1
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Kumar M, Sharma AK, Ishu K, Singh KN. Sulfur-Mediated Decarboxylative Amidation of Cinnamic Acids via C═C Bond Cleavage. J Org Chem 2024; 89:9888-9895. [PMID: 38920263 DOI: 10.1021/acs.joc.4c00669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
A new strategy for the synthesis of amides has been developed using sulfur-mediated decarboxylative coupling of cinnamic acids with amines via oxidative cleavage of the C═C bond.
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Affiliation(s)
- Mahesh Kumar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Anup Kumar Sharma
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Km Ishu
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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2
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Ryoo JY, Han MS. Development of boronic acid catalysts for direct amidation of aromatic carboxylic acids using fluorescence-based screening. Org Biomol Chem 2024. [PMID: 39012343 DOI: 10.1039/d4ob00576g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
Direct amidation of carboxylic acids with amines holds significant importance; therefore, catalytic processes involving boronic acids have undergone extensive investigation. However, studies focused on the amidation of aromatic carboxylic acids remain limited. In this study, we introduce a fluorescence-based screening methodology employing an anthracene derivative probe, facilitating the rapid evaluation of various amidation catalysts. Using this approach, boronic acids were evaluated for their catalytic potential. Our findings reveal that 2-hydroxyphenylboronic acid (C7), previously deemed inefficient for aliphatic acids, effectively catalyzes the amidation of aromatic acids. The catalysts identified through this method consistently achieved high yields, reaching up to 98% across a broad spectrum of substrates.
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Affiliation(s)
- Jeong Yup Ryoo
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123, Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Republic of Korea.
| | - Min Su Han
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123, Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Republic of Korea.
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3
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Dey A, Chakraborty S, Singh A, Rahimi FA, Biswas S, Mandal T, Maji TK. Microwave Assisted Fast Synthesis of a Donor-Acceptor COF Towards Photooxidative Amidation Catalysis. Angew Chem Int Ed Engl 2024; 63:e202403093. [PMID: 38679566 DOI: 10.1002/anie.202403093] [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: 02/13/2024] [Revised: 03/30/2024] [Accepted: 04/25/2024] [Indexed: 05/01/2024]
Abstract
The synthesis of covalent organic frameworks (COFs) at bulk scale require robust, straightforward, and cost-effective techniques. However, the traditional solvothermal synthetic methods of COFs suffer low scalability as well as requirement of sensitive reaction environment and multiday reaction time (2-10 days) which greatly restricts their practical application. Here, we report microwave assisted rapid and optimized synthesis of a donor-acceptor (D-A) based highly crystalline COF, TzPm-COF in second (10 sec) to minute (10 min) time scale. With increasing the reaction time from seconds to minutes crystallinity, porosity and morphological changes are observed for TzPm-COF. Owing to visible range light absorption, suitable band alignment, and low exciton binding energy (Eb=64.6 meV), TzPm-COF can efficaciously produce superoxide radical anion (O2 .-) after activating molecular oxygen (O2) which eventually drives aerobic photooxidative amidation reaction with high recyclability. This photocatalytic approach works well with a variety of substituted aromatic aldehydes having electron-withdrawing or donating groups and cyclic, acyclic, primary or secondary amines with moderate to high yield. Furthermore, catalytic mechanism was established by monitoring the real-time reaction progress through in situ diffuse reflectance infrared Fourier transform spectroscopic (DRIFTS) study.
