1
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Struwe H, Schrödter F, Spinck H, Kirschning A. Sesquiterpene Backbones Generated by Sesquiterpene Cyclases: Formation of iso-Caryolan-1-ol and an Isoclovane. Org Lett 2023; 25:8575-8579. [PMID: 38011332 PMCID: PMC10714441 DOI: 10.1021/acs.orglett.3c03383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/10/2023] [Accepted: 11/13/2023] [Indexed: 11/29/2023]
Abstract
New sesquiterpene backbones are accessible after incubation of caryolan-synthase (GcoA) and presilphiperfolan-8-β-ol synthase (BcBOT2) with a non-natural farnesyldiphosphate in which the central olefinic double bond is isomerized toward the methyl group. Two newly formed sesquiterpenoids are reported, a constitutional isomer of caryolan-1-ol (3), which we name iso-caryolan-1-ol (17), and the first terpenoid based on the isoclovane ring skeleton generated enzymatically thus far.
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Affiliation(s)
- Henry Struwe
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | - Finn Schrödter
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | - Hanke Spinck
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | - Andreas Kirschning
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
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2
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Lin X, Min L, Li CC. Asymmetric Synthesis of the epi-Vinigrol Tricyclic Core Enabled by a Wolff Rearrangement Strategy and Formal Total Synthesis of (-)-Vinigrol. J Org Chem 2023; 88:14826-14830. [PMID: 37821441 DOI: 10.1021/acs.joc.3c01729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
A new approach to construct the tricyclic framework of the diterpenoid vinigrol is described. The challenging 1,5-butanodecahydronaphthalene core was established efficiently and diastereoselectively through a combination of type II [5 + 2] cycloaddition and Wolff rearrangement. In addition, a formal total synthesis of (-)-vinigrol was achieved in 12 steps, in which Baran's intermediate was efficiently produced from a known compound by a two-step sequence involving a stereoselective α-hydroxylation and a diastereoselective α-ketol rearrangement.
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Affiliation(s)
- Xiaohong Lin
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Long Min
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Bay Laboratory, Shenzhen 518132, China
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3
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Saladrigas M, Gómez-Bengoa E, Bonjoch J, Bradshaw B. Four-Step Synthesis of (-)-4-epi-Presilphiperfolan-8α-ol by Intramolecular Iron Hydride Atom Transfer-Mediated Ketone-Alkene Coupling and Studies to Access trans-Hydrindanols with a Botryane Scaffold. Chemistry 2023; 29:e202203286. [PMID: 36537992 DOI: 10.1002/chem.202203286] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/20/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022]
Abstract
From an (R)-(+)-pulegone-derived building block that incorporates the stereo-defined tertiary carbon bearing a methyl group, as found in the targeted sesquiterpenoid, a four-step synthesis of (-)-4-epi-presilphiperfolan-8-α-ol was achieved. The key processes involved are a ring-closing metathesis leading to a bridged alkene-tethered ketone and its subsequent FeIII -mediated metal-hydride atom transfer (MHAT) transannular cyclization. This synthetic method, implying an irreversible addition of a carbon-centered radical upon a ketone by means of a hydrogen atom transfer upon the alkoxy radical intermediate, was also applied in the synthesis of trans-fused hydrindanols structurally related to botrydial compounds.
