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Pipaliya BV, Seth K, Chakraborti AK. Ruthenium (II) Catalyzed C(sp 2 )-H Bond Alkenylation of 2-Arylbenzo[d]oxazole and 2-Arylbenzo[d]thiazole with Unactivated Olefins. Chem Asian J 2021; 16:87-96. [PMID: 33230945 DOI: 10.1002/asia.202001304] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Indexed: 01/10/2023]
Abstract
Functionalization of the bio-relevant heterocycles 2-arylbenzo[d]oxazole and 2-arylbenzo[d]thiazole has been achieved through Ru(II)-catalyzed alkenylation with unactivated olefins leading to selective formation of the mono-alkenylated products. This approach has a broad substrate scope with respect to the coupling partners, affords high yields, and works for gram scale synthesis using a readily available Ru-based catalyst. Mechanistic studies reveal a C-H activation pathway for the dehydrogenative coupling leading to the alkenylation. However, the results of the ESI-MS-guided deuterium kinetic isotope effect studies indicate that the C-H activation stage may not be the rate-determining step of the reaction. The use of a radical scavenging agent such as TEMPO did not show any detrimental effect on the reaction outcome, eliminating the possibility of the involvement of a free-radical pathway.
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Affiliation(s)
- Bhavin V Pipaliya
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S., Nagar, Punjab, 160062, India
| | - Kapileswar Seth
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S., Nagar, Punjab, 160062, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S., Nagar, Punjab, 160062, India.,Department of Chemistry, S. S. Bhatnagar Building, Main Campus, Indian Institute of Technology (IIT), Ropar, Rupnagar, Punjab, 140001, India
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2
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Sofi FA, Sharma R, Rawat R, Chakraborti AK, Bharatam PV. Visible light promoted tandem dehydrogenation-deaminative cyclocondensation under aerobic conditions for the synthesis of 2-aryl benzimidazoles/quinoxalines from ortho-phenylenediamines and arylmethyl/ethyl amines. NEW J CHEM 2021. [DOI: 10.1039/d0nj03002c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Visible light promoted tandem dehydrogenation-deaminative cyclocondensation of arylmethyl/ethyl amines with ortho-phenylenediamines under aerobic conditions is reported for the synthesis of 2-aryl benzimidazoles/quinoxalines.
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Affiliation(s)
- Firdoos Ahmad Sofi
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar
- India
| | - Rohit Sharma
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar
- India
| | - Ravi Rawat
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar
- India
| | - Prasad V. Bharatam
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar
- India
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3
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Dhameliya TM, Patel KI, Tiwari R, Vagolu SK, Panda D, Sriram D, Chakraborti AK. Design, synthesis, and biological evaluation of benzo[d]imidazole-2-carboxamides as new anti-TB agents. Bioorg Chem 2020; 107:104538. [PMID: 33349456 DOI: 10.1016/j.bioorg.2020.104538] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 10/17/2020] [Accepted: 12/04/2020] [Indexed: 01/25/2023]
Abstract
Tuberculosis is the leading cause of death globally among infectious diseases. Due to the development of resistance of Mycobacterium tuberculosis to currently used anti-TB medicines and the TB-HIV synergism the urgent need to develop novel anti-mycobacterial agents has been realized. The drug-to-target path has been the successful strategy for new anti-TB drug development. All the six drug candidates that have shown promise during the clinical trials and some of these being approved for treatment against MDR TB are the results of phenotype screening of small molecule compound libraries. In search of compounds belonging to novel pharmacophoric class that could be subjected to whole cell assay to generate new anti-TB leads the benzo[d]imidazole-2-carboxamide moiety has been designed as a novel anti-TB scaffold. The design was based on the identification of the benzimidazole ring as a prominent substructure of the FDA approved drugs, the structural analysis of reported anti-TB benzimidazoles, and the presence of the C-2 carboxamido functionality in novel bioisoteric anti-TB benzothiazoles. Twenty seven final compounds have been prepared via NH4Cl-catalyzed amidation of ethyl benzo[d]imidazole-2-carboxylates, as the required intermediates, obtained through a green "all water" one-pot synthetic route following a tandem N-arylation-reduction-cyclocondensation procedure. All of the synthesised target compounds were assessed for anti-TB potential using H37Rv ATCC27294 strain. Thirteen compounds were found with better MIC (0.78-6.25 µg/mL) than the standard drugs and being non-cytotoxic nature (<50% inhibition against RAW 264.7 cell lines at 50 µg/mL). The compound 8e exhibited best anti-TB activity (MIC: 2.15 µM and selectivity index: > 60) and a few others e.g., 8a, 8f, 8k and 8o are the next best anti-TB hits (MIC: 1.56 µg/mL). The determination and analysis of various physiochemical parameters revealed favorable druglike properties of the active compounds. The compounds 8a-l and 8o, with MIC values of ≤ 6.25 μg/mL, have high LipE values (10.66-11.77) that are higher than that of the suggested value of > 6 derived from empirical evidence for quality drug candidates and highlight their therapeutic potential. The highest LipE value of 11.77 of the best active compound 8e with the MIC of 0.78 μg/mL indicates its better absorption and clearance as a probable clinical candidate for anti-TB drug discovery. These findings highlight the discovery of benzimidazole-2-carboxamides for further development as new anti-TB agents.
