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Li H, Yu J, Yu G, Cheng S, Wu H, Wei J, You C, Liu K, Wang M, Meng X, Xu G, Luo H, Xu B. Design and synthesis of N-aryl-2-trifluoromethyl-quinazoline-4-amine derivatives as potential Werner-dependent antiproliferative agents. Mol Divers 2024:10.1007/s11030-024-10844-6. [PMID: 38739229 DOI: 10.1007/s11030-024-10844-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 03/08/2024] [Indexed: 05/14/2024]
Abstract
To discover new Werner (WRN) helicase inhibitors, a series of N-aryl-2-trifluoromethyl-quinazoline-4-amine derivatives were designed and synthesized through a structural optimization strategy, and the anticancer activities of 25 new target compounds against PC3, K562, and HeLa cell lines were evaluated by the MTT assay. Some of these compounds exhibited excellent inhibitory activity against three different cancer cell lines. Compounds 6a, 8i, and 13a showed better antiproliferative activity against K562 cells, with IC50 values of 3871.5, 613.6 and 134.7 nM, respectively, than did paclitaxel (35.6 nM), doxorubicin (2689.0 nM), and NSC 617145 (20.3 nM). To further verify whether the antiproliferative activity of these compounds is dependent on WRN, PC3 cells overexpressing WRN (PC3-WRN) were constructed to further study their antiproliferative potency in vitro, and the inhibition ratio and IC20 values showed that compounds 6a, 8i, and 13a were more sensitive to PC3-WRN than were the control group cells (PC3-NC). The IC20 ratios of compounds 6a, 8i, and 13a to PC3-NC and PC3-WRN were 94.3, 153.4 and 505.5, respectively. According to the docking results, the compounds 6a, 8i, and 13a overlapped well with the binding pocket of 6YHR. Further study demonstrated that among the tested compounds, 13a was the most sensitive to PC3-WRN. In summary, our research identified a series of N-aryl-2-trifluoromethyl-quinazoline-4-amine derivatives as potential WRN-dependent anticancer agents.
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Affiliation(s)
- Huimin Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
- School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang, 550025, China
| | - Jia Yu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
| | - Gang Yu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
| | - Sha Cheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
| | - Hui Wu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
| | - Jiaomei Wei
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
| | - Chang You
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China
| | - Kun Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
| | - Menghan Wang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China
| | - Xueling Meng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China
| | - Guangcan Xu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China.
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China.
| | - Heng Luo
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China.
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China.
| | - Bixue Xu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China.
- Natural Products Research Center of Guizhou Province, Guiyang, 550014, China.
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Strašek Benedik N, Dolšak A, Švajger U, Sosič I, Gobec S, Sova M. Structural Optimization and Biological Evaluation of Isoxazolo[5,4 -d]pyrimidines as Selective Toll-Like Receptor 7 Agonists. ACS OMEGA 2024; 9:2362-2382. [PMID: 38250345 PMCID: PMC10795023 DOI: 10.1021/acsomega.3c06343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 11/30/2023] [Accepted: 12/12/2023] [Indexed: 01/23/2024]
Abstract
Toll-like receptors (TLRs) are components of innate immunity that play a crucial role in several diseases, including chronic inflammatory and infectious diseases, autoimmune diseases, and cancer. In particular, TLR7 has been identified as a key player in the innate immune response against viral infections and small-molecule TLR7 agonists have shown potential for vaccine therapy, for treatment of asthma and allergies, and as anticancer drugs. Inspired by our previous discovery of selective TLR7 agonists, our goal was to develop and introduce a new chemotype of TLR7 agonists by replacing the quinazoline ring with a new heterocycle isoxazolo[5,4-d]pyrimidine. Here, we report design, optimized synthesis, and structure-activity relationship studies of a novel class of TLR7 agonists based on the 6-(trifluoromethyl)isoxazolo[5,4-d]pyrimidine-4-amine scaffold that demonstrate high selectivity and low micromolar potencies. The best-in-class agonist 21a, with an EC50 value of 7.8 μM, also proved to be noncytotoxic and induced secretion of cytokines, including IL-1β, IL-12p70, IL-8, and TNF-α, indicating its potential to modulate the immune response.
