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Mosquera J, Bismuto A. Highlights from the 57th Bürgenstock Conference on Stereochemistry 2024. Chem Sci 2024; 15:9392-9396. [PMID: 38939160 PMCID: PMC11205270 DOI: 10.1039/d4sc90102a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2024] Open
Abstract
Herein, we share an overview of the scientific highlights from speakers at the latest edition of the longstanding Bürgenstock Conference.
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Affiliation(s)
- Jesús Mosquera
- Universidade da Coruña, CICA - Centro Interdisciplinar de Química e Bioloxía Rúa as Carballeiras 15071 A Coruña Spain
| | - Alessandro Bismuto
- Institute of Inorganic Chemistry, University of Bonn Gerhard-Domagk-Str. 1 53121 Bonn Germany
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2
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Lin W, Alix A, Guillot R, Gandon V, Bour C. Aluminum-Catalyzed Intramolecular Vinylation of Arenes by Vinyl Cations. Org Lett 2024; 26:3267-3272. [PMID: 38574281 DOI: 10.1021/acs.orglett.4c00889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
This study addresses the challenges associated with vinyl cation generation, a process that traditionally requires quite specific counterions. Described herein is a novel intramolecular vinylation of arenes catalyzed by aluminum(III) chloride, utilizing practical conditions and readily available vinyl triflates derived from 2-aceto-3-arylpropionates. Comprehensive experimental data support diverse carbocycle synthesis, exemplified by indenes and higher analogues. Control experiments verify the applicability of the vinylation protocol, and synthetic applications showcase a potent tubulin polymerization inhibitor with anticancer properties. Density functional theory computations reveal a Lewis-acid-driven mechanism involving triflate moiety abstraction to generate a reactive vinyl cation.
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Affiliation(s)
- Wenhua Lin
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Aurélien Alix
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Christophe Bour
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
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3
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Zou S, Zhao Z, Huang H. Enantioselective Ring-Closing Aminomethylamination of Allylic Aminodienes with Aminals Triggered by C-N Bond Metathesis. Org Lett 2024. [PMID: 38502801 DOI: 10.1021/acs.orglett.4c00641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
A conceptually novel strategy utilizing a cyclopalladated complex as an electrophile to activate the C-N bond for the C-N bond metathesis between allylamines and aminals is developed, which enables an efficient ring-closing aminomethylamination of allylic aminodienes and aminals. The reaction proceeds under mild reaction conditions and displays a remarkable scope. Utilizing a modified Trost-type diphosphine as the ligand, this method enables the efficient synthesis of 5-10-membered aminoallylated chiral N-heterocycles in good yields with high enantiomeric excess values.
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Affiliation(s)
- Suchen Zou
- Key Laboratory of Precision and Intelligent Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Zeyu Zhao
- Key Laboratory of Precision and Intelligent Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Hanmin Huang
- Key Laboratory of Precision and Intelligent Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Huaibei Normal University, Huaibei, Anhui 235000, People's Republic of China
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4
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To TA, Nguyen TV. Olefination of Aromatic Carbonyls via Site-Specific Activation of Cycloalkanone Ketals. Angew Chem Int Ed Engl 2024; 63:e202317003. [PMID: 37997004 DOI: 10.1002/anie.202317003] [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: 11/09/2023] [Revised: 11/22/2023] [Accepted: 11/23/2023] [Indexed: 11/25/2023]
Abstract
Skeletal editing is an important strategy in organic synthesis as it modifies the carbon backbone to tailor molecular structures with precision, enabling access to compounds with specific desired properties. Skeletal editing empowers chemists to transform synthetic approaches of target compounds across diverse applications from drug discovery to materials science. Herein, we introduce a new skeletal editing method to convert readily available aromatic carbonyl compounds into valuable unsaturated carboxylic acids with extended carbon chains. Our reaction setup enables a cascade reaction of enolization-[2+2]cycloaddition-[2+2]cycloreversion between aromatic carbonyl compounds and ketals of cyclic ketones to generate unsaturated carboxylic acids as ring-opening products. Through a simple design, our substrates are specifically activated to react at predetermined positions to enhance selectivity and efficiency. This practical method offers convenient access to versatile organic building blocks as well as provides fresh insights into manipulating traditional reaction pathways for new synthetic applications.