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Affiliation(s)
- Mar Saladrigas
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB, Universitat de Barcelona, Av. Joan XXIII 27-31, 08028, Barcelona, Spain
| | - Enrique Gómez-Bengoa
- Departamento de Química Orgánica I, Universidad del País Vasco, Manuel Lardizábal 3, 20018, San Sebastián, Spain
| | - Josep Bonjoch
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB, Universitat de Barcelona, Av. Joan XXIII 27-31, 08028, Barcelona, Spain
| | - Ben Bradshaw
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB, Universitat de Barcelona, Av. Joan XXIII 27-31, 08028, Barcelona, Spain
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4
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Xie J, Zheng Z, Liu X, Zhang N, Choi S, He C, Dong G. Asymmetric Total Synthesis of (+)-Phainanoid A and Biological Evaluation of the Natural Product and Its Synthetic Analogues. J Am Chem Soc 2023; 145:4828-4852. [PMID: 36799470 DOI: 10.1021/jacs.2c13889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Here, we report our detailed efforts toward the synthesis of phainanoids, a novel class of dammarane-type triterpenoids with potent immunosuppressive activities and unique structural features. Systematic model studies have been carried out, and efficient approaches have been established to construct the benzofuranone-based 4,5-spirocycle, the D/E/F tricyclic core, the [4.3.1] propellane, and the 5,5-oxaspirolactone moieties. The asymmetric synthesis of (+)-phainanoid A has been achieved through kinetic resolution of the tricyclic core followed by diastereoselective installation of the A/B/C and G/H rings and fragment coupling with the enantioenriched I/J rings. In addition, novel estrone-derived phainanoid analogues have been prepared. The immunosuppressive and cell survival assays revealed that (+)-phainanoid A and some of its synthetic analogues can specifically inhibit stimulation-induced lymphocyte proliferation but not cell survival at their effective concentrations. Preliminary structure-activity relationship information has been obtained, which could inspire future design of immunosuppressive phainanoid analogues.
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Affiliation(s)
- Jiaxin Xie
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Zhong Zheng
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Xin Liu
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Nan Zhang
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Shinyoung Choi
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Chuan He
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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5
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Yang J, Zhang P, Shen Z, Zhou Y, Yu ZX. Unprecedented endo-oxidative cyclometallation and [4 + 3] cycloaddition of diene-vinylcyclopropanes. Chem 2023. [DOI: 10.1016/j.chempr.2023.01.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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6
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Ligand enabled none-oxidative decarbonylation of aliphatic aldehydes. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.108027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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7
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Li LX, Min L, Yao TB, Ji SX, Qiao C, Tian PL, Sun J, Li CC. Total Synthesis of Yuzurine-type Alkaloid Daphgraciline. J Am Chem Soc 2022; 144:18823-18828. [PMID: 36198113 DOI: 10.1021/jacs.2c09548] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first total synthesis of daphgraciline has been achieved, which also represents the first example of the synthesis of Daphniphyllum yuzurine-type alkaloids (∼50 members). The unique bridged azabicyclo[4.3.1] ring system in the yuzurine-type subfamily was efficiently and diastereoselectively assembled via a mild type II [5+2] cycloaddition for the first time. The compact tetracyclic [6-7-5-5] skeleton was installed efficiently via an intramolecular Diels-Alder reaction, followed by a benzilic acid-type rearrangement. The synthetically challenging spiro tetrahydropyran moiety in the final product was installed diastereoselectively via a TiIII-mediated reductive epoxide coupling reaction. Potential access to enantioenriched daphgraciline is presented.
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Affiliation(s)
- Li-Xuan Li
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China.,Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Long Min
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Tian-Bing Yao
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Shu-Xiao Ji
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Chuang Qiao
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Pei-Lin Tian
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jianwei Sun
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China.,Shenzhen Bay Laboratory, Shenzhen 518132, China
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8
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Hui C, Craggs L, Antonchick AP. Ring contraction in synthesis of functionalized carbocycles. Chem Soc Rev 2022; 51:8652-8675. [PMID: 36172989 DOI: 10.1039/d1cs01080h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbocycles are a key and widely present structural motif in organic compounds. The construction of structurally intriguing carbocycles, such as highly-strained fused rings, spirocycles or highly-functionalized carbocycles with congested stereocenters, remains challenging in organic chemistry. Cyclopropanes, cyclobutanes and cyclopentanes within such carbocycles can be synthesized through ring contraction. These ring contractions involve re-arrangement of and/or small molecule extrusion from a parental ring, which is either a carbocycle or a heterocycle of larger size. This review provides an overview of synthetic methods for ring contractions to form cyclopropanes, cyclobutanes and cyclopentanes en route to structurally intriguing carbocycles.
