1
|
Song W, Ma M, Zhang W, Feng R, Lu C, Zhang HY, Zhang Y, Zhao J. Visible-light-induced C(sp 3)-H bromination of 4-methylthiophene derivatives with HBr/H 2O 2. Org Biomol Chem 2024; 22:4145-4152. [PMID: 38713051 DOI: 10.1039/d4ob00547c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
A convenient method to synthesize ethyl 4-(bromomethyl)thiophene-3-carboxylate derivatives has been developed via a visible-light-induced radical process in good yields and with wide functional group tolerance under air conditions and at ambient temperature. The present protocol has the advantages of a high atom economy, easy purification, and environmental friendliness as it employs HBr as the bromine source and the cheap and low-toxic H2O2 as the oxidant. The synthetic utility of this method is demonstrated by a gram scale reaction and its application in the innovative synthesis of the clinical drug relugolix.
Collapse
Affiliation(s)
- Wenbo Song
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin 300131, China
| | - Ming Ma
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin 300131, China
| | - Wenjing Zhang
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin 300131, China
| | - Ranran Feng
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin 300131, China
| | - Congcong Lu
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin 300131, China
| | - Hong-Yu Zhang
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin 300131, China
| | - Yuecheng Zhang
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China
| | - Jiquan Zhao
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300131, China.
- Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin 300131, China
| |
Collapse
|
2
|
Roncaglia F, Ughetti A, Porcelli N, Anderlini B, Severini A, Rigamonti L. Light on the sustainable preparation of aryl-cored dibromides. Beilstein J Org Chem 2024; 20:1076-1087. [PMID: 38774275 PMCID: PMC11106674 DOI: 10.3762/bjoc.20.95] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 05/02/2024] [Indexed: 05/24/2024] Open
Abstract
Both aryl and benzyl polybromides have gained significant importance as reactive building blocks in polymer and materials chemistry. Their preparation primarily relies on established synthetic methods using molecular bromine or N-bromosuccinimide, known for their reliability and effectiveness. However, from a sustainability perspective, these methods suffer from the generation of stoichiometric amounts of byproducts and often encounter selectivity troubles. To mitigate these issues, we extended the greener peroxide-bromide halogenation method, initially developed for monobromides, to afford aryl-cored polybromides in high yields. The same method can be employed in two variants modulated by light irradiation. This external switch can be used to selectively trigger side-chain or core halogenation.
Collapse
Affiliation(s)
- Fabrizio Roncaglia
- University of Modena and Reggio Emilia, Department of Chemical and Geological Sciences, Via Campi 103, 41125 Modena, Italy
| | - Alberto Ughetti
- University of Modena and Reggio Emilia, Department of Chemical and Geological Sciences, Via Campi 103, 41125 Modena, Italy
| | - Nicola Porcelli
- University of Modena and Reggio Emilia, Department of Chemical and Geological Sciences, Via Campi 103, 41125 Modena, Italy
| | - Biagio Anderlini
- University of Modena and Reggio Emilia, Department of Chemical and Geological Sciences, Via Campi 103, 41125 Modena, Italy
| | - Andrea Severini
- University of Modena and Reggio Emilia, Department of Chemical and Geological Sciences, Via Campi 103, 41125 Modena, Italy
| | - Luca Rigamonti
- University of Modena and Reggio Emilia, Department of Chemical and Geological Sciences, Via Campi 103, 41125 Modena, Italy
| |
Collapse
|
3
|
Festa AA, Storozhenko OA, Voskressensky LG, Van der Eycken EV. Visible light-mediated halogenation of organic compounds. Chem Soc Rev 2023. [PMID: 37975853 DOI: 10.1039/d3cs00366c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
The use of visible light and photoredox catalysis emerged as a powerful and sustainable tool for organic synthesis, showing high value for distinctly different ways of bond creation. Halogenated compounds are the cornerstone of contemporary organic synthesis: it is almost impossible to develop a route towards a pharmaceutical reagent, agrochemical, natural product, etc. without the involvement of halogen-containing intermediates. Moreover, the halogenated derivatives as final products became indispensable for drug discovery and materials science. The idea of this review is to understand and summarise the impact of visible light-promoted chemistry on halogenation and halofunctionalisation reactions.
Collapse
Affiliation(s)
- Alexey A Festa
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
| | - Olga A Storozhenko
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
| | - Leonid G Voskressensky
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
| | - Erik V Van der Eycken
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, University of Leuven (KU Leuven), Celestijnenlaan 200F, B-3001, Leuven, Belgium
| |
Collapse
|
4
|
Abazari R, Sanati S, Li N, Qian J. Fluorinated Metal-Organic Frameworks with Dual-Functionalized Linkers to Enhance Photocatalytic H 2 Evolution and High Water Adsorption. Inorg Chem 2023; 62:18680-18688. [PMID: 37907390 DOI: 10.1021/acs.inorgchem.3c03052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Photocatalytic H2 evolution has recently attracted much attention due to the reduction of nonrenewable energy sources and the increasing demand for renewable sustainable energies. Meanwhile, metal-organic frameworks (MOFs) are emerging potential photocatalysts due to their structural adaptability, porous configuration, several active sites, and a wide range of performance. Nevertheless, there are still limitations in the photocatalytic H2 evolution reaction of MOFs with higher charge recombination rates. Herein, a copper-organic framework with dual-functionalized linkers {[Cu2(L)(H2O)2]·(5DMF)(4H2O)}n (fluorinated MOF(Cu)-NH2; H4L = 3,5-bis(2,4-dicarboxylic acid)-4-(trifluoromethyl)aniline) and with a rare 2-nodal 4,12-connected shp topology has been synthesized by a ligand-functionalization strategy and evaluated for the photocatalytic production of H2 to overcome this issue. According to the photocatalytic H2 evolution results, fluorinated MOF(Cu)-NH2 showed a hydrogen evolution rate of 63.64 mmol·g-1·h-1 exposed to light irradiation, indicating values 12 times that of the pure ligand when cocatalyst Pt and photosensitizer Rhodamine B were present. In addition, this MOF showed a maximum water absorption of 205 cm3·g-1. When dual-functionalized linkers are introduced to the structure of this MOF, its visible-light absorption increases considerably, which can be associated with nearly narrower energy band gaps (2.18 eV). More importantly, this MOF contributes to water absorption and electron collection and transport, acting as a bridge that helps to separate and transfer photogenerated charges while shortening the electron migration path because of the functional group in its configuration. The current paper seeks to shed light on the design of advanced visible-light photocatalysts with no MOF calcination for H2 photocatalytic production.