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Affiliation(s)
- Nika Strašek Benedik
- Faculty
of Pharmacy, Department of Pharmaceutical Chemistry, University of Ljubljana, Aškerčeva 7, Ljubljana 1000, Slovenia
| | - Ana Dolšak
- Faculty
of Pharmacy, Department of Pharmaceutical Chemistry, University of Ljubljana, Aškerčeva 7, Ljubljana 1000, Slovenia
| | - Urban Švajger
- Faculty
of Pharmacy, Department of Pharmaceutical Chemistry, University of Ljubljana, Aškerčeva 7, Ljubljana 1000, Slovenia
- Blood
Transfusion Centre of Slovenia, Šlajmerjeva 6, Ljubljana 1000, Slovenia
| | - Izidor Sosič
- Faculty
of Pharmacy, Department of Pharmaceutical Chemistry, University of Ljubljana, Aškerčeva 7, Ljubljana 1000, Slovenia
| | - Stanislav Gobec
- Faculty
of Pharmacy, Department of Pharmaceutical Chemistry, University of Ljubljana, Aškerčeva 7, Ljubljana 1000, Slovenia
| | - Matej Sova
- Faculty
of Pharmacy, Department of Pharmaceutical Chemistry, University of Ljubljana, Aškerčeva 7, Ljubljana 1000, Slovenia
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3
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Patra S, Patra P. A Brief Review on the Design, Synthesis and Biological Evaluation of Pyrazolo[ c]coumarin Derivatives. Polycycl Aromat Compd 2023. [DOI: 10.1080/10406638.2023.2181827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- Susanta Patra
- Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - Prasanta Patra
- Department of Chemistry, Jhargram Raj College, Jhargram, WB 721507, India
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Ramiro JL, Neo AG, Marcos CF. Synthesis of imidazolocoumarins by the amide-directed oxidative cyclisation of enol-Ugi derivatives. Org Biomol Chem 2022; 20:5293-5307. [PMID: 35722807 DOI: 10.1039/d2ob00518b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxidative C(sp3)-H intramolecular imination of hydroxycoumarin enol-Ugi adduct derivatives affords selectively diversely substituted imidazolocoumarins in one pot. The amide group derived from the enol-Ugi isocyanide component directs the functionalisation of the adjacent C(sp3)-H and then is lost as an isocyanate molecule in an unprecedented transformation. This strategy was applied for the synthesis of potential modulators of innate immune system receptor TLR7, which showed high binding affinities in the molecular docking studies.
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Affiliation(s)
- José Luis Ramiro
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.). Departamento de Química Orgánica e Inorgánica. Universidad de Extremadura, 10003 Cáceres, Spain.
| | - Ana G Neo
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.). Departamento de Química Orgánica e Inorgánica. Universidad de Extremadura, 10003 Cáceres, Spain.
| | - Carlos F Marcos
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.). Departamento de Química Orgánica e Inorgánica. Universidad de Extremadura, 10003 Cáceres, Spain.
