1
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Jamwal P, Sharma A, Gurubrahamam R. Decomposition of Alkynyl Hydrazones: Synthesis of Allenoates, Dihaloallenoates, and Angularly Fused Tricyclic Azepines. Org Lett 2023; 25:6607-6612. [PMID: 37669229 DOI: 10.1021/acs.orglett.3c01994] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
An unprecedented decomposition of unprotected alkynyl hydrazones is attempted that has provided allenoates, tetrasubstituted α,γ-dihaloallenoates, and functionalized tricyclic azepines. A reaction of alkynyl hydrazones with N-halosuccinimides captures the electrophile in 2-fold that delivers fully substituted dibromo- and diiodoallenoates in good yields. In addition, a DABCO-promoted Wolff-Kishner reduction of hydrazones, followed by isomerization, provides versatile allenoates under mild conditions. In contrast, a similar decomposition with ambiphilic DBU furnishes a completely different tricyclic azepine scaffold in excellent yield and diastereoselectivity.
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Affiliation(s)
- Paru Jamwal
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, PO Nagrota, Jagti, Jammu, Jammu and Kashmir 181221, India
| | - Akashdeep Sharma
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, PO Nagrota, Jagti, Jammu, Jammu and Kashmir 181221, India
| | - Ramani Gurubrahamam
- Department of Chemistry, Indian Institute of Technology Jammu, NH-44, PO Nagrota, Jagti, Jammu, Jammu and Kashmir 181221, India
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2
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Borra S, Kim HY, Oh K. One-Pot Tandem Nickel-Catalyzed α-Vinyl Aldol Reaction and Cycloaddition Approach to [1,2,3]Triazolo[1,5- a]quinolines. Org Lett 2023; 25:288-292. [PMID: 36580377 DOI: 10.1021/acs.orglett.2c04188] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A one-pot tandem approach to [1,2,3]triazolo[1,5-a]quinolines was developed from (E)-β-chlorovinyl ketones and 2-azidoaryl carbonyls using a sequence of α-vinyl aldol and azide-alkyne cycloaddition reactions. In particular, the intramolecular azide-alkyne cycloaddition of allenol intermediates was readily promoted by a synergistic action of NEt3 and nickel catalysts. Given that the [1,2,3]triazolo[1,5-a]quinolines are useful synthetic precursors to α-diazoimines through ring-chain isomerization process, the subsequent denitrogenative transformations should provide ready access to valuable heterocyclic compounds.
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Affiliation(s)
- Satheesh Borra
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Hun Young Kim
- Department of Global Innovative Drugs, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
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3
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Borra S, Chae S, Kim HY, Oh K. Continuous Flow Synthesis of 1,4-Benzothiazines Using Ambivalent Reactivity of ( E)-β-Chlorovinyl Ketones: A Point of Reaction Control Enabled by Flow Chemistry. Org Lett 2022; 24:5287-5292. [PMID: 35848887 DOI: 10.1021/acs.orglett.2c01865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A continuous flow system to 1,4-benzothiazines was developed using the point of reaction control, where the ambivalent (E)-β-chlorovinyl ketones and 2,2'-dithiodianilines were confined in a diffusion controlled flow setting. The successful segregation of reactive chemical species in a flow setting allowed more defined reaction pathways that are not feasible in traditional batch reaction conditions. The point of reaction control in flow systems helps to execute the reactions often plagued with the concurrent generation of multiple chemical species.
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Affiliation(s)
- Satheesh Borra
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Soyeon Chae
- Department of Global Innovative Drugs, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Hun Young Kim
- Department of Global Innovative Drugs, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
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4
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Bhatt D, Chae S, Kim HY, Oh K. One-Pot Synthesis of N-Hydroxypyrroles via Soft α-Vinyl Enolization of ( E)-β-Chlorovinyl Ketones: A Traceless Arylsulfinate Mediator Strategy. Org Lett 2022; 24:2636-2640. [PMID: 35385289 DOI: 10.1021/acs.orglett.2c00649] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A traceless arylsulfinate mediator strategy has been developed to switch the reaction course of β-chlorovinyl ketones with N-hydroxyamine. The soft α-vinyl enolization of (E)-β-chlorovinyl ketones was conducted in the presence of sodium arylsulfinate to give transient alkenyl sulfones that in turn reacted with NH2OH to give novel access to N-hydroxypyrroles. The mechanistic studies revealed the initial formation of oxazine intermediates that rearranged to thermodynamically stable aromatic products, N-hydroxypyrroles, under microwave-assisted heating conditions.
