1
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Zhao X, Wang G, Hashmi ASK. Gold catalysis in quinoline synthesis. Chem Commun (Camb) 2024; 60:6999-7016. [PMID: 38904196 DOI: 10.1039/d4cc01915f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Quinolines are biologically and pharmaceutically important N-heterocyclic aromatic compounds, which have broad applications in medicinal chemistry. Thus, their efficient synthesis has attracted extensive attention, and a broad range of synthetic strategies have been established. Of note, gold-catalyzed methodologies for the synthesis of quinolines have greatly advanced this field. Various gold-catalyzed intermolecular annulation reactions, such as annulations of aniline derivatives with carbonyl compounds or alkynes, annulations of anthranils with alkynes, and annulations based on A3-coupling reactions, as well as intramolecular cyclization reactions of azide-tethered alkynes, 1,2-diphenylethynes, and 2-ethynyl N-aryl indoles, have been developed. This review provides an overview of this exciting research area. Typical achievements in reaction methodologies and plausible reaction mechanisms are summarized.
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Affiliation(s)
- Ximei Zhao
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Guanghui Wang
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - A Stephen K Hashmi
- Organisch-Chemisches Institut, Heidelberg University, Heidelberg 69120, Germany.
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2
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Li S, Liu W, Xia XF. Silver-catalyzed nitrosation and nitration of aromatic amides using NOBF 4. Org Biomol Chem 2023; 21:9428-9432. [PMID: 37990946 DOI: 10.1039/d3ob01729j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Divergent aromatic ring nitrosation and nitration of aromatic amides are reported using NOBF4 as the electrophile under silver-catalyzed conditions. The reactions proceed efficiently with a wide range of compatible functionalities providing ortho-position nitrosation products, deacylation nitrosation products, and nitration products from different tertiary and secondary aromatic amides.
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Affiliation(s)
- Sa Li
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu, 214122, China.
| | - Wentao Liu
- Industry and Information Technology Development Center of Yinan County, Linyi, Shandong, 276300, China
| | - Xiao-Feng Xia
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu, 214122, China.
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3
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Sadaphal VA, Liu RS. Reactions of 1,3-Diphenyl Cyclopentadiene with α-Aryldiazo Ketones to Enable C-H Insertions versus [4 + 2]-Cycloadditions via Au Catalyst and P(C 6F 5) 3 Additive, Respectively. J Org Chem 2023; 88:14899-14910. [PMID: 37857361 DOI: 10.1021/acs.joc.3c01190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
Two distinct reaction chemoselectivities were reported for the reactions of α-aryldiazo ketone with 1,3-diphenylcyclopentadiene using gold catalyst and phosphine additives, respectively. In the presence of gold catalyst, α-aryldiazo ketone forms gold carbenes initially that are trapped with this 1,3-disubstituted cyclopentadiene to afford C-H insertion products. In the presence of P(C6F5)3 additive, α-aryldiazo ketone forms diarylketenes initially at elevated temperature, which are further stabilized by P(C6F5)3 to secure their entity before proceeding to unprecedented [4C + 2C] cycloadditions.
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Affiliation(s)
- Vikas Ashokrao Sadaphal
- Frontier Research Center on Fundamental and Applied Science of Matters, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
| | - Rai-Shung Liu
- Frontier Research Center on Fundamental and Applied Science of Matters, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
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4
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Jiménez-Aberásturi X, Palacios F, de Los Santos JM. Sc(OTf) 3-Mediated [4 + 2] Annulations of N-Carbonyl Aryldiazenes with Cyclopentadiene to Construct Cinnoline Derivatives: Azo-Povarov Reaction. J Org Chem 2022; 87:11583-11592. [PMID: 35972474 PMCID: PMC9447289 DOI: 10.1021/acs.joc.2c01224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We disclose the first accomplishment of the azo-Povarov reaction involving Sc(OTf)3-catalyzed [4 + 2] annulations of N-carbonyl aryldiazenes with cyclopentadiene in chloroform, in which N-carbonyl aryldiazenes act as 4π-electron donors. Hence, this protocol offers a rapid access to an array of cinnoline derivatives in moderate to good yields for substrates over a wide scope. The synthetic potential of the protocol was achieved by the gram-scale reaction and further derivatization of the obtained polycyclic product.
