1
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Chicas-Baños DF, López-Rivas M, González-Bravo FJ, Sartillo-Piscil F, Frontana-Uribe BA. Access to carbonyl compounds via the electroreduction of N-benzyloxyphthalimides: Mechanism confirmation and preparative applications. Heliyon 2024; 10:e23808. [PMID: 38226225 PMCID: PMC10788431 DOI: 10.1016/j.heliyon.2023.e23808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 12/10/2023] [Accepted: 12/13/2023] [Indexed: 01/17/2024] Open
Abstract
A method to access carbonyl compounds using reductive conditions was evaluated via electrochemical reduction of their corresponding N-benzyloxyphthalimide derivatives (NBOPIs). The mechanism of this originally reported electrochemical reaction was proposed based on DFT calculation and is experimentally confirmed herein, contrasting simulated and experimental cyclic voltammetry data. The reaction scope studied in a preparative scale and using redox sensitive functional groups showed good selectivity and tolerance toward oxidation under the reaction conditions with a moderate to good yield (50-71%). Nevertheless, some restrictions with reducible functional groups, like benzyl-brominated and nitro-aromatic derivatives, were observed. The present approach can be considered a self-sustainable electrochemical catalysis for the synthesis of aromatic carbonylic compounds passing through anion radical intermediates produced by a cathodic reaction.
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Affiliation(s)
- Diego Francisco Chicas-Baños
- Universidad de El Salvador (UES), Facultad de Ciencias Naturales y Matemática, Escuela de Química, Final 25 Av. Nte, 1101, San Salvador, El Salvador
- Universidad Nacional Autónoma de México, Instituto de Química, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Mariely López-Rivas
- Centro Conjunto Química Sustentable UAEMéx-UNAM, Km 14.5 Carretera Toluca-Ixtlahuaca, Toluca, 50200, Estado de México, Mexico
| | - Felipe J. González-Bravo
- Departamento de Química, Centro de Investigación y Estudios Avanzados, Av. Instituto Politécnico Nacional 2508, 07360, Mexico City, Mexico
| | - Fernando Sartillo-Piscil
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP), 14 Sur Esq. San Claudio, Col. San Manuel, 72570, Puebla, Mexico
| | - Bernardo Antonio Frontana-Uribe
- Universidad Nacional Autónoma de México, Instituto de Química, Ciudad Universitaria, Mexico City, 04510, Mexico
- Centro Conjunto Química Sustentable UAEMéx-UNAM, Km 14.5 Carretera Toluca-Ixtlahuaca, Toluca, 50200, Estado de México, Mexico
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2
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Xochicale-Santana L, Cortezano-Arellano O, Frontana-Uribe BA, Jimenez-Pérez VM, Sartillo-Piscil F. The Stereoselective Total Synthesis of the Elusive Cephalosporolide F. J Org Chem 2023; 88:4880-4885. [PMID: 36989415 DOI: 10.1021/acs.joc.3c00251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Here we report a seven-step protecting-group-free stereoselective total synthesis of the elusive (+)-cephalosporolide F from d-glucose. A microwave-assisted reaction between the Meldrum's acid and the d-glucose to the respective octono-1,4-lactone derivative, and a low temperature visible-light photoredox spirocyclization of a chiral N-alkoxyphthalimide to ceph F, are the two key chemical reactions that allowed the accomplishment of this unprecedented feat under an environmentally friendly processes.
