1
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Meena N, Nipate DS, Swami PN, Rangan K, Kumar A. Ru(II)-Catalyzed [4 + 2]-Annulation of 2-Alkenyl/Arylimidazoles with N-Substituted Maleimides and 1,4-Naphthoquinones: Access to Imidazo-Fused Polyheterocycles. J Org Chem 2024; 89:2272-2282. [PMID: 38305185 DOI: 10.1021/acs.joc.3c02229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
Synthesis of imidazo-fused polyheterocyclic molecular frameworks, viz. imidazo[1,2-a]pyrrolo[3,4-e]pyridines, imidazo[2,1-a]pyrrolo[3,4-c]isoquinolines, and benzo[g]imidazo[1,2-a]quinoline-6,11-diones, has been achieved by the ruthenium(II)-catalyzed [4 + 2] C-H/N-H annulation of 2-alkenyl/2-arylimidazoles with N-substituted maleimides and 1,4-naphthoquinones. The developed protocol is operationally simple, exhibits broad substrate scope with excellent functional group tolerance, and provides the desired products in moderate to good yields. The mechanistic studies suggest that the reaction involves the formation of a C-C bond through Ru-catalyzed C(sp2)-H bond activation followed by intramolecular cyclization.
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Affiliation(s)
- Neha Meena
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani, Rajasthan 333031, India
| | - Dhananjay S Nipate
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani, Rajasthan 333031, India
| | - Prakash N Swami
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani, Rajasthan 333031, India
| | - Krishnan Rangan
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad, Telangana 500078, India
| | - Anil Kumar
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani, Rajasthan 333031, India
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2
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Wu Z, Lv G, Zheng L, Tang J, Chen J, Liu J, Li H, Wu Y. Mild construction of N-fused polycyclic compounds via Rh(III)/EosinY co-catalyze C−H activation. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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3
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Diastereoselective synthesis and spectral characterization of trans-4,4a-dihydro-3H-benzo[4,5]oxazolo[3,2-a]pyridines. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Radix S, Hallé F, Mahiout Z, Teissonnière A, Bouchez G, Auberger L, Barret R, Lomberget T. A journey through Hemetsberger‐Knittel, Leimgruber‐Batcho and Bartoli reactions: access to several hydroxy 5‐ and 6‐azaindoles. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | | | | | | | | | | | - Thierry Lomberget
- Université de Lyon, Université Lyon 1, CNRS UMR 5246 Institut de Chimie et Biochimie Moléculaires et Supramoléculaires (ICBMS), Faculté de Pharmacie-ISPB, 8, Avenue Rockefeller, F-69373, Lyon, Cedex 08, France FRANCE
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5
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Serykh VY, Ushakov IA, Borodina TN, Smirnov VI, Rozentsveig IB. New Approach to the Synthesis of 2‐Sulfonylaminosubstituted Imidazo[1,2‐ a]pyridines via the Cascade Reaction of N‐(1‐aryl‐2,2,2‐trichloroethyl)sulfonamides with 2‐Aminopyridines. ChemistrySelect 2019. [DOI: 10.1002/slct.201902838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Valery Yu. Serykh
- A. E. Favorsky Irkutsk Institute of ChemistrySiberian Branch of the Russian Academy of Sciences Favorsky Str., 1 Irkutsk 664033 Russia