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Affiliation(s)
- Anupam Dey
- Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), School of Advanced Materials (SAMat), International Centre for Materials Science (ICMS), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Samiran Chakraborty
- Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), School of Advanced Materials (SAMat), International Centre for Materials Science (ICMS), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Ashish Singh
- Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), School of Advanced Materials (SAMat), International Centre for Materials Science (ICMS), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Faruk Ahamed Rahimi
- Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), School of Advanced Materials (SAMat), International Centre for Materials Science (ICMS), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Sandip Biswas
- Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), School of Advanced Materials (SAMat), International Centre for Materials Science (ICMS), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Tamagna Mandal
- Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), School of Advanced Materials (SAMat), International Centre for Materials Science (ICMS), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Tapas Kumar Maji
- Molecular Materials Laboratory, Chemistry and Physics of Materials Unit (CPMU), School of Advanced Materials (SAMat), International Centre for Materials Science (ICMS), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
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4
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Wang MC, Yang XY, Zhou JF, Zhang WX, Li BJ. Pyridine-borane complex-catalysed thioesterification: the direct conversion of carboxylic acids to thioesters. Chem Commun (Camb) 2024; 60:6671-6674. [PMID: 38860640 DOI: 10.1039/d4cc01326c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2024]
Abstract
Thioesters are a common class of biologically active fragments and synthetically useful building blocks. An attractive synthetic approach would be to use simple and bench-stable carboxylic acids as a coupling partner. Herein, we present a 4-bromo pyridine-borane complex as a catalyst for the direct coupling of carboxylic acids with thiols. A wide range of thioesters with good functional group compatibility could be prepared via this metal-free approach. The merit of this strategy is exemplified by the modification of carboxylic acid-containing drugs.
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Affiliation(s)
- Ming-Chuan Wang
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, People's Republic of China.
| | - Xue-Ying Yang
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, People's Republic of China.
| | - Jian-Feng Zhou
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, People's Republic of China.
| | - Wan-Xuan Zhang
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, People's Republic of China.
| | - Bin-Jie Li
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, People's Republic of China.
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5
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Henry M, Minty L, Kwok ACW, Elwood JML, Foulis AJ, Pettinger J, Jamieson C. One-Pot Oxidative Amidation of Aldehydes via the Generation of Nitrile Imine Intermediates. J Org Chem 2024; 89:7913-7926. [PMID: 38778786 PMCID: PMC11165588 DOI: 10.1021/acs.joc.4c00575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/22/2024] [Accepted: 05/16/2024] [Indexed: 05/25/2024]
Abstract
A one-pot procedure for the oxidative amidation of aldehydes via the in situ generation of reactive nitrile imine (NI) intermediates has been developed. Distinct from our progenitor processes, mechanistic and control experiments revealed that the NI undergoes rapid oxidation to an acyl diazene species, which then facilitates N-acylation of an amine. A range of substrates have been explored, including application in the synthesis of pharmaceutically relevant compounds.
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Affiliation(s)
- Martyn
C. Henry
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, United
Kingdom
| | - Laura Minty
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, United
Kingdom
| | - Alexander C. W. Kwok
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, United
Kingdom
| | - Jessica M. L. Elwood
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, United
Kingdom
| | - Adam J. Foulis
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, United
Kingdom
| | - Jonathan Pettinger
- GSK,
Medicines Research Centre, Gunnels Wood Road, Stevenage SG1 2NY, United Kingdom
| | - Craig Jamieson
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, United
Kingdom
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6
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Ramachandran PV, Singh A, Walker H, Hamann HJ. Borane-Pyridine: An Efficient Catalyst for Direct Amidation. Molecules 2024; 29:268. [PMID: 38202849 PMCID: PMC10780903 DOI: 10.3390/molecules29010268] [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: 12/01/2023] [Revised: 12/21/2023] [Accepted: 12/26/2023] [Indexed: 01/12/2024] Open
Abstract
Borane-pyridine acts as an efficient (5 mol%) liquid catalyst, providing improved solubility for the direct amidation of a wide range of aromatic and aliphatic carboxylic acids and amines to form secondary and tertiary carboxamides. Tolerance of potentially incompatible halo, nitro, and alkene functionalities has been demonstrated.