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Ren S, Wang X, Jin G. Conjugate of ibrutinib with a TLR7 agonist suppresses melanoma progression and enhances antitumor immunity. Int J Biol Sci 2022; 18:166-179. [PMID: 34975325 PMCID: PMC8692160 DOI: 10.7150/ijbs.64094] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 10/21/2021] [Indexed: 12/11/2022] Open
Abstract
The use of large molecules for immunotherapy has led to exciting developments in cancer treatment, such as the development of PD-1/PD-L1 antibodies. However, small molecule targeted therapies still lack effective immune-functional classes. Ideal anticancer drugs should simultaneously generate immune memory when killing cancer cells to prevent tumor relapse and metastasis. To this end, we carried out a rationally designed strategy to develop novel classes of small molecule compounds with bifunctional targeting and immunostimulatory abilities by conjugating targeting compounds with TLR7 agonists, generating immune-targeting conjugates (ImmunTacs). GY161, as a representative ImmunTac, was synthesized via chemical conjugation of ibrutinib with a TLR7 agonist. In vitro, GY161 stimulated the production of cytokines by mouse spleen lymphocytes, promoted the maturation of dendritic cells (DCs), and inhibited the growth and induced the apoptosis of B16 melanoma cells by regulating the c-Met/β-catenin pathway. In vivo, GY161 enhanced the frequency of CD8+ T cells in spleens and tumors, suppressed the growth of B16 melanoma cell-derived tumors and prolonged the survival time of mice. In summary, GY161 could prevent melanoma progression through direct tumor killing and by triggering specific immunity. These results strongly suggest that ImmunTacs are a reliable and promising strategy for developing small molecule immunogenic anticancer drugs.
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Affiliation(s)
- Sumei Ren
- School of Pharmaceutical Sciences, Nation-Regional Engineering Lab for Synthetic Biology of Medicine, International Cancer Center, Shenzhen University Health Science Center, Shenzhen University, Shenzhen 518060, Guangdong, China.,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Xiaodong Wang
- School of Pharmaceutical Sciences, Nation-Regional Engineering Lab for Synthetic Biology of Medicine, International Cancer Center, Shenzhen University Health Science Center, Shenzhen University, Shenzhen 518060, Guangdong, China
| | - Guangyi Jin
- School of Pharmaceutical Sciences, Nation-Regional Engineering Lab for Synthetic Biology of Medicine, International Cancer Center, Shenzhen University Health Science Center, Shenzhen University, Shenzhen 518060, Guangdong, China
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Dolšak A, Šribar D, Scheffler A, Grabowski M, Švajger U, Gobec S, Holze J, Weindl G, Wolber G, Sova M. Further hit optimization of 6-(trifluoromethyl)pyrimidin-2-amine based TLR8 modulators: Synthesis, biological evaluation and structure-activity relationships. Eur J Med Chem 2021; 225:113809. [PMID: 34488023 DOI: 10.1016/j.ejmech.2021.113809] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 08/13/2021] [Accepted: 08/24/2021] [Indexed: 12/26/2022]
Abstract
Toll-like receptor 8 (TLR8) is an endosomal TLR that has an important role in the innate human immune system, which is involved in numerous pathological conditions. Excessive activation of TLR8 can lead to inflammatory and autoimmune diseases, which highlights the need for development of TLR8 modulators. However, only a few small-molecule modulators that selectively target TLR8 have been developed. Here, we report the synthesis and systematic investigation of the structure-activity relationships of a series of novel TLR8 negative modulators based on previously reported 6-(trifluoromethyl)pyrimidin-2-amine derivatives. Four compounds showed low-micromolar concentration-dependent inhibition of TLR8-mediated signaling in HEK293 cells. These data confirm that the 6-trifluoromethyl group and two other substituents on positions 2 and 4 are important structural elements of pyrimidine-based TLR8 modulators. Substitution of the main scaffold at position 2 with a methylsulfonyl group or para hydroxy/hydroxymethyl substituted benzylamine is essential for potent negative modulation of TLR8. Our best-in-class TLR8-selective modulator 53 with IC50 value of 6.2 μM represents a promising small-molecule chemical probe for further optimization to a lead compound with potent immunomodulatory properties.