| | - Igor A. Ushakov
- Irkutsk National Research Technical University Irkutsk 664074 Russia
| | - Tatyana N. Borodina
- A. E. Favorsky Irkutsk Institute of ChemistrySiberian Branch of the Russian Academy of Sciences Favorsky Str., 1 Irkutsk 664033 Russia
| | - Vladimir I. Smirnov
- A. E. Favorsky Irkutsk Institute of ChemistrySiberian Branch of the Russian Academy of Sciences Favorsky Str., 1 Irkutsk 664033 Russia
| | - Igor B. Rozentsveig
- A. E. Favorsky Irkutsk Institute of ChemistrySiberian Branch of the Russian Academy of Sciences Favorsky Str., 1 Irkutsk 664033 Russia
- Irkutsk State University Karl Marx Str., 1 Irkutsk 664003 Russia
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6
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Liu Y, Zhang Y, Sun J. Copper‐Promoted Annulation of Terminal Alkynes with 2‐Aminopyridines to Assemble 2‐Halogenated Imidazo[1,2‐
a
]pyridines. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3660] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Yun Liu
- School of Chemistry and Material ScienceJiangsu Normal University Xuzhou 221116 Jiangsu People's Republic of China
| | - Yuxuan Zhang
- School of Chemistry and Material ScienceJiangsu Normal University Xuzhou 221116 Jiangsu People's Republic of China
| | - Jinwei Sun
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing University of Information Science & Technology Nanjing 210044 Jiangsu People's Republic of China
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7
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Bourichi S, Kandri Rodi Y, Hökelek T, Chakroune S, Ouzidan Y, Capet F. 6-Bromo-2-(4-chlorophenyl)-3-[(1-octyl-1 H-1,2,3-triazol-4-yl)methyl]-3 H-imidazo[4,5- b]pyridine. IUCRDATA 2019. [DOI: 10.1107/s2414314619000531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
In the title compound, C23H26BrClN6, the imidazo[4,5-b]pyridine ring system (r.m.s. deviation = 0.012 Å) is inclined at angles of 19.37 (12) and 89.27 (13)° to the phenyl and triazole rings, respectively, while the phenyl and triazole rings subtend a dihedral angle of 71.23 (15)°. In the crystal, the molecules are linked by C—H...NI and bifurcated C—H...(NT,NT) (I = imidazo[4,5-b]pyridine and T = triazole) hydrogen bonds into a double-column structure propagating along the b-axis direction.
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8
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Guo X, Wang L, Hu J, Zhang M. CuI nanoparticle-catalyzed synthesis of tetracyclic benzo[ e]benzo[4,5]imidazo[1,2- c][1,3]thiazin-6-imine heterocycles by S NAr-type C-S, C-N bond formation from isothiocyanatobenzenes and benzimidazoles. RSC Adv 2018; 8:22259-22267. [PMID: 35541714 PMCID: PMC9081286 DOI: 10.1039/c8ra02552e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Accepted: 06/04/2018] [Indexed: 11/21/2022] Open
Abstract
In this paper, a simple and practical synthesis of benzo[e]benzo[4,5]imidazo[1,2-c][1,3]thiazin-6-imine tetracyclic heterocycles via a CuI nanoparticle-catalyzed intramolecular C(sp2)-S coupling reaction is presented. This strategy provides a straightforward method for synthesizing analogs of the anti-HIV drug 3,4-dihydro-2H,6H-pyrimido[1,2-c][1,3]benzothiazin-6-imine (PD 404182). The reaction rate and yield were increased by employing CuI nanoparticles.