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7
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Ramachandran PV, Choudhary S. One-Pot, Tandem Reductive Amination/Alkylation-Cycloamidation for Lactam Synthesis from Keto or Amino Acids. J Org Chem 2023; 88:15956-15963. [PMID: 37932035 DOI: 10.1021/acs.joc.3c01126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
Monotrifluoroacetoxyborane-amines, prepared by treating borane-amines with trifluoroacetic acid, have been shown to be efficient reagents for a one-pot, tandem reductive amination/alkylation-cycloamidation of keto or amino acids to achieve the synthesis of 5-aryl or 5-methyl pyrrolidin-2-ones and 6-aryl or 6-methyl piperidin-2-ones.
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Affiliation(s)
| | - Shivani Choudhary
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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8
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Ramachandran PV, Alawaed AA, Singh A. Titanium-Mediated Reduction of Carboxamides to Amines with Borane-Ammonia. Molecules 2023; 28:4575. [PMID: 37375131 DOI: 10.3390/molecules28124575] [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: 05/16/2023] [Revised: 06/02/2023] [Accepted: 06/03/2023] [Indexed: 06/29/2023] Open
Abstract
In this study, the successful titanium tetrachloride-catalyzed reduction of aldehydes, ketones, carboxylic acids, and nitriles with borane-ammonia was extended to the reduction (deoxygenation) of a variety of aromatic and aliphatic pri-, sec- and tert-carboxamides, by changing the stoichiometry of the catalyst and reductant. The corresponding amines were isolated in good to excellent yields, following a simple acid-base workup.
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Affiliation(s)
| | - Abdulkhaliq A Alawaed
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
| | - Aman Singh
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
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9
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Ramachandran PV, Alawaed AA, Hamann HJ. A Safer Reduction of Carboxylic Acids with Titanium Catalysis. Org Lett 2022; 24:8481-8486. [PMID: 36377825 DOI: 10.1021/acs.orglett.2c03326] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ammonia-borane, shown previously to react with carboxylic acids under reflux to form primary amides, reduces acids to alcohols at room temperature in the presence of catalytic TiCl4. The process, which is tolerant of a variety of potentially reactive functional groups, including N-protected amino acids, can be employed for the selective reduction of acids in the presence of amides, nitriles and, to some extent, esters. Aliphatic acids can be selectively reduced in the presence of aromatic acids.
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Affiliation(s)
| | - Abdulkhaliq A Alawaed
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Henry J Hamann
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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10
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Zhou J, Paladino M, Hall DG. Direct Boronic Acid Promoted Amidation of Carboxylic Acids with Poorly Nucleophilic Amines. European J Org Chem 2022. [DOI: 10.1002/ejoc.202201050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jingning Zhou
- Department of Chemistry University of Alberta 4-010 Centennial Centre for Interdisciplinary Science T6G 2G2 Edmonton Alberta Canada
| | - Marco Paladino
- Department of Chemistry University of Alberta 4-010 Centennial Centre for Interdisciplinary Science T6G 2G2 Edmonton Alberta Canada
| | - Dennis G. Hall
- Department of Chemistry University of Alberta 4-010 Centennial Centre for Interdisciplinary Science T6G 2G2 Edmonton Alberta Canada
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11
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Ramachandran PV, Alawaed AA, Hamann HJ. TiCl 4-Catalyzed Hydroboration of Ketones with Ammonia Borane. J Org Chem 2022; 87:13259-13269. [PMID: 36094411 DOI: 10.1021/acs.joc.2c01744] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Investigation of a variety of Lewis acids for the hydroboration-hydrolysis (reduction) of ketones with amine-boranes has revealed that catalytic (10 mol %) titanium tetrachloride (TiCl4) in diethyl ether at room temperature immensely accelerates the reaction of ammonia borane. The product alcohols are produced in good to excellent yields within 30 min, even with ketones which typically requires 24 h or longer to reduce under uncatalyzed conditions. Several potentially reactive functionalities are tolerated, and substituted cycloalkanones are reduced diastereoselectively to the thermodynamic product. A deuterium labeling study and 11B NMR analysis of the reaction have been performed to verify the proposed hydroboration mechanism.