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Affiliation(s)
- Tejas M Dhameliya
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062 Punjab, India
| | - Kshitij I Patel
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062 Punjab, India
| | - Rishu Tiwari
- Department of Biosciences & Bioengineering, Indian Institute of Technology Bombay, Mumbai 400 076, India
| | - Siva Krishna Vagolu
- Department of Pharmacy, Birla Institute of Technology & Science - Pilani, Hyderabad Campus, Jawahar Nagar, Hyderabad 500 078, India
| | - Dulal Panda
- Department of Biosciences & Bioengineering, Indian Institute of Technology Bombay, Mumbai 400 076, India
| | - Dharmarajan Sriram
- Department of Pharmacy, Birla Institute of Technology & Science - Pilani, Hyderabad Campus, Jawahar Nagar, Hyderabad 500 078, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062 Punjab, India; Department of Chemistry, Indian Institute of Technology - Ropar, Rupnagar, Punjab 140 001, India.
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4
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Singh DK, Sahu A, Wani AA, Bharatam PV, Chakraborti AK, Giri S, Singh S. Characterization of Photodegradation Products of Bepotastine Besilate and In Silico Evaluation of Their Physicochemical, Absorption, Distribution, Metabolism, Excretion and Toxicity Properties. J Pharm Sci 2020; 109:1883-1895. [PMID: 32173321 DOI: 10.1016/j.xphs.2020.03.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 02/13/2020] [Accepted: 03/06/2020] [Indexed: 12/21/2022]
Abstract
Bepotastine (BPT) is a H1-receptor antagonist. It is used as a besilate salt in ophthalmic solution for allergic conjunctivitis and orally for the treatment of allergic rhinitis and urticaria/pruritus. Its systematic forced degradation study is unreported. The same was carried out in different conditions prescribed by International Conference on Harmonisation. The stressed solutions were subjected to reversed phase liquid chromatographic analysis, and BPT was observed to be labile under photobasic condition only, yielding 5 photodegradation products. The structures of the latter were elucidated from data generated by liquid chromatography-high-resolution mass spectrometry and multistage mass spectrometry. Of the 5, 4 products were further isolated and subjected to nuclear magnetic resonance spectroscopy to justify the proposed structures. Two of them, with similar accurate mass, were additionally and unambiguously characterized from their heteronuclear multiple bond correlation data, hydrogen deuterium exchange mass data, and quantum chemical analysis using density functional theory calculations. One degradation product had a structure that could only be explained by unusual rearrangement involving conversions of N-oxide into hydroxylamine, similar to Meisenheimer rearrangement. The physicochemical, as well as absorption, distribution, metabolism, excretion, and toxicity properties of BPT and its characterized photodegradation products were evaluated in silico by ADMET Predictor™ software.
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Affiliation(s)
- Dilip Kumar Singh
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Archana Sahu
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Aabid Abdullah Wani
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Sanjeev Giri
- DMPK and Pharmaceutical Development, Aurigene Discovery Technologies Limited, Hyderabad 500 049, Telangana, India
| | - Saranjit Singh
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India.
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5
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Kumar R, Saha N, Purohit P, Garg SK, Seth K, Meena VS, Dubey S, Dave K, Goyal R, Sharma SS, Banerjee UC, Chakraborti AK. Cyclic enaminone as new chemotype for selective cyclooxygenase-2 inhibitory, anti-inflammatory, and analgesic activities. Eur J Med Chem 2019; 182:111601. [PMID: 31445233 DOI: 10.1016/j.ejmech.2019.111601] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/05/2019] [Accepted: 08/06/2019] [Indexed: 01/30/2023]
Abstract
The cyclic enaminone moiety has been identified as a new scaffold for selective inhibition of cyclooxygenase-2 with anti-inflammatory and analgesic activities. The designed cyclic enaminones have been synthesized conveniently through the development of a new catalyst-free methodology and evaluated for cyclooxygenase (COX-1 and COX-2) inhibitory activities. Three compounds 7d, 8, and 9 predominantly inhibited COX-2 with selectivity index of 74.09, 19.45 and 108.68, respectively, and were assessed for in vivo anti-inflammatory activity in carrageenan induced rat paw edema assay. The anti-inflammatory activity of 7d was comparable to that of celecoxib at a dose of 12.5 mg/kg. However, the compounds 8 and 9 were more/equally effective as anti-inflammatory agent compared to celecoxib at the doses of 12.5 mg/kg and 25 mg/kg and also exhibited anti-inflammatory activity comparable to that of diclofenac. The therapeutic potential of the most active compound 9 was further assessed by performing in vivo thermal and mechanical hyperalgesia tests using various models that revealed its analgesic activity. The in vivo non-ulcerogenicity of 9 revealed the gastrointestinal safety as compared to the non-selective COX inhibitor indomethacin. The in vitro antioxidant activity and in vivo experiments on heart rate and blood pressure provided the cardiovascular safety profile of 9. The molecular docking studies rationalize the COX-2 selectivity of the newly found anti-inflammatory compounds 7d, 8, and 9.
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Affiliation(s)
- Raj Kumar
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Nirjhar Saha
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Priyank Purohit
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Sanjeev K Garg
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Kapileswar Seth
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Vachan S Meena
- Department of Pharmaceutical Technology (Biotechnology), National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, 160 062, Punjab, India
| | - Sachin Dubey
- Department of Pharmaceutical Technology (Biotechnology), National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, 160 062, Punjab, India
| | - Khyati Dave
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, 160 062, Punjab, India
| | - Rohit Goyal
- Indo-Soviet Friendship (ISF) College of Pharmacy, Moga, 142 001, Punjab, India
| | - Shyam S Sharma
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, 160 062, Punjab, India
| | - Uttam C Banerjee
- Department of Pharmaceutical Technology (Biotechnology), National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, 160 062, Punjab, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India.
