1
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Sharma A, Jamwal P, Vaid H, Gurubrahamam R. Synthesis of Alkynyl Hydrazones from Unprotected Hydrazine and Their Reactivity as Diazo Precursors. Org Lett 2023; 25:1889-1894. [PMID: 36897650 DOI: 10.1021/acs.orglett.3c00404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
Alkynyl hydrazones are synthesized conveniently from 2-oxo-3-butynoates and hydrazine by suppressing the susceptible formation of pyrazoles. The resultant hydrazones are transformed into alkynyl diazoacetates under metal-free and mild oxidative conditions in excellent yields. Further, the alkynyl cyclopropane and propargyl silane carboxylates are synthesized in good yields by developing an unprecedented copper-catalyzed alkynyl carbene transfer reaction.
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Affiliation(s)
- Akashdeep Sharma
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, PO Nagrota, Jagti, Jammu and Kashmir 181221, India
| | - Paru Jamwal
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, PO Nagrota, Jagti, Jammu and Kashmir 181221, India
| | - Himani Vaid
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, PO Nagrota, Jagti, Jammu and Kashmir 181221, India
| | - Ramani Gurubrahamam
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, PO Nagrota, Jagti, Jammu and Kashmir 181221, India
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2
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Li W, Zhou L. Synthesis of Tetrasubstituted Allenes via Visible-Light-Promoted Radical 1,3-Difunctionalization of Alkynyl Diazo Compounds. Org Lett 2022; 24:3976-3981. [PMID: 35622019 DOI: 10.1021/acs.orglett.2c01366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we described an unprecedented process for generating allenyl radicals through radical addition to alkynyl diazo compounds followed by a 1,2-radical shift with the loss of nitrogen. Using this protocol, radical 1,3-difunctionalization of alkynyl diazo compounds for the synthesis of tetrasubstituted allenes with RSO2X (X = SeR', SR', and I) as the radical sources was developed. The reactions were promoted by visible light without photocatalyst and any additives.
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Affiliation(s)
- Weiyu Li
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Lei Zhou
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China
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3
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Ning Y, Huo M, Wu L, Bi X. Silver-catalyzed cyclopropanation of alkenes with alkynyl N-nosylhydrazones leading to alkynyl cyclopropanes. Chem Commun (Camb) 2022; 58:3485-3488. [PMID: 35191450 DOI: 10.1039/d2cc00099g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Here, a novel method for the stereoselective synthesis of alkynyl cyclopropanes, by the silver-catalyzed alkynylcyclopropanation of alkenes using alkynyl N-nosylhydrazones as alkynyl carbene precursors, is reported. This method provides a straightforward and powerful approach for preparing various alkynyl cyclopropanes in high yield with excellent stereoselectivities. In addition, the practicality of this method was demonstrated by gram-scale synthesis and late-stage modification of bioactive molecules.
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Affiliation(s)
- Yongquan Ning
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China.
| | - Mengtian Huo
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China.
| | - Lizuo Wu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China.
| | - Xihe Bi
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China. .,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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4
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Ning Y, Song Q, Sivaguru P, Wu L, Anderson EA, Bi X. Ag-Catalyzed Insertion of Alkynyl Carbenes into C-C Bonds of β-Ketocarbonyls: A Formal C(sp 2) Insertion. Org Lett 2022; 24:631-636. [PMID: 34985288 DOI: 10.1021/acs.orglett.1c04081] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Here we report a silver-catalyzed alkynyl carbene insertion into β-ketocarbonyls using alkynyl N-nosylhydrazones as alkynyl carbene precursors, which provides access to trisubstituted allenyl ketones. This reaction represents the first example of an alkynyl carbene insertion into a C-C σ bond, affording products homologated with an sp2 carbon center. The products are useful substrates for further transformations. Experimental investigations and theoretical calculations suggest the reaction proceeds through a stepwise enol cyclopropanation/retro-aldol pathway.