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Affiliation(s)
- Divya Bhatt
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Soyeon Chae
- Department of Global Innovative Drugs, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Hun Young Kim
- Department of Global Innovative Drugs, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
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5
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Ritu, Kumar S, Chauhan P, Jain N. Photoredox halogenation of quinolones: the dual role of halo-fluorescein dyes. Org Biomol Chem 2021; 19:4585-4592. [PMID: 33955445 DOI: 10.1039/d1ob00538c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
An efficient C-3 halogenation of quinolin-4-ones is reported with halogenated fluorescein dyes which serve both as a halogen source and photocatalyst. This reaction shows broad substrate scope and gives good to excellent yields of C-3 brominated/iodinated quinolones with eosin Y/rose bengal in green light under ambient conditions. The mechanistic investigations suggest a radical pathway involving the oxidative dehalogenation of the dye in the presence of air.
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Affiliation(s)
- Ritu
- Department of Chemistry, Indian Institute of Technology, New Delhi-110016, India.
| | - Sharvan Kumar
- Department of Chemistry, Indian Institute of Technology, New Delhi-110016, India.
| | - Parul Chauhan
- Department of Chemistry, Indian Institute of Technology, New Delhi-110016, India.
| | - Nidhi Jain
- Department of Chemistry, Indian Institute of Technology, New Delhi-110016, India.
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6
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Xie Y, Yang X, Xu J, Chai H, Liu H, Zhang J, Song J, Gao Y, Jin Z, Chi YR. Access to Allene‐Containing Molecules via Enantioselective Reactions of Azolium Cumulenolate Intermediates. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102177] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yongtao Xie
- International Joint Research Center for Molecular Science College of Chemistry and Environmental Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Xing Yang
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Jun Xu
- College of Pharmacy Guizhou University of Traditional Chinese Medicine Guiyang 550025 China
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Huifang Chai
- College of Pharmacy Guizhou University of Traditional Chinese Medicine Guiyang 550025 China
| | - Hongxia Liu
- International Joint Research Center for Molecular Science College of Chemistry and Environmental Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China
| | - Junmin Zhang
- International Joint Research Center for Molecular Science College of Chemistry and Environmental Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China
| | - Jun Song
- International Joint Research Center for Molecular Science College of Chemistry and Environmental Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China
| | - Yuan Gao
- International Joint Research Center for Molecular Science College of Chemistry and Environmental Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China
| | - Zhichao Jin
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
| | - Yonggui Robin Chi
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
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7
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Xie Y, Yang X, Xu J, Chai H, Liu H, Zhang J, Song J, Gao Y, Jin Z, Chi YR. Access to Allene-Containing Molecules via Enantioselective Reactions of Azolium Cumulenolate Intermediates. Angew Chem Int Ed Engl 2021; 60:14817-14823. [PMID: 33834597 DOI: 10.1002/anie.202102177] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/29/2021] [Indexed: 12/17/2022]
Abstract
Azolium cumulenolates are a special type of intermediates in N-heterocyclic carbene catalysis. They contain elongated linear structures with three contiguous C=C bonds and sterically unhindered α-carbon atoms. These structural features make it difficult to develop enantioselective reactions for these intermediates. Here we disclose the first carbene-catalyzed highly enantioselective addition reactions of azolium cumulenolates. The reaction starts with alkynals as the precursors for azolium cumulenolate intermediates that undergo enantioselective addition to activated ketones. From the same set of substrates, both allene and spirooxindole products can be obtained with high yields and excellent enantioselectivities. The allene moieties in our optically enriched products carry rich reactivities and can be transformed to diverse molecules. The spirooxindole scaffolds in our products are important structural motifs in natural products and medicines.