Collapse
Affiliation(s)
- Reza Abazari
- Department of Chemistry, Faculty of Science, University of Maragheh, P.O. Box 55181-83111, Maragheh 83111-55181, Iran
| | - Soheila Sanati
- Department of Chemistry, Faculty of Science, University of Maragheh, P.O. Box 55181-83111, Maragheh 83111-55181, Iran
| | - Nan Li
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang325035, PR China
| | - Jinjie Qian
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang325035, PR China
| |
Collapse
|
5
|
Wang J, Abazari R, Sanati S, Ejsmont A, Goscianska J, Zhou Y, Dubal DP. Water-Stable Fluorous Metal-Organic Frameworks with Open Metal Sites and Amine Groups for Efficient Urea Electrocatalytic Oxidation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2300673. [PMID: 37376842 DOI: 10.1002/smll.202300673] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 06/15/2023] [Indexed: 06/29/2023]
Abstract
Urea oxidation reaction (UOR) is one of the promising alternative anodic reactions to water oxidation that has attracted extensive attention in green hydrogen production. The application of specifically designed electrocatalysts capable of declining energy consumption and environmental consequences is one of the major challenges in this field. Therefore, the goal is to achieve a resistant, low-cost, and environmentally friendly electrocatalyst. Herein, a water-stable fluorinated Cu(II) metalorganic framework (MOF) {[Cu2 (L)(H2 O)2 ]·(5DMF)(4H2 O)}n (Cu-FMOF-NH2 ; H4 L = 3,5-bis(2,4-dicarboxylic acid)-4-(trifluoromethyl)aniline) is developed utilizing an angular tetracarboxylic acid ligand that incorporates both trifluoromethyl (-CF3 ) and amine (-NH2 ) groups. The tailored structure of Cu-FMOF-NH2 where linkers are connected by fluoride bridges and surrounded by dicopper nodes reveals a 4,24T1 topology. When employed as electrocatalyst, Cu-FMOF-NH2 requires only 1.31 V versus reversible hydrogen electrode (RHE) to deliver 10 mA cm-2 current density in 1.0 m KOH with 0.33 m urea electrolyte and delivered an even higher current density (50 mA cm-2 ) at 1.47 V versus RHE. This performance is superior to several reported catalysts including commercial RuO2 catalyst with overpotential of 1.52 V versus RHE. This investigation opens new opportunities to develop and utilize pristine MOFs as a potential electrocatalyst for various catalytic reactions.
Collapse
Affiliation(s)
- Jinhu Wang
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan, Zhejiang, 316004, China
| | - Reza Abazari
- Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, 55181-83111, Iran
| | - Soheila Sanati
- Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, 55181-83111, Iran
| | - Aleksander Ejsmont
- Adam Mickiewicz University in Poznań, Faculty of Chemistry, Department of Chemical Technology, Uniwersytetu Poznańskiego 8, Poznań, 61-614, Poland
| | - Joanna Goscianska
- Adam Mickiewicz University in Poznań, Faculty of Chemistry, Department of Chemical Technology, Uniwersytetu Poznańskiego 8, Poznań, 61-614, Poland
| | - Yingtang Zhou
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan, Zhejiang, 316004, China
| | - Deepak P Dubal
- Centre for Materials Science, School of Chemistry & Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia
| |
Collapse
|
6
|
Panda J, Sahoo J, Dutta J, Biswal HS, Sahoo G. Spectroscopic and Computational Study of the Organocatalytic Umpolung of Bromocations: An Accelerated Stereoselective Dibromination Protocol. Chemistry 2023; 29:e202300675. [PMID: 37276362 DOI: 10.1002/chem.202300675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 05/30/2023] [Accepted: 06/02/2023] [Indexed: 06/07/2023]
Abstract
Herein, organocatalytically achieved polarity reversal of cationic bromine is presented. The proven bromocation source N-bromosuccinimide (NBS) was converted to a superior bromoanion reagent by H/Br exchange with a secondary amine, substantiated with spectroscopic and computational evidence. The concept has further been used in a successfully accelerated organocatalyzed dibromination of olefins in a non-hazardous, commercially viable process with a wide range of substrate scope. The reactivity of key entities observed through NMR kinetics and reaction acceleration using only 10 mol % of catalyst account for its major success. The nucleophilicity of the bromoanion was found to be superior in comparison to other nucleophiles such as MeOH and H2 O also the protocol dominates over the competing allylic bromination reaction.
Collapse
Affiliation(s)
- Jeetendra Panda
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Odisha, 769008, India
| | - Jigyansa Sahoo
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Odisha, 769008, India
| | - Juhi Dutta
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, Odisha, 752050, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, Maharashtra, 400094, India
| | - Himansu Sekhar Biswal
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, Odisha, 752050, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, Maharashtra, 400094, India
| | - Gokarneswar Sahoo
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Odisha, 769008, India
| |
Collapse
|
7
|
Yekkezare H, Tajik H, Mahmoodi NM. Green halogenation of aromatic compounds using environmentally friendly synthesized rod-like metal-organic framework (MIL-88A) catalyst. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
|
8
|
Synthetic Access to Aromatic α-Haloketones. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27113583. [PMID: 35684526 PMCID: PMC9182500 DOI: 10.3390/molecules27113583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/19/2022] [Accepted: 05/20/2022] [Indexed: 11/24/2022]
Abstract
α-Haloketones play an essential role in the synthesis of complex N-, S-, O-heterocycles; of which some exhibit a remarkable biological activity. Research further illustrated that α-bromo-, α-chloro-, and α-iodoketones are key precursors for blockbuster pharmacological compounds. Over the past twenty years, substantial advances have been made in the synthesis of these industrially relevant building blocks. Efforts have focused on rendering the synthetic protocols greener, more effective and versatile. In this survey, we summarised and thoroughly evaluated the progress of the field, established in the past two decades, in terms of generality, efficacy and sustainability.