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Affiliation(s)
- Yongquan Ning
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Qingmin Song
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Paramasivam Sivaguru
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Lizuo Wu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Edward A Anderson
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Xihe Bi
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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5
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Ali K, Prajapati G, Ampapathi RS, Panda G. Transition metal-free reductive coupling of allylic sulfonylhydrazones with aryl boronic acids for C(sp 3)–C(sp 2) bond formation. Org Biomol Chem 2022; 20:8672-8684. [DOI: 10.1039/d2ob01472f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The reductive coupling between allylic sulfonylhydrazones and aryl boronic acids gives 1,3-diarylpropene systems with good to excellent yields under very simple reaction conditions without metal catalysts and an inert atmosphere.
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Affiliation(s)
- Kasim Ali
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
- Academy of Scientific & Industrial Research (AcSIR), Ghaziabad, Uttar Pradesh-201002, India
| | - Gurudayal Prajapati
- NMR Centre, SAIF, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Ravi Sankar Ampapathi
- NMR Centre, SAIF, CSIR-Central Drug Research Institute, Lucknow 226031, India
- Academy of Scientific & Industrial Research (AcSIR), Ghaziabad, Uttar Pradesh-201002, India
| | - Gautam Panda
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
- Academy of Scientific & Industrial Research (AcSIR), Ghaziabad, Uttar Pradesh-201002, India
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6
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Zorba L, Egaña E, Gómez-Bengoa E, Vougioukalakis GC. Zinc Iodide Catalyzed Synthesis of Trisubstituted Allenes from Terminal Alkynes and Ketones. ACS OMEGA 2021; 6:23329-23346. [PMID: 34549133 PMCID: PMC8444324 DOI: 10.1021/acsomega.1c03092] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 07/13/2021] [Indexed: 05/03/2023]
Abstract
A straightforward, user-friendly, efficient protocol for the one pot, ZnI2-catalyzed allenylation of terminal alkynes with pyrrolidine and ketones, toward trisubstituted allenes, is described. Trisubstituted allenes can be obtained under either conventional heating or microwave irradiation conditions, which significantly reduces the reaction time. A sustainable, widely available, and low-cost metal salt catalyst is employed, and the reactions are carried out under solvent-free conditions. Among others, synthetically valuable allenes bearing functionalities such as amide, hydroxyl, or phthalimide can be efficiently prepared. Mechanistic experiments, including kinetic isotope effect measurements and density functional theory (DFT) calculations, suggest a rate-determining [1,5]-hydride transfer during the transformation of the intermediate propargylamine to the final allene.
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Affiliation(s)
- Leandros
P. Zorba
- Laboratory
of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771 Athens, Greece
| | - Eunate Egaña
- Department
of Organic Chemistry I, Faculty of Chemistry, University of the Basque Country UPV/EHU, 20018 Donostia-San Sebastián, Spain
| | - Enrique Gómez-Bengoa
- Department
of Organic Chemistry I, Faculty of Chemistry, University of the Basque Country UPV/EHU, 20018 Donostia-San Sebastián, Spain
| | - Georgios C. Vougioukalakis
- Laboratory
of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771 Athens, Greece
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7
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Wang Y, Wang H, Liu Z. Research Progress on EWG-Substituted N-Arylsulfonylhydrazones as the Diazo Compound Precursor. ACTA CHIMICA SINICA 2021. [DOI: 10.6023/a21040179] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Florentino L, López L, Barroso R, Cabal M, Valdés C. Synthesis of Pyrrolidines by a Csp
3
‐Csp
3
/Csp
3
‐
N
Transition‐Metal‐Free Domino Reaction of Boronic Acids with γ‐Azido‐
N
‐Tosylhydrazones. Angew Chem Int Ed Engl 2020; 60:1273-1280. [DOI: 10.1002/anie.202010528] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/29/2020] [Indexed: 12/20/2022]
Affiliation(s)
- Lucía Florentino
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Lucía López
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Raquel Barroso
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - María‐Paz Cabal
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Carlos Valdés
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
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9
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Florentino L, López L, Barroso R, Cabal M, Valdés C. Synthesis of Pyrrolidines by a Csp
3
‐Csp
3
/Csp
3
‐
N
Transition‐Metal‐Free Domino Reaction of Boronic Acids with γ‐Azido‐
N
‐Tosylhydrazones. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010528] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Lucía Florentino
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Lucía López
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Raquel Barroso
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - María‐Paz Cabal
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Carlos Valdés
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
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10
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Pei C, Yang Z, Koenigs RM. Synthesis of Trifluoromethylated Tetrasubstituted Allenes via Palladium-Catalyzed Carbene Transfer Reaction. Org Lett 2020; 22:7300-7304. [PMID: 32866017 DOI: 10.1021/acs.orglett.0c02638] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Herein, we report on the palladium-catalyzed synthesis of trifluoromethylated, tetrasubstituted allenes from vinyl bromides and trifluoromethylated diazoalkanes in good to excellent yield. This reaction proceeds via oxidative addition of a Pd(0) complex with vinyl bromide. Subsequent base-promoted reductive elimination generates the allene. This methodology provides an efficient strategy even on gram scale to valuable trifluoromethylated, tetrasubstituted allenes under mild reaction conditions. The allene products can be used in acid catalyzed cyclization reactions to give trifluoromethylated indene products.