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Affiliation(s)
- Xabier Jiménez-Aberásturi
- Department of Organic Chemistry I, Faculty of Pharmacy and Lascaray Research Center, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, Vitoria 01006, Spain
| | - Francisco Palacios
- Department of Organic Chemistry I, Faculty of Pharmacy and Lascaray Research Center, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, Vitoria 01006, Spain
| | - Jesús M de Los Santos
- Department of Organic Chemistry I, Faculty of Pharmacy and Lascaray Research Center, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, Vitoria 01006, Spain
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5
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Bernardo O, González J, Borge J, López LA. Gold-Catalyzed Regioselective Synthesis of Crowded Cyclopentadienes by Migratory Cycloisomerization of Vinylallenes. Org Lett 2022; 24:5203-5208. [PMID: 35819017 PMCID: PMC9490818 DOI: 10.1021/acs.orglett.2c02035] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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We report the regioselective synthesis of silyl-substituted
cyclopentadienyl
esters through gold-catalyzed migratory cycloisomerization of silyl-substituted
vinylallenes. This transformation is proposed to proceed through a
perfectly orchestrated sequence of events including Nazarov-like cyclization
and several silyl and hydrogen rearrangements. Furthermore, exploiting
the multifaceted nature of the gold catalyst, we have also identified
suitable conditions for the synthesis of these cyclopentadienes in
a more straightforward manner through gold-catalyzed reaction of propargyl
esters and alkynylsilanes.
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Affiliation(s)
- Olaya Bernardo
- Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica "Enrique Moles" and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
| | - Javier González
- Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
| | - Javier Borge
- Departamento de Química Física y Analítica, Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
| | - Luis A López
- Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica "Enrique Moles" and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
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6
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Sasane AV, Kuo TC, Cheng MJ, Liu RS. Gold-Catalyzed Rearrangement of α-Carbonyl Cyclopropanes to Form 3-(Cyclopenta-1,3-dien-1-ylmethyl)oxindoles via a Postulated 1,5-Enolate Shift. Org Lett 2022; 24:5220-5225. [PMID: 35816021 DOI: 10.1021/acs.orglett.2c02117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Gold-catalyzed stereoselective synthesis of spirocyclopropyl oxindoles from diazooxindoles and 1,2,4-substituted dienes is described. The aim of this work is to report a novel rearrangement of these spirocyclopropyl oxindoles with a gold catalyst to yield 3-(cyclopenta-1,3-dien-1-ylmethyl)oxindoles. Our experimental data exclude a reversible process in the gold-catalyzed cyclopropanation. With DFT calculations, we postulate a rearrangement mechanism involving the formation of complex pairs of gold enolates and 1-methylen-2,3,4-cyclopentadienyl cations, leading to a 1,5-enolate shift.
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Affiliation(s)
- Amit Vijay Sasane
- Frontier Center for Material Science and Technology and Department of Chemistry, National Tsing-Hua University, Hsinchu 30013, Taiwan, R.O.C
| | - Tung-Chun Kuo
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan, R.O.C
| | - Mu-Jeng Cheng
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan, R.O.C
| | - Rai-Shung Liu
- Frontier Center for Material Science and Technology and Department of Chemistry, National Tsing-Hua University, Hsinchu 30013, Taiwan, R.O.C
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7
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Yu L, Li W, Tapdara A, Kyne SH, Harode M, Babaahmadi R, Ariafard A, Chan PWH. Chiral Gold Complex Catalyzed Cycloisomerization/Regio- and Enantioselective Nitroso-Diels–Alder Reaction of 1,6-Diyne Esters with Nitrosobenzenes. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Lei Yu
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Wenhai Li
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
- Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, China
| | - Anyawan Tapdara
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Sara Helen Kyne
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Mandeep Harode
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Rasool Babaahmadi
- School of Natural Sciences−Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Alireza Ariafard
- School of Natural Sciences−Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia
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8