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6
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Sofi FA, Sharma R, Chakraborti AK, Bharatam PV. Tandem Oxidative Cyclocondensation towards 2,3-Disubstituted Quinazolinones in the Presence of [Bmim][BF4
] and Iodine. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900969] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Firdoos Ahmad Sofi
- Department of Medicinal Chemistry; National Institute of Pharmaceutical Education and Research (NIPER); Sector 67 160062 S. A. S. Nagar Punjab India
| | - Rohit Sharma
- Department of Medicinal Chemistry; National Institute of Pharmaceutical Education and Research (NIPER); Sector 67 160062 S. A. S. Nagar Punjab India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry; National Institute of Pharmaceutical Education and Research (NIPER); Sector 67 160062 S. A. S. Nagar Punjab India
| | - Prasad V. Bharatam
- Department of Medicinal Chemistry; National Institute of Pharmaceutical Education and Research (NIPER); Sector 67 160062 S. A. S. Nagar Punjab India
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7
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Bhagat S, Supriya M, Pathak S, Sriram D, Chakraborti AK. α-Sulfonamidophosphonates as new anti-mycobacterial chemotypes: Design, development of synthetic methodology, and biological evaluation. Bioorg Chem 2019; 82:246-252. [DOI: 10.1016/j.bioorg.2018.09.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Revised: 08/12/2018] [Accepted: 09/13/2018] [Indexed: 12/15/2022]
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8
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Kathuria D, Gupta P, Chourasiya SS, Sahoo SC, Beifuss U, Chakraborti AK, Bharatam PV. An unprecedented intramolecular to intermolecular mechanistic switch in 1,1-diaminoazines leading to differential product formation during the I2-induced tandem oxidative transformation. Org Biomol Chem 2019; 17:4129-4138. [DOI: 10.1039/c9ob00610a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Intermolecular cyclization of 1,1-diaminoazine.
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Affiliation(s)
- Deepika Kathuria
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S.A.S. Nagar – 160 062
- India
| | - Pankaj Gupta
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S.A.S. Nagar – 160 062
- India
| | - Sumit S. Chourasiya
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S.A.S. Nagar – 160 062
- India
| | - Subash C. Sahoo
- Department of Chemistry
- Panjab University
- Chandigarh – 160014
- India
| | - Uwe Beifuss
- Bioorganische Chemie
- Institut für Chemie
- Universität
- D-70599 Stuttgart
- Germany
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S.A.S. Nagar – 160 062
- India
| | - Prasad V. Bharatam
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S.A.S. Nagar – 160 062
- India
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9
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Tiwari SK, Singh DK, Ladumor MK, Chakraborti AK, Singh S. Study of degradation behaviour of montelukast sodium and its marketed formulation in oxidative and accelerated test conditions and prediction of physicochemical and ADMET properties of its degradation products using ADMET Predictor™. J Pharm Biomed Anal 2018; 158:106-118. [DOI: 10.1016/j.jpba.2018.05.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 05/22/2018] [Indexed: 02/07/2023]
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10
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Dhameliya TM, Tiwari R, Banerjee A, Pancholia S, Sriram D, Panda D, Chakraborti AK. Benzo[d]thiazole-2-carbanilides as new anti-TB chemotypes: Design, synthesis, biological evaluation, and structure-activity relationship. Eur J Med Chem 2018; 155:364-380. [PMID: 29902722 DOI: 10.1016/j.ejmech.2018.05.049] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 11/26/2022]
Abstract
Tuberculosis is the second leading cause of deaths worldwide. The inadequacy of existing drugs to treat TB due to developed resistance and TB-HIV synergism urges for new anti-TB drugs. Seventy-two benzo[d]thiazole-2-carbanilides have been synthesized through CDI-mediated direct coupling of benzo[d]thiazole-2-carboxylic acids with aromatic amines using a three step methodology which includes a green protocol for synthesis of ethyl benzo[d]thiazole-2-carboxylates, precursor of the desired carboxylic acids. The compounds were evaluated in vitro for anti-tubercular activity against M. tuberculosis H37Rv (ATCC27294 strain). Thirty-two compounds exhibiting MIC values in the range of 0.78-6.25 μg/mL (1.9-23 μM) were subjected to cell viability test against RAW 264.7 cell lines and thirty compounds were found to be non-toxic (<50% inhibition). The most active compounds with MIC of 0.78 μg/mL (e.g., 4i, 4n, 4s, 4w, 6f, 6h, 6u, 7e, 7h, 7p, 7r and 7w) exhibit therapeutic index of 64. The structure activity relationship of the N-arylbenzo[d]thiazole-2-carboxamides has been established for anti-mycobacterial activity. Molecular docking suggests that the compounds 7w, 4i and 4n bind to the catalytic site of the enzyme ATP Phosphoribosyltransferase (HisG) and might be attributed to their anti-TB potential. These can serve as a new starting point for the development of anti-TB agents with therapeutic potential.
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Affiliation(s)
- Tejas M Dhameliya
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Rishu Tiwari
- Department of Biosciences & Bioengineering, Indian Institute of Technology Bombay, Mumbai, 400 076, India
| | - Arkaprabha Banerjee
- Department of Biosciences & Bioengineering, Indian Institute of Technology Bombay, Mumbai, 400 076, India
| | - Sahaj Pancholia
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India
| | - Dharmarajan Sriram
- Department of Pharmacy, Birla Institute of Technology & Science - Pilani, Hyderabad Campus, Jawahar Nagar, Hyderabad, 500 078, India
| | - Dulal Panda
- Department of Biosciences & Bioengineering, Indian Institute of Technology Bombay, Mumbai, 400 076, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, 160 062, Punjab, India.