Collapse
|
9
|
Chowdhury S, Pandey S, Gupta A, Kumar A. Metal-free electrochemical regioselective aromatic C–H bromination of N,N-disubstituted anilines using propargyl bromide as the unprecedented bromine source. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
10
|
Van Kerrebroeck R, Horsten T, Stevens CV. BROMIDE OXIDATION: A SAFE STRATEGY FOR ELECTROPHILIC BROMINATIONS. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200310] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Tomas Horsten
- Ghent University: Universiteit Gent Green Chemistry and Technology BELGIUM
| | | |
Collapse
|
11
|
Liu L, Liu P, Zhang D, Zhang HY, Zhang Y, Zhao J. Photocatalytic Oxidative Bromination of 2,6-Dichlorotoluene to 2,6-Dichlorobenzyl Bromide in a Microchannel Reactor. ACS OMEGA 2022; 7:4624-4629. [PMID: 35155953 PMCID: PMC8829936 DOI: 10.1021/acsomega.1c06737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 01/18/2022] [Indexed: 06/14/2023]
Abstract
Photocatalytic oxidative benzylic bromination with hydrobromic acid (HBr) and hydrogen peroxide (H2O2) is a green process for the synthesis of benzyl bromides, but suffers from the risk of explosion when performing it in a batch reactor. This disadvantage could be overcome by running the reaction in a microchannel reactor. In this work, a green and safe process for the synthesis of 2,6-dichlorobenzyl bromide (DCBB) was developed by conducting selective benzylic bromination of 2,6-dichlorotoluene (DCT) with H2O2 as an oxidant and HBr as a bromine source in a microchannel reactor under light irradiation. The reaction parameters were optimized, and the conversion of DCT reached up to 98.1% with a DCBB yield of 91.4% under the optimal reaction conditions.
Collapse
Affiliation(s)
- Lin Liu
- School
of Chemical Engineering, Hebei University
of Technology, Tianjin 300401, P.R. China
| | - Peng Liu
- School
of Chemical Engineering, Hebei University
of Technology, Tianjin 300401, P.R. China
| | - Di Zhang
- Tasly
Pharmaceutical Group Co. Ltd., Tianjin 300402, P.R. China
| | - Hong-Yu Zhang
- School
of Chemical Engineering, Hebei University
of Technology, Tianjin 300401, P.R. China
| | - Yuecheng Zhang
- Hebei
Provincial Key Lab of Green Chemical Technology and High Efficient
Energy Saving, School of Chemical Engineering, Hebei University of Technology, Tianjin 300401, P.R. China
| | - Jiquan Zhao
- School
of Chemical Engineering, Hebei University
of Technology, Tianjin 300401, P.R. China
| |
Collapse
|
12
|
Panda J, Raiguru BP, Mishra M, Mohapatra S, Nayak S. Recent Advances in the Synthesis of Imidazo[1,2‐
a
]pyridines: A Brief Review. ChemistrySelect 2022. [DOI: 10.1002/slct.202103987] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jasmine Panda
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Bishnu P. Raiguru
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Mitali Mishra
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Seetaram Mohapatra
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Sabita Nayak
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| |
Collapse
|
13
|
Cai C, Zou D. Recent Progress in Benzylic C(sp 3)—H Functionalization of Toluene and Its Derivatives. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202201027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
14
|
Li JQ, Chen XH, Wang XX, Cui HL. Bromination of phenyl ether and other aromatics with bromoisobutyrate and dimethyl sulfoxide. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153375] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
15
|
Yadav RK, Sharma R, Gautam D, Joshi J, Chaudhary S. Lewis Acid/Oxidant as Rapid Regioselective Halogenating Reagent System for Direct Halogenation of Fused Bi‐/Tri‐cyclic Hetero‐Aromatic Congeners
via
−H bond Functionalization. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ravi Kant Yadav
- Laboratory of Organic and Medicinal Chemistry (OMC lab) Department of Chemistry Malaviya National Institute of Technology Jaipur Jawaharlal Nehru Marg Jaipur 302017 India
- Department of Chemistry Malaviya National Institute of Technology Jaipur Jawaharlal Nehru Marg Jaipur 302017 India
| | - Richa Sharma
- Laboratory of Organic and Medicinal Chemistry (OMC lab) Department of Chemistry Malaviya National Institute of Technology Jaipur Jawaharlal Nehru Marg Jaipur 302017 India
| | - Deepak Gautam
- Laboratory of Organic and Medicinal Chemistry (OMC lab) Department of Chemistry Malaviya National Institute of Technology Jaipur Jawaharlal Nehru Marg Jaipur 302017 India
| | - Jyoti Joshi
- Department of Chemistry Malaviya National Institute of Technology Jaipur Jawaharlal Nehru Marg Jaipur 302017 India
| | - Sandeep Chaudhary
- Laboratory of Organic and Medicinal Chemistry (OMC lab) Department of Chemistry Malaviya National Institute of Technology Jaipur Jawaharlal Nehru Marg Jaipur 302017 India
| |
Collapse
|
16
|
Reactivity of substrates with multiple competitive reactive sites toward NBS under neat reaction conditions promoted by visible light. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-021-01711-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
AbstractRegioselectivity of visible-light-induced transformations of a range of (hetero)aryl alkyl-substituted ketones bearing several competitive reactive sites (α-carbonyl, benzyl and aromatic ring) with N-bromosuccinimide (NBS) was studied under solvent-free reaction conditions (SFRC) and in the absence of inert-gas atmosphere, radical initiators and catalysts. An 8-W energy-saving household lamp was used for irradiation. Heterogeneous reaction conditions were dealt with throughout the study. All substrates were mono- or dibrominated at the α-carbonyl position, and additionally, some benzylic or aromatic bromination was observed in substrates with benzylic carbon atoms or electron-donating methoxy groups, respectively. Surprisingly, ipso-substitution of the acyl group with a bromine atom took place with (4-methoxynaphthyl) alkyl ketones. While the addition of the radical scavenger TEMPO (2,2,6,6-tetramethylpiperidin-1-yloxy) decreased the extent of α- and ring bromination, it completely suppressed the benzylic bromination and α,α-dibromination with NBS under SFRC.