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Affiliation(s)
- Tuong Anh To
- School of Chemistry, University of New South Wales, Sydney Anzac Parade, Kensington, NSW 2052, Australia
| | - Thanh Vinh Nguyen
- School of Chemistry, University of New South Wales, Sydney Anzac Parade, Kensington, NSW 2052, Australia
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5
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Todtz SR, Schneider CW, Malakar T, Anderson C, Koska H, Zimmerman PM, Devery JJ. Controlling Catalyst Behavior in Lewis Acid-Catalyzed Carbonyl-Olefin Metathesis. J Am Chem Soc 2023; 145:13069-13080. [PMID: 37279356 PMCID: PMC10517625 DOI: 10.1021/jacs.3c01508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Lewis acid-catalyzed carbonyl-olefin metathesis has introduced a new means for revealing the behavior of Lewis acids. In particular, this reaction has led to the observation of new solution behaviors for FeCl3 that may qualitatively change how we think of Lewis acid activation. For example, catalytic metathesis reactions operate in the presence of superstoichiometric amounts of carbonyl, resulting in the formation of highly ligated (octahedral) iron geometries. These structures display reduced activity, decreasing catalyst turnover. As a result, it is necessary to steer the Fe-center away from inhibiting pathways to improve the reaction efficiency and augment yields for recalcitrant substrates. Herein, we examine the impact of the addition of TMSCl to FeCl3-catalyzed carbonyl-olefin metathesis, specifically for substrates that are prone to byproduct inhibition. Through kinetic, spectroscopic, and colligative experiments, significant deviations from the baseline metathesis reactivity are observed, including mitigation of byproduct inhibition as well as an increase in the reaction rate. Quantum chemical simulations are used to explain how TMSCl induces a change in catalyst structure that leads to these kinetic differences. Collectively, these data are consistent with the formation of a silylium catalyst, which induces the reaction through carbonyl binding. The FeCl3 activation of Si-Cl bonds to give the silylium active species is expected to have significant utility in enacting carbonyl-based transformations.
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Affiliation(s)
- Sophi R Todtz
- Department of Chemistry & Biochemistry, Loyola University Chicago, Flanner Hall, 1068 W Sheridan Road, Chicago, Illinois 60660, United States
| | - Cory W Schneider
- Department of Chemistry & Biochemistry, Loyola University Chicago, Flanner Hall, 1068 W Sheridan Road, Chicago, Illinois 60660, United States
| | - Tanmay Malakar
- Department of Chemistry, Barasat College, 10 K.N.C. Road, Barasat, Kolkata 700124, West Bengal, India
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Clare Anderson
- Department of Chemistry & Biochemistry, Loyola University Chicago, Flanner Hall, 1068 W Sheridan Road, Chicago, Illinois 60660, United States
| | - Heather Koska
- Department of Chemistry & Biochemistry, Loyola University Chicago, Flanner Hall, 1068 W Sheridan Road, Chicago, Illinois 60660, United States
| | - Paul M Zimmerman
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - James J Devery
- Department of Chemistry & Biochemistry, Loyola University Chicago, Flanner Hall, 1068 W Sheridan Road, Chicago, Illinois 60660, United States
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6
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McAtee CC, Nasrallah DJ, Ryu H, Gatazka MR, McAtee RC, Baik MH, Schindler CS. Catalytic, Interrupted Carbonyl-Olefin Metathesis for the Formation of Functionalized Cyclopentadienes. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Christopher C. McAtee
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Daniel J. Nasrallah
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Ho Ryu
- Korea Advanced Institute of Science and Technology, Daejon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejon 34141, Republic of Korea
| | - Michael R. Gatazka
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Rory C. McAtee
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Mu-Hyun Baik
- Korea Advanced Institute of Science and Technology, Daejon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejon 34141, Republic of Korea
| | - Corinna S. Schindler