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Affiliation(s)
- Chao Pei
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074 Aachen, Germany
| | - Zhen Yang
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074 Aachen, Germany
| | - Rene M Koenigs
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074 Aachen, Germany
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11
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Ning Y, Zhang X, Gai Y, Dong Y, Sivaguru P, Wang Y, Reddy BRP, Zanoni G, Bi X. Difluoroacetaldehyde
N
‐Triftosylhydrazone (DFHZ‐Tfs) as a Bench‐Stable Crystalline Diazo Surrogate for Diazoacetaldehyde and Difluorodiazoethane. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202000119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yongquan Ning
- Department of ChemistryNortheast Normal University Changchun 130024 China
| | - Xinyu Zhang
- Department of ChemistryNortheast Normal University Changchun 130024 China
| | - Yi Gai
- Department of ChemistryNortheast Normal University Changchun 130024 China
| | - Yuanqing Dong
- Department of ChemistryNortheast Normal University Changchun 130024 China
| | | | - Yingying Wang
- Department of ChemistryNortheast Normal University Changchun 130024 China
| | | | - Giuseppe Zanoni
- Department of ChemistryUniversity of Pavia Viale Taramelli 12 27100 Pavia Italy
| | - Xihe Bi
- Department of ChemistryNortheast Normal University Changchun 130024 China
- State Key Laboratory of Elemento-Organic ChemistryNankai University Tianjin 300071 China
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12
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Ning Y, Zhang X, Gai Y, Dong Y, Sivaguru P, Wang Y, Reddy BRP, Zanoni G, Bi X. Difluoroacetaldehyde N-Triftosylhydrazone (DFHZ-Tfs) as a Bench-Stable Crystalline Diazo Surrogate for Diazoacetaldehyde and Difluorodiazoethane. Angew Chem Int Ed Engl 2020; 59:6473-6481. [PMID: 31999022 DOI: 10.1002/anie.202000119] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Indexed: 12/26/2022]
Abstract
Despite the growing importance of volatile functionalized diazoalkanes in organic synthesis, their safe generation and utilization remain a formidable challenge because of their difficult handling along with storage and security issues. In this study, we developed a bench-stable difluoroacetaldehyde N-triftosylhydrazone (DFHZ-Tfs) as an operationally safe diazo surrogate that can release in situ two low-molecular-weight diazoalkanes, diazoacetaldehyde (CHOCHN2 ) or difluorodiazoethane (CF2 HCHN2 ), in a controlled fashion under specific conditions. DFHZ-Tfs has been successfully employed in the Fe-catalyzed cyclopropanation and Doyle-Kirmse reactions, thus highlighting the synthetic utility of DFHZ-Tfs in the efficient construction of molecule frameworks containing CHO or CF2 H groups. Moreover, the reaction mechanism for the generation of CHOCHN2 from CF2 HCHN2 was elucidated by density functional theory (DFT) calculations.