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Affiliation(s)
- Leonardo Xochicale-Santana
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP), 14 Sur Esq. San Claudio, Col. San Manuel, 72570 Puebla, México
- Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Pedro de Alba s/n, C.P. 66541 Nuevo León, México
| | - Omar Cortezano-Arellano
- Instituto de Ciencias Básicas, Universidad Veracruzana, Luis Castelazo Ayala, Col. Industrial Ánimas, 91190 Xalapa, Veracruz, México
| | - Bernardo A Frontana-Uribe
- Centro Conjunto de Investigaciones en Química Sustentable UAEMéx-UNAM, Km 14.5 Carretera Toluca Atlacomulco San Cayetano-Toluca, 50200 Estado de México, México
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, 04510 CDMX, México
| | - Victor M Jimenez-Pérez
- Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Pedro de Alba s/n, C.P. 66541 Nuevo León, México
| | - Fernando Sartillo-Piscil
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP), 14 Sur Esq. San Claudio, Col. San Manuel, 72570 Puebla, México
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3
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Okazaki S, Senda K, Tokuta A, Inagaki M, Kamaike K, Ota K, Miyaoka H. Biomimetic total synthesis of plakortone Q via acid-mediated tandem cyclization. Org Biomol Chem 2022; 20:6771-6775. [PMID: 35796262 DOI: 10.1039/d2ob01032a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Plakortone Q and plakdiepoxide are natural polyketides isolated from the marine sponge Plakortis simplex. Bicyclo[3.3.0]furanolactone compounds, including plakortone Q, are expected to exhibit a wide range of pharmacological activities. Therefore, developing a simple and versatile synthetic method to produce these compounds is an important research goal. We have achieved the first total synthesis of plakortone Q and plakdiepoxide through an efficient protecting-group-free strategy. The key transformation was an acid-mediated tandem 5-endo-tet/5-endo-tet cyclization of vicinal diepoxide to build the tetrahydrofuran-γ-lactone motif.
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Affiliation(s)
- Shinnosuke Okazaki
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Kaho Senda
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Ayaka Tokuta
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Misa Inagaki
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Kazuo Kamaike
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Koichiro Ota
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Hiroaki Miyaoka
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
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4
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Budnikov AS, Krylov I, Lastovko AV, Yu B, Terent'ev AO. N‐Alkoxyphtalimides as Versatile Alkoxy Radical Precursors in Modern Organic Synthesis. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Alexander S. Budnikov
- Zelinsky Institute of Organic Chemistry RAS: Institut organiceskoj himii imeni N D Zelinskogo RAN Laboratory for Studies of Homolytic Reactions RUSSIAN FEDERATION
| | - Igor Krylov
- Zelinsky Institute of Organic Chemistry RAS: Institut organiceskoj himii imeni N D Zelinskogo RAN Laboratory for Studies of Homolytic Reactions Leninsky Prospect, 47 119991 Moscow RUSSIAN FEDERATION
| | - Andrey V. Lastovko
- Zelinsky Institute of Organic Chemistry RAS: Institut organiceskoj himii imeni N D Zelinskogo RAN Laboratory for Studies of Homolytic Reactions RUSSIAN FEDERATION
| | - Bing Yu
- Zhengzhou University Green Catalysis Center CHINA
| | - Alexander O. Terent'ev
- Zelinsky Institute of Organic Chemistry RAS: Institut organiceskoj himii imeni N D Zelinskogo RAN Laboratory for Studies of Homolytic Reactions Leninsky prospekt 47 119991 Moscow RUSSIAN FEDERATION
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5
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León EI, Martín Á, Montes AS, Pérez-Martín I, Del Sol Rodríguez M, Suárez E. 1,5-Hydrogen Atom Transfer/Surzur-Tanner Rearrangement: A Radical Cascade Approach for the Synthesis of 1,6-Dioxaspiro[4.5]decane and 6,8-Dioxabicyclo[3.2.1]octane Scaffolds in Carbohydrate Systems. J Org Chem 2021; 86:14508-14552. [PMID: 34554734 PMCID: PMC8576821 DOI: 10.1021/acs.joc.1c01376] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
![]()
The 1,5-HAT–1,2-(ester)alkyl
radical migration (Surzur–Tanner
rearrangement) radical/polar sequence triggered by alkoxyl radicals
has been studied on a series of C-glycosyl substrates
with 3-C-(α,β-d,l-glycopyranosyl)1-propanol
and C-(α-d,l-glycopyranosyl)methanol
structures prepared from chiral pool d- and l-sugar.