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Patel N, Arfeen M, Sood R, Khullar S, Chakraborti AK, Mandal SK, Bharatam PV. Can Remote N-Heterocyclic Carbenes Coordinate with Main Group Elements? Synthesis, Structure, and Quantum Chemical Analysis of N + -Centered Complexes. Chemistry 2018; 24:6418-6425. [PMID: 29504658 DOI: 10.1002/chem.201705999] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Indexed: 11/11/2022]
Abstract
Remote N-heterocyclic carbenes (rNHCs), such as N-methyl-4-pyridylidene, are known to form coordination complexes with TMs. Herein, it is established that rNHCs can also coordinate to the N+ centre. Synthesis of some novel divalent NI complexes with the general formula (rNHC)→N+ ←(NHC) and (rNHC)→N+ ←(rNHC) was achieved, and X-ray diffraction studies supported the coordination bond character between the rNHCs and the N+ centre. Quantum chemical analysis established the presence of divalent NI character at the central nitrogen in these systems.
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Affiliation(s)
- Neha Patel
- National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S., Nagar, 160 062, Punjab, India
| | - Minhajul Arfeen
- National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S., Nagar, 160 062, Punjab, India
| | - Radhika Sood
- National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S., Nagar, 160 062, Punjab, India
| | - Sadhika Khullar
- Department of Chemistry, D.A.V. University, Jalandhar-Pathankot National Highway, Jalandhar, 144012, Punjab, India
| | - Asit K Chakraborti
- National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S., Nagar, 160 062, Punjab, India
| | - Sanjay K Mandal
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Sector 81, S.A.S., Nagar, 140 308, Punjab, India
| | - Prasad V Bharatam
- National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S., Nagar, 160 062, Punjab, India
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12
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Pipaliya BV, Chakraborti AK. Ligand-Assisted Heteroaryl C(sp2
)−H Bond Activation by a Cationic Ruthenium(II) Complex for Alkenylation of Heteroarenes with Alkynes Directed by Biorelevant Heterocycles. ChemCatChem 2017. [DOI: 10.1002/cctc.201701016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Bhavin V. Pipaliya
- Department of Medicinal Chemistry; National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S.; Nagar 160 062 India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry; National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S.; Nagar 160 062 India
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13
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Dhameliya TM, Chourasiya SS, Mishra E, Jadhavar PS, Bharatam PV, Chakraborti AK. Rationalization of Benzazole-2-carboxylate versus Benzazine-3-one/Benzazine-2,3-dione Selectivity Switch during Cyclocondensation of 2-Aminothiophenols/Phenols/Anilines with 1,2-Biselectrophiles in Aqueous Medium. J Org Chem 2017; 82:10077-10091. [DOI: 10.1021/acs.joc.7b01548] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tejas M. Dhameliya
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160 062, India
| | - Sumit S. Chourasiya
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160 062, India
| | - Eshan Mishra
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160 062, India
| | - Pradeep S. Jadhavar
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160 062, India
| | - Prasad V. Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160 062, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab 160 062, India
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14
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Pipaliya BV, Chakraborti AK. Cross-Dehydrogenative Coupling of Heterocyclic Scaffolds with Unfunctionalized Aroyl Surrogates by Palladium(II) Catalyzed C(sp2)-H Aroylation through Organocatalytic Dioxygen Activation. J Org Chem 2017; 82:3767-3780. [DOI: 10.1021/acs.joc.7b00226] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Bhavin V. Pipaliya
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector
67, S. A. S. Nagar, Punjab 160 062, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector
67, S. A. S. Nagar, Punjab 160 062, India
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15
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Purohit P, Seth K, Kumar A, Chakraborti AK. C–O Bond Activation by Nickel–Palladium Hetero-Bimetallic Nanoparticles for Suzuki–Miyaura Reaction of Bioactive Heterocycle-Tethered Sterically Hindered Aryl Carbonates. ACS Catal 2017. [DOI: 10.1021/acscatal.6b02912] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Priyank Purohit
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Kapileswar Seth
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Asim Kumar
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
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16
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Handa T, Jhajra S, Bhagat S, Bharatam P, Chakraborti AK, Singh S. Molecular insight into atypical instability behavior of fixed-dose combination containing amlodipine besylate and losartan potassium. J Pharm Biomed Anal 2017; 136:66-80. [DOI: 10.1016/j.jpba.2016.12.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 12/20/2016] [Accepted: 12/24/2016] [Indexed: 10/20/2022]
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17
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Chourasiya SS, Patel DR, Nagaraja CM, Chakraborti AK, Bharatam PV. Sulfonamide vs. sulfonimide: tautomerism and electronic structure analysis of N-heterocyclic arenesulfonamides. NEW J CHEM 2017. [DOI: 10.1039/c7nj01353a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experimental and computational studies suggest a preference toward the sulfonimide tautomer in N-heterocyclic arenesulfonamide.
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Affiliation(s)
- Sumit S. Chourasiya
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- Punjab – 160 062
- India
| | - Dhara R. Patel
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- Punjab – 160 062
- India
| | - C. M. Nagaraja
- Department of Chemistry
- Indian Institute of Technology (IIT) Ropar
- Roopnagar – 140 001
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- Punjab – 160 062
- India
| | - Prasad V. Bharatam
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- Punjab – 160 062
- India
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18
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Tanwar B, Kumar A, Yogeeswari P, Sriram D, Chakraborti AK. Design, development of new synthetic methodology, and biological evaluation of substituted quinolines as new anti-tubercular leads. Bioorg Med Chem Lett 2016; 26:5960-5966. [DOI: 10.1016/j.bmcl.2016.10.082] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 10/25/2016] [Accepted: 10/27/2016] [Indexed: 10/20/2022]
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19
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Seth K, Purohit P, Chakraborti AK. Microwave Assisted Synthesis of Biorelevant Benzazoles. Curr Med Chem 2016; 24:4638-4676. [PMID: 27781941 DOI: 10.2174/0929867323666161025142005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 09/05/2016] [Accepted: 09/05/2016] [Indexed: 11/22/2022]
Abstract
The benzazole scaffolds are present in various therapeutic agents and have been recognized as the essential pharmacophore for diverse biological activities. These have generated interest and necessity to develop efficient synthetic methods of these privileged classes of compounds to generate new therapeutic leads for various diseases. The biological activities of the benzazoles and efforts towards their synthesis have been summarized in a few review articles. In view of these, the aim of this review is to provide an account of the developments that have taken place in the synthesis of biorelevant benzazoles under microwave irradiation as the application of microwave heating has long been recognized as a green chemistry tool for speedy generation of synthetic targets. Attention has been focused to those literature reports wherein the use of microwave irradiation is the key step in the formation of the heterocyclic ring system or in functionalization of the benzazole ring system to generate the essential pharmacophoric feature. The convenient and economic way to synthesize these privileged class of heterocycles through the use of microwave irradiation that would be beneficial for the drug discovery scientist to synthesize biologically active benzazoles and provide access to wide range of reactions for the synthesis of benzazoles constitute the theme of this review. Examples have been drawn wherein the use of microwave heating offers distinct advantage in terms of improved product yields and reduction of reaction time as compared to those observed for the synthesis under conventional heating.