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Affiliation(s)
- Ana Dolšak
- Chair of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Ljubljana, Aškerčeva c. 7, SI-1000, Ljubljana, Slovenia
| | - Dora Šribar
- Pharmaceutical and Medicinal Chemistry, Institute of Pharmacy, Freie Universität Berlin, Königin-Luise-Str. 2+4, 14195, Berlin, Germany
| | - Alexander Scheffler
- Pharmacology and Toxicology Section, Pharmaceutical Institute, University of Bonn, Gerhard-Domagk-Str. 3, 53121, Bonn, Germany
| | - Maria Grabowski
- Pharmacology and Toxicology, Institute of Pharmacy, Freie Universität Berlin, Königin-Luise-Str. 2+4, 14195, Berlin, Germany
| | - Urban Švajger
- Blood Transfusion Centre of Slovenia, Šlajmerjeva 6, 1000, Ljubljana, Slovenia
| | - Stanislav Gobec
- Chair of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Ljubljana, Aškerčeva c. 7, SI-1000, Ljubljana, Slovenia
| | - Janine Holze
- Pharmacology and Toxicology Section, Pharmaceutical Institute, University of Bonn, Gerhard-Domagk-Str. 3, 53121, Bonn, Germany
| | - Günther Weindl
- Pharmacology and Toxicology Section, Pharmaceutical Institute, University of Bonn, Gerhard-Domagk-Str. 3, 53121, Bonn, Germany.
| | - Gerhard Wolber
- Pharmaceutical and Medicinal Chemistry, Institute of Pharmacy, Freie Universität Berlin, Königin-Luise-Str. 2+4, 14195, Berlin, Germany.
| | - Matej Sova
- Chair of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Ljubljana, Aškerčeva c. 7, SI-1000, Ljubljana, Slovenia.
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Studies towards the Design and Synthesis of Novel 1,5-Diaryl-1 H-imidazole-4-carboxylic Acids and 1,5-Diaryl-1 H-imidazole-4-carbohydrazides as Host LEDGF/p75 and HIV-1 Integrase Interaction Inhibitors. Molecules 2021; 26:molecules26206203. [PMID: 34684786 PMCID: PMC8540437 DOI: 10.3390/molecules26206203] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/07/2021] [Accepted: 10/11/2021] [Indexed: 11/23/2022] Open
Abstract
Two targeted sets of novel 1,5-diaryl-1H-imidazole-4-carboxylic acids 10 and carbohydrazides 11 were designed and synthesized from their corresponding ester intermediates 17, which were prepared via cycloaddition of ethyl isocyanoacetate 16 and diarylimidoyl chlorides 15. Evaluation of these new target scaffolds in the AlphaScreenTM HIV-1 IN-LEDGF/p75 inhibition assay identified seventeen compounds exceeding the pre-defined 50% inhibitory threshold at 100 µM concentration. Further evaluation of these compounds in the HIV-1 IN strand transfer assay at 100 μM showed that none of the compounds (with the exception of 10a, 10l, and 11k, with marginal inhibitory percentages) were actively bound to the active site, indicating that they are selectively binding to the LEDGF/p75-binding pocket. In a cell-based HIV-1 antiviral assay, compounds 11a, 11b, 11g, and 11h exhibited moderate antiviral percentage inhibition of 33–45% with cytotoxicity (CC50) values of >200 µM, 158.4 µM, >200 µM, and 50.4 µM, respectively. The antiviral inhibitory activity displayed by 11h was attributed to its toxicity. Upon further validation of their ability to induce multimerization in a Western blot gel assay, compounds 11a, 11b, and 11h appeared to increase higher-order forms of IN.