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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Worsawat P, Noppawan P, Croise C, Supanchaiyamat N, McElroy CR, Hunt AJ. Acid-catalysed reactions of amines with dimethyl carbonate. Org Biomol Chem 2023; 21:1070-1081. [PMID: 36629051 DOI: 10.1039/d2ob02222b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Highly effective acid-catalysed reactions of amines with dimethyl carbonate (DMC) have been conducted with significant yields and selectivity of carboxymethylation or methylation products. Lewis acids (FeCl3, ZnCl2, and AlCl3·6H2O), Brønsted acids (PTSA, acetic, and formic acids), and acids supported on silica (silica sulfuric and silica perchlorate) resulted in carboxymethylation of primary aliphatic amines with high conversions. It was found that the Lewis acid FeCl3 also promoted carboxymethylation of primary aromatic amines and secondary amines. At both 90 °C or an elevated temperature of 150 °C under pressure, AlCl3·6H2O demonstrated highly selective monomethylation of aromatic amines. In addition, both silica sulfuric acid and silica perchlorate at 90 °C exhibited no conversion for secondary amines but enhanced carboxymethylation with high conversions of 80.7-87.5% and selectivity of >99.00% at 150 °C in a pressure reactor. At 1.0 equivalent, both promoted excellent conversion and selectivity of primary aliphatic amines at 90 °C. In addition, they were easily recovered and reused for at least four additional reactions without significant loss of efficiency with consistent conversions and selectivity. Green metrics evaluation for the silica sulfuric acid-catalysed reaction highlighted the sustainability features of the process. Silica-supported catalysts are highly stable, making them ideal alternative catalysts for the methylation and carbonylation of various amines with DMC. Acid-catalysed DMC reactions of amines may expand the substrate scope and offer new opportunities for developing sustainable organic synthetic methodologies.
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Affiliation(s)
- Pattamabhorn Worsawat
- Materials Chemistry Research Center (MCRC), Centre of Excellence for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
| | - Pakin Noppawan
- Department of Chemistry, Faculty of Science, Mahasarakham University, Maha Sarakham, 44150, Thailand
| | - Charlotte Croise
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, YO10 5DD, UK.,Institute of Chemistry, University of Poitiers, 86000 Poitiers, France
| | - Nontipa Supanchaiyamat
- Materials Chemistry Research Center (MCRC), Centre of Excellence for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
| | - Con R McElroy
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, YO10 5DD, UK
| | - Andrew J Hunt
- Materials Chemistry Research Center (MCRC), Centre of Excellence for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
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8
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Sharma D, Benny A, Gupta R, Jemmis ED, Venugopal A. Crystallographic evidence for a continuum and reversal of roles in primary-secondary interactions in antimony Lewis acids: applications in carbonyl activation. Chem Commun (Camb) 2022; 58:11009-11012. [PMID: 36097954 DOI: 10.1039/d2cc04027a] [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
Primary and secondary interactions form the basis of substrate activation in Lewis-acid mediated catalysis, with most substrate activations occurring at the secondary binding site. We explore two series of antimony cations, [(NMe2CH2C6H4)(mesityl)Sb]+ (A) and [(NMe2C6H4)(mesityl)Sb]+ (B), by coordinating ligands with varying nucleophilicity at the position trans to the N-donor. The decreased nucleophilicity of the incoming ligands leads to reversal from a primary bond to a secondary interaction in A, whereas a constrained N-coordination in B diminishes the border between primary and secondary bonding. Investigations on carbonyl olefin metathesis reactions and carbonyl reduction demonstrate increased reactivity of a Lewis acid when the substrate activation occurs at the primary binding site.
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Affiliation(s)
- Deepti Sharma
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram, 695551, India.
| | - Annabel Benny
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram, 695551, India.
| | - Radhika Gupta
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Eluvathingal D Jemmis
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Ajay Venugopal
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram, 695551, India.
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9
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To TA, Mai BK, Nguyen TV. Toward Homogeneous Brønsted-Acid-Catalyzed Intramolecular Carbonyl-Olefin Metathesis Reactions. Org Lett 2022; 24:7237-7241. [PMID: 36166378 DOI: 10.1021/acs.orglett.2c03099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The carbonyl-olefin metathesis (COM) reaction is an attractive approach for the formation of a new carbon-carbon double bond from a carbonyl precursor. In principle, this reaction can be promoted by the activation of the carbonyl group with a Brønsted acid catalyst; however, it is often complicated as a result of unwanted side reactions under acidic conditions. Thus, there have been only a very few examples of Brønsted-acid-catalyzed COM reactions, all of which required specially designed setups. Herein, we report a new practical homogeneous Brønsted-acid-catalyzed protocol using nitromethane, a readily available solvent, to promote intramolecular ring-closing COM reactions.