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Affiliation(s)
- Yongquan Ning
- Department of Chemistry, Northeast Normal University, Changchun, 130024, China
| | - Xinyu Zhang
- Department of Chemistry, Northeast Normal University, Changchun, 130024, China
| | - Yi Gai
- Department of Chemistry, Northeast Normal University, Changchun, 130024, China
| | - Yuanqing Dong
- Department of Chemistry, Northeast Normal University, Changchun, 130024, China
| | | | - Yingying Wang
- Department of Chemistry, Northeast Normal University, Changchun, 130024, China
| | | | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Xihe Bi
- Department of Chemistry, Northeast Normal University, Changchun, 130024, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
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13
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Wang H, Ning Y, Sun Y, Sivaguru P, Bi X. Cycloaddition of Trifluoroacetaldehyde N-Triftosylhydrazone (TFHZ-Tfs) with Alkynes for Synthesizing 3-Trifluoromethylpyrazoles. Org Lett 2020; 22:2012-2016. [DOI: 10.1021/acs.orglett.0c00395] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Hongwei Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yongquan Ning
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yue Sun
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Paramasivam Sivaguru
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xihe Bi
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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14
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Xiong Z, Zhang X, Li Y, Peng X, Fu J, Guo J, Xie F, Jiang C, Lin B, Liu Y, Cheng M. Syntheses of 12H-benzo[a]xanthen-12-ones and benzo[a]acridin-12(7H)-ones through Au(i)-catalyzed Michael addition/6-endo-trig cyclization/aromatization cascade annulation. Org Biomol Chem 2019; 16:7361-7374. [PMID: 30124720 DOI: 10.1039/c8ob01684d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A multifaceted gold(i)-catalyzed aromaticity-driven double 6-endo cascade cyclization strategy to synthesize both 12H-benzo[a]xanthen-12-ones and benzo[a]acridin-12(7H)-ones, whose core motifs xanthone and acridone both exist as important scaffolds in an immense number of bioactive compounds, was developed. The scopes of this strategy were examined by using a batch of synthetic 1,3-diphenylprop-2-yn-1-one substrates. To probe the mechanism of this cyclization a control experiment for synthesizing intermediates was performed. Thus, a putative mechanism was determined according to this experiment and previous studies.
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Affiliation(s)
- Zhiling Xiong
- Key Laboratory of Structure-Based Drug Design and Discovery (Shenyang Pharmaceutical University), Ministry of Education, Shenyang 110016, P. R. China.
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15
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Liu Z, Raveendra Babu K, Wang F, Yang Y, Bi X. Influence of sulfonyl substituents on the decomposition of N-sulfonylhydrazones at room temperature. Org Chem Front 2019. [DOI: 10.1039/c8qo00802g] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A systematic investigation on the influence of sulfonyl substituents on the decomposition of N-sulfonylhydrazones at room temperature is described.