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Barik D, Liu RS. Gold(I)-Catalyzed [4 + 2] Annulation between Arylynes and C,N-Diaryl Nitrones for Chemoselective Synthesis of Quinoline Scaffolds via Gold Acetylide Intermediates. J Org Chem 2022; 87:7097-7105. [DOI: 10.1021/acs.joc.2c00274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Debashis Barik
- Frontier Research Center on Fundamental and Applied Science of Matters, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
| | - Rai-Shung Liu
- Frontier Research Center on Fundamental and Applied Science of Matters, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
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9
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Segura-Quezada LA, Torres-Carbajal KR, Mali N, Patil DB, Luna-Chagolla M, Ortiz-Alvarado R, Tapia-Juárez M, Fraire-Soto I, Araujo-Huitrado JG, Granados-López AJ, Gutiérrez-Hernández R, Reyes-Estrada CA, López-Hernández Y, López JA, Chacón-García L, Solorio-Alvarado CR. Gold(I)-Catalyzed Synthesis of 4 H-Benzo[ d][1,3]oxazines and Biological Evaluation of Activity in Breast Cancer Cells. ACS OMEGA 2022; 7:6944-6955. [PMID: 35252686 PMCID: PMC8892638 DOI: 10.1021/acsomega.1c06637] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
The first gold(I)-catalyzed cycloisomerization procedure applied to the synthesis of substituted 4H-benzo[d][1,3]oxazines has been developed starting from N-(2-alkynyl)aryl benzamides. The chemoselective oxygen cyclization via the 6-exo-dig pathway yielded the observed heterocycles in modest to good chemical yields under very mild reaction conditions. The obtained oxazines were assayed on the breast cancer (BC)-derived cell lines MCF-7 and HCC1954 with differential biological activity. The newly synthesized 4H-benzo[d][1,3]oxazine compounds showed several degrees of cell proliferation inhibition with a remarkable effect for those compounds having a substituted aryl at C-2 of the molecules. The 4H-benzo[d][1,3]oxazines showed an IC50 ranking from 3.1 to 95 μM in MCF-7 and HCC1954 cells. These compounds represent potential drug candidates for BC treatment. However, additional assays are needed to elucidate their complete effect over the cellular and molecular hallmarks of cancer.
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Affiliation(s)
- Luis A. Segura-Quezada
- División
de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Campus Guanajuato, Noria Alta S/N, 36050 Guanajuato, Guanajuato, Mexico
| | - Karina R. Torres-Carbajal
- División
de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Campus Guanajuato, Noria Alta S/N, 36050 Guanajuato, Guanajuato, Mexico
| | - Narendra Mali
- División
de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Campus Guanajuato, Noria Alta S/N, 36050 Guanajuato, Guanajuato, Mexico
| | - Dipak B. Patil
- División
de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Campus Guanajuato, Noria Alta S/N, 36050 Guanajuato, Guanajuato, Mexico
| | - Mauricio Luna-Chagolla
- División
de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Campus Guanajuato, Noria Alta S/N, 36050 Guanajuato, Guanajuato, Mexico
| | - Rafael Ortiz-Alvarado
- Instituto
de Ciencias Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Av. Universidad S/N, 58000 Morelia, Michoacán, Mexico
| | - Melissa Tapia-Juárez
- Laboratorio
de Diseño Molecular, Instituto de Investigaciones Químico
Biológicas, Universidad Michoacana
de San Nicolás de Hidalgo, Ciudad Universitaria, 58033 Morelia, Michoacán, Mexico
| | - Ixamail Fraire-Soto
- MicroRNAs
and Cancer Laboratory, Universidad Autónoma
de Zacatecas, Av. Preparatoria S/N, Agronómica, Campus II, 98066 Zacatecas, Zacatecas, Mexico
| | - Jorge Gustavo Araujo-Huitrado
- MicroRNAs
and Cancer Laboratory, Universidad Autónoma
de Zacatecas, Av. Preparatoria S/N, Agronómica, Campus II, 98066 Zacatecas, Zacatecas, Mexico
| | - Angelica Judith Granados-López
- MicroRNAs
and Cancer Laboratory, Universidad Autónoma
de Zacatecas, Av. Preparatoria S/N, Agronómica, Campus II, 98066 Zacatecas, Zacatecas, Mexico
| | - Rosalinda Gutiérrez-Hernández
- MicroRNAs
and Cancer Laboratory, Universidad Autónoma
de Zacatecas, Av. Preparatoria S/N, Agronómica, Campus II, 98066 Zacatecas, Zacatecas, Mexico
| | - Claudia Araceli Reyes-Estrada
- MicroRNAs
and Cancer Laboratory, Universidad Autónoma
de Zacatecas, Av. Preparatoria S/N, Agronómica, Campus II, 98066 Zacatecas, Zacatecas, Mexico
| | - Yamilé López-Hernández
- MicroRNAs
and Cancer Laboratory, Universidad Autónoma
de Zacatecas, Av. Preparatoria S/N, Agronómica, Campus II, 98066 Zacatecas, Zacatecas, Mexico
| | - Jesús Adrián López
- MicroRNAs
and Cancer Laboratory, Universidad Autónoma
de Zacatecas, Av. Preparatoria S/N, Agronómica, Campus II, 98066 Zacatecas, Zacatecas, Mexico
| | - Luis Chacón-García
- Laboratorio
de Diseño Molecular, Instituto de Investigaciones Químico
Biológicas, Universidad Michoacana
de San Nicolás de Hidalgo, Ciudad Universitaria, 58033 Morelia, Michoacán, Mexico
