1
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Choi SJ, Kim SH. Bench-stable oxidant sodium percarbonate for functional group transformation of arylboronic acids. Tetrahedron Lett 2023. [DOI: 10.1016/j.tetlet.2023.154378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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2
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Surya Prakash Rao H, Prabakaran M, Muthanna N. Synthesis of 7-hydroxydibenzopyran-6-ones via benzannulation of coumarins. Org Biomol Chem 2022; 20:6905-6914. [PMID: 35975610 DOI: 10.1039/d2ob01203k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have successfully demonstrated a facile synthesis of a variety of 7-hydroxydibenzopyran-6-ones via a two-step protocol from 3-acylcoumarins having a latent Nazarov dienone functionality. Condensation of 3-acylcoumarins and ethyl cyanoacetate under basic (wet K2CO3) and microwave irradiation conditions followed by decarboethoxylative aromatization with Br2 or DDQ furnished dibenzopyran-6-ones in high yields. The formation of ring C of the dibenzopyran-6-one motif critically depended on an active methylene compound and C7 substitution on coumarins. The Ar-Br or ArOTf substitution in dibenzopyran-6-ones was leveraged for the palladium-catalysed Suzuki coupling with diverse aryl boronic acids to increase the structural diversity. Reductive decyanation of C10 cyano dibenzopyran-6-ones furnished some of the isomers of urolithin A.
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Affiliation(s)
- H Surya Prakash Rao
- Department of Chemistry, Pondicherry University, Pondicherry - 605 014, India. .,Vasista Pharma Chem Pvt Limited, Gajularamaram, Hyderabad - 500 090, India
| | - M Prabakaran
- Department of Chemistry, Pondicherry University, Pondicherry - 605 014, India.
| | - Nandurka Muthanna
- Department of Chemistry, Pondicherry University, Pondicherry - 605 014, India.
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3
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Zheng R, Tian J, Binks BP, Cui Z, Xia W, Jiang J. Oil-in-Water emulsions stabilized by alumina nanoparticles with organic electrolytes: Fate of particles. J Colloid Interface Sci 2022; 627:749-760. [PMID: 35878465 DOI: 10.1016/j.jcis.2022.07.085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 07/12/2022] [Accepted: 07/13/2022] [Indexed: 11/17/2022]
Abstract
HYPOTHESIS Oil-in-dispersion emulsions can be stabilized by like charged particles and surfactant. Surfactant adsorbs at the oil-water interface to reduce the interfacial tension and endow the interface with charge, while particles remain dispersed in the aqueous phase to provide electrostatic repulsion between droplets and particles. Can weakly surface-active organic electrolytes adsorb at the oil-water interface and behave like surfactants in stabilizing oil-in-dispersion emulsions with like charged particles? EXPERIMENTS Symmetrical organic electrolytes, tetraalkylammonium bromides (R4NBr), with either no or very low interfacial activity endowing oil droplets with charge were combined with alumina nanoparticles to stabilize emulsions. The effect of R chain length (varying from methyl to butyl) on the type and stability of emulsions was investigated. FINDINGS Mixtures of high concentrations of short chain R4NBr salts (R = methyl or ethyl) and alumina particles stabilise oil-in-water Pickering emulsions, whereas longer chain (R = propyl or butyl) analogues stabilize oil-in-dispersion emulsions assisted by alumina particles. Tetrapropylammonium and tetrabutylammonium cations adsorb at the oil-water interface reducing the interfacial tension and endowing the interface with charge. The stability of the oil-in-dispersion emulsions is dominated by the electrostatic repulsion between the droplets and between droplets and particles in the continuous aqueous phase.
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Affiliation(s)
- Raojun Zheng
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Jingjing Tian
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Bernard P Binks
- Department of Chemistry, University of Hull, Hull HU6 7RX. UK
| | - Zhenggang Cui
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Wenshui Xia
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Jianzhong Jiang
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China.