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Affiliation(s)
| | - Abdulkhaliq A Alawaed
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Henry J Hamann
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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12
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Mart M, Jurczak J, Karakaya I. Efficient catalyst-free direct amidation of non-activated carboxylic acids from carbodiimides. Org Biomol Chem 2022; 20:7900-7906. [PMID: 35979745 DOI: 10.1039/d2ob01322c] [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
A novel and efficient catalyst- and activating agent-free amidation method via direct amidation of carboxylic acids where carbodiimides act as a reagent instead of an activating agent is reported. The reaction is conducted under non-traditional coupling conditions where a higher temperature is employed. Besides not using stoichiometric ratios of activating agent or catalyst, this approach is made even more attractive by occurring in the presence of the environmentally friendly and recyclable non-toxic solvent of DMSO. A wide variety of benzylic, aliphatic, α,β-unsaturated and aromatic carboxylic acids provide related amides in up to 95% yield. The excellent yield from a gram-scale reaction shows that this application is particularly convenient for larger-scale synthesis applications.
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Affiliation(s)
- Mehmet Mart
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka, 44/52, 01-224, Warsaw, Poland.
| | - Janusz Jurczak
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka, 44/52, 01-224, Warsaw, Poland.
| | - Idris Karakaya
- Department of Chemistry, College of Basic Sciences, Gebze Technical University, 41400 Gebze, Turkey.
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13
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Sathyendran S, Senadi GC. An Umpolung Route to Amides from α‐Aminonitriles under Metal‐Free Conditions. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Wu QX, Shu T, Fang WY, Qin HL. Discovery of KOH+BrCH2SO2F as a Water‐Removable System for the Clean, Mild and Robust Synthesis of Amides and Peptides. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Qi-Xin Wu
- Wuhan University of Technology School of Chemistry, Chemical Engineering and Life Sciences Wuhan CHINA
| | - Tao Shu
- Wuhan University of Technology School of Chemistry, Chemical Engineering and Life Sciences Wuhan CHINA
| | - Wan-Yin Fang
- Wuhan University of Technology School of Chemistry, Chemical Engineering and Life Sciences Wuhan CHINA
| | - Hua-Li Qin
- Wuhan University of Technology Chemistry 205 Luoshi Road 430070 Wuhan CHINA
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15
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Li H, Kang JX, Ju M, Wang ZZ, Liu Z, Wang J, Xu CQ, He S, Nag A. Iodine Induced Cyclization of Sodium Aminodiboranate: Reactivity and Mechanisms Investigation. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Ramachandran PV, Hamann HJ, Mishra S. Aminoboranes via Tandem Iodination/Dehydroiodination for One-Pot Borylation. ACS OMEGA 2022; 7:14377-14389. [PMID: 35573212 PMCID: PMC9089688 DOI: 10.1021/acsomega.2c01461] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 03/31/2022] [Indexed: 06/15/2023]
Abstract
A rapid synthesis of aminoboranes from amine-boranes utilizing an iodination/dehydroiodination sequence is described. Monomeric aminoboranes are generated exclusively from several substrate adducts, following an E2-type elimination, with the added base playing a critical role in monomer vs dimer formation. Diisopropylaminoborane formed using this methodology has been applied to a one-pot palladium-catalyzed conversion of iodo- and bromoarenes to the corresponding boronates. Additionally, modification of the workup allows for isolation of the boronic acid and recovery of the utilized amine.