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Affiliation(s)
- Xiaolong Guo
- Department of Chemistry, Capital Normal University Beijing 100048 China
| | - Luyao Wang
- Department of Chemistry, Capital Normal University Beijing 100048 China
| | - Jing Hu
- Department of Chemistry, Capital Normal University Beijing 100048 China
| | - Mengmeng Zhang
- Department of Chemistry, Capital Normal University Beijing 100048 China
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Jana K, Bandyopadhyay T, Ganguly B. Designed inhibitors with hetero linkers for gastric proton pump H +,K +-ATPase: Steered molecular dynamics and metadynamics studies. J Mol Graph Model 2017; 78:129-138. [PMID: 29055186 DOI: 10.1016/j.jmgm.2017.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 10/06/2017] [Accepted: 10/09/2017] [Indexed: 02/07/2023]
Abstract
Acid suppressant SCH28080 and its derivatives reversibly reduce acid secretion activity of the H+,K+-ATPase in a K+ competitive manner. The results on homologation of the SCH28080 by varying the linker chain length suggested the improvement in efficacy. However, the pharmacokinetic studies reveal that the hydrophobic nature of the CH2 linker units may not help it to function as a better acid suppressant. We have exploited the role of linker unit to enhance the efficacy of such reversible acid suppressant drug molecules using hetero linker, i.e., disulfide and peroxy linkers. The logarithm of partition coefficient defined for a drug molecule relates to the partition coefficient, which allows the optimum solubility characteristics to reach the active site. The logarithm of partition coefficient calculated for the designed inhibitors suggests that inhibitors would possibly reach the active site in sufficient concentration like in the case of SCH28080. The steered molecular dynamics studies have revealed that the Inhibitor-1 with disulfide linker unit is more stable at the active site due to greater noncovalent interactions compared to the SCH28080. Centre of mass distance analysis suggests that the Cysteine-813 amino acid residue selectively plays an important role in the inhibition of H+,K+-ATPase for Inhibitor-1. Furthermore, the quantum chemical calculations with M11L/6-31+G(d,p) level of theory have been performed to account the noncovalent interactions responsible for the stabilization of inhibitor molecules in the active site gorge of the gastric proton pump at different time scale. The hydrogen bonding and hydrophobic interaction studies corroborate the center of mass distance analysis as well. Well-tempered metadynamics free energy surface and center of mass separation analysis for the Inhibitor-1 is in good agreement with the steered molecular dynamics results. The torsional angle of the linker units seems to be crucial for better efficacy of drug molecules. The torsional angle of linker units of SCH28080 (COCH2C) and of Inhibitor 1 (CSSC) prefers to lie within ∼60°-90° for a longer time during the simulations, whereas, the peroxy linker (COOC) of Inhibitor 2 prefers to adopt ∼120-160°. Therefore, it appears that the smaller torsion angle of linker units can achieve better interactions with the active site residues of H+,K+-ATPase to inhibit the acid secretion activity. The reversible drug molecules with disulfide linker unit would be a promising candidate as proton pump antagonist to H+,K+-ATPase.
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Affiliation(s)
- Kalyanashis Jana
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR, Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, Gujarat, India; Academy of Scientific and Innovative Research, CSIR, CSMCRI, Bhavnagar 364002, Gujarat, India
| | - Tusar Bandyopadhyay
- Theoretical Chemistry Section, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
| | - Bishwajit Ganguly
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR, Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, Gujarat, India; Academy of Scientific and Innovative Research, CSIR, CSMCRI, Bhavnagar 364002, Gujarat, India.
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10
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Bourichi S, Kandri Rodi Y, Ouzidan Y, Mague JT, Essassi EM, Zouihri H. 6-Bromo-2-(4-chlorophenyl)-3-methyl-3 H-imidazo[4,5- b]pyridine. IUCRDATA 2016. [DOI: 10.1107/s241431461600763x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
In the title compound, C13H9BrClN3, the imidazopyridine fused-ring system is almost planar, with r.m.s. deviation of 0.006 (19) Å, and makes a dihedral angle of 29.32 (8)° with the mean plane of the 4-chlorophenyl group. In the crystal, C—H...N hydrogen bonds link the molecules into chains propagating in the [100] direction. Weak intermolecular π–π interactions between the five- and six-membered rings of the 3H-imidazo[4,5-b]pyridine moieties of neighbouring molecules [centroid–centroid distance = 3.8648 (12) Å] further consolidate the packing into layers parallel to theabplane.
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11
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Rogoza LN, Salakhutdinov NF. Anti-ulcer agents: chemical aspect of solving the problem. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4430] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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12
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Chandrasekhara Rao L, Satish Kumar N, Meshram HM. Microwave assisted novel and regioselective functionalization of imidazopyridines with chromene acetals and β-nitrostyrenes. RSC Adv 2015. [DOI: 10.1039/c5ra14674g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A facile synthesis of novel functionalized imidazopyridines has been accomplished through the condensation of imidazopyridines with chromene hemiacetals or β-nitro styrenes with high regioselectivity and excellent yields in the presence of a catalytic amount of PTSA or InCl3.