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Affiliation(s)
- Kapileswar Seth
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Priyank Purohit
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
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20
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Parikh N, Chakraborti AK. Phosphodiesterase 4 (PDE4) Inhibitors in the Treatment of COPD: Promising Drug Candidates and Future Directions. Curr Med Chem 2016; 23:129-41. [PMID: 26572614 DOI: 10.2174/0929867323666151117121334] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 09/15/2015] [Accepted: 11/16/2015] [Indexed: 11/22/2022]
Abstract
The PDE4 enzyme has been proven to be a versatile drug target for therapeutics to treat diverse disease conditions such as asthma, COPD, diabetes, Huntington's disease, and various other inflammatory disorders. The treatment of COPD is the most studied utility for PDE4 inhibitors due to their ability to inhibit inflammatory cell responses. Roflumilast is the only approved drug belonging to this class to treat COPD and has shown significant results in the treatment of asthmatic patients. This perspective highlights the pharmacological details of roflumilast and cilomilast. Moreover, efforts have been made to justify the superiority of roflumilast over cilomilast by detailed comparison of their pharmacological, pharmacokinetic, pharmacodynamic properties and structural features. Several other molecules, with promising PDE4 inhibitory activity have also been highlighted. Commonly associated side effects with this class of compounds, their management, and future direction towards the development of PDE4 inhibitors with improved therapeutic index are the focus of this perspective. More emphasis has been given towards the future development strategies to limit the side effects such as emesis and to achieve better benefit to risk ratio.
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Affiliation(s)
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, Punjab 160 062, India.
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21
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Chourasiya SS, Kathuria D, Nikam SS, Ramakrishnan A, Khullar S, Mandal SK, Chakraborti AK, Bharatam PV. Azine-Hydrazone Tautomerism of Guanylhydrazones: Evidence for the Preference Toward the Azine Tautomer. J Org Chem 2016; 81:7574-7583. [PMID: 27494613 DOI: 10.1021/acs.joc.6b01258] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Guanylhydrazones have been known for a long time and have wide applications in organic synthesis, medicinal chemistry, and material science; however, little attention has been paid toward their electronic and structural properties. Quantum chemical analysis on several therapeutically important guanylhydrazones indicated that all of them prefer the azine tautomeric state (by about 3-12 kcal/mol). A set of simple and conjugated azines were designed using quantum chemical methods, whose tautomeric preference toward the azine tautomer is in the range of 3-8 kcal/mol. Twenty new azines were synthesized and isolated in their neutral state. Variable temperature NMR study suggests existence of the azine tautomer even at higher temperatures with no traces of the hydrazone tautomer. The crystal structures of two representative compounds confirmed that the title compounds prefer to exist in their azine tautomeric form.
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Affiliation(s)
- Sumit S Chourasiya
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Deepika Kathuria
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Sampada S Nikam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Ashok Ramakrishnan
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Sadhika Khullar
- Department of Chemical Sciences, Indian Institute of Science Education and Research , Mohali Sector 81, S.A.S. Nagar 140 306, Punjab, India
| | - Sanjay K Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research , Mohali Sector 81, S.A.S. Nagar 140 306, Punjab, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, S.A.S. Nagar 160 062, Punjab, India
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22
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Arfeen M, Bhagat S, Patel R, Prasad S, Roy I, Chakraborti AK, Bharatam PV. Design, synthesis and biological evaluation of 5-benzylidene-2-iminothiazolidin-4-ones as selective GSK-3β inhibitors. Eur J Med Chem 2016; 121:727-736. [PMID: 27423119 DOI: 10.1016/j.ejmech.2016.04.075] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/26/2016] [Accepted: 04/28/2016] [Indexed: 01/16/2023]
Abstract
In this work, iminothiazolidin-4-one derivatives were explored as selective GSK-3β inhibitors. Molecular docking analysis was carried to design a series of compounds, which were synthesized using substituted thiourea, 2-bromoacetophenones and benzaldehydes. Out of the twenty five compounds synthesized during this work, the in vitro evaluation against GSK-3 led to the identification of nine compounds with activity in lower nano-molar range (2-85 nM). Further, in vitro evaluation against CDK-2 showed five compounds to be selective towards GSK-3.
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Affiliation(s)
- Minhajul Arfeen
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, 160062, Punjab, India
| | - Shweta Bhagat
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, 160062, Punjab, India
| | - Rahul Patel
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, 160062, Punjab, India
| | - Shivcharan Prasad
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, 160062, Punjab, India
| | - Ipsita Roy
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, 160062, Punjab, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, 160062, Punjab, India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, 160062, Punjab, India.