| | - César R. Solorio-Alvarado
- División
de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Campus Guanajuato, Noria Alta S/N, 36050 Guanajuato, Guanajuato, Mexico
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10
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Clerigué J, Ramos MT, Menéndez JC. Enantioselective catalytic Povarov reactions. Org Biomol Chem 2022; 20:1550-1581. [PMID: 34994760 DOI: 10.1039/d1ob02270a] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic asymmetric Povarov protocols have undergone an explosive growth, especially in the last ten years, since the first example was published in 1996. The use of chiral Lewis and Brønsted acids and dual strategies based on their combination with catalysts acting by hydrogen bond formation, as well as covalent aminocatalysis, are reviewed. More recent variations such as the nitroso Povarov reaction and interrupted Povarov reactions as a route to chiral scaffolds other than tetrahydroquinolines are also discussed.
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Affiliation(s)
- José Clerigué
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas. Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain.
| | - M Teresa Ramos
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas. Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain.
| | - J Carlos Menéndez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas. Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain.
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11
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Baidya M, Ghosh P, Mondal SL. Ascending of Cycloaddition Strategy for N–O Heterocycles. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1703-6448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractThe N–O heterocycles are biologically relevant scaffolds and versatile building blocks in contemporary organic synthesis. In this short review, we showcase the involvement and elevation of various cycloaddition strategies towards the production of the N–O heterocycles; 1,2-oxazines and 1,2-oxazinanes, 1,2-oxazepanes, and 1,2-oxazetidines. An overview of the advantages and challenges associated with these synthetic endeavors is provided.1 Introduction2 Six-Membered N–O Heterocycles (1,2-Oxazines and 1,2-Oxazinanes)3 Seven-Membered N–O Heterocycles (1,2-Oxazepanes)4 Four-Membered N–O Heterocycles (1,2-Oxazetidines)5 Summary and Outlook
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12
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Tanpure SD, Kuo TC, Cheng MJ, Liu RS. Gold(I)-Catalyzed Highly Diastereo- and Enantioselective Constructions of Bicyclo[3.2.1]oct-6-ene Frameworks via (4 + 3)-Cycloadditions. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04483] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Sudhakar Dattatray Tanpure
- Frontier Research Center for Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu 300, Taiwan, ROC
| | - Tung-Chun Kuo
- Department of Chemistry, National Cheng Kung University, East District, Tainan City 701, Taiwan, ROC
| | - Mu-Jeng Cheng
- Department of Chemistry, National Cheng Kung University, East District, Tainan City 701, Taiwan, ROC
| | - Rai-Shung Liu
- Frontier Research Center for Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu 300, Taiwan, ROC
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13
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Zhao F, Yu P, Chen Y, Liu F, Houk KN. π-Facial Stereoselectivity in Acyl Nitroso Cycloadditions to 5,5-Unsymmetrically Substituted Cyclopentadienes: Computational Exploration of Origins of Selectivity and the Role of Substituent Conformations on Selectivity. J Org Chem 2021; 86:17082-17089. [PMID: 34783567 DOI: 10.1021/acs.joc.1c02191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The π-facial selectivity of Diels-Alder cycloadditions of 5-monosubstituted cyclopentadienes is known experimentally and has been extensively studied computationally. Previous studies on 5-monosubstituted cyclopentadienes by the Burnell and Houk groups showed that facial selectivity arises principally from hyperconjugative aromaticity or antiaromaticity of polar groups that cause distortion of the cyclopentadiene; steric effects of nonpolar groups can also be important. We have now explored the stereoselective cycloaddition of 5,5-unsymmetrically substituted cyclopentadienes to an acyl nitroso dienophile reported by Kan and co-workers. Computational studies with M06-2X/6-311+G(d,p) indicate that the stereoselectivity in the cycloadditions of 5,5-unsymmetrically substituted cyclopentadienes is not just a simple combination of effects found for monosubstituted counterparts. Substituent conformations and diene-dienophile steric and electronic interaction effects all influence stereoselectivity. Predictions are made about several as-yet-unstudied cyclopentadiene cycloadditions.