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Affiliation(s)
- Yongtao Xie
- International Joint Research Center for Molecular Science, College of Chemistry and Environmental Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Xing Yang
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Jun Xu
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Huifang Chai
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China
| | - Hongxia Liu
- International Joint Research Center for Molecular Science, College of Chemistry and Environmental Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Junmin Zhang
- International Joint Research Center for Molecular Science, College of Chemistry and Environmental Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Jun Song
- International Joint Research Center for Molecular Science, College of Chemistry and Environmental Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yuan Gao
- International Joint Research Center for Molecular Science, College of Chemistry and Environmental Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Zhichao Jin
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University Huaxi District, Guiyang, 550025, China
| | - Yonggui Robin Chi
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University Huaxi District, Guiyang, 550025, China
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
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8
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Abozeid MA, Kim HY, Oh K. Divergent Halogenation Pathways of 2,2‐Dichlorobut‐3‐yn‐1‐ols to 3‐Chloro‐4‐Iodofurans and α‐Chloro‐γ‐Iodoallenes: Electrophilic versus Pd(II)‐Catalyzed Halogenation Strategies. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Mohamed Ahmed Abozeid
- Center for Metareceptome Research Graduate School of Pharmaceutical Sciences Chung-Ang University 84 Heukseok-ro, Dongjak Seoul 06974 Republic of Korea
| | - Hun Young Kim
- Department of Global Innovative Drugs Chung-Ang University 84 Heukseok-ro, Dongjak Seoul 06974 Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research Graduate School of Pharmaceutical Sciences Chung-Ang University 84 Heukseok-ro, Dongjak Seoul 06974 Republic of Korea
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9
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Sadhukhan S, Santhi J, Baire B. The α,α‐Dihalocarbonyl Building Blocks: An Avenue for New Reaction Development in Organic Synthesis. Chemistry 2020; 26:7145-7175. [DOI: 10.1002/chem.201905475] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/08/2020] [Indexed: 01/04/2023]
Affiliation(s)
- Santu Sadhukhan
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Jampani Santhi
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Beeraiah Baire
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
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10
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Zhang Y, Zhang J, Yuan Y, Liu L, Chen B, Sun T. Synthesis of Polysubstituted 2 H
-Pyran-2-ones or Phenols via One-Pot Reaction of ( E
)- β
-Chlorovinyl Ketones and Electron-Withdrawing Group Substituted Acetates or β
-Diketones. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Youchi Zhang
- School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 122 Luoshi Road 430070 Wuhan China
| | - Jingli Zhang
- School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 122 Luoshi Road 430070 Wuhan China
| | - Ye Yuan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Chemical Engineering and Life Science; Wuhan University of Technology; 122 Luoshi Road 430070 Wuhan China
| | - Liran Liu
- School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 122 Luoshi Road 430070 Wuhan China
| | - Bifeng Chen
- School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 122 Luoshi Road 430070 Wuhan China
| | - Taolei Sun
- School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 122 Luoshi Road 430070 Wuhan China
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11
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Kim HY, Oh K. Divergent Reaction Pathways of β‐Chlorovinyl Ketones: Microwave‐Assisted Thermal Nazarov Cyclization versus Cycloisomerization via Soft Vinyl Enolization. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901399] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hun Young Kim
- Center for Metareceptome Research, Graduate School of Pharmaceutical SciencesChung-Ang University 84 Heukseok-ro, Dongjak Seoul 06974 Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, Graduate School of Pharmaceutical SciencesChung-Ang University 84 Heukseok-ro, Dongjak Seoul 06974 Republic of Korea
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12
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Koo H, Kim HY, Oh K. Continuous Flow Synthesis of Isoxazoles via Vinyl Azides from Friedel–Crafts Acylation of Alkynes: A Modulated Troubleshooting Optimization Approach. Org Lett 2019; 21:10063-10068. [DOI: 10.1021/acs.orglett.9b04010] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Hyungmo Koo
- Center for Metareceptome Research, College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Hun Young Kim
- Center for Metareceptome Research, College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
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13
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da Silva VAF, da Silva GP, Matsuo BT, Ali A, Davis RL, Zukerman-Schpector J, Corrêa AG, Paixão MW. Synthesis of (Z)-β-halo α,β-unsaturated carbonyl systems via the combination of halotrimethylsilane and tetrafluoroboric acid. Org Biomol Chem 2019; 17:519-526. [PMID: 30569046 DOI: 10.1039/c8ob02110d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A convenient and broadly applicable method for the hydrohalogenation of ynones is described, by the combination of halotrimethylsilanes and tetrafluoroboric acid. Practically, one equivalent of HX (Brønsted acid) and BF3 (Lewis acid) is smoothly generated, which activates the carbonyl compounds. Through this protocol, 42 examples of (Z)-β-halovinyl carbonyl compounds (Cl, Br and I) were obtained, in good yields and high stereoselectivity having 2-MeTHF as a solvent.
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Affiliation(s)
- Vitor A F da Silva
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem), Department of Chemistry, Federal University of São Carlos - UFSCar, São Carlos, São Paulo, Brazil.
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14
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Kim HY, Oh K. Tandem Transformations via Friedel-Crafts Acylation Followed by a Ring-Expansion, Ring-Opening, and Cycloisomerization Sequence. Org Lett 2019; 21:696-699. [PMID: 30673258 DOI: 10.1021/acs.orglett.8b03881] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A tandem synthetic route to a diverse array of cyclic compounds has been developed from Friedel-Crafts acylation of alkynes followed by the microwave irradiation of β-chlorovinyl ketone intermediates. The stereoisomeric β-chlorovinyl ketone intermediates smoothly underwent a thermal α-vinyl enolization and ring expansion to vinyl and carbocyclic furans as well as cyclopetene derivatives in good to excellent yields without the need for any catalysts.