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Affiliation(s)
- Chunngai Hui
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany. .,Technical University Dortmund, Faculty of Chemistry and Chemical Biology, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | - Luke Craggs
- Nottingham Trent University, School of Science and Technology, Department of Chemistry and Forensics, Clifton Lane, NG11 8NS Nottingham, UK
| | - Andrey P Antonchick
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany. .,Technical University Dortmund, Faculty of Chemistry and Chemical Biology, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany.,Nottingham Trent University, School of Science and Technology, Department of Chemistry and Forensics, Clifton Lane, NG11 8NS Nottingham, UK
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9
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Yamaguchi K, Shimizu T, Miura A, Ishida K, Kusama H. Photoinduced Intramolecular Cyclization of Acylsilanes Bearing a Boronate Moiety: Construction of a Highly Strained trans-Fused Bicyclo[3.3.0]octane Skeleton. Org Lett 2022; 24:5807-5811. [PMID: 35920627 DOI: 10.1021/acs.orglett.2c02337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A reliable strategy for the construction of trans-fused bicyclo[n.3.0] skeletons was explored by utilizing photoinduced cyclization of acylsilanes bearing a boronate. The substrates having an acylsilane and a boronate in a 1,2-trans relationship were prepared via hydroboration of cycloalkene derivatives. The desired cyclization was efficiently promoted by photoirradiation to give the trans-fused bicyclo[n.3.0] derivatives as a single diastereomer. It is noteworthy that this methodology enables the efficient construction of a highly strained trans-5-5 ring system.
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Affiliation(s)
- Kohei Yamaguchi
- Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo 171-8588, Japan
| | - Tsukasa Shimizu
- Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo 171-8588, Japan
| | - Arihito Miura
- Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo 171-8588, Japan
| | - Kento Ishida
- Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo 171-8588, Japan
| | - Hiroyuki Kusama
- Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo 171-8588, Japan
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10
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Spectroscopic and Molecular Docking Studies of Cu(II), Ni(II), Co(II), and Mn(II) Complexes with Anticonvulsant Therapeutic Agent Gabapentin. Molecules 2022; 27:molecules27134311. [PMID: 35807555 PMCID: PMC9268275 DOI: 10.3390/molecules27134311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/30/2022] [Accepted: 07/01/2022] [Indexed: 12/10/2022] Open
Abstract
New Cu(II), Ni(II), Co(II), and Mn(II) complexes of the gabapentin (Gpn) bidentate drug ligand were synthesized and studied using elemental analyses, melting temperatures, molar conductivity, UV–Vis, magnetic measurements, FTIR, and surface morphology (scanning (SEM) and transmission (TEM) electron microscopes).The gabapentin ligand was shown to form monobasic metal:ligand (1:1) stoichiometry complexes with the metal ions Cu(II), Ni(II), Co(II), and Mn(II). Molar conductance measurements in dimethyl-sulfoxide solvent with a concentration of 10−3 M correlated to a non-electrolytic character for all of the produced complexes. A deformed octahedral environment was proposed for all metal complexes. Through the nitrogen atom of the –NH2 group and the oxygen atom of the carboxylate group, the Gpn drug chelated as a bidentate ligand toward the Mn2+, Co2+, Ni2+, and Cu2+ metal ions. This coordination behavior was validated by spectroscopic, magnetic, and electronic spectra using the formulas of the [M(Gpn)(H2O)3(Cl)]·nH2O complexes (where n = 2–6).Transmission electron microscopy was used to examine the nanostructure of the produced gabapentin complexes. Molecular docking was utilized to investigate the comparative interaction between the Gpn drug and its four metal [Cu(II), Ni(II), Co(II), and Mn(II)] complexes as ligands using serotonin (6BQH) and dopamine (6CM4) receptors. AutoDock Vina results were further refined through molecular dynamics simulation, and molecular processes for receptor–ligand interactions were also studied. The B3LYP level of theory and LanL2DZ basis set was used for DFT (density functional theory) studies. The optimized geometries, along with the MEP map and HOMO → LUMO of the metal complexes, were studied.