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Affiliation(s)
| | - Henry J. Hamann
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
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17
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Sardar B, Jamatia R, Samanta A, Srimani D. Ru Doped Hydrotalcite Catalyzed Borrowing Hydrogen-Mediated N-Alkylation of Benzamides, Sulfonamides, and Dehydrogenative Synthesis of Quinazolinones. J Org Chem 2022; 87:5556-5567. [PMID: 35442678 DOI: 10.1021/acs.joc.1c02913] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient Ru doped hydrotalcite catalyzed N-alkylation of benzamides and sulfonamides with alcohols via borrowing hydrogen catalysis is illustrated. Various primary alcohols, including benzyl, heteroaryl, and aliphatic alcohols, were alkylated in good to excellent yields. To shed light on the mechanistic details, several control studies and deuterium labeling experiments were performed. Mechanistic studies underpin that the reaction is going via a borrowing hydrogen pathway rather than an SN1 type mechanism. The reaction can be easily scaled up without any detrimental effect on the yield. The catalyst is also capable of synthesizing quinazolinone directly from 2-aminobenzamide and alcohols. Successful recyclability and high reactivity highlight the practical applicability of the catalyst.
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Affiliation(s)
- Bitan Sardar
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam, Guwahati Pin 781039, India
| | - Ramen Jamatia
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam, Guwahati Pin 781039, India.,Department of Chemistry, Rajiv Gandhi University, Rono Hills, Doimukh, Arunachal Pradesh 791112, India
| | - Arup Samanta
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam, Guwahati Pin 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam, Guwahati Pin 781039, India
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18
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Braddock DC, Davies JJ, Lickiss PD. Methyltrimethoxysilane (MTM) as a Reagent for Direct Amidation of Carboxylic Acids. Org Lett 2022; 24:1175-1179. [PMID: 35084870 PMCID: PMC9007566 DOI: 10.1021/acs.orglett.1c04265] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
![]()
Methyltrimethoxysilane [MTM, CH3Si(OMe)3]
has been demonstrated to be an effective, inexpensive, and safe reagent
for the direct amidation of carboxylic acids with amines. Two simple
workup procedures that provide the pure amide product without the
need for further purification have been developed. The first employs
an aqueous base-mediated annihilation of MTM. The second involves
simple product crystallization from the reaction mixture providing
a low process mass intensity
direct amidation protocol.
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Affiliation(s)
- D Christopher Braddock
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, U.K
| | - Joshua J Davies
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, U.K
| | - Paul D Lickiss
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, U.K
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19
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Li Q, Dai P, Tang H, Zhang M, Wu J. Photomediated reductive coupling of nitroarenes with aldehydes for amide synthesis. Chem Sci 2022; 13:9361-9365. [PMID: 36093005 PMCID: PMC9384791 DOI: 10.1039/d2sc03047k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 07/15/2022] [Indexed: 12/31/2022] Open
Abstract
In view of the widespread significance of amide functional groups in organic synthesis and pharmaceutical studies, an efficient and practical synthetic protocol that avoids the use of stoichiometric activating reagents or metallic reductants is highly desirable.
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Affiliation(s)
- Qingyao Li
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Peng Dai
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Haidi Tang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Muliang Zhang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Jie Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
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20
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Zhang Y, de Azambuja F, Parac-Vogt TN. Zirconium oxo clusters as discrete molecular catalysts for the direct amide bond formation. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00421f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A discrete dodecanuclear Zr oxo cluster catalyzed the direct formation of amide bonds without the need of water scavenging or dry reactions conditions showcasing the potential of these molecular clusters to become a new class of efficient catalysts.
