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Cazzador G, Manzato L, Ronchin L, Sadraoui C, Vavasori A, Zanella M. A New Sustainable Multistep Catalytic Process from Benzene to Caprolactam: Amination, Hydroximation and Beckmann Rearrangement Promoted and Catalyzed by Trifluoroacetic Acid. Catal Letters 2022; 153:1-12. [PMID: 36320430 PMCID: PMC9607771 DOI: 10.1007/s10562-022-04207-9] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 10/17/2022] [Indexed: 11/30/2022]
Abstract
Here we report some results on a 3 steps benzene caprolactam process via amination, aniline Hydroxymation and Beckmann rearrangement. The amination proceeds with hydroxylamine trifluoroacetate, with 97% of conversion and selectivity of 90%, catalyzed by V compounds. We achieve 98% of conversion and 95% of selectivity in the hydroxymation of aniline in the presence of hydroxylamine trifluoroacetate, sulfonic resin and Pd/C. While in the absence of the resin, hydrogenation of hydroxylamine trifluoroacetate occurs readily to the ammonium salt. The reaction occurs likely by the exchanged hydroxylamine and the aniline reduction intermediate. The use of hydroxylamine trifluoroacetate, instead of the chloride, favors the sustainability of the process by avoiding the ammonium chloride formation. The absence of salt except those derived from the trifluoroacetic acid allows a complete reuse of the trifluoroacetic acid and the only byproduct is ammonium nitrate obtained by resin regeneration. Beckmann rearrangement of the so produced cyclohexanone oxime occurs easily after diethyl ether evaporation and additions of a solution trifluoroacetic acid acetonitrile in high yield and selectivity. Graphical Abstract New three steps caprolactam process via benzene amination and aniline hydrogenation. Supplementary Information The online version contains supplementary material available at 10.1007/s10562-022-04207-9.
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Affiliation(s)
- G. Cazzador
- Department of Molecular Sciences and Nanosystems, University Ca’ Foscari of Venice, via Torino155, Mestre, 30170 Venezia, Italy
| | - L. Manzato
- Department of Molecular Sciences and Nanosystems, University Ca’ Foscari of Venice, via Torino155, Mestre, 30170 Venezia, Italy
| | - L. Ronchin
- Department of Molecular Sciences and Nanosystems, University Ca’ Foscari of Venice, via Torino155, Mestre, 30170 Venezia, Italy
| | - C. Sadraoui
- Department of Molecular Sciences and Nanosystems, University Ca’ Foscari of Venice, via Torino155, Mestre, 30170 Venezia, Italy
| | - A. Vavasori
- Department of Molecular Sciences and Nanosystems, University Ca’ Foscari of Venice, via Torino155, Mestre, 30170 Venezia, Italy
| | - M. Zanella
- Department of Molecular Sciences and Nanosystems, University Ca’ Foscari of Venice, via Torino155, Mestre, 30170 Venezia, Italy
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Ren C, Zhang H, Chen Z, Gao J, Yang M, Yuan Z, Li X. A Novel Utilization of Water Extract of Suaeda Salsa in the Pd/C Catalyzed Suzuki-Miyaura Coupling Reaction. Molecules 2022; 27:molecules27196623. [PMID: 36235160 PMCID: PMC9573658 DOI: 10.3390/molecules27196623] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/01/2022] [Accepted: 10/03/2022] [Indexed: 11/28/2022] Open
Abstract
Using biomass-derived solvents in various organic reactions is challenging for the fine chemicals industry. We herein report a Pd/C catalyzed Suzuki-Miyaura reaction in water extract of suaeda salsa (WES) without using external phosphine ligand, base, and organic solvent. The cross-coupling reactions were carried out in a basic WES medium with a broad substrate scope and wide functional group tolerance. Furthermore, the high purity of solid biaryl products can be obtained by column chromatography or filtration.
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Affiliation(s)
- Changyue Ren
- College of Pharmacy, Zunyi Medical University, Zunyi 563003, China
| | - Hang Zhang
- College of Pharmacy, Zunyi Medical University, Zunyi 563003, China
| | - Zhengjun Chen
- College of Pharmacy, Zunyi Medical University, Zunyi 563003, China
| | - Jie Gao
- College of Pharmacy, Zunyi Medical University, Zunyi 563003, China
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
- Guizhou International Scientific and Technological Cooperation Base for Medical Photo-Theranostics Technology and Innovative Drug Development, Zunyi 563003, China
- Correspondence: (J.G.); (Z.Y.); (X.L.)
| | - Mingyan Yang
- College of Pharmacy, Zunyi Medical University, Zunyi 563003, China
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
- Guizhou International Scientific and Technological Cooperation Base for Medical Photo-Theranostics Technology and Innovative Drug Development, Zunyi 563003, China
| | - Zeli Yuan
- College of Pharmacy, Zunyi Medical University, Zunyi 563003, China
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
- Guizhou International Scientific and Technological Cooperation Base for Medical Photo-Theranostics Technology and Innovative Drug Development, Zunyi 563003, China
- Correspondence: (J.G.); (Z.Y.); (X.L.)
| | - Xinmin Li
- College of Pharmacy, Zunyi Medical University, Zunyi 563003, China
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563000, China
- Guizhou International Scientific and Technological Cooperation Base for Medical Photo-Theranostics Technology and Innovative Drug Development, Zunyi 563003, China
- Correspondence: (J.G.); (Z.Y.); (X.L.)
