?Activity Relationships of Imidazopyridine/Pyrimidine- and Furopyridine-Based Anti-infective Agents against Trypanosomiases
Silva, Daniel G.,Junker, Anna,de Melo, Shaiani M. G.,Fumagalli, Fernando,Gillespie, J. Robert,Molasky, Nora,Buckner, Frederick S.,Matheeussen, An,Caljon, Guy,Maes, Louis,Emery, Flavio S.
supporting information, p. 966 - 975 (2020/12/04)
Neglected tropical diseases remain among the most critical public health concerns in Africa and South America. The drug treatments for these diseases are limited, which invariably leads to fatal cases. Hence, there is an urgent need for new antitrypanosomal drugs. To address this issue, a large number of diverse heterocyclic compounds were prepared. Straightforward synthetic approaches tolerated pre-functionalized structures, giving rise to a structurally diverse set of analogs. We report on a set of 57 heterocyclic compounds with selective activity potential against kinetoplastid parasites. In general, 29 and 19 compounds of the total set could be defined as active against Trypanosoma cruzi and T. brucei brucei, respectively (antitrypanosomal activities 10 μM). The present work discusses the structure?activity relationships of new fused-ring scaffolds based on imidazopyridine/pyrimidine and furopyridine cores. This library of compounds shows significant potential for anti-trypanosomiases drug discovery.
Design, synthesis and anticancer activity of sulfenylated imidazo-fused heterocycles
Chitrakar, Ravi,Rawat, Deepa,Sistla, Ramakrishna,Subbarayappa, Adimurthy,Vadithe, Lakshma Nayak
supporting information, (2021/08/13)
We report herein, the design, synthesis and study of anticancer properties of sulfenylated 2-phenylimidazo[1,2-a]pyridines and their analogues. A set of twenty sulfenylated imidazo[1, 2-a]pyridine derivatives were synthesized. Whereby elusive amendments to the imidazo[1,2-a]pyridine motif confer dramatic changes in functional affinity of a novel action to modulate anticancer activity in seven different human cancer cell lines i.e.: MDA MB 231 (breast), HepG2 (liver), Hela (cervical), A549 (lung), U87MG (glioblastoma), SKMEL-28 (skin melanoma) and DU-145 (prostate) by employing MTT assay. Among the series, compounds 4e (naphthalene), 4f (styrene) and 4h (thiomethyl) showed potent activity towards human liver cancer cells HepG2. Cell cycle analysis results revealed that these compounds arrested the cell cycle at G2/M phase and induced apoptosis in human liver cancer cells HepG2. It was further confirmed by Hoechst staining, Measurement of mitochondrial membrane potential (ΔΨm) and Annexin V-FITC assay.
Study on a three-step rapid assembly of zolpidem and its fluorinated analogues employing microwave-assisted chemistry
Fajkis, Nikola,Gryzlo, Beata,Kolaczkowski, Marcin,Krupa, Anna,Marcinkowska, Monika
, (2020/08/24)
We developed an efficient microwave-assisted three-step synthesis of zolpidem and its fluorinated analogues 1-3. The procedure relays on the utilization of easily accessible and inexpensive starting materials. Our protocol shows superior performance in terms of yield and purity of products, compared to conventional heating systems. Notably, the total time needed for reaction accomplishment is significantly lower comparing to oil bath heating systems. Finally, we have performed a detailed study on the preparation of zolpidem tartrate salt I, and we assessed its particle-sizes using a polarizing microscope. Our goal was to select the appropriate method that generates the acceptable particle-size, since the solid-size directly influences solubility in biological fluids and further bioavailability. We believe that the disclosed procedure will help to produce a lab-scale quantity of zolpidem and its fluorinated derivatives 1-3, as well as zolpidem tartrate salt I, with suitable fine-particle size for further biological experimentation.
Design, one-pot green synthesis and antimicrobial evaluation of novel imidazopyridine bearing pyran bis-heterocycles
Thakur, Ashima,Pereira, Gavin,Patel, Chetananda,Chauhan, Vinita,Dhaked, Ram Kumar,Sharma, Abha
, (2020/01/23)
Herein, we report design, one pot synthesis and antibacterial evaluation of novel imidazopyridine bearing pyran bis-heterocycles. The compounds were synthesized in an aqueous solution of gluconic acid under both conventional heating and ultrasound irradiation. The target compounds were obtained in good to moderate yields with yield of 65–88% in 20–60 min under ultrasonic irradiation. The compounds were characterized by spectroscopic methods IR, 1H NMR, 13C NMR, MS and HRMS. X-ray single crystal structure of 7i was also determined. The compounds were evaluated for antibacterial activity by measuring zone of inhibition using disk diffusion method that revealed that some compounds were inhibiting the growth of Gram +ve and Gram -ve bacteria. Result of minimum inhibitory concentration (MIC) showed that 7a, 7h & 7k from a series 7a-7k inhibited the growth of S. aureus. The minimum bactericidal concentration (MBC) value was determined for 7a, 7h & 7k. MBC/MIC ratio of the derivatives 7a, 7k & 7h suggest former two derivatives act as bactericidal agent & later act as bacteriostatic agents against Gram +ve bacteria. Haemolysis results showed that compounds are non-cytotoxic to erythrocytes.