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Affiliation(s)
- Tuong Anh To
- School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Binh Khanh Mai
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Thanh Vinh Nguyen
- School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia
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10
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Anh To T, Pei C, Koenigs RM, Vinh Nguyen T. Hydrogen Bonding Networks Enable Brønsted Acid-Catalyzed Carbonyl-Olefin Metathesis. Angew Chem Int Ed Engl 2022; 61:e202117366. [PMID: 34985790 PMCID: PMC9303705 DOI: 10.1002/anie.202117366] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Indexed: 12/18/2022]
Abstract
Synthetic chemists have learned to mimic nature in using hydrogen bonds and other weak interactions to dictate the spatial arrangement of reaction substrates and to stabilize transition states to enable highly efficient and selective reactions. The activation of a catalyst molecule itself by hydrogen‐bonding networks, in order to enhance its catalytic activity to achieve a desired reaction outcome, is less explored in organic synthesis, despite being a commonly found phenomenon in nature. Herein, we show our investigation into this underexplored area by studying the promotion of carbonyl‐olefin metathesis reactions by hydrogen‐bonding‐assisted Brønsted acid catalysis, using hexafluoroisopropanol (HFIP) solvent in combination with para‐toluenesulfonic acid (pTSA). Our experimental and computational mechanistic studies reveal not only an interesting role of HFIP solvent in assisting pTSA Brønsted acid catalyst, but also insightful knowledge about the current limitations of the carbonyl‐olefin metathesis reaction.
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Affiliation(s)
- Tuong Anh To
- School of Chemistry, University of New South Wales, Sydney Anzac Parade, Kensington, NSW, 2052, Australia
| | - Chao Pei
- Institute of Organic Chemistry, RWTH Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Rene M Koenigs
- Institute of Organic Chemistry, RWTH Aachen, Landoltweg 1, 52074, Aachen, Germany
| | - Thanh Vinh Nguyen
- School of Chemistry, University of New South Wales, Sydney Anzac Parade, Kensington, NSW, 2052, Australia
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11
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Hsu CP, Liu CA, Wen CC, Liu YH, Lin YF, Chiu CW. Chiral Bis(oxazoline) Ligand‐Supported Alkyl Aluminum Cations. ChemCatChem 2022. [DOI: 10.1002/cctc.202101715] [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]
Affiliation(s)
| | | | | | | | - Ya-Fan Lin
- Kaohsiung Medical University Fragrance and Cosmetic Science TAIWAN
| | - Ching-Wen Chiu
- National Taiwan University Department of Chemistry No. 1, Sec. 4, Roosevelt Rd. 10617 Taipei TAIWAN
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12
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Anh To T, Pei C, Koenigs RM, Vinh Nguyen T. Hydrogen Bonding Networks Enable Brønsted Acid‐Catalyzed Carbonyl‐Olefin Metathesis**. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117366] [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)
- Tuong Anh To
- School of Chemistry University of New South Wales, Sydney Anzac Parade Kensington NSW 2052 Australia
| | - Chao Pei
- Institute of Organic Chemistry RWTH Aachen Landoltweg 1 52074 Aachen Germany
| | - Rene M. Koenigs
- Institute of Organic Chemistry RWTH Aachen Landoltweg 1 52074 Aachen Germany
| | - Thanh Vinh Nguyen
- School of Chemistry University of New South Wales, Sydney Anzac Parade Kensington NSW 2052 Australia
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13
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Li Y, Sun Y, Meng L, Li Q, Zeng Y. Halogen Bond Catalysis on Carbonyl–Olefin
Ring‐Closing
Metathesis Reaction: Comparison with Lewis Acid Catalysis. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202100891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ying Li
- College of Chemistry and Materials Science, Hebei Key Laboratory of Inorganic Nano‐materials Hebei Normal University Shijiazhuang China 050024
| | - Yuanyuan Sun
- College of Chemistry and Materials Science, Hebei Key Laboratory of Inorganic Nano‐materials Hebei Normal University Shijiazhuang China 050024
| | - Lingpeng Meng
- College of Chemistry and Materials Science, Hebei Key Laboratory of Inorganic Nano‐materials Hebei Normal University Shijiazhuang China 050024
| | - Qingzhong Li
- The Laboratory of Theoretical and Computational Chemistry, College of Chemistry& Chemical Engineering Yantai University Yantai China 264005
| | - Yanli Zeng
- College of Chemistry and Materials Science, Hebei Key Laboratory of Inorganic Nano‐materials Hebei Normal University Shijiazhuang China 050024
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14