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Affiliation(s)
- Yujie Zhang
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
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21
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Kumar V, Dhawan S, Girase PS, Singh P, Karpoormath R. An Environmentally Benign, Catalyst‐Free N−C Bond Cleavage/Formation of Primary, Secondary, and Tertiary Unactivated Amides. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101114] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vishal Kumar
- Department of Pharmaceutical Chemistry Discipline of Pharmaceutical Sciences College of Health Sciences University of KwaZulu-Natal (Westville) Durban 4000 South Africa
| | - Sanjeev Dhawan
- Department of Pharmaceutical Chemistry Discipline of Pharmaceutical Sciences College of Health Sciences University of KwaZulu-Natal (Westville) Durban 4000 South Africa
| | - Pankaj Sanjay Girase
- Department of Pharmaceutical Chemistry Discipline of Pharmaceutical Sciences College of Health Sciences University of KwaZulu-Natal (Westville) Durban 4000 South Africa
| | - Parvesh Singh
- School of Chemistry and Physics University of KwaZulu-Natal P/Bag X54001, Westville Durban 4000 South Africa
| | - Rajshekhar Karpoormath
- Department of Pharmaceutical Chemistry Discipline of Pharmaceutical Sciences College of Health Sciences University of KwaZulu-Natal (Westville) Durban 4000 South Africa
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22
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Hassan Tolba A, Krupička M, Chudoba J, Cibulka R. Amide Bond Formation via Aerobic Photooxidative Coupling of Aldehydes with Amines Catalyzed by a Riboflavin Derivative. Org Lett 2021; 23:6825-6830. [PMID: 34424722 DOI: 10.1021/acs.orglett.1c02391] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report an effective, operationally simple, and environmentally friendly system for the synthesis of tertiary amides by the oxidative coupling of aromatic or aliphatic aldehydes with amines mediated by riboflavin tetraacetate (RFTA), an inexpensive organic photocatalyst, and visible light using oxygen as the sole oxidant. The method is based on the oxidative power of an excited flavin catalyst and the relatively low oxidation potential of the hemiaminal formed by amine to aldehyde addition.
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23
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Ning Y, Wang S, Li M, Han J, Zhu C, Xie J. Site-specific Umpolung amidation of carboxylic acids via triplet synergistic catalysis. Nat Commun 2021; 12:4637. [PMID: 34330910 PMCID: PMC8324892 DOI: 10.1038/s41467-021-24908-w] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 07/07/2021] [Indexed: 01/20/2023] Open
Abstract
Development of catalytic amide bond-forming methods is important because they could potentially address the existing limitations of classical methods using superstoichiometric activating reagents. In this paper, we disclose an Umpolung amidation reaction of carboxylic acids with nitroarenes and nitroalkanes enabled by the triplet synergistic catalysis of FeI2, P(V)/P(III) and photoredox catalysis, which avoids the production of byproducts from stoichiometric coupling reagents. A wide range of carboxylic acids, including aliphatic, aromatic and alkenyl acids participate smoothly in such reactions, generating structurally diverse amides in good yields (86 examples, up to 97% yield). This Umpolung amidation strategy opens a method to address challenging regioselectivity issues between nucleophilic functional groups, and complements the functional group compatibility of the classical amidation protocols. The synthetic robustness of the reaction is demonstrated by late-stage modification of complex molecules and gram-scale applications. Catalytic amide bond-forming methods is important because they could potentially address the existing limitations of classical methods using superstoichiometric activating reagents. Here the authors show an Umpolung amidation reaction of carboxylic acids with nitroarenes and nitroalkanes enabled by FeI2, P(V)/P(III) and photoredox catalysis that avoids the production of byproducts.
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Affiliation(s)
- Yunyun Ning
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China
| | - Shuaishuai Wang
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China
| | - Muzi Li
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China
| | - Jie Han
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China
| | - Chengjian Zhu
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China.,College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, China
| | - Jin Xie
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China. .,Advanced Catalytic Engineering Research Center of the Ministry of Education, Hunan University, Changsha, China.
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24
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Li H, Li Y, Kang J, Fan L, Yang Q, Li S, Rahman A, Chen D. Reactivity and mechanisms of hydridic hydrogen of B–H in ammonia borane towards acetic acids: the ammonia B-monoacyloxy boranes. NEW J CHEM 2021. [DOI: 10.1039/d1nj01727f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
B-monoacyloxy boranes are first obtained by moderate reactions of ammonia borane with acetic acids.
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Affiliation(s)
- Huizhen Li
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
| | - Yunhui Li
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
| | - Jiaxin Kang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Lin Fan
- Beijing Normal University Publishing Group
- College of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Qiuyu Yang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Shujun Li
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Abdul Rahman
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
| | - Daqi Chen
- School of Mechanical and Electrical Engineering
- Guangzhou University
- Guangzhou
- P. R. China
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