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3
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Su H, Li P, Wang Y, Wu H, Ma X, Liu Y, Ma Y, Liu S, Xia C. Combination of Soxhlet extraction and catalytic hydrodebromination for remediation of tetrabromobisphenol A contaminated soil. Chemosphere 2022; 300:134545. [PMID: 35427671 DOI: 10.1016/j.chemosphere.2022.134545] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 03/25/2022] [Accepted: 04/04/2022] [Indexed: 06/14/2023]
Abstract
As a widely used brominated flame retardants (BFRs), tetrabromobisphenol A (TBBPA) has been detected in various environmental matrices and is known to cause negative effects on both the environment and human health. In this study, a combined method was developed for the abatement of TBBPA contaminated soil based on successive steps of solvent extraction (SE) and catalytic hydrodebromination (HDB) over Pd/C. The results showed that TBBPA could be efficiently extracted from the TBBPA contaminated soil with polar solvents. Subsequently, TBBPA could be completely hydrodebrominated over Pd/C in ethanol, via multistep ultimately yielding bisphenol A. Moreover, NaOH, NH3H2O, and Et3N were more favorable to promote the HDB of 4-TBBPA over Pd/C, and 100% bromide atom removal ratio of TBBPA was achieved within 40 min when [NaOH]0/[organic-Br]0 was more than 1.10 in ethanol. However, the catalytic activity of Pd/C decreased with the repeated use in ethanol. To study the mechanism for this phenomenon, fresh and used catalysts were analyzed by characterization techniques including scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and energy dispersive X-ray spectrometer (EDS). It was found that the deactivation of Pd/C catalyst caused by the gradual accumulation of NaBr could be recovered by washing with water. On the basis of these studies, an effective and practical system for the combined method of SE and catalytic HDB over Pd/C was developed to dispose BFRs contaminated soils.
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Affiliation(s)
- Heng Su
- The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, 264025, China; School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China
| | - Peng Li
- School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China
| | - Yanfei Wang
- School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China
| | - Haiyang Wu
- School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China
| | - Xuanxuan Ma
- School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China; Fujian Provincial Colleges and University Engineering Research Center of Solid Waste Resource Utilization, Longyan University, Longyan, 364012, China
| | - Ying Liu
- School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China
| | - Yunbo Ma
- The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, 264025, China; School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China
| | - Sujing Liu
- School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China.
| | - Chuanhai Xia
- The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, 264025, China; School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China.
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Avula SK, Rehman NU, Anwar MU, Aalthani G, Csuk R, Al-Harrasi A. Heterogeneous Pd/C-catalyzed, ligand free Suzuki-Miyaura coupling reaction furnishes new p-terphenyl derivatives. Nat Prod Res 2020; 36:566-570. [PMID: 32657615 DOI: 10.1080/14786419.2020.1791112] [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] [Indexed: 10/23/2022]
Abstract
A series of new para-terphenyls derivatives have been efficiently synthesized by a ligand-free heterogeneous Pd/C-catalyzed two-fold Suzuki-Miyaura coupling reaction. Methyl 5-bromo-2-iodobenzoate was selected to react with a variety of different aryl boronic acids (2a-i). Nine new p-terphenyl derivatives (3a-i) were prepared and the structures were confirmed by several analytical techniques including infrared, spectroscopy, 1H and 13C NMR spectroscopy, mass spectrometry, and in the case of compound 3 b, by X-ray diffraction method. The new derivatives were obtained in very good yields (78-91%). This synthetic facile route is envisioned to improve the preparation of p-terphenyl-based natural products.