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Affiliation(s)
- Fengyue Zhao
- College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Peiyuan Yu
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Yu Chen
- College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Fang Liu
- College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
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14
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Gharpure SJ, Hande PE, Pandey SK, Samala G. TMSOTf-Mediated Formal [4 + 2] Cycloaddition-Retro-aza-Michael Cascade of Vinylogous Carbamates for the Synthesis of Highly Fluorescent Pyridocarbazoles. J Org Chem 2021; 86:16652-16665. [PMID: 34766500 DOI: 10.1021/acs.joc.1c01927] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Trimethylsilyl trifluoromethanesulfonate mediated dimerization reaction of vinylogous carbamates of carbazoles gave highly fluorescent pyridocarbazoles through a Povarov-type formal [4 + 2] cycloaddition-retro-aza-Michael cascade. The developed strategy was used to access indolo pyridocarbazole and quinolizinocarbazolone in an expeditious manner. Various coupling reactions were successfully performed on synthesized pyridocarbazoles to study the effect of electronics of substitution on photophysical properties. Synthesized carbazoles possess excellent photophysical properties with high quantum yields (ΦF). Fluorescent carbazole dicarboxylic acid showed potential as a pH probe to give a linear response to pH over a very wide range (7.0-3.0) reflecting high efficiency.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Pankaj E Hande
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Surya K Pandey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Ganesh Samala
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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15
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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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16
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Chen JX, Jadhav PD, Chen CN, Liu RS. Development of a [2 + 2]-Nitroso/Alkene Cycloaddition Using Sodium Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate Catalyst: Controlled Chemoselectivity of Two Equilibrating Isomeric Intermediates. Org Lett 2021; 23:6246-6251. [PMID: 34351170 DOI: 10.1021/acs.orglett.1c01987] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Sodium tetrakis[3,5-bis(trifluoromethyl)-phenyl]borate (NaBArF) catalyzes the [2 + 2] cycloaddition of 1,4-disubstituted cyclopenta-1,3-dien-2-yl esters with nitrsobenzene in toluene, affording two isolable regioisomers of 6-oxa-7-azabicyclo[3.2.0] heptanes, which thermally rearrange into the same 4-aminocyclopent-1-en-3-ones. In the case of 4-substituted cyclopenta-1,3-dien-2-yl esters, their initial [2 + 2] cycloaddition intermediates undergo a rapid ring expansion to afford six-membered piperidone derivatives efficiently.
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Affiliation(s)
- Jia-Xuan Chen
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China
| | - Prakash D Jadhav
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China
| | - Ching-Nung Chen
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China
| | - Rai-Shung Liu
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China
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17
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More SA, Kardile RD, Kuo TC, Cheng MJ, Liu RS. Gold Catalysts Can Generate Nitrone Intermediates from a Nitrosoarene/Alkene Mixture, Enabling Two Distinct Catalytic Reactions: A Nitroso-Activated Cycloheptatriene/Benzylidene Rearrangement. Org Lett 2021; 23:5506-5511. [PMID: 34232666 DOI: 10.1021/acs.orglett.1c01857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Gold-catalyzed reactions of cycloheptatrienes with nitrosoarenes yield nitrone derivatives efficiently. This reaction sequence enables us to develop gold-catalyzed aerobic oxidations of cycloheptatrienes to afford benzaldehyde derivatives using CuCl and nitrosoarenes as co-catalysts (10-30 mol %). Our density functional theory calculations support a novel nitroso-activated rearrangement, tropylium → benzylidene. With the same nitrosoarenes, we developed their gold-catalyzed [2 + 2 + 1]-annulations between nitrosobenzene and two enol ethers to yield 5-alkoxyisoxazolidines using 1,4-cyclohexadienes as hydrogen donors.