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Affiliation(s)
- L. Chandrasekhara Rao
- Medicinal Chemisty and Pharmacology Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad – 500 007
- India
| | - N. Satish Kumar
- Medicinal Chemisty and Pharmacology Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad – 500 007
- India
| | - H. M. Meshram
- Medicinal Chemisty and Pharmacology Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad – 500 007
- India
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13
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Yang F, An W, Qian Z, Yu T, Du Y, Ma L, Wang X, Meng T, Shen J. Ga(OTf)3-promoted synthesis of functionalized 2-carbonyl-imidazo[1,2-a]pyridines derived from ethyl α-benzotriazolyl-α-morpholinoacetate. RSC Adv 2015. [DOI: 10.1039/c5ra02809d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesis of functionalized 2-carbonyl-imidazo[1,2-a]pyridines derived from ethyl α-benzotriazolyl-α-morpholinoacetate.
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Affiliation(s)
- Fengxia Yang
- School of Chemistry and Pharmaceutical Engineering
- Qilu University of Technology
- Jinan 250353
- China
- State Key Laboratory of Drug Research
| | - Weiteng An
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Zhiwei Qian
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Ting Yu
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Yongli Du
- School of Chemistry and Pharmaceutical Engineering
- Qilu University of Technology
- Jinan 250353
- China
| | - Lanping Ma
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Xin Wang
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Tao Meng
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
| | - Jingkang Shen
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
- China
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14
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Ortho-substituent effect promoted rapid cleavage of amide C–N bond under mild conditions. RESEARCH ON CHEMICAL INTERMEDIATES 2014. [DOI: 10.1007/s11164-013-1140-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Koubachi J, El Kazzouli S, Bousmina M, Guillaumet G. Functionalization of Imidazo[1,2-a]pyridines by Means of Metal-Catalyzed Cross-Coupling Reactions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400065] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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16
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Hiebel MA, Fall Y, Scherrmann MC, Berteina-Raboin S. Straightforward Synthesis of Various 2,3-Diarylimidazo[1,2-a]pyridines in PEG400Medium through One-Pot Condensation and C-H Arylation. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402079] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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17
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Patil SM, Mascarenhas M, Sharma R, Mohana Roopan S, Roychowdhury A. Microwave-Assisted One-Pot Synthesis of Substituted 3-Bromoimidazo[1,2-a]pyridines and Imidazoheterocycles. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.1764] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shashikant M. Patil
- Department of Medicinal Chemistry; Piramal Healthcare Ltd.; 1-Nirlon Complex, Goregaon (East) Mumbai 400063 India
| | - Malcolm Mascarenhas
- Department of Medicinal Chemistry; Piramal Healthcare Ltd.; 1-Nirlon Complex, Goregaon (East) Mumbai 400063 India
| | - Rajiv Sharma
- Department of Medicinal Chemistry; Piramal Healthcare Ltd.; 1-Nirlon Complex, Goregaon (East) Mumbai 400063 India
| | - S. Mohana Roopan
- Organic Chemistry Division, School of Advanced Sciences; VIT University; Vellore-632014 Tamil Nadu India
| | - Abhijit Roychowdhury
- Department of Medicinal Chemistry; Piramal Healthcare Ltd.; 1-Nirlon Complex, Goregaon (East) Mumbai 400063 India
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Qian Z, Yang A, An W, Yu T, Wang X, Zhang Y, Shen J, Meng T. An efficient synthesis of novel dibenzoxdiazepine-fused heterocycles through a multicomponent reaction. RSC Adv 2014. [DOI: 10.1039/c4ra09196e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A one-pot synthesis of 6-oxa-2,2a1,11-triazadibenzo[cd,g]azulenes by a three-component reaction of a 2-aminoheterocycle, aldehydes, and 2-isocyanophenyl acetate is presented.