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Chen Y, Liu D, Wang R, Xu L, Tan J, Shu M, Tian L, Jin Y, Zhang X, Lin Z. Brønsted Acid-Catalyzed Carbonyl-Olefin Metathesis: Synthesis of Phenanthrenes via Phosphomolybdic Acid as a Catalyst. J Org Chem 2021; 87:351-362. [PMID: 34928599 DOI: 10.1021/acs.joc.1c02385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Compared with the impressive achievements of catalytic carbonyl-olefin metathesis (CCOM) mediated by Lewis acid catalysts, exploration of the CCOM through Brønsted acid-catalyzed approaches remains quite challenging. Herein, we disclose a synthetic protocol for the construction of a valuable polycycle scaffold through the CCOM with the inexpensive, nontoxic phosphomolybdic acid as a catalyst. The current annulations could realize carbonyl-olefin, carbonyl-alcohol, and acetal-alcohol in situ CCOM reactions and feature mild reaction conditions, simple manipulation, and scalability, making this strategy a promising alternative to the Lewis acid-catalyzed COM reaction.
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Affiliation(s)
- Yi Chen
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
| | - Di Liu
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
| | - Rui Wang
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China.,Chongqing Key Laboratory of Medicinal Chemistry & Molecular Pharmacology, Chongqing University of Technology, Chongqing 400054, China
| | - Li Xu
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
| | - Jingyao Tan
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
| | - Mao Shu
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
| | - Lingfeng Tian
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
| | - Yuan Jin
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
| | - Xiaoke Zhang
- Guizhou Provincial College-based Key Lab for Tumor Prevention and Treatment with Distinctive Medicines, Zunyi Medical University, Zunyi 563006, China
| | - Zhihua Lin
- School of Pharmacy & Bioengineering, Chongqing University of Technology, Chongqing 400054, China
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15
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Vayer M, Rodrigues S, Miaskiewicz S, Gatineau D, Gimbert Y, Gandon V, Bour C. Potassium Carbonate to Unlock a GaCl 3-Catalyzed C–H Propargylation of Arenes. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Marie Vayer
- Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), CNRS UMR 8182, Université Paris-Saclay, Bâtiment 420, 91405 Orsay CEDEX, France
| | - Sophie Rodrigues
- Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), CNRS UMR 8182, Université Paris-Saclay, Bâtiment 420, 91405 Orsay CEDEX, France
| | - Solène Miaskiewicz
- Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), CNRS UMR 8182, Université Paris-Saclay, Bâtiment 420, 91405 Orsay CEDEX, France
| | | | - Yves Gimbert
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, Paris 75005, France
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), CNRS UMR 8182, Université Paris-Saclay, Bâtiment 420, 91405 Orsay CEDEX, France
- Laboratoire de Chimie Moléculaire (LCM), CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, route de Saclay, 91128 Palaiseau CEDEX, France
| | - Christophe Bour
- Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), CNRS UMR 8182, Université Paris-Saclay, Bâtiment 420, 91405 Orsay CEDEX, France
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16
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Sebald MA, Gebauer J, Koch M. Diastereoselective synthesis of (±)-trichodiene and (±)-trichodiene-D 3 as analytical standards for the on-site quantification of trichothecenes. Org Biomol Chem 2021; 19:9872-9879. [PMID: 34734618 DOI: 10.1039/d1ob01778k] [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
The ubiquitous Fusarium genus is responsible for the spoilage of vast amounts of cereals and fruits. Besides the economic damage, the danger to human and animal health by the concomitant exposure to mycotoxins represents a serious problem. A large number of Fusarium species produce a variety of different mycotoxins of which the class of trichothecenes are of particular importance due to their toxicity. Being identified as the common volatile precursor during the biosynthesis of trichothecenes, (-)-trichodiene (TD) is considered to be a biomarker for the respective mycotoxin content in food samples. We postulated that the development of a non-invasive, on-site GC-IMS method for the quantification of (-)-trichodiene supplemented with a stationary SIDA headspace GC-MS reference method would allow circumventing the laborious and expensive analyses of individual trichothecenes in large cereal samples. In this work we present the syntheses of the required native calibration standard and an isotope labeled (TD-D3) internal standard.