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23
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Seth K, Raha Roy S, Chakraborti AK. Synchronous double C–N bond formation via C–H activation for a novel synthetic route to phenazine. Chem Commun (Camb) 2016; 52:922-5. [DOI: 10.1039/c5cc08640j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Pd–Ag binary nanocluster-catalysed synchronous double C–N bond formationviaC–H activation during self-coupling of anilines to form phenazines.
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Affiliation(s)
- Kapileswar Seth
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Sector 67
- Punjab
- India
| | - Sudipta Raha Roy
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Sector 67
- Punjab
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Sector 67
- Punjab
- India
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24
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Seth K, Roy SR, Kumar A, Chakraborti AK. The palladium and copper contrast: a twist to products of different chemotypes and altered mechanistic pathways. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00415f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unprecedented Pd–Ag/Cu–Ag nanocluster-catalyst switch leads to a phenazine/azoarene twist for non-radical mode C–H activation vs. radical mode N–N self-coupling of anilines.
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Affiliation(s)
- Kapileswar Seth
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Sudipta Raha Roy
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Asim Kumar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
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25
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Dixit VA, Rathi PC, Bhagat S, Gohlke H, Petersen RK, Kristiansen K, Chakraborti AK, Bharatam PV. Design and synthesis of novel Y-shaped barbituric acid derivatives as PPARγ activators. Eur J Med Chem 2016; 108:423-435. [DOI: 10.1016/j.ejmech.2015.11.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 11/18/2015] [Accepted: 11/19/2015] [Indexed: 10/22/2022]
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26
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Bharatam PV, Arfeen M, Patel N, Jain P, Bhatia S, Chakraborti AK, Khullar S, Gupta V, Mandal SK. Design, Synthesis, and Structural Analysis of Divalent N(I) Compounds and Identification of a New Electron-Donating Ligand. Chemistry 2015; 22:1088-96. [PMID: 26615987 DOI: 10.1002/chem.201503618] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Indexed: 11/09/2022]
Abstract
The dative-bond representation (L→E) in compounds with main group elements (E) has triggered extensive debate in the recent past. The scope and limits of this nonclassical coordination bond warrant comprehensive exploration. Particularly compounds with (L→N←L')(+) arrangement are of special interest because of their therapeutic importance. This work reports the design and synthesis of novel chemical species with the general structural formula (L→N←L')(+) carrying the unusual ligand cyclohexa-2,5-diene-4-(diaminomethynyl)-1-ylidene. Four species belonging to the (L→N←L')(+) class carrying this unconventional ligand were synthesized. Quantum chemical and X-ray diffraction analyses showed that the electronic and geometric parameters are consistent with those of already reported divalent N(I) compounds. The molecular orbital analysis, geometric parameters, and spectral data clearly support the L→N and N←L' interactions in these species. The newly identified ligand has the properties of a reactive carbene and high nucleophilicity.
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Affiliation(s)
- Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar -, 160 062, Punjab, India.
| | - Minhajul Arfeen
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar -, 160 062, Punjab, India
| | - Neha Patel
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar -, 160 062, Punjab, India
| | - Priyanka Jain
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar -, 160 062, Punjab, India
| | - Sonam Bhatia
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar -, 160 062, Punjab, India
| | - Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar -, 160 062, Punjab, India.
| | - Sadhika Khullar
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Sector 81, S.A.S. Nagar -, 140 308, Punjab, India
| | - Vijay Gupta
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Sector 81, S.A.S. Nagar -, 140 308, Punjab, India
| | - Sanjay K Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Sector 81, S.A.S. Nagar -, 140 308, Punjab, India.
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27
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Tanwar B, Kumar D, Kumar A, Ansari MI, Qadri MM, Vaja MD, Singh M, Chakraborti AK. Friedländer annulation: scope and limitations of metal salt Lewis acid catalysts in selectivity control for the synthesis of functionalised quinolines. NEW J CHEM 2015. [DOI: 10.1039/c5nj02010g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In(OTf)3 is the most effective catalyst among metal halides, tetrafluoroborates, perchlorates, and triflates for Friedländer quinoline synthesis in 75–92% yields.
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Affiliation(s)
- Babita Tanwar
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Dinesh Kumar
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Asim Kumar
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Md. Imam Ansari
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Mohammad Mohsin Qadri
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Maulikkumar D. Vaja
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Madhulika Singh
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER)
- India
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28
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Kumar D, Jadhavar PS, Nautiyal M, Sharma H, Meena PK, Adane L, Pancholia S, Chakraborti AK. Convenient synthesis of 2,3-disubstituted quinazolin-4(3H)-ones and 2-styryl-3-substituted quinazolin-4(3H)-ones: applications towards the synthesis of drugs. RSC Adv 2015. [DOI: 10.1039/c5ra03888j] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Simple, convenient, and green synthetic protocols have been developed for the one pot synthesis of 2,3-disubstituted quinazolin-4(3H)-ones and 2-styryl-3-substituted quinazolin-4(3H)-ones under catalyst and solvent free conditions.
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Affiliation(s)
- Dinesh Kumar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Pradeep S. Jadhavar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Manesh Nautiyal
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Himanshu Sharma
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Prahlad K. Meena
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Legesse Adane
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Sahaj Pancholia
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
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29
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Chourasiya SS, Kathuria D, Singh S, Sonawane VC, Chakraborti AK, Bharatam PV. Design, synthesis and biological evaluation of novel unsymmetrical azines as quorum sensing inhibitors. RSC Adv 2015. [DOI: 10.1039/c5ra12925g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this report, novel unsymmetrical azines have been designed and synthesised by using one pot approach. Further, they were evaluated as quorum sensing inhibitors.