Application of Imidazopyridine Derivatives in Regenerative Medicine
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Paragraph 0010; 0237; 0239, (2020/03/09)
A method of producing a pluripotent stem cell is provided. The method is comprising contacting a non-pluripotent donor cell obtained from a mammalian donor with a compound characterized by general formulas (1) and (3). Furthermore, methods for inducing OCT4 and NANOG, increasing histone 3 lysine methylation and the maintenance of pluripotency are provided.
Multicomponent Synthesis of Imidazo[1,2- a]pyridines: Aerobic Oxidative Formation of C-N and C-S Bonds by Flavin-Iodine-Coupled Organocatalysis
Okai, Hayaki,Tanimoto, Kazumasa,Ohkado, Ryoma,Iida, Hiroki
supporting information, p. 8002 - 8006 (2020/11/02)
Herein, we report an aerobic oxidative C-N bond-forming process that enables the facile synthesis of imidazo[1,2-a]pyridines and takes advantage of a coupled organocatalytic system that uses flavin and iodine. Furthermore, the dual catalytic system can be applied to the one-pot, three-step synthesis of 3-thioimidazo[1,2-a]pyridines from aminopyridines, ketones, and thiols.
A simple and efficient route to 2-arylimidazo[1,2-a]pyridines and zolimidine using automated grindstone chemistry
Das, Dharmendra,Bhutia, Zigmee T.,Panjikar, Padmini C.,Chatterjee, Amrita,Banerjee, Mainak
supporting information, p. 4099 - 4107 (2020/09/09)
A green and efficient mechanochemical method for the synthesis of a series of 2-arylimidazo[1,2-a]pyridines was developed using an electrical grinder. I2 catalyzed mechanochemical grinding facilitates the cyclocondensation reaction between various aryl methyl ketones and 2-aminopyridines to afford 2-arylimidazo[1,2-a]pyridines in good yields at ambient temperature. The method was successfully used for the gram-scale synthesis of a marketed drug, zolimidine. The noticeable advantages of this environmentally sustainable protocol include mild conditions, simple instrumentation, inexpensive catalyst, atom economy, short reaction time etc.
Iodide-Catalyzed Phosphorothiolation of Heteroarenes Using P(O)H Compounds and Elemental Sulfur
Shi, Shanshan,Chen, Jun,Zhuo, Shaohua,Wu, Zi'ang,Fang, Meijuan,Tang, Guo,Zhao, Yufen
supporting information, p. 3210 - 3216 (2019/05/16)
Organothiophosphates have found widespread application as biologically active compounds and synthetic intermediates in medicinal chemistry. The first transition-metal-free one-pot direct synthesis of heterocyclic phosphorothioates involving indole or imidazo[1,2-a]pyridine derivatives, elemental sulfur, and P(O)H compounds is presented. The use of NaI or KI as a catalyst, tert-butyl hydroperoxide as an oxidant, various indole and imidazo[1,2-a]pyridine derivatives are tolerant in this transformation, affording the corresponding products in good to excellent yields. Moreover, this method can be easily adapted to large-scale preparation. O,O-Diethyl S-(1-phenyl-1H-indol-3-yl) phosphorothioate presents potent anti-inflammatory activity in lipopolysaccharide (LPS)-stimulated RAW264.7 cells in a dose-dependent manner. (Figure presented.).
Formation of Methylene Linkage for N-Heterocycles: Sequential C-H and C-O Bond Functionalization of Methanol with Cosolvent Water
Li, Na,Bai, Jinku,Zheng, Xiaolin,Rao, Honghua
, p. 6928 - 6939 (2019/06/14)
An iron-catalyzed methylene forming strategy is disclosed through sequential C-H and C-O bond functionalization of methanol with cosolvent water. This protocol provides an easy and novel access to methylene-tethered imidazo[1,2-a]pyridine and 2-aminopyridine analogues in a sustainable manner and represents a complementary approach to traditional methylene forming strategies.