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4
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Heydari S, Habibi D, Faraji A. A Green and Efficient Solvent- and Catalyst-Free Ultrasonic Dibenzylation Procedure. CHEMISTRY & CHEMICAL TECHNOLOGY 2022. [DOI: 10.23939/chcht16.01.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A greener improvement was achieved for the synthesis of diverse N,N-dibenzylated compounds from the reaction of various aromatic amines with benzyl bromide using the ultrasound irradiation in solvent- and catalyst-free conditions. The dibenzylation reactions were carried out in different solvents and solvent-free conditions under ultrasound irradiation at various temperatures. The yields were very low in all applied solvents, while in the solvent-free condition and at room temperature, the yields were excellent. Due to obtaining the high reaction yields, the catalyst was not used.
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5
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Morais PAB, Francisco CS, de Paula H, Ribeiro R, Eloy MA, Javarini CL, Neto ÁC, Júnior VL. Semisynthetic Triazoles as an Approach in the Discovery of Novel Lead Compounds. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825666210126100227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Historically, medicinal chemistry has been concerned with the approach of organic
chemistry for new drug synthesis. Considering the fruitful collections of new molecular entities,
the dedicated efforts for medicinal chemistry are rewarding. Planning and search for new
and applicable pharmacologic therapies involve the altruistic nature of the scientists. Since
the 19th century, notoriously applying isolated and characterized plant-derived compounds in
modern drug discovery and various stages of clinical development highlight its viability and
significance. Natural products influence a broad range of biological processes, covering transcription,
translation, and post-translational modification, being effective modulators of most
basic cellular processes. The research of new chemical entities through “click chemistry”
continuously opens up a map for the remarkable exploration of chemical space towards leading
natural products optimization by structure-activity relationship. Finally, in this review, we expect to gather a
broad knowledge involving triazolic natural product derivatives, synthetic routes, structures, and their biological activities.
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Affiliation(s)
- Pedro Alves Bezerra Morais
- Centro de Ciencias Exatas, Naturais e da Saude, Universidade Federal do Espirito Santo, 29500000, Alegre, ES, Brazil
| | - Carla Santana Francisco
- Programa de Pos-Graduacao em Quimica, Universidade Federal do Espirito Santo, 29075910, Vitória, ES, Brazil
| | - Heberth de Paula
- Centro de Ciencias Exatas, Naturais e da Saude, Universidade Federal do Espirito Santo, 29500000, Alegre, ES, Brazil
| | - Rayssa Ribeiro
- Programa de Pos- Graduacao em Agroquimica, Universidade Federal do Espirito Santo, 29500000, Alegre, ES, Brazil
| | - Mariana Alves Eloy
- Programa de Pos- Graduacao em Agroquimica, Universidade Federal do Espirito Santo, 29500000, Alegre, ES, Brazil
| | - Clara Lirian Javarini
- Programa de Pos-Graduacao em Quimica, Universidade Federal do Espirito Santo, 29075910, Vitória, ES, Brazil
| | - Álvaro Cunha Neto
- Programa de Pos-Graduacao em Quimica, Universidade Federal do Espirito Santo, 29075910, Vitória, ES, Brazil
| | - Valdemar Lacerda Júnior
- Programa de Pos-Graduacao em Quimica, Universidade Federal do Espirito Santo, 29075910, Vitória, ES, Brazil
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6
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Phenol alkylation under phase transfer catalysis conditions: Insights on the mechanism and kinetics from computations. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111566] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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Kwon G, Joo S, Park S, Kim S. Choline Hydroxide as a Versatile Medium for Catalyst‐Free
O
‐Functionalization of Phenols. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.12138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Gyu‐Tae Kwon
- Department of Chemistry Dankook University, 119 Dandaero Cheonan Korea 31116
| | - Seong‐Ryu Joo
- Department of Chemistry Dankook University, 119 Dandaero Cheonan Korea 31116
| | - Soo‐Youl Park
- Korea Research Institute of Chemical Technology Daejeon Korea 34114
| | - Seung‐Hoi Kim
- Department of Chemistry Dankook University, 119 Dandaero Cheonan Korea 31116
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8
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An alternative route for boron phenoxide preparation from arylboronic acid and its application for C O bond formation. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Zhao Q, Zhao X, Peng H, Liu Y, Yang L, Sun J, Yang L, Shen Y. Static phase transfer catalysis for Williamson reactions: Pickering interfacial catalysis. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00620f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A static PIC system with silica particles was prepared for PTC reactions and exhibited enhanced catalytic activity.