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Affiliation(s)
- Michael A Sebald
- HPC Standards GmbH, Am Wieseneck 7, D-04451 Cunnersdorf, Germany.
| | - Julian Gebauer
- AnalytiCon Discovery GmbH, Hermannswerder Haus 17, D-14473 Potsdam, Germany
| | - Matthias Koch
- Bundesanstalt für Materialforschung und -prüfung, Abteilung Analytische Chemie, Referenzmaterialien, Richard-Willstätter-Strasse 11, D-12489 Berlin-Adlershof, Germany
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17
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Zheng H, Wang K, De Angelis L, Arman HD, Doyle MP. Brønsted Acid Catalyzed Oxocarbenium-Olefin Metathesis/Rearrangements of 1 H-Isochromene Acetals with Vinyl Diazo Compounds. J Am Chem Soc 2021; 143:15391-15399. [PMID: 34510888 DOI: 10.1021/jacs.1c07271] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An oxocarbenium-olefin cross metathesis occurs during Brønsted acid catalyzed reactions of 1H-isochromene acetals with vinyl diazo compounds. Formally a carbonyl-alkene [2 + 2]-cyclization between isobenzopyrylium ions and the vinyl group of vinyl diazoesters, the retro-[2 + 2] cycloaddition produces a tethered alkene and a vinyl diazonium ion that, upon loss of dinitrogen, undergoes a highly selective carbocationic cascade rearrangements to diverse products whose formation is controlled by reactant substituents. Polysubstituted benzobicyclo[3.3.1]oxocines, benzobicyclo[3.2.2]oxepines, benzobicyclopropane, and naphthalenes are obtained in good to excellent yields and selectivities. Furthermore, isotopic tracer and control experiments shed light on the oxocarbenium-olefin metathesis/rearrangement process as well as on the origin of the interesting substituent-dependent selectivity.
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Affiliation(s)
| | | | | | | | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
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18
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Albright H, Davis AJ, Gomez-Lopez JL, Vonesh HL, Quach PK, Lambert TH, Schindler CS. Carbonyl-Olefin Metathesis. Chem Rev 2021; 121:9359-9406. [PMID: 34133136 DOI: 10.1021/acs.chemrev.0c01096] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This Review describes the development of strategies for carbonyl-olefin metathesis reactions relying on stepwise, stoichiometric, or catalytic approaches. A comprehensive overview of currently available methods is provided starting with Paternò-Büchi cycloadditions between carbonyls and alkenes, followed by fragmentation of the resulting oxetanes, metal alkylidene-mediated strategies, [3 + 2]-cycloaddition approaches with strained hydrazines as organocatalysts, Lewis acid-mediated and Lewis acid-catalyzed strategies relying on the formation of intermediate oxetanes, and protocols based on initial carbon-carbon bond formation between carbonyls and alkenes and subsequent Grob-fragmentations. The Review concludes with an overview of applications of these currently available methods for carbonyl-olefin metathesis in complex molecule synthesis. Over the past eight years, the field of carbonyl-olefin metathesis has grown significantly and expanded from stoichiometric reaction protocols to efficient catalytic strategies for ring-closing, ring-opening, and cross carbonyl-olefin metathesis. The aim of this Review is to capture the status quo of the field and is expected to contribute to further advancements in carbonyl-olefin metathesis in the coming years.