Collapse
|
17
|
Bityukov OV, Vil' VA, Nikishin GI, Terent'ev AO. Alkene, Bromide, and ROH – How To Achieve Selectivity? Electrochemical Synthesis of Bromohydrins and Their Ethers. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100161] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Oleg V. Bityukov
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences, 47 Leninsky prosp. 119991 Moscow Russian Federation
- All-Russian Research Institute for Phytopathology B. Vyazyomy Moscow Region 143050 Russian Federation
| | - Vera A. Vil'
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences, 47 Leninsky prosp. 119991 Moscow Russian Federation
- All-Russian Research Institute for Phytopathology B. Vyazyomy Moscow Region 143050 Russian Federation
| | - Gennady I. Nikishin
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences, 47 Leninsky prosp. 119991 Moscow Russian Federation
| | - Alexander O. Terent'ev
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences, 47 Leninsky prosp. 119991 Moscow Russian Federation
- All-Russian Research Institute for Phytopathology B. Vyazyomy Moscow Region 143050 Russian Federation
| |
Collapse
|
18
|
|
19
|
Richards K, Petit E, Legrand YM, Grison C. Eco-Friendly Methodology for the Formation of Aromatic Carbon-Heteroatom Bonds by Using Green Ionic Liquids. Chemistry 2021; 27:809-814. [PMID: 33037687 DOI: 10.1002/chem.202003827] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/23/2020] [Indexed: 11/08/2022]
Abstract
A new sustainable method is reported for the formation of aromatic carbon-heteroatom bonds under solvent-free and mild conditions (no co-oxidant, no strong acid and no toxic reagents) by using a new type of green ionic liquid. The bromination of methoxy arenes was chosen as a model reaction. The reaction methodology is based on only using natural sodium bromine, which is transformed into an electrophilic brominating reagent within an ionic liquid, easily prepared from the melted salt FeCl3 hexahydrate. Bromination reactions with this in-situ-generated reagent gave good yields and excellent regioselectivity under simple and environmentally friendly conditions. To understand the unusual bromine polarity reversal of sodium bromine without any strong oxidant, the molecular structure of the reaction medium was characterised by Raman and direct infusion electrospray ionisation mass spectroscopy (ESI-MS). An extensive computational investigation using density functional theory methods was performed to describe a mechanism that suggests indirect oxidation of Br- through new iron adducts. The versatility of the methodology was successively applied to nitration and thiocyanation of methoxy arenes using KNO3 and KSCN in melted hexahydrated FeCl3 .
Collapse
Affiliation(s)
- Kenza Richards
- Laboratoire de Chimie Bio-Inspirée et d'Innovations Ecologiques, ChimEco UMR 5021, CNRS-, Université de Montpellier, Cap Delta, 1682 Rue de la Valsière, 34790, Grabels, France
| | - Eddy Petit
- Institut Européen des Membranes, IEM UMR 5635 CNRS-Université de Montpellier, 300 Av. Prof. E. Jeanbrau, 34095, Montpellier, France
| | - Yves-Marie Legrand
- Laboratoire de Chimie Bio-Inspirée et d'Innovations Ecologiques, ChimEco UMR 5021, CNRS-, Université de Montpellier, Cap Delta, 1682 Rue de la Valsière, 34790, Grabels, France
| | - Claude Grison
- Laboratoire de Chimie Bio-Inspirée et d'Innovations Ecologiques, ChimEco UMR 5021, CNRS-, Université de Montpellier, Cap Delta, 1682 Rue de la Valsière, 34790, Grabels, France
| |
Collapse
|
20
|
Fan J, Wei Q, Zhu E, Gao J, Cheng X, Lu Y, Loh TP. Visible light-induced mono-bromination of arenes with BrCCl 3. Chem Commun (Camb) 2021; 57:5977-5980. [PMID: 34027541 DOI: 10.1039/d1cc01721g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly efficient and regioselective bromination of electron-rich arenes and heteroarenes using commercially available BrCCl3 as a "Br" source has been developed. The reaction was performed in air under mild conditions with photocatalyst Ru(bpy)3Cl2·6H2O, avoiding the usage of strong acids and strong oxidants. Mono-brominated products were obtained with medium to excellent yields (up to 94%). This strategy has shown good compatibility and high para-selectivity, which will facilitate the complicated synthesis.
Collapse
Affiliation(s)
- Jiali Fan
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (Nanjing Tech), Nanjing 211816, P. R. China.
| | - Qiancheng Wei
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (Nanjing Tech), Nanjing 211816, P. R. China.
| | - Ershu Zhu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (Nanjing Tech), Nanjing 211816, P. R. China.
| | - Jing Gao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (Nanjing Tech), Nanjing 211816, P. R. China.
| | - Xiamin Cheng
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (Nanjing Tech), Nanjing 211816, P. R. China.
| | - Yongna Lu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (Nanjing Tech), Nanjing 211816, P. R. China.
| | - Teck-Peng Loh
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University (Nanjing Tech), Nanjing 211816, P. R. China. and Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| |
Collapse
|
21
|
Mohite AR, Phatake RS, Dubey P, Agbaria M, Shames AI, Lemcoff NG, Reany O. Thiourea-Mediated Halogenation of Alcohols. J Org Chem 2020; 85:12901-12911. [DOI: 10.1021/acs.joc.0c01431] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Amar R. Mohite
- Department of Natural Sciences, The Open University of Israel, Ra’anana 4353701, Israel
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Ravindra S. Phatake
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Pooja Dubey
- Department of Natural Sciences, The Open University of Israel, Ra’anana 4353701, Israel
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Mohamed Agbaria
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Alexander I. Shames
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - N. Gabriel Lemcoff
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
- Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Ofer Reany
- Department of Natural Sciences, The Open University of Israel, Ra’anana 4353701, Israel
| |
Collapse
|
22
|
Kancherla S, Jørgensen KB. Synthesis of Phenacene-Helicene Hybrids by Directed Remote Metalation. J Org Chem 2020; 85:11140-11153. [PMID: 32786610 PMCID: PMC7498163 DOI: 10.1021/acs.joc.0c01097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) with six and seven rings were synthesized via directed metalation and cross-coupling of chrysenyl N,N-diethyl carboxamides with o-tolyl and methylnaphthalenyl derivatives. In the presence of competing ortho sites, the site selectivity in iodination of chrysenyl amides by directed ortho metalation (DoM) was influenced by the lithium base. The catalyst ligand bite angle was presumably important in the cross-coupling of sterically hindered bulky PAHs. Subsequent directed remote metalation of biaryls under standard conditions and at elevated temperatures afforded various fused six- and seven-ring PAHs, all in good yields and with fluorescent properties.