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Affiliation(s)
- Satya Kumar Avula
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
| | - Najeeb Ur Rehman
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
| | - Muhammad U Anwar
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
| | - Ghanim Aalthani
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
| | - Rene Csuk
- Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
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Yang Y, Yang D, Zhang C, Zheng M, Duan Y. Preparation of 1-Hydroxy-2,5-hexanedione from HMF by the Combination of Commercial Pd/C and Acetic Acid. Molecules 2020; 25:molecules25112475. [PMID: 32471053 PMCID: PMC7321070 DOI: 10.3390/molecules25112475] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 05/22/2020] [Accepted: 05/25/2020] [Indexed: 01/29/2023] Open
Abstract
The development of a simple and durable catalytic system for the production of chemicals from a high concentration of a substrate is important for biomass conversion. In this manuscript, 5-hydroxymethylfurfural (HMF) was converted to 1-hydroxy-2,5-hexanedione (HHD) using the combination of commercial Pd/C and acetic acid (AcOH) in water. The influence of temperature, H2 pressure, reaction time, catalyst amount and the concentration of AcOH and HMF on this transformation was investigated. A 68% yield of HHD was able to be obtained from HMF at a 13.6 wt% aqueous solution with a 98% conversion of HMF. The resinification of intermediates on the catalyst was characterized to be the main reason for the deactivation of Pd/C. The reusability of the used Pd/C was studied to find that most of the activity could be recovered by being washed in hot tetrahydrofuran.
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Affiliation(s)
- Yanliang Yang
- Henan Key Laboratory of Function-Oriented Porous Material, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China; (D.Y.); (C.Z.); (M.Z.)
- Correspondence: ; Tel.: +86-379-6861-8320
| | - Dexi Yang
- Henan Key Laboratory of Function-Oriented Porous Material, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China; (D.Y.); (C.Z.); (M.Z.)
| | - Chi Zhang
- Henan Key Laboratory of Function-Oriented Porous Material, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China; (D.Y.); (C.Z.); (M.Z.)
| | - Min Zheng
- Henan Key Laboratory of Function-Oriented Porous Material, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China; (D.Y.); (C.Z.); (M.Z.)
| | - Ying Duan
- College of Food and Drug, Luoyang Normal University, Luoyang 471934, China;
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Laxmi DS, Vardhini SV, Guttikonda VR, Rao MVB, Pal M. Synthesis of 2-substituted Furo[3,2-b]pyridines Under Pd/C-Cu Catalysis Assisted by Ultrasound: Their Evaluation as Potential Cytotoxic Agents. Anticancer Agents Med Chem 2020; 20:932-940. [PMID: 32160853 DOI: 10.2174/1871520620666200311102304] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 08/02/2019] [Revised: 01/20/2020] [Accepted: 02/04/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Compounds containing furo[3,2-b]pyridine framework have shown interesting pharmacological properties, including anticancer activities. Though these compounds are generally synthesized via the heteroannulation processes involving acetylenic derivatives, some of them are complex. OBJECTIVE The study aimed to explore a series of 2-substituted furo[3,2-b]pyridines for their cytotoxic properties against cancer cell lines in vitro. METHODS We developed a convenient synthesis of 2-substituted furo[3,2-b]pyridines via sequential (i) C-C coupling followed by (ii) C-O bond-forming reactions in a single pot. The reactions were performed under ultrasound irradiation in the presence of Pd/C as an inexpensive, stable and widely used catalyst. A range of 2- substituted furo[3,2-b]pyridines were synthesized via coupling of 3-chloro-2-hydroxy pyridine with terminal alkynes in the presence of 10% Pd/C-CuI-PPh3-Et3N in EtOH. The in vitro evaluation of all these compounds was carried out against MDA-MB-231 and MCF-7 cell lines and subsequently against SIRT1. RESULTS The furo[3,2-b]pyridine derivative 3b showed encouraging growth inhibition of both MDAMB-231 and MCF-7 cell lines and inhibition of SIRT1. The compound 3b also showed apoptosis-inducing potential when tested against MCF-7 cells. CONCLUSION The Pd/C-Cu catalysis under ultrasound accomplished a one-pot and direct access to 2-substituted furo[3,2-b]pyridine derivatives, some of which showed anticancer properties.