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Affiliation(s)
- Qianqiang Zhao
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Xiao Zhao
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Hui Peng
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Yang Liu
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Lihui Yang
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Jie Sun
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Lei Yang
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Yifeng Shen
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles
- Ministry of Education
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
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10
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Chen QQ, Zhang HX, Yang JX. Pd(OAc)2-catalyzed synthesis of benzyl phenyl ether derivatives with H2O2 as an oxidant in neat water. CATAL COMMUN 2019. [DOI: 10.1016/j.catcom.2018.10.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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11
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Tu G, Yuan C, Li Y, Zhang J, Zhao Y. A Ligand‐Enabled Palladium‐Catalyzed Highly
para
‐Selective Difluoromethylation of Aromatic Ketones. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809788] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Guangliang Tu
- Key Laboratory of Organic Synthesis of Jiangsu ProvinceCollege of ChemistryChemical Engineering and Materials Science, Soochow University Suzhou 215123 P. R. China
| | - Chunchen Yuan
- Key Laboratory of Organic Synthesis of Jiangsu ProvinceCollege of ChemistryChemical Engineering and Materials Science, Soochow University Suzhou 215123 P. R. China
| | - Yuting Li
- Key Laboratory of Organic Synthesis of Jiangsu ProvinceCollege of ChemistryChemical Engineering and Materials Science, Soochow University Suzhou 215123 P. R. China
| | - Jingyu Zhang
- Key Laboratory of Organic Synthesis of Jiangsu ProvinceCollege of ChemistryChemical Engineering and Materials Science, Soochow University Suzhou 215123 P. R. China
| | - Yingsheng Zhao
- Key Laboratory of Organic Synthesis of Jiangsu ProvinceCollege of ChemistryChemical Engineering and Materials Science, Soochow University Suzhou 215123 P. R. China
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12
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Tu G, Yuan C, Li Y, Zhang J, Zhao Y. A Ligand-Enabled Palladium-Catalyzed Highly para-Selective Difluoromethylation of Aromatic Ketones. Angew Chem Int Ed Engl 2018; 57:15597-15601. [PMID: 30299562 DOI: 10.1002/anie.201809788] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 09/29/2018] [Indexed: 11/08/2022]
Abstract
A practical and highly para-selective C-H difluoromethylation of aromatic ketones has been developed by employing tetrakis(triphenylphosphine)palladium(0) as the catalyst and triphenylphosphine as the ligand. In addition to general aromatic ketones, this transformation was compatible with bioactive compounds and well-known drugs, such as oxybenzone, ketoprofen, zaltoprofen, and propafenone. Moreover, a mechanistic study revealed that a palladium intermediate coordinated by a carbonyl group promotes highly para-selective difluoromethylation.
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Affiliation(s)
- Guangliang Tu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Chunchen Yuan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Yuting Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Jingyu Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Yingsheng Zhao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
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13
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Todorov AR, Wirtanen T, Helaja J. Photoreductive Removal of O-Benzyl Groups from Oxyarene N-Heterocycles Assisted by O-Pyridine-pyridone Tautomerism. J Org Chem 2017; 82:13756-13767. [PMID: 29135249 DOI: 10.1021/acs.joc.7b02775] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Facile photoreductive protocols have been developed to remove benzyl O-protective groups from oxyarene N-heterocycles at positions capable for 2-/4-O-pyridine-2-/4-pyridone tautomerism. Blue light irradiation, a [Ru] or [Ir] photocatalyst, and ascorbic acid in a water-acetonitrile solution debenzylates a variety of aryl N-heterocycles cleanly and selectively. Ascorbic acid has two functions in the reaction. On the one hand, it protonates the N-heterocycles that reduces their reduction potentials notably and on the other hand it acts as a sacrificial reductant. Reduction potentials and free energy barriers calculated at the CPCM-B3LYP/6-31+G** level can predict the reactivities of the studied substrates.