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Affiliation(s)
- Sumit S. Chourasiya
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Deepika Kathuria
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Shaminder Singh
- Bio-Chemical Engineering Research and Process Development Centre (BERPDC)
- Institute of Microbial Technology (IMTECH)
- India
| | - Vijay C. Sonawane
- Bio-Chemical Engineering Research and Process Development Centre (BERPDC)
- Institute of Microbial Technology (IMTECH)
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Prasad V. Bharatam
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
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30
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Tanwar B, Purohit P, Raju BN, Kumar D, Kommi DN, Chakraborti AK. An “all-water” strategy for regiocontrolled synthesis of 2-aryl quinoxalines. RSC Adv 2015. [DOI: 10.1039/c4ra16568c] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
CascadeN-aroylmethylation–reduction–condensation process as novel strategy of “all water chemistry” for first generalized regioselective synthesis of 2-aryl quinoxalines.
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Affiliation(s)
- Babita Tanwar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Priyank Purohit
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Banothu Naga Raju
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Dinesh Kumar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Damodara N. Kommi
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
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31
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Kumar D, Kumar A, Qadri MM, Ansari MI, Gautam A, Chakraborti AK. In(OTf)3-catalyzed synthesis of 2-styryl quinolines: scope and limitations of metal Lewis acids for tandem Friedländer annulation–Knoevenagel condensation. RSC Adv 2015. [DOI: 10.1039/c4ra10613j] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Investigation of metal Lewis acids for one-pot tandem Friedländer annulation–Knoevenagel condensation and exploration of In(OTf)3for synthesis of 2-styryl quinolines.
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Affiliation(s)
- Dinesh Kumar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Asim Kumar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Mohammad Mohsin Qadri
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Md. Imam Ansari
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Abhishek Gautam
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Punjab
- India
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32
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Seth K, Nautiyal M, Purohit P, Parikh N, Chakraborti AK. Palladium catalyzed Csp2–H activation for direct aryl hydroxylation: the unprecedented role of 1,4-dioxane as a source of hydroxyl radicals. Chem Commun (Camb) 2015; 51:191-4. [DOI: 10.1039/c4cc06864e] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Direct aryl hydroxylation has been achieved via palladium-catalysed Csp2–H activation using versatile directing groups through unprecedented hydroxyl transfer from 1,4-dioxane.
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Affiliation(s)
- Kapileswar Seth
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Manesh Nautiyal
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Priyank Purohit
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Naisargee Parikh
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- India
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33
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Banoth L, Pujala B, Chakraborti AK, Banerjee UC. Development and validation of HPLC method for the resolution of derivatives of 1-bromo-3-chloro-2-propanol: a novel chiral building block for the synthesis of pharmaceutically important compounds. J Anal Chem 2014. [DOI: 10.1134/s1061934815010098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Singh S, Wanjari PJ, Bhatia S, Sonwane VC, Chakraborti AK, Bharatam PV. Design, synthesis, biological evaluation and toxicity studies of N,N-disubstituted biguanides as quorum sensing inhibitors. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1255-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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35
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Seth K, Garg SK, Kumar R, Purohit P, Meena VS, Goyal R, Banerjee UC, Chakraborti AK. 2-(2-Arylphenyl)benzoxazole As a Novel Anti-Inflammatory Scaffold: Synthesis and Biological Evaluation. ACS Med Chem Lett 2014; 5:512-6. [PMID: 24900871 DOI: 10.1021/ml400500e] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Accepted: 02/17/2014] [Indexed: 11/30/2022] Open
Abstract
The 2-(2-arylphenyl)benzoxazole moiety has been found to be a new and selective ligand for the enzyme cyclooxygenase-2 (COX-2). The 2-(2-arylphenyl)benzoxazoles 3a-m have been synthesized by Suzuki reaction of 2-(2-bromophenyl)benzoxazole. Further synthetic manipulation of 3f and 3i led to 3o and 3n, respectively. The compounds 3g, 3n, and 3o selectively inhibited COX-2 with selectivity index of 3n much better than that of the COX-2 selective NSAID celecoxib. The in vivo anti-inflammatory potency of 3g and 3n is comparable to that of celecoxib and the nonselective NSAID diclofenac at two different doses, and 3o showed better potency compared to these clinically used NSAIDs.
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Affiliation(s)
| | | | | | | | | | - Rohit Goyal
- Indo-Soviet
Friendship (ISF) College of Pharmacy, Moga, 142 001 Punjab, India
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36
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Seth K, Purohit P, Chakraborti AK. Cooperative Catalysis by Palladium–Nickel Binary Nanocluster for Suzuki–Miyaura Reaction of Ortho-Heterocycle-Tethered Sterically Hindered Aryl Bromides. Org Lett 2014; 16:2334-7. [DOI: 10.1021/ol500587m] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Kapileswar Seth
- Department
of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Priyank Purohit
- Department
of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Asit K. Chakraborti
- Department
of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
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37
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Shah P, Dhameliya TM, Bansal R, Nautiyal M, Kommi DN, Jadhavar PS, Sridevi JP, Yogeeswari P, Sriram D, Chakraborti AK. N-Arylalkylbenzo[d]thiazole-2-carboxamides as anti-mycobacterial agents: design, new methods of synthesis and biological evaluation. Med Chem Commun 2014. [DOI: 10.1039/c4md00224e] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Benzothiazole-2-carboxyarylalkylamides are reported as a new class of potent anti-mycobacterial agents.