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Affiliation(s)
- Dandamudi Sri Laxmi
- Department of Chemistry, Krishna University, Machilipatnam-521 001, Andhra Pradesh, India
| | - Suryadevara V Vardhini
- Department of Chemistry, Amritasai Institute of Science and Technology, Paritala, Krishna Dist., -521 180, Andhra Pradesh, India
| | - Venkata R Guttikonda
- Department of Chemistry, SRR & CVR Govt. Degree College, Vijayawada, Andhra Pradesh, India
| | - Mandava V B Rao
- Department of Chemistry, Krishna University, Machilipatnam-521 001, Andhra Pradesh, India
| | - Manojit Pal
- Dr. Reddy's Institute of Life Sciences, University of Hyderabad Campus, Hyderabad-500046, India
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Rao BVD, Vardhini SV, Kolli D, Rao MVB, Pal M. Ultrasound Assisted Synthesis of 2-Substituted Benzofurans via One-Pot and Sequential Method: Their In Vitro Evaluation. Anticancer Agents Med Chem 2020; 20:580-588. [PMID: 31994471 DOI: 10.2174/1871520620666200128120356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 05/20/2019] [Revised: 09/13/2019] [Accepted: 12/14/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND The 2-substituted benzofuran framework has attracted enormous attention due to its presence in a range of bioactive compounds and natural products. While various methods for the synthesis of 2- substituted benzofuran derivatives are known, several of them suffer from certain drawbacks. OBJECTIVE The main objective of this work was to explore a series of 2-(het)aryl substituted benzofurans derivatives for their cytotoxic properties against cancer cell lines in vitro. METHODS In our efforts, we have developed a one-pot synthesis of this class of compounds via sequential C-C coupling followed by C-Si bond cleavage and subsequent tandem C-C/C-O bond-forming reaction under ultrasound irradiation. The methodology involved coupling of (trimethylsilyl)acetylene with iodoarenes in the presence of 10% Pd/C-CuI-PPh3-Et3N in MeOH followed by treating the reaction mixture with K2CO3 in aqueous MeOH and finally coupling with 2-iodophenol. A variety of 2-substituted benzofurans were synthesized using this methodology in good yield. All the synthesized compounds were tested in vitro against two cancer cell lines, e.g. MDAMB-231 and MCF-7 cell lines subsequently against SIRT1. RESULTS The benzofuran derivative 3m showed encouraging growth inhibition of both MDAMB-231 and MCF- 7 cell lines and significant inhibition of SIRT1. The compound 3m also showed a concentration-dependent increase in the acetylation of p53. CONCLUSION Our efforts not only accomplished a one-pot and direct access to 2-(het)aryl substituted benzofurans but also revealed that the benzofuran framework presented here could be a potential template for the identification of potent inhibitors of SIRT1.
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Affiliation(s)
- Bodapati V D Rao
- Department of Chemistry, Krishna University, Machilipatnam-521 001, Andhra Pradesh, India
| | - Suryadevara V Vardhini
- Department of Chemistry, Amritasai Institute of Science and Technology, Paritala, Krishna Dist., 521 180, Andhra Pradesh, India
| | - Deepti Kolli
- Department of Chemistry, Koneru Lakshmaiah Education Foundation, Green fields, Vaddeswaram-522502, Andhra Pradesh, India
| | - Mandava V B Rao
- Department of Chemistry, Krishna University, Machilipatnam-521 001, Andhra Pradesh, India
| | - Manojit Pal
- Dr. Reddy's Institute of Life Sciences, University of Hyderabad Campus, Hyderabad-500046, India
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Li Z, Zhang J, Wang H, Li Z, Zhang X, Di L. Preparation of Pd/C by Atmospheric-Pressure Ethanol Cold Plasma and Its Preparation Mechanism. Nanomaterials (Basel) 2019; 9:nano9101437. [PMID: 31658734 PMCID: PMC6836268 DOI: 10.3390/nano9101437] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 10/01/2019] [Accepted: 10/03/2019] [Indexed: 11/17/2022]
Abstract
Treatment with atmospheric-pressure (AP) hydrogen cold plasma is an effective method for preparing highly active supported metal catalytic materials. However, this technique typically uses H2 as working gas, which is explosive and difficult to transport. This study proposes the use of PdCl2 as a Pd precursor and activated carbon as the support to fabricate Pd/C catalytic materials (Pd/C-EP-Ar) by using ethanol—which is renewable, easily stored, and safe—combined with AP cold plasma (AP ethanol cold plasma) followed by calcination in Ar gas at 550 °C for 2 h. Both Pd/C-EP and Pd/C-HP fabricated using AP ethanol and hydrogen cold plasma (without calcination in Ar gas) respectively, exhibit low CO oxidation reactivity. The activity of Pd/C-EP is lower than Pd/C-HP, which is mainly ascribed to the carbon layer formed by ethanol decomposition during plasma treatment. However, the 100% CO conversion temperature (T100) of Pd/C-EP-Ar is 140 °C, which is similar to that of Pd/C-HP-Ar fabricated using AP hydrogen cold plasma (calcined in Ar gas at 550 °C for 2 h). The characterization results of X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy indicated that the carbon layer formed by ethanol decomposition enhanced the interaction of metal nanoparticles to the support, and a high Pd/C atomic ratio was obtained. This was beneficial to the high CO oxidation performance. This work provides a safe method for synthesizing high-performance Pd/C catalytic materials avoiding the use of H2, which is explosive and difficult to transport.
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Affiliation(s)
- Zhuang Li
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Jingsen Zhang
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Hongyang Wang
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Zhihui Li
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Xiuling Zhang
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
| | - Lanbo Di
- College of Physical Science and Technology, Dalian University, Dalian 116622, China.