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Affiliation(s)
- Aleksandar R Todorov
- Department of Chemistry, University of Helsinki , A.I. Virtasen aukio 1, 00014 Helsinki, Finland
| | - Tom Wirtanen
- Department of Chemistry, University of Helsinki , A.I. Virtasen aukio 1, 00014 Helsinki, Finland
| | - Juho Helaja
- Department of Chemistry, University of Helsinki , A.I. Virtasen aukio 1, 00014 Helsinki, Finland
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14
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Hammerich M, Schütt C, Stähler C, Lentes P, Röhricht F, Höppner R, Herges R. Heterodiazocines: Synthesis and Photochromic Properties, Trans to Cis Switching within the Bio-optical Window. J Am Chem Soc 2016; 138:13111-13114. [PMID: 27685503 DOI: 10.1021/jacs.6b05846] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Diazocines, bridged azobenzenes, exhibit superior photophysical properties compared to parent azobenzenes such as high switching efficiencies, quantum yields, and particularly switching wavelengths in the visible range. Synthesis, however, proceeds with low yields, and derivatives are difficult to prepare. We now present two heterodiazocines which are easier to synthesize, and the general procedures should also provide facile access to derivatives. Moreover, both compounds can be switched with light in the far-red (650 nm). Accessibility and photophysical properties make them ideal candidates for applications such as photoswitchable drugs and functional materials.
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Affiliation(s)
- Melanie Hammerich
- Otto Diels-Institute of Organic Chemistry, Christian Albrechts University Kiel , Otto Hahn Platz 4, 24118 Kiel, Germany
| | - Christian Schütt
- Otto Diels-Institute of Organic Chemistry, Christian Albrechts University Kiel , Otto Hahn Platz 4, 24118 Kiel, Germany
| | - Cosima Stähler
- Otto Diels-Institute of Organic Chemistry, Christian Albrechts University Kiel , Otto Hahn Platz 4, 24118 Kiel, Germany
| | - Pascal Lentes
- Otto Diels-Institute of Organic Chemistry, Christian Albrechts University Kiel , Otto Hahn Platz 4, 24118 Kiel, Germany
| | - Fynn Röhricht
- Otto Diels-Institute of Organic Chemistry, Christian Albrechts University Kiel , Otto Hahn Platz 4, 24118 Kiel, Germany
| | - Ronja Höppner
- Institute for Physical Chemistry, Christian Albrechts University Kiel , Max-Eyth-Str. 2, 24118 Kiel, Germany
| | - Rainer Herges
- Otto Diels-Institute of Organic Chemistry, Christian Albrechts University Kiel , Otto Hahn Platz 4, 24118 Kiel, Germany
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15
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Chaudhary V, Venghateri JB, Dhaked HPS, Bhoyar AS, Guchhait SK, Panda D. Novel Combretastatin-2-aminoimidazole Analogues as Potent Tubulin Assembly Inhibitors: Exploration of Unique Pharmacophoric Impact of Bridging Skeleton and Aryl Moiety. J Med Chem 2016; 59:3439-51. [DOI: 10.1021/acs.jmedchem.6b00101] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Vikas Chaudhary
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Jubina B. Venghateri
- IITB-Monash Research
Academy, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Hemendra P. S. Dhaked
- Department of Biosciences
and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Anil S. Bhoyar
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Sankar K. Guchhait
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Dulal Panda
- Department of Biosciences
and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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16
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Kreye O, Over LC, Nitsche T, Lange RZ, Meier MA. Organic carbonates: sustainable and environmentally-friendly ethylation, allylation, and benzylation reagents. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.11.053] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Singh AS, Shendage SS, Nagarkar JM. Choline chloride based deep eutectic solvent as an efficient solvent for the benzylation of phenols. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.11.053] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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