Collapse
Affiliation(s)
- Sindhu Kancherla
- Department of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, N-4036 Stavanger, Norway
| | - Kåre B Jørgensen
- Department of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, N-4036 Stavanger, Norway
| |
Collapse
|
23
|
Suzuki T, Koyama T, Nakanishi K, Kobayashi S, Tanino K. Formal Total Synthesis of Atropurpuran. J Org Chem 2020; 85:10125-10135. [DOI: 10.1021/acs.joc.0c01462] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Takahiro Suzuki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810 Hokkaido, Japan
| | - Takeshi Koyama
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-0810 Hokkaido, Japan
| | - Kenta Nakanishi
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-0810 Hokkaido, Japan
| | - Susumu Kobayashi
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Keiji Tanino
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810 Hokkaido, Japan
| |
Collapse
|
24
|
Syiemlieh I, Asthana M, Kurbah SD, Lal RA. Synthesis, crystal structure and reactivity of homobimetallic vanadium(V) complexes derived from oxaloyldihydrazone ligands. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.05.047] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
25
|
Cheng X, Shan J, Tian X, Ren YL, Zhu Y. Benzylation of Arenes with Benzyl Halides under Promoter-Free and Additive-Free Conditions. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900590] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Xinqiang Cheng
- School of Chemical Engineering & Pharmaceutics; Henan University of Science and Technology; Luoyang 471003 Henan P. R. China
| | - Jiankai Shan
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou 450001 Henan Province P.R. China
| | - Xinshe Tian
- School of Chemical Engineering & Pharmaceutics; Henan University of Science and Technology; Luoyang 471003 Henan P. R. China
| | - Yun-Lai Ren
- School of Chemical Engineering & Pharmaceutics; Henan University of Science and Technology; Luoyang 471003 Henan P. R. China
| | - Yanyan Zhu
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou 450001 Henan Province P.R. China
| |
Collapse
|
26
|
Van Kerrebroeck R, Naert P, Heugebaert TSA, D'hooghe M, Stevens CV. Electrophilic Bromination in Flow: A Safe and Sustainable Alternative to the Use of Molecular Bromine in Batch. Molecules 2019; 24:E2116. [PMID: 31167456 PMCID: PMC6600453 DOI: 10.3390/molecules24112116] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 05/30/2019] [Accepted: 06/01/2019] [Indexed: 11/26/2022] Open
Abstract
Bromination reactions are crucial in today's chemical industry since the versatility of the formed organobromides makes them suitable building blocks for numerous syntheses. However, the use of the toxic and highly reactive molecular bromine (Br2) makes these brominations very challenging and hazardous. We describe here a safe and straightforward protocol for bromination in continuous flow. The hazardous Br2 or KOBr is generated in situ by reacting an oxidant (NaOCl) with HBr or KBr, respectively, which is directly coupled to the bromination reaction and a quench of residual bromine. This protocol was demonstrated by polybrominating both alkenes and aromatic substrates in a wide variety of solvents, with yields ranging from 78% to 99%. The protocol can easily be adapted for the bromination of other substrates in an academic and industrial environment.
Collapse
Affiliation(s)
- Reinout Van Kerrebroeck
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Pieter Naert
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Thomas S A Heugebaert
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Matthias D'hooghe
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Christian V Stevens
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| |
Collapse
|
27
|
Shi C, Miao Q, Ma L, Lu T, Yang D, Chen J, Li Z. Room‐Temperature C‐H Bromination and Iodination with Sodium Bromide and Sodium Iodide Using
N
‐Fluorobenzenesulfonimide as an Oxidant. ChemistrySelect 2019. [DOI: 10.1002/slct.201901456] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Cuiying Shi
- Department of Pharmaceutical and Biological EngineeringSchool of Chemical Engineering, Sichuan University No.24 South Section 1, Yihuan Road Chengdu 610065 China
| | - Qi Miao
- Department of Pharmaceutical and Biological EngineeringSchool of Chemical Engineering, Sichuan University No.24 South Section 1, Yihuan Road Chengdu 610065 China
| | - Lifang Ma
- Department of Pharmaceutical and Biological EngineeringSchool of Chemical Engineering, Sichuan University No.24 South Section 1, Yihuan Road Chengdu 610065 China
| | - Tao Lu
- Department of Pharmaceutical and Biological EngineeringSchool of Chemical Engineering, Sichuan University No.24 South Section 1, Yihuan Road Chengdu 610065 China
| | - Dong Yang
- Department of Pharmaceutical and Biological EngineeringSchool of Chemical Engineering, Sichuan University No.24 South Section 1, Yihuan Road Chengdu 610065 China
| | - Jiaming Chen
- Department of Pharmaceutical and Biological EngineeringSchool of Chemical Engineering, Sichuan University No.24 South Section 1, Yihuan Road Chengdu 610065 China
| | - Ziyuan Li
- Department of Pharmaceutical and Biological EngineeringSchool of Chemical Engineering, Sichuan University No.24 South Section 1, Yihuan Road Chengdu 610065 China
| |
Collapse
|
28
|
Hirose Y, Yamazaki M, Nogata M, Nakamura A, Maegawa T. Aromatic Halogenation Using N-Halosuccinimide and PhSSiMe3 or PhSSPh. J Org Chem 2019; 84:7405-7410. [DOI: 10.1021/acs.joc.9b00817] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuuka Hirose
- School of Pharmaceutical Sciences, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Mirai Yamazaki
- School of Pharmaceutical Sciences, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Misa Nogata
- School of Pharmaceutical Sciences, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Akira Nakamura
- School of Pharmaceutical Sciences, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Tomohiro Maegawa
- School of Pharmaceutical Sciences, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| |
Collapse
|
29
|
Düsel SJS, König B. Oxidative Photochlorination of Electron-Rich Arenes via in situ Bromination. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900411] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
| | - Burkhard König
- Institut für Organische Chemie; Universität Regensburg; Universitätsstraße 31 93053 Regensburg Germany
| |
Collapse
|
30
|
Sabuzi F, Pomarico G, Floris B, Valentini F, Galloni P, Conte V. Sustainable bromination of organic compounds: A critical review. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.01.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
31
|
Ikawa T, Masuda S, Akai S. Microflow Fluorinations of Benzynes: Efficient Synthesis of Fluoroaromatic Compounds. Chem Pharm Bull (Tokyo) 2018; 66:1153-1164. [DOI: 10.1248/cpb.c18-00578] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Takashi Ikawa
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Shigeaki Masuda
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Shuji Akai
- Graduate School of Pharmaceutical Sciences, Osaka University
| |
Collapse
|
32
|
Gazizov MB, Ivanova SY, Khairullin RA, Kirillina YS, Gazizova KS. Synthesis of 4-(Dibromomethyl)benzaldehyde by Catalytic Debromophosphoryl- and Phosphonyloxylation of 1,4-Bis(dibromomethyl)benzene with Phosphorus(IV) Acid Methyl Esters and Its Properties. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363218110014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
33
|
Rogers D, Brown RG, Brandeburg ZC, Ko EY, Hopkins MD, LeBlanc G, Lamar AA. Organic Dye-Catalyzed, Visible-Light Photoredox Bromination of Arenes and Heteroarenes Using N-Bromosuccinimide. ACS OMEGA 2018; 3:12868-12877. [PMID: 31458011 PMCID: PMC6644467 DOI: 10.1021/acsomega.8b02320] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Accepted: 09/25/2018] [Indexed: 05/25/2023]
Abstract
A variety of arenes and heteroarenes are brominated in good to excellent yields using N-bromosuccinimide (NBS) under mild and practical conditions. According to mechanistic investigations described within, the reaction is speculated to proceed via activation of NBS through a visible-light photoredox pathway utilizing erythrosine B as a photocatalyst. A photo-oxidative approach effectively amplifies the positive polarization on the bromine atom of the NBS reagent. This increase in the electrophilic nature of NBS results in drastically reduced reaction times and diversion from competing light-promoted reactive pathways.