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Affiliation(s)
- Zhiwei Qian
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
| | - Anjiang Yang
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
| | - Weiteng An
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
| | - Ting Yu
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
| | - Xin Wang
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
| | - Yongliang Zhang
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
| | - Jingkang Shen
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
| | - Tao Meng
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203, PR China
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Pandey AK, Sharma R, Singh A, Shukla S, Srivastava K, Puri SK, Kumar B, Chauhan PMS. Synthesis of biologically active pyridoimidazole/imidazobenzothiazole annulated polyheterocycles using cyanuric chloride in water. RSC Adv 2014. [DOI: 10.1039/c4ra03415e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient and mild protocol for rapid access to N-fused polyheterocycles via Pictet–Spengler type 6-endo cyclization by cyanuric chloride in aqueous medium has been developed.
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Affiliation(s)
- Anand Kumar Pandey
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Rashmi Sharma
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Awantika Singh
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Sanjeev Shukla
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Kumkum Srivastava
- Division of Parasitology
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Sunil K. Puri
- Division of Parasitology
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Brijesh Kumar
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Prem M. S. Chauhan
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow, India
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Sun H, Zhou H, Khorev O, Jiang R, Yu T, Wang X, Du Y, Ma Y, Meng T, Shen J. Three-Component, One-Pot Sequential Synthesis of Functionalized Cyclazines: 3H-1,2a1,3-Triazaacenaphthylenes. J Org Chem 2012; 77:10745-51. [DOI: 10.1021/jo3021105] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hongpeng Sun
- School of Chemistry and Pharmaceutical Engineering, Shandong Polytechnic University, Jinan 250353, P.R. China
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Rozentsveig IB, Serykh VY, Chernysheva GN, Chernyshev KA, Kondrashov EV, Tretyakov EV, Romanenko GV. One-Pot Synthesis ofN-(Imidazo[1,2-a]pyridin-3-yl)- andN-(Imidazo[2,1-b][1,3]thiazol-5-yl)sulfonamides. European J Org Chem 2012. [DOI: 10.1002/ejoc.201201006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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22
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Straightforward and efficient synthesis of 3-benzyloxy-4-bromopicolinate ester and 3-benzyloxy-5-bromopicolinate ester, common building blocks for pharmaceuticals and agrochemicals. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.09.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Abstract
The use of Quantitative Structure-Activity Relationship models to address problems in drug discovery has a mixed history, generally resulting from the misapplication of QSAR models that were either poorly constructed or used outside of their domains of applicability. This situation has motivated the development of a variety of model performance metrics (r(2), PRESS r(2), F-tests, etc.) designed to increase user confidence in the validity of QSAR predictions. In a typical workflow scenario, QSAR models are created and validated on training sets of molecules using metrics such as Leave-One-Out or many-fold cross-validation methods that attempt to assess their internal consistency. However, few current validation methods are designed to directly address the stability of QSAR predictions in response to changes in the information content of the training set. Since the main purpose of QSAR is to quickly and accurately estimate a property of interest for an untested set of molecules, it makes sense to have a means at hand to correctly set user expectations of model performance. In fact, the numerical value of a molecular prediction is often less important to the end user than knowing the rank order of that set of molecules according to their predicted end point values. Consequently, a means for characterizing the stability of predicted rank order is an important component of predictive QSAR. Unfortunately, none of the many validation metrics currently available directly measure the stability of rank order prediction, making the development of an additional metric that can quantify model stability a high priority. To address this need, this work examines the stabilities of QSAR rank order models created from representative data sets, descriptor sets, and modeling methods that were then assessed using Kendall Tau as a rank order metric, upon which the Shannon entropy was evaluated as a means of quantifying rank-order stability. Random removal of data from the training set, also known as Data Truncation Analysis (DTA), was used as a means for systematically reducing the information content of each training set while examining both rank order performance and rank order stability in the face of training set data loss. The premise for DTA ROE model evaluation is that the response of a model to incremental loss of training information will be indicative of the quality and sufficiency of its training set, learning method, and descriptor types to cover a particular domain of applicability. This process is termed a "rank order entropy" evaluation or ROE. By analogy with information theory, an unstable rank order model displays a high level of implicit entropy, while a QSAR rank order model which remains nearly unchanged during training set reductions would show low entropy. In this work, the ROE metric was applied to 71 data sets of different sizes and was found to reveal more information about the behavior of the models than traditional metrics alone. Stable, or consistently performing models, did not necessarily predict rank order well. Models that performed well in rank order did not necessarily perform well in traditional metrics. In the end, it was shown that ROE metrics suggested that some QSAR models that are typically used should be discarded. ROE evaluation helps to discern which combinations of data set, descriptor set, and modeling methods lead to usable models in prioritization schemes and provides confidence in the use of a particular model within a specific domain of applicability.