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Affiliation(s)
- Sayaji Arjun More
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
| | - Rahul Dadabhau Kardile
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
| | - Tung-Chun Kuo
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan, Republic of China
| | - Mu-Jeng Cheng
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan, Republic of China
| | - Rai-Shung Liu
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
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18
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Chen C, Cheng W, Wang J, Chao T, Cheng M, Liu R. Gold‐Catalyzed [3+2]‐Annulations of α‐Aryl Diazoketones with the Tetrasubstituted Alkenes of Cyclopentadienes: High Stereoselectivity and Enantioselectivity. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202012611] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ching‐Nung Chen
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
| | - Wei‐Min Cheng
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
| | - Jian‐Kai Wang
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
| | - Tzu‐Hsuan Chao
- Department of Chemistry National Cheng Kung University East District Tainan City Taiwan, ROC
| | - Mu‐Jeng Cheng
- Department of Chemistry National Cheng Kung University East District Tainan City Taiwan, ROC
| | - Rai‐Shung Liu
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
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19
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Wei BY, Xie DT, Lai SQ, Jiang Y, Fu H, Wei D, Han B. Electrochemically Tuned Oxidative [4+2] Annulation and Dioxygenation of Olefins with Hydroxamic Acids. Angew Chem Int Ed Engl 2021; 60:3182-3188. [PMID: 33058402 DOI: 10.1002/anie.202012209] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Indexed: 12/23/2022]
Abstract
This work represents the first [4+2] annulation of hydroxamic acids with olefins for the synthesis of benzo[c][1,2]oxazines scaffold via anode-selective electrochemical oxidation. This protocol features mild conditions, is oxidant free, shows high regioselectivity and stereoselectivity, broad substrate scope of both alkenes and hydroxamic acids, and is compatible with terpenes, peptides, and steroids. Significantly, the dioxygenation of olefins employing hydroxamic acid is also successfully achieved by switching the anode material under the same reaction conditions. The study not only reveals a new reactivity of hydroxamic acids and its first application in electrosynthesis but also provides a successful example of anode material-tuned product selectivity.
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Affiliation(s)
- Bang-Yi Wei
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Dong-Tai Xie
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Sheng-Qiang Lai
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Yu Jiang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Hong Fu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Dian Wei
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Bing Han
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
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20
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Li XS, Xu DT, Niu ZJ, Li M, Shi WY, Wang CT, Wei WX, Liang YM. Gold-Catalyzed Tandem Annulations of Pyridylhomopropargylic Alcohols with Propargyl Alcohols. Org Lett 2021; 23:832-836. [PMID: 33507087 DOI: 10.1021/acs.orglett.0c04070] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A gold-catalyzed tandem annulation of propargylic alcohols and pyridylhomopropargylic alcohols is achieved, providing an atom-economical approach to a diverse set of polycyclic dihydrobenzofurans in good yields. The reaction proceeds via the 5-endo-dig cyclization/Meyer-Schuster rearrangement/Friedel-Crafts-type pathway. In this way, three C-C bonds and one C-O bond form to give a polycyclic skeleton in a one-pot process. Moreover, the products exhibit unique optical properties, which reveal their potential application value.
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Affiliation(s)
- Xue-Song Li
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Dan-Tong Xu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Zhi-Jie Niu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Ming Li
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Wei-Yu Shi
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Cui-Tian Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Wan-Xu Wei
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Yong-Min Liang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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21
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Vinogradov MG, Turova OV, Zlotin SG. Catalytic Asymmetric Aza‐Diels‐Alder Reaction: Pivotal Milestones and Recent Applications to Synthesis of Nitrogen‐Containing Heterocycles. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001307] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Maxim G. Vinogradov
- N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences 47 Leninsky prosp. 119991 Moscow Russian Federation
| | - Olga V. Turova
- N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences 47 Leninsky prosp. 119991 Moscow Russian Federation
| | - Sergei G. Zlotin
- N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences 47 Leninsky prosp. 119991 Moscow Russian Federation
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22
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Chada RR, Kajare RC, Bhandari MC, Mohammed SZ, Khatravath M, Warudikar K, Punna N. Facile access to [1,2]-oxazine derivatives via annulations of aminoxy-tethered 1,7-enynes. Org Biomol Chem 2021; 19:809-821. [PMID: 33403372 DOI: 10.1039/d0ob02279a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach for the highly diastereoselective construction of functionalized cyclopenta[d][1,2]oxazines via sequential oxyamination and Pauson-Khand reaction of readily accessible propargylic alcohols has been developed. Furthermore, the ring closing metathesis of these N-O linked 1,7-enynes afforded vinylated-[1,2]oxazines in good yields. The reduction of the N-O bond of the obtained cyclopenta[d][1,2]oxazine is accomplished to access cyclopentenone-based amino alcohols.