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Affiliation(s)
- Parth Shah
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- , India
| | - Tejas M. Dhameliya
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- , India
| | - Rohit Bansal
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- , India
| | - Manesh Nautiyal
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- , India
| | - Damodara N. Kommi
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- , India
| | - Pradeep S. Jadhavar
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- , India
| | - Jonnalagadda Padma Sridevi
- Department of Pharmacy
- Birla Institute of Technology & Science – Pilani
- Hyderabad Campus
- Hyderabad 500 078, India
| | - Perumal Yogeeswari
- Department of Pharmacy
- Birla Institute of Technology & Science – Pilani
- Hyderabad Campus
- Hyderabad 500 078, India
| | - Dharmarajan Sriram
- Department of Pharmacy
- Birla Institute of Technology & Science – Pilani
- Hyderabad Campus
- Hyderabad 500 078, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- , India
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38
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Bhagat S, Shah P, Garg SK, Mishra S, Kamal Kaur P, Singh S, Chakraborti AK. α-Aminophosphonates as novel anti-leishmanial chemotypes: synthesis, biological evaluation, and CoMFA studies. Med Chem Commun 2014. [DOI: 10.1039/c3md00388d] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
α-Aminophosphonates have been identified as novel anti-leishmanial chemotypes against theL. donovanipromastigote with low μM range activity.
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Affiliation(s)
- Srikant Bhagat
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar 160 062, India
| | - Parth Shah
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar 160 062, India
| | - Sanjeev K. Garg
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar 160 062, India
| | - Shweta Mishra
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar 160 062, India
| | - Preet Kamal Kaur
- Department of Biotechnology
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar 160 062, India
| | - Sushma Singh
- Department of Biotechnology
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar 160 062, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar 160 062, India
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39
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Affiliation(s)
- Damodara N. Kommi
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, Punjab 160 062, India
| | - Dinesh Kumar
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, Punjab 160 062, India
| | - Kapileswar Seth
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, Punjab 160 062, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar, Punjab 160 062, India
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40
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Kumar D, Kommi DN, Chebolu R, Garg SK, Kumar R, Chakraborti AK. Selectivity control during the solid supported protic acids catalysed synthesis of 1,2-disubstituted benzimidazoles and mechanistic insight to rationalize selectivity. RSC Adv 2013. [DOI: 10.1039/c2ra21994h] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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41
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Seth K, Roy SR, Pipaliya BV, Chakraborti AK. Synergistic dual activation catalysis by palladium nanoparticles for epoxide ring opening with phenols. Chem Commun (Camb) 2013; 49:5886-8. [DOI: 10.1039/c3cc42507j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Kumar D, Seth K, Kommi DN, Bhagat S, Chakraborti AK. Surfactant micelles as microreactors for the synthesis of quinoxalines in water: scope and limitations of surfactant catalysis. RSC Adv 2013. [DOI: 10.1039/c3ra41038b] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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43
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Banoth L, Narayan TK, Pujala B, Chakraborti AK, Banerjee UC. New chemo-enzymatic synthesis of (R)-1-chloro-3-(piperidin-1-yl) propan-2-ol. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.10.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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44
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Chebolu R, Kommi DN, Kumar D, Bollineni N, Chakraborti AK. Hydrogen-Bond-Driven Electrophilic Activation for Selectivity Control: Scope and Limitations of Fluorous Alcohol-Promoted Selective Formation of 1,2-Disubstituted Benzimidazoles and Mechanistic Insight for Rationale of Selectivity. J Org Chem 2012; 77:10158-67. [DOI: 10.1021/jo301793z] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rajesh Chebolu
- Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Damodara N. Kommi
- Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Dinesh Kumar
- Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Narendra Bollineni
- Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Asit K. Chakraborti
- Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
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45
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Kumar D, Kommi DN, Chopra P, Ansari MI, Chakraborti AK. L-Proline-Catalyzed Activation of Methyl Ketones or Active Methylene Compounds and DMF-DMA for Syntheses of (2E)-3-Dimethylamino-2- propen-1-ones. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200778] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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46
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Sarkar A, Raha Roy S, Kumar D, Madaan C, Rudrawar S, Chakraborti AK. Lack of correlation between catalytic efficiency and basicity of amines during the reaction of aryl methyl ketones with DMF-DMA: an unprecedented supramolecular domino catalysis. Org Biomol Chem 2012; 10:281-6. [DOI: 10.1039/c1ob06043k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Pujala B, Rana S, Chakraborti AK. Zinc Tetrafluoroborate Hydrate as a Mild Catalyst for Epoxide Ring Opening with Amines: Scope and Limitations of Metal Tetrafluoroborates and Applications in the Synthesis of Antihypertensive Drugs (RS)/(R)/(S)-Metoprolols. J Org Chem 2011; 76:8768-80. [DOI: 10.1021/jo201473f] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Brahmam Pujala
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Shivani Rana
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
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48
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Kaler A, Meena VS, Singh M, Pujala B, Chakraborti AK, Banerjee UC. Lipase-mediated kinetic resolution of (RS)-1-bromo-3-[4-(2-methoxy-ethyl)-phenoxy]-propan-2-ol to (R)-1-bromo-3-(4-(2-methoxyethyl) phenoxy) propan-2-yl acetate. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.08.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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49
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Sarkar A, Roy SR, Parikh N, Chakraborti AK. Nonsolvent Application of Ionic Liquids: Organo-Catalysis by 1-Alkyl-3-methylimidazolium Cation Based Room-Temperature Ionic Liquids for Chemoselective N-tert-Butyloxycarbonylation of Amines and the Influence of the C-2 Hydrogen on Catalytic Efficiency. J Org Chem 2011; 76:7132-40. [DOI: 10.1021/jo201102q] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anirban Sarkar
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Sudipta Raha Roy
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Naisargee Parikh
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar 160 062, Punjab, India
| | - Asit K. Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar 160 062, Punjab, India
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50
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Parikh N, Kumar D, Roy SR, Chakraborti AK. Surfactant mediated oxygen reuptake in water for green aerobic oxidation: mass-spectrometric determination of discrete intermediates to correlate oxygen uptake with oxidation efficiency. Chem Commun (Camb) 2011; 47:1797-9. [DOI: 10.1039/c0cc03166f] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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