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Kotha S, Krishna NG, Halder S, Misra S. A synergistic approach to polycyclics via a strategic utilization of Claisen rearrangement and olefin metathesis. Org Biomol Chem 2011; 9:5597-624. [PMID: 21727970 DOI: 10.1039/c1ob05413a] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Olefin metathesis promoted by a well-defined metal carbene complex has evolved into an efficient method for the construction of a broad range of carbocyclic and heterocyclic rings of varying size. The synthetic potential of the olefin metathesis has been further increased by combining various other C-C bond forming processes either in tandem or in sequence. Herein, application of Claisen rearrangement and olefin metathesis to prepare various intricate and/or biologically important targets has been described.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai, India.
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Highly enantioselective synthesis of α-trichloromethyldihydropyrans catalyzed by bifunctional organocatalysts. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.01.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Chen D, Liu Y, Zhang S, Guo D, Liu C, Li S, Gong P. Synthesis and in-vitro anti-hepatitis B virus activity of ethyl 6-bromo-8-hydroxyimidazo[1,2-a]pyridine-3-carboxylates. Arch Pharm (Weinheim) 2010; 344:158-64. [PMID: 21384414 DOI: 10.1002/ardp.201000045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Accepted: 04/07/2010] [Indexed: 01/31/2023]
Abstract
A series of ethyl 6-bromo-8-hydroxyimidazo[1,2-a]pyridine-3-carboxylate derivatives were synthesized and evaluated for their anti-hepatitis B virus (HBV) activity and cytotoxicity in HepG2.2.15 cells. Nearly half of the tested compounds were proved to be highly effective in inhibiting the replication of HBV DNA with IC(50) values ranging from 1.3 to 9.1 µM. Among them, 10o and 10s were identified as the most promising compounds.
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Affiliation(s)
- Dong Chen
- Key Laboratory of Original New Drugs Design and Discovery of Ministry of Education, School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, P.R. China
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Palmer AM, Chiesa V, Schmid A, Münch G, Grobbel B, Zimmermann PJ, Brehm C, Buhr W, Simon WA, Kromer W, Postius S, Volz J, Hess D. Tetrahydrochromenoimidazoles as Potassium-Competitive Acid Blockers (P-CABs): Structure−Activity Relationship of Their Antisecretory Properties and Their Affinity toward the hERG Channel. J Med Chem 2010; 53:3645-74. [PMID: 20380432 DOI: 10.1021/jm100040c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Andreas M. Palmer
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Vittoria Chiesa
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Anja Schmid
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Gabriela Münch
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Burkhard Grobbel
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Peter J. Zimmermann
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Christof Brehm
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Wilm Buhr
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Wolfgang-Alexander Simon
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Wolfgang Kromer
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Stefan Postius
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Jürgen Volz
- NYCOMED GmbH, Departments of Medicinal Chemistry, Biochemistry, Pharmacology, and Physicochemistry, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany
| | - Dietmar Hess
- NMI TT GmbH, Markwiesenstrasse 55, D-72770 Reutlingen, Germany
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Palmer AM, Münch G, Grobbel B, Kromer W. Synthesis and pharmacological evaluation of potential metabolites of the potassium-competitive acid blocker BYK405879. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.04.070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Orally active C-6 heteroaryl- and heterocyclyl-substituted imidazo[1,2-a]pyridine acid pump antagonists (APAs). Bioorg Med Chem Lett 2009; 19:3602-6. [DOI: 10.1016/j.bmcl.2009.04.127] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 04/24/2009] [Accepted: 04/25/2009] [Indexed: 01/22/2023]