The use of acetoxy and diphenoxyphosphatoxy as leaving groups provides
an efficient construction of 10-deoxy-1,6-dioxaspiro[4.5]decane and
4-deoxy-6,8-dioxabicyclo[3.2.1]octane frameworks. The alkoxyl radicals
were generated by the reaction of the corresponding N-alkoxyphthalimides with group 14 hydrides [n-Bu3SnH(D) and (TMS)3SiH], and in comparative terms,
the reaction was also initiated by visible light photocatalysis using
the Hantzsch ester/fac-Ir(ppy)3 procedure.
Special attention was devoted to the influence of the relative stereochemistry
of the centers involved in the radical sequence on the reaction outcome.
The addition of BF3•Et2O as a catalyst
to the radical sequence resulted in a significant increase in the
yields of the desired bicyclic ketals.
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Affiliation(s)
- Elisa I León
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Ángeles Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Adrián S Montes
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain.,Doctoral and Postgraduate School, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez s/n, 38200 La Laguna, Tenerife, Spain
| | - Inés Pérez-Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - María Del Sol Rodríguez
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Ernesto Suárez
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
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Omar CA, Fernando SP. Nucleophilic substitution at the anomeric position of furanose carbohydrates. The case of the C-allylations. Carbohydr Res 2021; 510:108441. [PMID: 34700220 DOI: 10.1016/j.carres.2021.108441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/31/2021] [Accepted: 09/07/2021] [Indexed: 11/28/2022]
Abstract
Taking advantage of the locked conformation of cyclic furanose form, carbohydrate derivatives have been transformed into relevant tetrahydrofuran moieties through a chemical operation commonly known as C-glycosylation reaction. Consequently, a large number of total synthesis of naturally occurring products containing this heterocycle have been accomplished by applying this reaction. In this regard, the C-allylation reaction of furanose carbohydrates provides flexible routes for stereoselective anomeric functionalization by incorporating an allyl group, which is eventually re-functionalized into advanced natural product intermediates. Therefore, this mini review deals with the description of the origin of the stereoselectivity and synthetic applications of this type of glycosylation reaction, which can be also called as: "Nucleophilic Substitution at the Anomeric Position", conducted by various research groups including our own group.
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Affiliation(s)
- Cortezano-Arellano Omar
- Instituto de Ciencias Básicas, Universidad Veracruzana, Luis Castelazo Ayala, Col. Industrial Ánimas, 91190, Xalapa, Ver., Mexico
| | - Sartillo-Piscil Fernando
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP), 14 Sur Esq. San Claudio, Col. San Manuel, 72570, Puebla, Mexico.
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7
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Zhang X, Paton RS. Stereoretention in styrene heterodimerisation promoted by one-electron oxidants. Chem Sci 2020; 11:9309-9324. [PMID: 34123173 PMCID: PMC8163378 DOI: 10.1039/d0sc03059g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Radical cations generated from the oxidation of C
Created by potrace 1.16, written by Peter Selinger 2001-2019
]]>
C π-bonds are synthetically useful reactive intermediates for C–C and C–X bond formation. Radical cation formation, induced by sub-stoichiometric amounts of external oxidant, are important intermediates in the Woodward–Hoffmann thermally disallowed [2 + 2] cycloaddition of electron-rich alkenes. Using density functional theory (DFT), we report the detailed mechanisms underlying the intermolecular heterodimerisation of anethole and β-methylstyrene to give unsymmetrical, tetra-substituted cyclobutanes. Reactions between trans-alkenes favour the all-trans adduct, resulting from a kinetic preference for anti-addition reinforced by reversibility at ambient temperatures since this is also the thermodynamic product; on the other hand, reactions between a trans-alkene and a cis-alkene favour syn-addition, while exocyclic rotation in the acyclic radical cation intermediate is also possible since C–C forming barriers are higher. Computations are consistent with the experimental observation that hexafluoroisopropanol (HFIP) is a better solvent than acetonitrile, in part due to its ability to stabilise the reduced form of the hypervalent iodine initiator by hydrogen bonding, but also through the stabilisation of radical cationic intermediates along the reaction coordinate. A computational study details the mechanism, catalytic cycle and origins of stereoselectivity underlying hole-catalyzed intermolecular alkene heterodimerisation to give unsymmetrical, tetra-substituted cyclobutanes.![]()
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Affiliation(s)
- Xinglong Zhang
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Robert S Paton
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK.,Department of Chemistry, Colorado State University Fort Collins CO 80523 USA
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8