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Affiliation(s)
- Hun Young Kim
- Center for Metareceptome Research, College of Pharmacy , Chung-Ang University , 84 Heukseok-ro , Dongjak, Seoul 06974 , Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, College of Pharmacy , Chung-Ang University , 84 Heukseok-ro , Dongjak, Seoul 06974 , Republic of Korea
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15
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Koo H, Kim HY, Oh K. (E)-Selective Friedel–Crafts acylation of alkynes to β-chlorovinyl ketones: defying isomerizations in batch reactions by flow chemistry approaches. Org Chem Front 2019. [DOI: 10.1039/c9qo00217k] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Flow chemistry approaches provide a fast, clean, and stereoselective synthetic route to (E)-β-chlorovinyl ketones, free from inherent (E) → (Z) isomerization.
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Affiliation(s)
- Hyungmo Koo
- Center for Metareceptome Research
- College of Pharmacy
- Chung-Ang University
- Seoul 06974
- Republic of Korea
| | - Hun Young Kim
- Center for Metareceptome Research
- College of Pharmacy
- Chung-Ang University
- Seoul 06974
- Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research
- College of Pharmacy
- Chung-Ang University
- Seoul 06974
- Republic of Korea
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16
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Kim HY, Oh K. A One-Pot Synthesis of Pyranone and Pyrrole Derivatives from β-Chlorovinyl Ketones via Direct Conjugate Addition Approach. Org Lett 2017; 19:4904-4907. [PMID: 28862862 DOI: 10.1021/acs.orglett.7b02381] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The direct conjugate addition reactions of imino esters to β-chlorovinyl ketones have been accomplished in the presence of a substoichiometric amount of hard base, LiHMDS. An in situ generated species from the conjugate addition reaction readily acted as autocatalyst to convert the imino esters to its corresponding enolates. By utilizing a sequence of conjugate addition/elimination/lactonization followed by either reduction or reaction with amines, the novel one-pot syntheses of highly functionalized pyranone and pyrrole derivatives were accomplished in good to excellent yields.
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Affiliation(s)
- Hun Young Kim
- Center for Metareceptome Research, College of Pharmacy, Chung-Ang University , 84 Heukseok-ro, Dongjak, Seoul 06974, Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, College of Pharmacy, Chung-Ang University , 84 Heukseok-ro, Dongjak, Seoul 06974, Korea
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17
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Bakshi D, Singh A. Direct Csp2–H enolization: an allenoate alkylation cascade toward the assembly of multi-substituted furans. Org Biomol Chem 2017; 15:3175-3178. [DOI: 10.1039/c7ob00248c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new route toward tri- and tetrasubstituted furans has been realized via an allenoate alkylation pathway that employs the allenic moiety as a two-carbon unit in the construction of a furan scaffold.
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Affiliation(s)
- Debanjan Bakshi
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
| | - Anand Singh
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
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18
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Song E, Kim HY, Oh K. A facile synthesis of 3,4-dimercaptofurans via sulfenylation of (E)-β-chlorovinyl ketones and 1,2-sulfur migration. Org Biomol Chem 2017; 15:1776-1779. [DOI: 10.1039/c6ob02772e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile access to 3,4-dimercaptofurans was developed by the sulfenylation of β-chlorovinyl ketones followed by a novel 1,2-sulfur migration.