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Synthesis and pharmacological evaluation of 5-carboxamide-substituted tetrahydrochromeno[7,8-d]imidazoles. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.04.071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the Year 2007. Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2008.12.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Arévalo MJ, Kielland N, Masdeu C, Miguel M, Isambert N, Lavilla R. Multicomponent Access to Functionalized Mesoionic Structures Based on TFAA Activation of Isocyanides: Novel Domino Reactions. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801084] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bamford M. 3 H+/K+ ATPase Inhibitors in the Treatment of Acid-Related Disorders. PROGRESS IN MEDICINAL CHEMISTRY 2009; 47:75-162. [DOI: 10.1016/s0079-6468(08)00203-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Palmer AM, Chrismann S, Münch G, Brehm C, Zimmermann PJ, Buhr W, Senn-Bilfinger J, Feth MP, Simon WA. Spiro(imidazo[1,2-a]pyrano[2,3-c]pyridine-9-indenes) as inhibitors of gastric acid secretion. Bioorg Med Chem 2009; 17:368-84. [DOI: 10.1016/j.bmc.2008.10.055] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Accepted: 10/23/2008] [Indexed: 01/14/2023]
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Palmer AM, Webel M, Scheufler C, Haag D, Müller B. Large-Scale Asymmetric Synthesis of the 3,6,7,8-Tetrahydrochromeno[7,8-d]imidazole BYK 405879: A Promising Candidate for the Treatment of Acid-Related Diseases. Org Process Res Dev 2008. [DOI: 10.1021/op800177x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Andreas M. Palmer
- NYCOMED GmbH, Department of Medicinal Chemistry and NYCOMED GmbH, Department of Process Chemistry Research, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany, and NYCOMED GmbH, Department of Process Chemistry Development, Robert-Bosch-Strasse 8, D-78224 Singen, Germany
| | - Matthias Webel
- NYCOMED GmbH, Department of Medicinal Chemistry and NYCOMED GmbH, Department of Process Chemistry Research, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany, and NYCOMED GmbH, Department of Process Chemistry Development, Robert-Bosch-Strasse 8, D-78224 Singen, Germany
| | - Christian Scheufler
- NYCOMED GmbH, Department of Medicinal Chemistry and NYCOMED GmbH, Department of Process Chemistry Research, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany, and NYCOMED GmbH, Department of Process Chemistry Development, Robert-Bosch-Strasse 8, D-78224 Singen, Germany
| | - Dieter Haag
- NYCOMED GmbH, Department of Medicinal Chemistry and NYCOMED GmbH, Department of Process Chemistry Research, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany, and NYCOMED GmbH, Department of Process Chemistry Development, Robert-Bosch-Strasse 8, D-78224 Singen, Germany
| | - Bernd Müller
- NYCOMED GmbH, Department of Medicinal Chemistry and NYCOMED GmbH, Department of Process Chemistry Research, Byk-Gulden-Strasse 2, D-78467 Konstanz, Germany, and NYCOMED GmbH, Department of Process Chemistry Development, Robert-Bosch-Strasse 8, D-78224 Singen, Germany
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Synthesis of enantiopure 3,6,7,8-tetrahydrochromeno[7,8-d]imidazoles via asymmetric ketone hydrogenation in the presence of RuCl2[Xyl-P-Phos][DAIPEN]. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.08.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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37
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Palmer AM, Zanotti-Gerosa A, Nedden H. Preparation of tricyclic imidazopyridines by asymmetric ketone hydrogenation in the presence of RuCl2[(S)-Xyl-P-Phos][(S)-DAIPEN]. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.05.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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