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Affiliation(s)
- Raji Reddy Chada
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Roshan Chandrakant Kajare
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Mayur C Bhandari
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Siddique Z Mohammed
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Mahender Khatravath
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India.
| | - Kamalkishor Warudikar
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Nagender Punna
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
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23
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Chen C, Cheng W, Wang J, Chao T, Cheng M, Liu R. Gold‐Catalyzed [3+2]‐Annulations of α‐Aryl Diazoketones with the Tetrasubstituted Alkenes of Cyclopentadienes: High Stereoselectivity and Enantioselectivity. Angew Chem Int Ed Engl 2021; 60:4479-4484. [DOI: 10.1002/anie.202012611] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 11/18/2020] [Indexed: 01/14/2023]
Affiliation(s)
- Ching‐Nung Chen
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
| | - Wei‐Min Cheng
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
| | - Jian‐Kai Wang
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
| | - Tzu‐Hsuan Chao
- Department of Chemistry National Cheng Kung University East District Tainan City Taiwan, ROC
| | - Mu‐Jeng Cheng
- Department of Chemistry National Cheng Kung University East District Tainan City Taiwan, ROC
| | - Rai‐Shung Liu
- Frontier Research Center for Matter Science and Technology and Department of Chemistry National Tsing-Hua University Hsinchu Taiwan, ROC
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24
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Abstract
This review summarizes the recent achievements of dinuclear gold-catalyzed redox coupling, asymmetric catalysis and photocatalysis. The dinuclear gold catalysts show a better catalytic performance than the mononuclear gold catalysts in certain cases.
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Affiliation(s)
- Wenliang Wang
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Cheng-Long Ji
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Kai Liu
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Chuan-Gang Zhao
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Weipeng Li
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Jin Xie
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- Chemistry and Biomedicine Innovation Center (ChemBIC)
- School of Chemistry and Chemical Engineering
- Nanjing University
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25
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Wei B, Xie D, Lai S, Jiang Y, Fu H, Wei D, Han B. Electrochemically Tuned Oxidative [4+2] Annulation and Dioxygenation of Olefins with Hydroxamic Acids. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202012209] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Bang‐Yi Wei
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
| | - Dong‐Tai Xie
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
| | - Sheng‐Qiang Lai
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
| | - Yu Jiang
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
| | - Hong Fu
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
| | - Dian Wei
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
| | - Bing Han
- State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
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26
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Kim H, Jang J, Shin S. Gold-Catalyzed Asymmetric Thioallylation of Propiolates via Charge-Induced Thio-Claisen Rearrangement. J Am Chem Soc 2020; 142:20788-20795. [PMID: 33206513 DOI: 10.1021/jacs.0c09783] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A gold(I)-catalyzed enantioselective thioallylation of propiolates with allyl sulfides is described. The key mechanistic element is a sulfonium-induced Claisen rearrangement which helps minimize the allyl dissociation and render higher enantioselectivity. This protocol features remarkable scope of the allyl moiety, allowing enantiocontrolled synthesis of all-carbon quaternary centers, and exhibits exceptional functional group compatibility with many Lewis bases and π-bonds. This intermolecular variant of Claisen rearrangement forges both C-S and C-C bonds concomitantly, providing efficient access to interesting optically active organosulfur compounds which can be transformed further through the vinyl sulfide as a functional handle. The rate of the reaction was zeroth order with respect to allyl sulfides, which suggested a reversible inhibition, providing a resting state for the catalyst. The Hammett plot displayed a correlation with σp values, suggesting a turnover-limiting sigmatropic rearrangement where decreased electron-density on sulfur accelerated the rearrangement.
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Affiliation(s)
- Hanbyul Kim
- Department of Chemistry, Research Institute of Natural Sciences and Center for New Directions in Organic Synthesis (CNOS), Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, South Korea
| | - Jiwon Jang
- Department of Chemistry, Research Institute of Natural Sciences and Center for New Directions in Organic Synthesis (CNOS), Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, South Korea
| | - Seunghoon Shin
- Department of Chemistry, Research Institute of Natural Sciences and Center for New Directions in Organic Synthesis (CNOS), Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, South Korea
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