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Affiliation(s)
- E. Song
- Center for Metareceptome Research
- College of Pharmacy
- Chung-Ang University
- Seoul 06974
- Republic of Korea
| | - H. Y. Kim
- Center for Metareceptome Research
- College of Pharmacy
- Chung-Ang University
- Seoul 06974
- Republic of Korea
| | - K. Oh
- Center for Metareceptome Research
- College of Pharmacy
- Chung-Ang University
- Seoul 06974
- Republic of Korea
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19
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Kim HY, Song E, Oh K. Unified Approach to (Thio)chromenones via One-Pot Friedel–Crafts Acylation/Cyclization: Distinctive Mechanistic Pathways of β-Chlorovinyl Ketones. Org Lett 2016; 19:312-315. [DOI: 10.1021/acs.orglett.6b03348] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hun Young Kim
- Center for Metareceptome
Research, College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Eunsun Song
- Center for Metareceptome
Research, College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome
Research, College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
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20
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Martzel T, Lohier JF, Gaumont AC, Brière JF, Perrio S. Unique Reactivity of α-Substituted Electron-Deficient Allenes using Sulfinate Salts as Lewis Base Organocatalysts. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600929] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Thomas Martzel
- Normandie Univ; ENSICAEN, UNICAEN, CNRS, LCMT; 14000 Caen France
| | | | | | - Jean-François Brière
- Normandie Univ; INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Stéphane Perrio
- Normandie Univ; ENSICAEN, UNICAEN, CNRS, LCMT; 14000 Caen France
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21
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Feng L, Yan H, Yang C, Chen D, Xia W. Visible-Light Induced Direct Synthesis of Polysubstituted Furans from Cyclopropyl Ketones. J Org Chem 2016; 81:7008-22. [PMID: 27167091 DOI: 10.1021/acs.joc.6b00436] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this article, a photoredox protocol for the synthesis of furans via oxidative coupling of olefin generated in situ from cyclopropyl ketones with ketonic oxygen atom is presented. Moreover, bromination of furans in the presence of overstoichiometric oxidant has been achieved with high regioselectivity.
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Affiliation(s)
- Liyan Feng
- State Key Lab of Urban Water Resource and Environment, Shenzhen Graduate School, Harbin Institute of Technology , Harbin 150080 China
| | - Hang Yan
- State Key Lab of Urban Water Resource and Environment, Shenzhen Graduate School, Harbin Institute of Technology , Harbin 150080 China
| | - Chao Yang
- State Key Lab of Urban Water Resource and Environment, Shenzhen Graduate School, Harbin Institute of Technology , Harbin 150080 China
| | - Dafa Chen
- State Key Lab of Urban Water Resource and Environment, Shenzhen Graduate School, Harbin Institute of Technology , Harbin 150080 China
| | - Wujiong Xia
- State Key Lab of Urban Water Resource and Environment, Shenzhen Graduate School, Harbin Institute of Technology , Harbin 150080 China
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22
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Shu C, Li L, Shen CH, Ruan PP, Liu CY, Ye LW. Gold-Catalyzed Tandem Cycloisomerization-Halogenation of Chiral Homopropargyl Sulfonamides. Chemistry 2016; 22:2282-90. [DOI: 10.1002/chem.201503891] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Indexed: 12/28/2022]
Affiliation(s)
- Chao Shu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and The Key Laboratory for Chemical Biology of Fujian Province; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 Fujian P. R. China
| | - Long Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces and The Key Laboratory for Chemical Biology of Fujian Province; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 Fujian P. R. China
| | - Cang-Hai Shen
- State Key Laboratory of Physical Chemistry of Solid Surfaces and The Key Laboratory for Chemical Biology of Fujian Province; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 Fujian P. R. China
| | - Peng-Peng Ruan
- State Key Laboratory of Physical Chemistry of Solid Surfaces and The Key Laboratory for Chemical Biology of Fujian Province; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 Fujian P. R. China
| | - Chao-Yue Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and The Key Laboratory for Chemical Biology of Fujian Province; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 Fujian P. R. China
| | - Long-Wu Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces and The Key Laboratory for Chemical Biology of Fujian Province; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 Fujian P. R. China
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; Shanghai 200032 P. R. China
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23
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Kim HY, Oh K. 1,3-Dienones and 2H-Pyran-2-ones from Soft α-Vinyl Enolization of β-Chlorovinyl Ketones: Defined Roles of Brönsted and Lewis Base. Org Lett 2015; 17:6254-7. [PMID: 26649772 DOI: 10.1021/acs.orglett.5b03265] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The eliminative reaction pathways of (E)-β-chlorovinyl ketones were investigated in the presence of both Brönsted and Lewis bases. The Brönsted base, Et3N, effected the soft α-vinyl enolization of (E)-β-chlorovinyl ketones to [3]cumulenol intermediates; in turn, a catalytic amount of Lewis base, PPh3, initiated isomerization to provide 1,3-dienones in high yields. The introduction of a carbon-based nucleophile into the reaction mixture provided the highly efficient synthetic route to 2H-pyran-2-ones in one pot, where the carbon-based nucleophile generated by an extra equivalent of Brönsted base, Et3N, attacked the electrophilic [3]cumulenol intermediates to initiate cyclization to give 2H-pyran-2-ones.
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Affiliation(s)
- Hun Young Kim
- Center for Metareceptome Research, College of Pharmacy, Chung-Ang University , 84 Heukseok-ro, Dongjak, Seoul 156-756, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, College of Pharmacy, Chung-Ang University , 84 Heukseok-ro, Dongjak, Seoul 156-756, Republic of Korea
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