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Affiliation(s)
- Haley Albright
- University of Michigan, Department of Chemistry, Willard Henry Dow Laboratory, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Ashlee J Davis
- University of Michigan, Department of Chemistry, Willard Henry Dow Laboratory, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jessica L Gomez-Lopez
- University of Michigan, Department of Chemistry, Willard Henry Dow Laboratory, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Hannah L Vonesh
- University of Michigan, Department of Chemistry, Willard Henry Dow Laboratory, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Phong K Quach
- Cornell University, Department of Chemistry and Chemical Biology, 253 East Avenue, Ithaca, New York 14850, United States
| | - Tristan H Lambert
- Cornell University, Department of Chemistry and Chemical Biology, 253 East Avenue, Ithaca, New York 14850, United States
| | - Corinna S Schindler
- University of Michigan, Department of Chemistry, Willard Henry Dow Laboratory, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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19
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Thorwart T, Roth D, Greb L. Bis(pertrifluoromethylcatecholato)silane: Extreme Lewis Acidity Broadens the Catalytic Portfolio of Silicon. Chemistry 2021; 27:10422-10427. [PMID: 33852170 PMCID: PMC8361710 DOI: 10.1002/chem.202101138] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Indexed: 11/10/2022]
Abstract
Given its earth abundance, silicon is ideal for constructing Lewis acids of use in catalysis or materials science. Neutral silanes were limited to moderate Lewis acidity, until halogenated catecholato ligands provoked a significant boost. However, catalytic applications of bis(perhalocatecholato)silanes were suffering from very poor solubility and unknown deactivation pathways. In this work, the novel per(trifluoromethyl)catechol, H2 catCF3 , and adducts of its silicon complex Si(catCF3 )2 (1) are described. According to the computed fluoride ion affinity, 1 ranks among the strongest neutral Lewis acids currently accessible in the condensed phase. The improved robustness and affinity of 1 enable deoxygenations of aldehydes, ketones, amides, or phosphine oxides, and a carbonyl-olefin metathesis. All those transformations have never been catalyzed by a neutral silane. Attempts to obtain donor-free 1 attest to the extreme Lewis acidity by stabilizing adducts with even the weakest donors, such as benzophenone or hexaethyl disiloxane.
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Affiliation(s)
- Thaddäus Thorwart
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Daniel Roth
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Lutz Greb
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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20
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Yang S, Bour C, Lebœuf D, Gandon V. DFT Analysis into the Calcium(II)-Catalyzed Coupling of Alcohols With Vinylboronic Acids: Cooperativity of Two Different Lewis Acids and Counterion Effects. J Org Chem 2021; 86:9134-9144. [PMID: 34152770 DOI: 10.1021/acs.joc.1c01263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The mechanism of the calcium-catalyzed coupling of alcohols with vinylboronic acids has been analyzed by means of density functional theory computations. This study reveals that the calcium and boron Lewis acids associate to form a superelectrophile able to promote a pericyclic group transfer reaction with allyl alcohols. With other alcohols, the two Lewis acids act synergistically to activate the OH functionality and trigger a SNi reaction pathway. These two mechanisms are affected by the nature of the counterions, which has been rationalized by electronic and steric factors.
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Affiliation(s)
- Shengwen Yang
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS UMR 8182, Université Paris-Sud, Université Paris-Saclay, Bâtiment 420, Orsay Cedex 91405, France.,Laboratoire de Chimie Moléculaire (LCM), CNRS UMR 9168, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay, Palaiseau Cedex 91128, France
| | - Christophe Bour
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS UMR 8182, Université Paris-Sud, Université Paris-Saclay, Bâtiment 420, Orsay Cedex 91405, France
| | - David Lebœuf
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS UMR 8182, Université Paris-Sud, Université Paris-Saclay, Bâtiment 420, Orsay Cedex 91405, France.,Institut de Science et d'Ingénierie Supramoléculaires (ISIS), CNRS UMR 7006, Université de Strasbourg, Strasbourg 67000, France
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS UMR 8182, Université Paris-Sud, Université Paris-Saclay, Bâtiment 420, Orsay Cedex 91405, France.,Laboratoire de Chimie Moléculaire (LCM), CNRS UMR 9168, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay, Palaiseau Cedex 91128, France
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