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Prasanna GL, Kumar Abbaraju VDN, Bharath Y, Basaveswara Rao MV, Pal M. Ultrasound Assisted Synthesis of 3-(het)aryl Isocoumarin Derivatives and their in vitro Pharmacological Evaluation. Mini Rev Med Chem 2019; 19:842-850. [PMID: 30706808 DOI: 10.2174/1389557519666190130163708] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 06/12/2018] [Revised: 09/22/2018] [Accepted: 01/22/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND In view of numerous biological activities of 3-substituted isocoumarins a number of analogues based on this scaffold were synthesized for their in vitro pharmacological evaluation. METHODS The syntheses of 3-substituted isocoumarins were carried out via a Pd/C-catalyzed Suzuki- Miyaura coupling of 3-chloroisochromen-1-one with a range of boronic acid derivatives. This C-C bond forming reaction was facilitated by ultrasound irradiation to afford the desired products in good yields. A number of 3-(het)aryl isocoumarin derivatives were prepared by using this methodology and subsequently tested for their TNF-α inhibitory properties in vitro followed by cytotoxicities via the MTT assay. RESULTS Several compounds showed inhibition of TNF-α with one compound showing an IC50 value of 9.01±1.25 µM. Three compounds also showed promising cytotoxic properties against two cancer cell lines with IC50 ~ 0.9-2.7 µM. CONCLUSION The isocoumarin framework could be an effective template for the design and discovery of new inhibitor of TNF-α for the potential treatment of related diseases.
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Affiliation(s)
- Gutta Lakshmi Prasanna
- Department of Chemistry, Krishna University, Machilipatnam-521001, Andhra Pradesh, India
| | | | - Yarlagadda Bharath
- Department of Chemistry, Krishna University, Machilipatnam-521001, Andhra Pradesh, India
| | | | - Manojit Pal
- Dr. Reddy's Institute of Life Sciences, University of Hyderabad Campus, Hyderabad 500046, India
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Zhao J, Yuan Y, Meng X, Duan L, Zhou R. Highly Efficient Liquid-Phase Hydrogenation of Naringin Using a Recyclable Pd/C Catalyst. Materials (Basel) 2018; 12:E46. [PMID: 30586873 DOI: 10.3390/ma12010046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 12/18/2018] [Accepted: 12/18/2018] [Indexed: 01/20/2023]
Abstract
A highly efficient liquid-phase hydrogenation reaction using a recyclable palladium on carbon (Pd/C) catalyst has been used for the transformation of naringin to its corresponding dihydrochalcone. The effects of various solvents on the hydrogenation process were studied, with water being identified as the optimal solvent. The analysis also revealed that sodium hydroxide (NaOH) can accumulate on the surface of the Pd/C catalyst in alcoholic solvents, leading to its inactivation. The higher solubility of NaOH in water implies that it remains in solution and does not accumulate on the Pd/C catalyst surface, ensuring the catalytic activity and stability.
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Suman K, Bharath Y, Anuradha V, Rao MVB, Pal M. Ultrasound Assisted One-pot and Sequential Synthesis of 3-methylene-isoindolin-1-ones and their in vitro Evaluation. Mini Rev Med Chem 2018; 18:1498-1505. [PMID: 28758576 DOI: 10.2174/1389557517666170728164620] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 03/18/2017] [Revised: 07/01/2017] [Accepted: 07/05/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND 3-Methyleneisoindolin-1-one derivatives containing a pyridin-2-ylmethyl substituent on their ring nitrogen were designed as potential bioactive agents. A one-pot synthesis of these compounds was achieved via sequential C-C coupling, followed by C-Si bond cleavage and subsequent tandem C-C/C-N bond forming reaction under ultrasound irradiation. METHOD The methodology involved coupling of (trimethylsilyl)acetylene with iodoarenes in the presence of 10% Pd/C-CuI-PPh3-Et3N in MeOH followed by treating the reaction mixture with K2CO3 in aqueous MeOH, and finally coupling with 2-iodo-N-(pyridin-2-ylmethyl)benzamide. The in vitro evaluation of these compounds was performed to identify some initial hit molecules one of which showed dose dependent inhibition of PDE4B.