Collapse
|
34
|
Čebular K, Božić BĐ, Stavber S. Esterification of Aryl/Alkyl Acids Catalysed by N-bromosuccinimide under Mild Reaction Conditions. Molecules 2018; 23:E2235. [PMID: 30200547 PMCID: PMC6225170 DOI: 10.3390/molecules23092235] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 08/30/2018] [Accepted: 08/31/2018] [Indexed: 11/24/2022] Open
Abstract
N-halosuccinimides (NXSs) are well-known to be convenient, easily manipulable and low-priced halogenation reagents in organic synthesis. In the present work, N-bromosuccinimide (NBS) has been promoted as the most efficient and selective catalyst among the NXSs in the reaction of direct esterification of aryl and alkyl carboxylic acids. Comprehensive esterification of substituted benzoic acids, mono-, di- and tri-carboxy alkyl derivatives has been performed under neat reaction conditions. The method is metal-free, air- and moisture-tolerant, allowing for a simple synthetic and isolation procedure as well as the large-scale synthesis of aromatic and alkyl esters with yields up to 100%. Protocol for the recycling of the catalyst has been proposed.
Collapse
Affiliation(s)
- Klara Čebular
- Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova 39, 1000 Ljubljana, Slovenia.
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia.
- Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
| | - Bojan Đ Božić
- Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
- Institute of Physiology and Biochemistry, Faculty of Biology, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia.
| | - Stojan Stavber
- Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova 39, 1000 Ljubljana, Slovenia.
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia.
- Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
| |
Collapse
|
35
|
Fumagalli L, Regazzoni LG, Straniero V, Valoti E, Aldini G, Vistoli G, Carini M, Picozzi C. Stressed degradation studies of domiphen bromide by LC-ESI-MS/MS identify a novel promising antimicrobial agent. J Pharm Biomed Anal 2018; 159:224-228. [PMID: 29990889 DOI: 10.1016/j.jpba.2018.06.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 06/26/2018] [Accepted: 06/27/2018] [Indexed: 11/17/2022]
Abstract
Nowadays, parabens have been replaced by domiphen bromide, which is widely used in pharmaceutical and cosmetic products. The main aim of this study was to investigate stressed degradation products of domiphen bromide by mean of a rapid, specific and reliable LC-ESI MS/MS since phenyl bromination may occur due to the oxidation of bromide counter ion under oxidative conditions. LC-ESI-MS/MS have characterized a new compound, p-bromodomiphen, as the only degradation product and structure elucidation was also confirmed by the synthesis of the standard. Notably, the resulting p-bromodomiphen bromide is more stable then domiphen bromide in oxidizing conditions since no di-bromoderivatives were detected by MS studies; both domiphen and its p-bromo derivative were tested for antibacterial activity and were more effective on Gram positive (Staphylococcus aureus ATCC25923 and Bacillus cereus DSM31) compared to Gram negative bacteria (Escherichia coli ATCC25922 and Pseudomonas aeruginosa DSM22644). In conclusion, stressed degradation studies by LC-ESI-MS/MS have characterized a new compound that comprises an alternative to domiphen bromide since its antimicrobial activity is comparable to, if not better than, the parental compound.
Collapse
Affiliation(s)
- Laura Fumagalli
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via Mangiagalli 25, I-20133, Milano, Italy.
| | - Luca Giovanni Regazzoni
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via Mangiagalli 25, I-20133, Milano, Italy
| | - Valentina Straniero
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via Mangiagalli 25, I-20133, Milano, Italy
| | - Ermanno Valoti
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via Mangiagalli 25, I-20133, Milano, Italy
| | - Giancarlo Aldini
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via Mangiagalli 25, I-20133, Milano, Italy
| | - Giulio Vistoli
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via Mangiagalli 25, I-20133, Milano, Italy
| | - Marina Carini
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via Mangiagalli 25, I-20133, Milano, Italy
| | - Claudia Picozzi
- Dipartimento di Scienze per gli Alimenti, la Nutrizione e l'Ambiente, Università degli Studi di Milano, Via Celoria 2, Milano, Italy
| |
Collapse
|
36
|
Rahu I, Kekišev O, Järv J, Burk P. Bromine formation in solid NaBr/KNO3 mixture and assay of this reaction via bromination of activated aromatics. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0526-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
37
|
Tang RJ, Milcent T, Crousse B. Regioselective Halogenation of Arenes and Heterocycles in Hexafluoroisopropanol. J Org Chem 2018; 83:930-938. [DOI: 10.1021/acs.joc.7b02920] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ren-Jin Tang
- Faculty of Pharmacy, UMR
8076, BioCIS, Univ. Paris-Sud-CNRS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| | - Thierry Milcent
- Faculty of Pharmacy, UMR
8076, BioCIS, Univ. Paris-Sud-CNRS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| | - Benoit Crousse
- Faculty of Pharmacy, UMR
8076, BioCIS, Univ. Paris-Sud-CNRS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| |
Collapse
|
38
|
Gupta AK, De D, Tomar K, Bharadwaj PK. A Cu(ii) metal–organic framework with significant H2 and CO2 storage capacity and heterogeneous catalysis for the aerobic oxidative amination of C(sp3)–H bonds and Biginelli reactions. Dalton Trans 2018; 47:1624-1634. [DOI: 10.1039/c7dt04006g] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
1 exhibits significant H2, CO2 storage capacity and heterogeneous catalytic activity for oxidative amination of C(sp3)–H bonds and Biginelli reactions.