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Affiliation(s)
- Zhaohong Liu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis
- Department of Chemistry
- Northeast Normal University
- 130024 Changchun
- China
| | - Kaki Raveendra Babu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis
- Department of Chemistry
- Northeast Normal University
- 130024 Changchun
- China
| | - Feng Wang
- School of Chemical Engineering
- Changchun University of Technology
- Changchun 130012
- China
| | - Yang Yang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis
- Department of Chemistry
- Northeast Normal University
- 130024 Changchun
- China
| | - Xihe Bi
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis
- Department of Chemistry
- Northeast Normal University
- 130024 Changchun
- China
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16
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Arunprasath D, Devi Bala B, Sekar G. Luxury of
N
‐Tosylhydrazones in Transition‐Metal‐Free Transformations. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801031] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dhanarajan Arunprasath
- Department of ChemistryIndian Institute of Technology Madras Chennai – 600036 Tamil Nadu India
| | | | - Govindasamy Sekar
- Department of ChemistryIndian Institute of Technology Madras Chennai – 600036 Tamil Nadu India
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17
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Wang D, de Wit MJM, Szabó KJ. Synthesis of Densely Substituted Conjugated Dienes by Transition-Metal-Free Reductive Coupling of Allenylboronic Acids and Tosylhydrazones. J Org Chem 2018; 83:8786-8792. [DOI: 10.1021/acs.joc.8b01104] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Dong Wang
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Martin J. M. de Wit
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Kálmán J. Szabó
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
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18
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Cheng H, Zhou X, Hu A, Ding S, Wang Y, Xiao Y, Zhang J. Thioether-functionalized trifluoromethyl-alkynes, 1,3-dienes and allenes: divergent synthesis from reaction of 2-trifluoromethyl-1,3-conjugated enynes with sulfur nucleophiles. RSC Adv 2018; 8:34088-34093. [PMID: 35548799 PMCID: PMC9086883 DOI: 10.1039/c8ra07834c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 09/27/2018] [Indexed: 12/23/2022] Open
Abstract
A divergent synthesis of thioether-functionalized trifluoromethyl-alkynes, 1,3-dienes and allenes via regioselective nucleophilic addition of sulfur nucleophiles to 2-trifluoromethyl-1,3-conjugated enynes was developed. The addition patterns depend on the type of enyne, sulfur nucleophile and reaction conditions used. 1,4-Addition leading to thioether-functionalized trifluoromethyl-allenes was realized when enynes possessing electron-withdrawing aryl groups on the alkyne moiety were used as reaction partners and alkanethiols were used as nucleophiles, whereas solvent-controlled construction of thioether-functionalized 1,3-dienes and alkynes was realized, respectively, via a 3,4-addition pattern or 1,2-addition pattern if thiophenols were applied as nucleophiles. The three types of compounds containing both sulfur and fluorine elements are valuable building blocks for synthesis of multifunctional fluorinated vinyl sulfides and thiophene derivatives. A divergent synthesis of thioether-functionalized trifluoromethyl-alkynes, 1,3-dienes and allenes viaregioselective nucleophilic addition of sulfur nucleophiles to 2-trifluoromethyl-1,3-conjugated enynes was developed.![]()
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Affiliation(s)
- Huayu Cheng
- Department of Chemistry
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai
- P. R. China
| | - Xiaofan Zhou
- Department of Chemistry
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai
- P. R. China
| | - Anjing Hu
- Department of Chemistry
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai
- P. R. China
| | - Shiteng Ding
- Department of Chemistry
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai
- P. R. China
| | - Yimo Wang
- No. 1 Middle School Affiliated to Central China Normal University
- Wuhan City
- P. R. China
| | - Yuanjing Xiao
- Department of Chemistry
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai
- P. R. China
| | - Junliang Zhang
- Department of Chemistry
- Fudan University
- Shanghai
- P. R. China
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Liu Z, Zhang X, Zanoni G, Bi X. Silver-Catalyzed Cyclopropanation of Alkenes Using N-Nosylhydrazones as Diazo Surrogates. Org Lett 2017; 19:6646-6649. [PMID: 29185774 DOI: 10.1021/acs.orglett.7b03374] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
An efficient silver-catalyzed [2 + 1] cyclopropanation of sterically hindered internal alkenes with diazo compounds in which room-temperature-decomposable N-nosylhydrazones are used as diazo surrogates is reported. The unexpected unique catalytic activity of silver was ascribed to its dual role as a Lewis acid activating alkene substrates and as a transition metal forming silver carbenoids. A wide range of internal alkenes, including challenging diarylethenes, were suitable for this protocol, thereby affording a variety of cyclopropanes with high efficiency in a stereoselective manner under mild conditions.
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Affiliation(s)
- Zhaohong Liu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University , Changchun 130024, China
| | - Xinyu Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University , Changchun 130024, China
| | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Xihe Bi
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University , Changchun 130024, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University , Tianjin 300071, China
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Affiliation(s)
- Aaron Wegener
- Department of Chemistry, Fort Lewis College, 1000 Rim Drive, Durango, Colorado 81301, United States
| | - Kenneth A. Miller
- Department of Chemistry, Fort Lewis College, 1000 Rim Drive, Durango, Colorado 81301, United States
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