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Affiliation(s)
- Kancharla Suman
- Chemistry Division, Department Science and Humanities, Vignan's Foundation for Science Technology and Research, University (VFSTR) University, Vadlamudi, Guntur-522 213, Andhra Pradesh, India
| | - Yarlagadda Bharath
- Chemistry Division, Department Science and Humanities, Vignan's Foundation for Science Technology and Research, University (VFSTR) University, Vadlamudi, Guntur-522 213, Andhra Pradesh, India
| | - V Anuradha
- Chemistry Division, Department Science and Humanities, Vignan's Foundation for Science Technology and Research, University (VFSTR) University, Vadlamudi, Guntur-522 213, Andhra Pradesh, India
| | | | - Manojit Pal
- Dr. Reddy's Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, India
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12
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Suman K, Rao KP, Anuradha V, Rao MVB, Pal M. Ultrasound Assisted Synthesis of 3,4-Diyne Substituted Isocoumarin Derivatives: Identification of Potential Cytotoxic Agents. Mini Rev Med Chem 2018; 18:1064-1070. [PMID: 29468966 DOI: 10.2174/1389557518666180117093706] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 05/29/2017] [Revised: 07/01/2017] [Accepted: 01/05/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND The 3,4-diyne substituted isocoumarins have been designed, synthesized and explored as potential anti-proliferative agents. METHOD Ultrasound assisted synthesis of these compounds was carried out by using a three-step method involving (i) Pd/C-Cu catalyzed cross-coupling between the methyl 2-iodobenzoate and buta- 1,3-diynylbenzene followed by (ii) I2-mediated electrophilic cyclization of the resultant 2-(alk-1- ynyl)benzoate ester and (iii) subsequent alkynylation of 4-iodo-3-(phenylethynyl)-isocoumarin under Pd/C-Cu catalysis. CONCLUSION The synthesized compounds showed promising growth inhibition when tested against MDA-MB 231 and K562 cancer cell lines.
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Affiliation(s)
- Kancharla Suman
- Chemistry Division, Department Science and Humanities, Vignan's Foundation for Science Technology and Research, University (VFSTR) University, Vadlamudi, Guntur-522 213, Andhra Pradesh, India
| | - Koya Prabhakara Rao
- Chemistry Division, Department Science and Humanities, Vignan's Foundation for Science Technology and Research, University (VFSTR) University, Vadlamudi, Guntur-522 213, Andhra Pradesh, India
| | - V Anuradha
- Chemistry Division, Department Science and Humanities, Vignan's Foundation for Science Technology and Research, University (VFSTR) University, Vadlamudi, Guntur-522 213, Andhra Pradesh, India
| | | | - Manojit Pal
- Dr. Reddy's Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, India
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13
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Hao Y, Cárdenas-Lizana F, Keane MA. Palladium Promoted Production of Higher Amines from a Lower Amine Feedstock. Catal Letters 2017; 147:803-810. [PMID: 32226263 PMCID: PMC7089641 DOI: 10.1007/s10562-016-1902-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 10/27/2016] [Indexed: 12/04/2022]
Abstract
Abstract The catalytic (Pd/Al2O3 and Pd/C; mean Pd size 2.5–3.0 nm from (S)TEM analysis) synthesis of di-butylamine (DBA) and tri-butylamine (TBA) from mono-butylamine (MBA) and DBA, respectively, in continuous gas phase operation is demonstrated. Exclusive production of DBA (from MBA) has been established over both catalysts where 453 ≤ T ≤ 523 K (∆Ea = 79 kJ mol−1). Greater activity for Pd/C is associated with higher levels of surface acidity (from NH3 chemisorption/TPD) and spillover hydrogen (from H2 TPD). Reaction of DBA over both catalysts when configured in series delivered full selectivity to TBA. Our results establish a novel clean alternative route for the continuous production of higher (secondary and tertiary) amines. Graphical Abstract ![]()
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Affiliation(s)
- Yufen Hao
- Chemical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS Scotland, UK
| | - Fernando Cárdenas-Lizana
- Chemical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS Scotland, UK
| | - Mark A Keane
- Chemical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS Scotland, UK
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14
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Mitoma Y, Katayama Y, Simion AM, Harada H, Kakeda M, Egashira N, Simion C. Considerations on the mechanism of Ca/ethanol/ Pd/C assisted hydrodechlorination of chlorinated aromatic substrates. Chemosphere 2016; 164:92-97. [PMID: 27580262 DOI: 10.1016/j.chemosphere.2016.08.088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 07/28/2016] [Accepted: 08/18/2016] [Indexed: 06/06/2023]
Abstract
In order to elucidate the metal-alcohol hydrodechlorination reaction mechanism, several experiments using chloroanisoles as substrates were performed. Thus, chloroanisoles were stirred at 60 °C for 2 h with a mixture of Ca, methanol and various reduction catalysts. The use of deuterated methanol and zeta potential experiments offered supplementary informations, pointing toward a probable radicalic mechanism that occurs on Ca and Pd/C surfaces.
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Affiliation(s)
- Yoshiharu Mitoma
- Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka-Cho, Shobara City, Hiroshima, 727-0023, Japan.
| | - Yumi Katayama
- Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka-Cho, Shobara City, Hiroshima, 727-0023, Japan
| | - Alina M Simion
- Politehnica University of Bucharest, Department of Organic Chemistry, 060042, Bucharest, Romania
| | - Hiroyuki Harada
- Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka-Cho, Shobara City, Hiroshima, 727-0023, Japan
| | - Mitsunori Kakeda
- Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka-Cho, Shobara City, Hiroshima, 727-0023, Japan
| | - Naoyoshi Egashira
- Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka-Cho, Shobara City, Hiroshima, 727-0023, Japan
| | - Cristian Simion
- Politehnica University of Bucharest, Department of Organic Chemistry, 060042, Bucharest, Romania.