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Sandoval-Lira J, Solano-Altamirano JM, Cortezano-Arellano O, Cruz-Gregorio S, Meza-León RL, Hernández-Pérez JM, Sartillo-Piscil F. Can an n (O) → π* Interaction Provide Thermodynamic Stability to Naturally Occurring Cephalosporolides? J Org Chem 2019; 84:2126-2132. [PMID: 30649874 DOI: 10.1021/acs.joc.8b03116] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The stereocontrolled synthesis of naturally occurring products containing a 5,5-spiroketal molecular structure represents a major synthetic problem. Moreover, in a previous work, the stereocontrolled synthesis of cephalosporolide E (ceph E), which presumably was obtained from its epimer congener (ceph F) through an acid-mediated equilibration process, was reported. Consequently, we performed a theoretical investigation to provide relevant information regarding the title question, and it was found that the higher thermodynamic stability of ceph E, relative to ceph F, is caused by an n → π* interaction between a lone electron pair of the oxygen atom of the spiroketal ring (nO) and the antibonding orbital of the carbonyl group (π*C=O). Although similar stereoelectronic interactions have been disclosed in other molecular structures, its presence in ceph E, and very likely in other related naturally occurring products, represents a novel nonanomeric stabilizing effect that should be introduced into the chemical literature.
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Affiliation(s)
- Jacinto Sandoval-Lira
- Centro de Investigación de la Facultad de Ciencias Químicas , Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Col. San Manuel , 72570 Puebla , México.,Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM , Personal de la UNAM , Carretera Km. 14.5, Unidad San Cayetano, Toluca - Atlacomulco , 50200 Toluca de Lerdo , México
| | - Juan M Solano-Altamirano
- Centro de Investigación de la Facultad de Ciencias Químicas , Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Col. San Manuel , 72570 Puebla , México
| | - Omar Cortezano-Arellano
- Centro de Investigación de la Facultad de Ciencias Químicas , Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Col. San Manuel , 72570 Puebla , México
| | - Silvano Cruz-Gregorio
- Centro de Investigación de la Facultad de Ciencias Químicas , Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Col. San Manuel , 72570 Puebla , México
| | | | - Julio M Hernández-Pérez
- Centro de Investigación de la Facultad de Ciencias Químicas , Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Col. San Manuel , 72570 Puebla , México
| | - Fernando Sartillo-Piscil
- Centro de Investigación de la Facultad de Ciencias Químicas , Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Col. San Manuel , 72570 Puebla , México
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9
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Blue light photoredox decarboxylation and tin-free Barton-McCombie reactions in the stereoselective synthesis of (+)-muscarine. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2018.12.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10
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Yao H, Wang J, Tong R. Recent Developments in Total Syntheses of Cephalosporolides, Penisporolides, and Ascospiroketals. CHEM REC 2017; 17:1109-1123. [DOI: 10.1002/tcr.201700001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Hongliang Yao
- Guangdong Key Laboratory of Plant Resources, School of Life Sciences; Sun Yat-sen University; Xingang Xi Road Guangzhou 510275, Guangdong China
| | - Jian Wang
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong China
| | - Rongbiao Tong
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong China
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11
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The first stereoselective non-biological synthesis of chiral 6-pentyl-2 H -pyran-2-ones: total synthesis of metabolites isolated from Trichoderma spp and Penicillium isolates. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.08.089] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Halle MB, Fernandes RA. Total Synthesis of Marine Natural Products: Cephalosporolides. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600208] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mahesh B. Halle
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai 400076 Maharashtra India
| | - Rodney A. Fernandes
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai 400076 Maharashtra India
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13
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Wang J, Tong R. Total Synthesis of Purported Cephalosporolides H and I, Penisporolide B, and Their Stereoisomers. J Org Chem 2016; 81:4325-39. [DOI: 10.1021/acs.joc.6b00788] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jian Wang
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water
Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water
Bay, Kowloon, Hong Kong, China
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14
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Abstract
A new hypothetic biosynthesis of the tricyclic spiroketal core of ascospiroketals A and B is proposed, which guided the development of a novel synthetic strategy for the asymmetric total synthesis of ent-ascospiroketals A and B. The synthesis features an efficient ring contraction rearrangement of the 10-membered lactone to the tricyclic spiroketal cis-fused γ-lactone core, which served as the common intermediate for the synthesis of both ent-ascospiroketals A and B through the Stille coupling reaction at the final step. In addition, seven diastereomers were prepared to conclusively confirm the structure of ent-ascospiroketal B.