Collapse
Affiliation(s)
- Anoop K. Gupta
- Department of Chemistry
- Indian Institute of Technology Kanpur
- India
| | - Dinesh De
- Department of Chemistry
- Indian Institute of Technology Kanpur
- India
| | - Kapil Tomar
- Department of Chemistry
- Indian Institute of Technology Kanpur
- India
| | | |
Collapse
|
39
|
Satkar Y, Ramadoss V, Nahide PD, García-Medina E, Juárez-Ornelas KA, Alonso-Castro AJ, Chávez-Rivera R, Jiménez-Halla JOC, Solorio-Alvarado CR. Practical, mild and efficient electrophilic bromination of phenols by a new I(iii)-based reagent: the PIDA–AlBr3system. RSC Adv 2018; 8:17806-17812. [PMID: 35542081 PMCID: PMC9080473 DOI: 10.1039/c8ra02982b] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Accepted: 05/03/2018] [Indexed: 11/21/2022] Open
Abstract
A practical electrophilic bromination procedure for the phenolic core was developed under efficient and very mild reaction conditions. The new I(iii)-based brominating reagentPhIOAcBroperationally easy to prepare by mixing PIDA and AlBr3was used.
Collapse
Affiliation(s)
- Yuvraj Satkar
- Universidad de Guanajuato
- Departamento de Química
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| | - Velayudham Ramadoss
- Universidad de Guanajuato
- Departamento de Química
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| | - Pradip D. Nahide
- Universidad de Guanajuato
- Departamento de Química
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| | - Ernesto García-Medina
- Universidad de Guanajuato
- Departamento de Química
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| | - Kevin A. Juárez-Ornelas
- Universidad de Guanajuato
- Departamento de Química
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| | - Angel J. Alonso-Castro
- Universidad de Guanajuato
- Departamento de Farmacia
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| | - Ruben Chávez-Rivera
- Universidad Michoacana de San Nicolás de Hidalgo
- Facultad de Químico Farmacobiología
- Morelia
- México
| | - J. Oscar C. Jiménez-Halla
- Universidad de Guanajuato
- Departamento de Química
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| | - César R. Solorio-Alvarado
- Universidad de Guanajuato
- Departamento de Química
- División de Ciencias Naturales y Exactas
- Guanajuato
- México
| |
Collapse
|
40
|
Abstract
Molecules of the title compound, C7H2Br2N2O2, haveC2vsymmetry and each lie on a twofold axis that bisects the benzene ring and its nitro and cyano substituents. The cyano N atom is bisected by two CN...Br contacts, and the nitro O atoms participate in weak C—H...O hydrogen bonds. These interactions form a planar sheet structure that stacks about a glide plane. This stacking mode has not been previously reported with cyano-halo-derived sheets of this type.
Collapse
|
41
|
Cunha S, Serafim JC, de Santana LLB, Damasceno F, Correia JTM, Santos AO, Oliveira M, Ribeiro J, Amparo J, Costa SL. One-Step Synthesis of 3,4-Diphenyl-2-pyrrolinones by Solvent-Free and Bi 2
O 3
-Catalyzed Approaches and Cytotoxicity Screening Against Glioma Cells. J Heterocycl Chem 2017. [DOI: 10.1002/jhet.2921] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Silvio Cunha
- Instituto de Química; Universidade Federal da Bahia; Campus de Ondina 40170-115 Salvador Bahia Brazil
- INCT em Energia e Ambiente; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Campus de Ondina Salvador Bahia 40170-290 Brazil
| | - José Claudio Serafim
- Instituto de Química; Universidade Federal da Bahia; Campus de Ondina 40170-115 Salvador Bahia Brazil
- INCT em Energia e Ambiente; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Campus de Ondina Salvador Bahia 40170-290 Brazil
| | - Lourenço Luis Botelho de Santana
- Instituto de Química; Universidade Federal da Bahia; Campus de Ondina 40170-115 Salvador Bahia Brazil
- INCT em Energia e Ambiente; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Campus de Ondina Salvador Bahia 40170-290 Brazil
| | - Fabiano Damasceno
- Instituto de Química; Universidade Federal da Bahia; Campus de Ondina 40170-115 Salvador Bahia Brazil
- INCT em Energia e Ambiente; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Campus de Ondina Salvador Bahia 40170-290 Brazil
| | - José Tiago Menezes Correia
- Instituto de Química; Universidade Federal da Bahia; Campus de Ondina 40170-115 Salvador Bahia Brazil
- INCT em Energia e Ambiente; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Campus de Ondina Salvador Bahia 40170-290 Brazil
| | - Airam Oliveira Santos
- Instituto de Química; Universidade Federal da Bahia; Campus de Ondina 40170-115 Salvador Bahia Brazil
- INCT em Energia e Ambiente; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Campus de Ondina Salvador Bahia 40170-290 Brazil
| | - Mona Oliveira
- Instituto de Ciências da Saúde, Departamento de Biofunção/Bioquímica; Laboratório de Neuroquímica e Biologia Celular; Salvador Bahia 40.110-100 Brazil
- INCT em Neurociência Translacional; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Salvador Bahia 40170-290 Brazil
| | - Janaína Ribeiro
- Instituto de Ciências da Saúde, Departamento de Biofunção/Bioquímica; Laboratório de Neuroquímica e Biologia Celular; Salvador Bahia 40.110-100 Brazil
- INCT em Neurociência Translacional; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Salvador Bahia 40170-290 Brazil
| | - Jéssika Amparo
- Instituto de Ciências da Saúde, Departamento de Biofunção/Bioquímica; Laboratório de Neuroquímica e Biologia Celular; Salvador Bahia 40.110-100 Brazil
- INCT em Neurociência Translacional; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Salvador Bahia 40170-290 Brazil
| | - Silvia Lima Costa
- Instituto de Ciências da Saúde, Departamento de Biofunção/Bioquímica; Laboratório de Neuroquímica e Biologia Celular; Salvador Bahia 40.110-100 Brazil
- INCT em Neurociência Translacional; Instituto Nacional de Ciência e Tecnologia, Universidade Federal da Bahia; Salvador Bahia 40170-290 Brazil
| |
Collapse
|
42
|
Pan D, Wang Y, Xiao G. A new protocol for the synthesis of 4,7,12,15-tetrachloro[2.2]paracyclophane. Beilstein J Org Chem 2017; 12:2443-2449. [PMID: 28144311 PMCID: PMC5238561 DOI: 10.3762/bjoc.12.237] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 11/02/2016] [Indexed: 11/23/2022] Open
Abstract
We report a green and convenient protocol to prepare 4,7,12,15-tetrachloro[2.2]paracyclophane, the precursor of parylene D, from 2,5-dichloro-p-xylene. In the first bromination step, with H2O2–HBr as a bromide source, this procedure becomes organic-waste-free and organic-solvent-free and can appropriately replace the existing bromination methods. The Winberg elimination–dimerization step, using aqueous sodium hydroxide solution instead of silver oxide for anion exchange, results in a significant improvement in product yield. Furthermore, four substituted [2.2]paracyclophanes were also prepared in this convenient way.