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15
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Tang DTD, Collins KD, Ernst JB, Glorius F. Pd/C as a catalyst for completely regioselective C-H functionalization of thiophenes under mild conditions. Angew Chem Int Ed Engl 2014; 53:1809-13. [PMID: 24505001 DOI: 10.1002/anie.201309305] [Citation(s) in RCA: 146] [Impact Index Per Article: 14.6] [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: 10/24/2013] [Indexed: 01/28/2023]
Abstract
The completely C3-selective arylation of thiophenes and benzo[b]thiophenes was achieved by using Pd/C as a heterogeneous catalyst without ligands or additives under mild reaction conditions. The practicability of this transformation is demonstrated by notable functional group tolerance and the insensitivity of the reaction to H2 O and air. This method is also applicable to nitrogen- and oxygen-containing heterocycles, yielding the corresponding C2-arylated products. Three-phase tests along with Hg-poisoning and hot-filtration tests suggest that the catalytically active species is heterogeneous in nature.
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Affiliation(s)
- Dan-Tam D Tang
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Corrensstrasse 40, 48149 Münster (Germany) http://www.uni-muenster.de/Chemie.oc/glorius/index.html
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16
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Rao RM, Luther BJ, Rani CS, Suresh N, Kapavarapu R, Parsa KVL, Rao MVB, Pal M. Synthesis of 2H-1,3-benzoxazin-4(3H)-one derivatives containing indole moiety: their in vitro evaluation against PDE4B. Bioorg Med Chem Lett 2014; 24:1166-71. [PMID: 24440301 DOI: 10.1016/j.bmcl.2013.12.117] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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: 11/24/2013] [Revised: 12/26/2013] [Accepted: 12/28/2013] [Indexed: 01/17/2023]
Abstract
A number of 2H-1,3-benzoxazin-4(3H)-one derivatives containing indole or benzofuran moieties were synthesized by using Pd/C-Cu mediated coupling-cyclization strategy as a key step. The o-iodoanilides or o-iodophenol were coupled with 3-{2-(prop-2-ynyloxy)ethyl}-2H-benzo[e][1,3]oxazin-4(3H)-one using 10%Pd/C-CuI-PPh3 as a catalyst system and Et3N as a base to give the target compounds. All the synthesized compounds were tested for their PDE4B inhibitory potential in vitro using a cell based cAMP reporter assay. Some of them showed fold increase of the cAMP level when tested at 30 μM. A representative compound showed encouraging PDE4B inhibitory properties that were supported by its docking results.
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Affiliation(s)
- Raja Mohan Rao
- Dr. Reddys Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, India
| | | | | | - Namburi Suresh
- Department of Chemistry, Krishna University, Krishna Dist., Andhra Pradesh, India
| | - Ravikumar Kapavarapu
- Doctoral Programme in Experimental Biology and Biomedicine, Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Kishore V L Parsa
- Dr. Reddys Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, India
| | | | - Manojit Pal
- Dr. Reddys Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, India.
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17
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Eibl C, Munoz L, Tomassoli I, Stokes C, Papke RL, Gündisch D. The 3,7-diazabicyclo[3.3.1]nonane scaffold for subtype selective nicotinic acetylcholine receptor ligands. Part 2: carboxamide derivatives with different spacer motifs. Bioorg Med Chem 2013; 21:7309-29. [PMID: 24145137 DOI: 10.1016/j.bmc.2013.09.060] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [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: 06/23/2013] [Revised: 09/15/2013] [Accepted: 09/24/2013] [Indexed: 11/30/2022]
Abstract
3,7-Diazabicyclo[3.3.1]nonane (bispidine) based nicotinic acetylcholine receptor (nAChR) ligands have been synthesized and evaluated for nAChRs interaction. Diverse spacer motifs were incorporated between the hydrogen bond acceptor (HBA) part and a variety of substituted (hetero)aryl moieties. Bispidine carboxamides bearing spacer motifs often showed high affinity in the low nanomolar range and selectivity for the α4β2(∗) nAChR. Compounds 15, 25, and 47 with Ki values of about 1 nM displayed the highest affinities for α4β2(∗) nAChR. All evaluated compounds are partial agonists or antagonists at α4β2(∗), with reduced or no effects on α3β4(∗) with the exception of compound 15 (agonist), and reduced or no effect at α7 and muscle subtypes.