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Affiliation(s)
- Jian Wang
- Department of Chemistry, The Hong Kong University of Science and Technology , Clearwater Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology , Clearwater Bay, Kowloon, Hong Kong, China
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15
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Raghavan S, Patel JS, Ramakrishna KVS. Synthesis of (−) cephalosporolide E and (+) cephalosporolide F utilizing the vinylogous Mukaiyama type reaction with an α-chloro sulfide. RSC Adv 2016. [DOI: 10.1039/c6ra13861f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An asymmetric synthesis of (−)-cephalosporolide E and (+)-cephalosporolide F employing vinylogous Mukaiyama type reaction with an α-chloro sulfide, Noyori transfer hydrogenation and oxidative cyclization as the key steps is described.
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Affiliation(s)
- Sadagopan Raghavan
- Academy of Scientific and Innovative Research
- Indian Institute of Chemical Technology
- Hyderabad
- India
- Natural Products Chemistry Division
| | - Javed Sardar Patel
- Academy of Scientific and Innovative Research
- Indian Institute of Chemical Technology
- Hyderabad
- India
- Natural Products Chemistry Division
| | - K. V. S. Ramakrishna
- Centre for NMR and Structural Chemistry
- Indian Institute of Chemical Technology
- Hyderabad
- India
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16
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Chang S, Hur S, Britton R. Total Synthesis and Configurational Assignment of Ascospiroketal A. Chemistry 2015; 21:16646-53. [PMID: 26424097 DOI: 10.1002/chem.201502754] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Indexed: 11/09/2022]
Abstract
The total synthesis of the marine fungus-derived natural product ascospiroketal is described. This concise synthesis relies on a unique Ag(I) -promoted tandem cascade cyclization that provides direct access to the correctly configured tricyclic core of the natural product from a linear precursor. The synthesis of candidate stereostructures of ascospiroketal A allowed for the confident assignment of both the relative and absolute stereochemistry of this unusual octaketide.
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Affiliation(s)
- Stanley Chang
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada)
| | - Soo Hur
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada)
| | - Robert Britton
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada).
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17
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González-Márquez V, Cruz-Gregorio S, Sandoval-Lira J, Quintero L, Sartillo-Piscil F. Total synthesis of the proposed structure of decurrenside D. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.08.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Chaudhari DA, Kattanguru P, Fernandes RA. A concise protecting-group-free synthesis of cephalosporolides E and F. RSC Adv 2015. [DOI: 10.1039/c5ra06991b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
A concise protecting-group-free synthesis of cephalosporolides E and F has been accomplished from l-mannonic-γ-lactone by one-pot conversion to γ-vinyl-β-hydroxy-γ-lactone, cross-metathesis and Wacker-type oxidative spiroketalization.
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Affiliation(s)
- Dipali A. Chaudhari
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400 076
- India
| | - Pullaiah Kattanguru
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400 076
- India
| | - Rodney A. Fernandes
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400 076
- India
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