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8
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Nallathamby N, Phan CW, Sova M, Saso L, Sabaratnam V. Synthesized 2-Trifluoromethylquinazolines and Quinazolinones Protect BV2 and N2a Cells against LPS- and H 2O 2-induced Cytotoxicity. Med Chem 2021; 17:623-629. [PMID: 31849289 DOI: 10.2174/1573406416666191218095635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 09/09/2019] [Accepted: 10/06/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Microglia are associated with neuroinflammation, which play a key role in the pathogenesis of neurodegenerative diseases. It has been reported that some quinazolines and quinazolinones possess anti-inflammatory properties. However, the pharmacological properties of certain quinazoline derivatives are still unknown. OBJECTIVE The antioxidant, cytotoxic, and protective effects of a series of synthesized 2- trifluoromethylquinazolines (2, 4, and 5) and quinazolinones (6-8) in lipopolysaccharide (LPS)- murine microglia (BV2) and hydrogen peroxide (H2O2)-mouse neuroblastoma-2a (N2a) cells were investigated. METHOD The antioxidant activity of synthesized compounds was evaluated with ABTS and DPPH assays. The cytotoxic activities were determined by MTS assay in BV2 and N2a cells. The production of nitric oxide (NO) in LPS-induced BV2 microglia cells was quantified. RESULTS The highest ABTS and DPPH scavenging activities were observed for compound 8 with 87.7% of ABTS scavenge percentage and 54.2% DPPH inhibition. All compounds were noncytotoxic in BV2 and N2a cells at 5 and 50 μg/mL. The compounds which showed the highest protective effects in LPS-induced BV2 and H2O2-induced N2a cells were 5 and 7. All tested compounds, except 4, also reduced NO production at concentrations of 50 μg/mL. The quinazolinone series 6-8 exhibited the highest percentage of NO reduction, ranging from 38 to 60%. Compounds 5 and 8 possess balanced antioxidant and protective properties against LPS- and H2O2-induced cell death, thus showing great potential to be developed into anti-inflammatory and neuroprotective agents. CONCLUSION Compounds 5 and 7 were able to protect the BV2 and N2a cells against LPS and H2O2 toxicity, respectively, at a low concentration (5 μg/mL). Compounds 6-8 showed potent reduction of NO production in BV2 cells.
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Affiliation(s)
| | - Chia-Wei Phan
- Mushroom Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Matej Sova
- Mushroom Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Luciano Saso
- Mushroom Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Talukdar A, Ganguly D, Roy S, Das N, Sarkar D. Structural Evolution and Translational Potential for Agonists and Antagonists of Endosomal Toll-like Receptors. J Med Chem 2021; 64:8010-8041. [PMID: 34107682 DOI: 10.1021/acs.jmedchem.1c00300] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Toll-like receptors (TLRs) are members of a large family of evolutionarily conserved pattern recognition receptors (PRRs), which serve as key components of the innate immune system by playing a pivotal role in sensing "nonself" ligands. Endosomal TLRs (TLR3, TLR7, TLR8, and TLR9) can recognize pathogen-derived nucleic acid and initiate an innate immune response because they react against both self- and non-self-origin nucleic acid molecules. Accordingly, both receptor agonists and antagonists are potentially useful in disparate clinical contexts and thus are globally sought after. Recent research has revealed that agonists and antagonists share an overlapping binding region. This Perspective highlights rational medicinal chemistry approaches to elucidate the structural attributes of small molecules capable of agonism or antagonism or of elegantly switching between the two. The structural evolution of different chemotypes can provide the framework for the future development of endosomal TLR agonists and antagonists.
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Affiliation(s)
- Arindam Talukdar
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, West Bengal, India.,Academy of Scientific and Innovative Research, Ghaziabad 201002, Uttar Pradesh, India
| | - Dipyaman Ganguly
- IICB-Translational Research Unit of Excellence, Department of Cancer Biology and Inflammatory Disorders, CSIR-Indian Institute of Chemical Biology, CN6, Sector V, Salt Lake, Kolkata 700091, West Bengal, India.,Academy of Scientific and Innovative Research, Ghaziabad 201002, Uttar Pradesh, India
| | - Swarnali Roy
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, West Bengal, India
| | - Nirmal Das
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, West Bengal, India.,Academy of Scientific and Innovative Research, Ghaziabad 201002, Uttar Pradesh, India
| | - Dipika Sarkar
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, West Bengal, India
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Sangeetha M, Manoj M. Efficient Synthetic Route to Access Linear and Angular Dibenzonaphthyridines. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2019. [DOI: 10.1134/s1070428019100221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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