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Affiliation(s)
- Christoph Eibl
- Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, An der Immenburg 4, D-53121 Bonn, Germany; Department of Pharmaceutical Sciences, The Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 34 Rainbow Drive, Hilo, HI 96720, USA
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18
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Eibl C, Tomassoli I, Munoz L, Stokes C, Papke RL, Gündisch D. The 3,7-diazabicyclo[3.3.1]nonane scaffold for subtype selective nicotinic acetylcholine receptor (nAChR) ligands. Part 1: the influence of different hydrogen bond acceptor systems on alkyl and (hetero)aryl substituents. Bioorg Med Chem 2013; 21:7283-308. [PMID: 24156938 DOI: 10.1016/j.bmc.2013.09.059] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [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: 06/23/2013] [Revised: 09/15/2013] [Accepted: 09/24/2013] [Indexed: 12/21/2022]
Abstract
3,7-Diazabicyclo[3.3.1]nonane is a naturally occurring scaffold interacting with nicotinic acetylcholine receptors (nAChRs). When one nitrogen of the 3,7-diazabicyclo[3.3.1]nonane scaffold was implemented in a carboxamide motif displaying a hydrogen bond acceptor (HBA) functionality, compounds with higher affinities and subtype selectivity for α4β2(∗) were obtained. The nature of the HBA system (carboxamide, sulfonamide, urea) had a strong impact on nAChR interaction. High affinity ligands for α4β2(∗) possessed small alkyl chains, small un-substituted hetero-aryl groups or para-substituted phenyl ring systems along with a carboxamide group. Electrophysiological responses of selected 3,7-diazabicyclo[3.3.1]nonane derivatives to Xenopus oocytes expressing various nAChR subtypes showed diverse activation profiles. Compounds with strongest agonistic profiles were obtained with small alkyl groups whereas a shift to partial agonism/antagonism was observed for aryl substituents.
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Affiliation(s)
- Christoph Eibl
- Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, An der Immenburg 4, D-533121 Bonn, Germany; Department of Pharmaceutical Sciences, The Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 34 Rainbow Drive, Hilo, HI 96720, USA
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19
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Chelopo MP, Pawar SA, Sokhela MK, Govender T, Kruger HG, Maguire GEM. Anticancer activity of ruthenium(II) arene complexes bearing 1,2,3,4-tetrahydroisoquinoline amino alcohol ligands. Eur J Med Chem 2013; 66:407-14. [PMID: 23827181 DOI: 10.1016/j.ejmech.2013.05.048] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [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: 04/12/2013] [Revised: 05/03/2013] [Accepted: 05/30/2013] [Indexed: 10/26/2022]
Abstract
Ruthenium complexes offer potential reduced toxicity compared to current platinum anticancer drugs. 1,2,3,4-tetrahydrisoquinoline amino alcohol ligands were synthesised, characterised and coordinated to an organometallic Ru(II) centre. These complexes were evaluated for activity against the cancer cell lines MCF-7, A549 and MDA-MB-231 as well as for toxicity in the normal cell line MDBK. They were observed to be moderately active against only the MCF-7 cells with the best IC₅₀ value of 34 μM for the cis-diastereomeric complex C4. They also displayed excellent selectivity by being relatively inactive against the normal MDBK cell line with SI values ranging from 2.3 to 7.4.
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Affiliation(s)
- Madichaba P Chelopo
- Catalysis and Peptide Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban 4000, KwaZulu-Natal, South Africa
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20
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Santra A, Ghosh T, Misra AK. Removal of benzylidene acetal and benzyl ether in carbohydrate derivatives using triethylsilane and Pd/C. Beilstein J Org Chem 2013; 9:74-8. [PMID: 23400301 PMCID: PMC3566760 DOI: 10.3762/bjoc.9.9] [Citation(s) in RCA: 33] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Accepted: 12/17/2012] [Indexed: 11/23/2022] Open
Abstract
Clean deprotection of carbohydrate derivatives containing benzylidene acetals and benzyl ethers was achieved under catalytic transfer hydrogenation conditions by using a combination of triethylsilane and 10% Pd/C in CH3OH at room temperature. A variety of carbohydrate diol derivatives were prepared from their benzylidene derivatives in excellent yield.
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Affiliation(s)
- Abhishek Santra
- Bose Institute, Division of Molecular Medicine, P-1/12, C.I.T. Scheme VII-M, Kolkata-700054, India; FAX: 91-33-2355 3886
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21
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Abstract
A convenient protocol for the synthesis of biaryls from arenediazonium salts and potassium aryltrifluoroborates in refluxing methanol catalyzed by Pd/C is described. The protocol is simple to execute and gives moderate to high yields of cross-coupling products in most cases.
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Affiliation(s)
- Lee S Varnedoe
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733
| | - Brad D Angel
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733
| | - Joshua L McClellan
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733
| | - James M Hanna
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733
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