Collapse
Affiliation(s)
- Donghui Pan
- School of Chemistry and Chemical Engineering, Southeast University, 2 Dongnan Daxue Road, Nanjing, Jiangsu, 211189, P. R. China
| | - Yanbin Wang
- School of Chemistry and Chemical Engineering, Southeast University, 2 Dongnan Daxue Road, Nanjing, Jiangsu, 211189, P. R. China
| | - Guomin Xiao
- School of Chemistry and Chemical Engineering, Southeast University, 2 Dongnan Daxue Road, Nanjing, Jiangsu, 211189, P. R. China
| |
Collapse
|
43
|
Das R, Kapur M. Palladium-Catalyzed, ortho-Selective C-H Halogenation of Benzyl Nitriles, Aryl Weinreb Amides, and Anilides. J Org Chem 2017; 82:1114-1126. [PMID: 28029050 DOI: 10.1021/acs.joc.6b02731] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A palladium-catalyzed, ortho-selective C-H halogenation methodology is reported herein. The highlight of the work is the highly selective C(sp2)-H functionalization of benzyl nitriles in the presence of activated C(sp3)-H bond, which results in good yields of the halogenated products with excellent regioselectivity. Along with benzyl nitriles, aryl Weinreb amides and anilides have been evaluated for the transformation using aprotic conditions. Mechanistic studies yield interesting aspects with respect to the pathway of the reaction and the directing group abilities.
Collapse
Affiliation(s)
- Riki Das
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Bhopal, Madhya Pradesh 462 066, India
| | - Manmohan Kapur
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Bhopal, Madhya Pradesh 462 066, India
| |
Collapse
|
44
|
Ajvazi N, Stavber S. Transformation of Tertiary Benzyl Alcohols into the Vicinal Halo-Substituted Derivatives Using N-Halosuccinimides. Molecules 2016; 21:molecules21101325. [PMID: 27706096 PMCID: PMC6273677 DOI: 10.3390/molecules21101325] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 09/23/2016] [Accepted: 09/27/2016] [Indexed: 11/27/2022] Open
Abstract
The efficiency of direct conversion of tertiary alcohols bearing a β-hydrogen atom to vicinal halohydrins—chlorohydrins and bromohydrins—under green reaction conditions was tested preliminarily on model tertiary benzyl alcohols. Tertiary alcohols were successfully directly halogenated to vicinal halohydrins with N-halosuccinimide in aqueous media. The efficiency of the reaction in water was significantly improved in the presence of sodium dodecyl sulphate as the surfactant.
Collapse
Affiliation(s)
- Njomza Ajvazi
- Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia.
| | - Stojan Stavber
- Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia.
- Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins CIPKeBiP (Seat at Jožef Stefan Institute), Jamova 39, 1000 Ljubljana, Slovenia.
| |
Collapse
|
45
|
Affiliation(s)
- Nathan A. Romero
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - David A. Nicewicz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| |
Collapse
|
46
|
|
47
|
Saikia I, Borah AJ, Phukan P. Use of Bromine and Bromo-Organic Compounds in Organic Synthesis. Chem Rev 2016; 116:6837-7042. [PMID: 27199233 DOI: 10.1021/acs.chemrev.5b00400] [Citation(s) in RCA: 283] [Impact Index Per Article: 35.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Bromination is one of the most important transformations in organic synthesis and can be carried out using bromine and many other bromo compounds. Use of molecular bromine in organic synthesis is well-known. However, due to the hazardous nature of bromine, enormous growth has been witnessed in the past several decades for the development of solid bromine carriers. This review outlines the use of bromine and different bromo-organic compounds in organic synthesis. The applications of bromine, a total of 107 bromo-organic compounds, 11 other brominating agents, and a few natural bromine sources were incorporated. The scope of these reagents for various organic transformations such as bromination, cohalogenation, oxidation, cyclization, ring-opening reactions, substitution, rearrangement, hydrolysis, catalysis, etc. has been described briefly to highlight important aspects of the bromo-organic compounds in organic synthesis.
Collapse
Affiliation(s)
| | - Arun Jyoti Borah
- Department of Chemistry, Gauahti University , Guwahati-781014, Assam, India
| | - Prodeep Phukan
- Department of Chemistry, Gauahti University , Guwahati-781014, Assam, India
| |
Collapse
|
48
|
Banella MB, Gioia C, Vannini M, Colonna M, Celli A, Gandini A. A Sustainable Route to a Terephthalic Acid Precursor. CHEMSUSCHEM 2016; 9:942-945. [PMID: 27072163 DOI: 10.1002/cssc.201600166] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 03/13/2016] [Indexed: 06/05/2023]
Abstract
A new synthetic pathway for the production of p-toluic acid has been developed starting from reagents derived from renewable resources. A Diels-Alder reaction between sorbic and acrylic acids is followed by a combined dehydrogenation/ decarboxylation process, providing p-toluic acid in high yields. This route permits to use milder conditions compared to other Diels-Alder approaches reported in the literature, and therefore can contribute to a more sustainable terephthalic acid production.
Collapse
Affiliation(s)
- Maria Barbara Banella
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131, Bologna, Italy
| | - Claudio Gioia
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131, Bologna, Italy.
| | - Micaela Vannini
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131, Bologna, Italy
| | - Martino Colonna
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131, Bologna, Italy
| | - Annamaria Celli
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131, Bologna, Italy
| | - Alessandro Gandini
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, 40131, Bologna, Italy
| |
Collapse
|
49
|
|
50
|
Hao XQ, Shen MZ, Jian NG, Pang W, Shen XJ, Zhu X, Song MP. Synthesis of chiral S , N -thioimidazoline ligands for palladium-catalyzed asymmetric allylic alkylations. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.tetasy.2016.01.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|