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11
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Zhukovsky D, Dar’in D, Bakulina O, Krasavin M. Preparation and Synthetic Applications of Five-to-Seven-Membered Cyclic α-Diazo Monocarbonyl Compounds. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27062030. [PMID: 35335391 PMCID: PMC8954351 DOI: 10.3390/molecules27062030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/16/2022] [Accepted: 03/16/2022] [Indexed: 11/16/2022]
Abstract
The reactivity of cyclic α-diazo monocarbonyl compounds differs from that of their acyclic counterparts. In this review, we summarize the current literature available on the synthesis and synthetic applications of three major classes of cyclic α-diazo monocarbonyl compounds: α-diazo ketones, α-diazo lactones and α-diazo lactams.
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Affiliation(s)
- Daniil Zhukovsky
- Research & Development Department, BratskChemSyntez LLC, PharmaSyntez Company, 5A/1 Kommunalnaya St., 665717 Bratsk, Russia;
| | - Dmitry Dar’in
- Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, Russia;
- Correspondence: (D.D.); (M.K.)
| | - Olga Bakulina
- Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, Russia;
| | - Mikhail Krasavin
- Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, Russia;
- Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia
- Correspondence: (D.D.); (M.K.)
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12
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Selaković Ž, Nikolić AM, Ajdačić V, Opsenica IM. Application of Transition Metal‐Catalyzed Decarbonylation of Aldehydes in the Total Synthesis of Natural Products. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Života Selaković
- Department of Organic Chemistry University of Belgrade – Faculty of Chemistry PO Box 51, Studentski trg 16 11158 Belgrade Serbia
| | - Andrea M. Nikolić
- Department of Organic Chemistry University of Belgrade – Faculty of Chemistry PO Box 51, Studentski trg 16 11158 Belgrade Serbia
| | - Vladimir Ajdačić
- Innovative Centre Faculty of Chemistry, Ltd. Studentski trg 12–16 11158 Belgrade Serbia
| | - Igor M. Opsenica
- Department of Organic Chemistry University of Belgrade – Faculty of Chemistry PO Box 51, Studentski trg 16 11158 Belgrade Serbia
- Department of Organic Chemistry University of Belgrade – Faculty of Chemistry PO Box 51, Studentski trg 16 11158 Belgrade Serbia
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13
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Teng Q, Chen D, Tung CH, Xu Z. Asymmetric synthesis of tricyclic 6,5,5-fused polycycles by desymmetric Pauson-Khand reaction. Org Chem Front 2022. [DOI: 10.1039/d1qo01878g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new rhodium(I)-BINAP-catalyzed enantioselective desymmetric Pauson-Khand (PK) reaction of prochiral 1,6-enynes with CO has been developed. Diverse tricyclic 6,5,5-fused bowl type polycycles with three continuous chiral centers were synthesized in...
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14
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Xie J, Liu X, Zhang N, Choi S, Dong G. Bidirectional Total Synthesis of Phainanoid A via Strategic Use of Ketones. J Am Chem Soc 2021; 143:19311-19316. [PMID: 34766765 DOI: 10.1021/jacs.1c11117] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Here we report the total synthesis of phainanoid A, a unique dammarane-type triterpenoid (DTT), using an unusual bidirectional synthetic strategy. It features two transition-metal-mediated highly diastereoselective transformations to access the two challenging strained ring systems that branch toward opposite directions from the tricyclic core. This work also highlights the strategic use of ketones (or enol triflates) as versatile handles for rapid growth of molecular complexity in all key transformations, which paves the way for efficient preparations of complex and biologically significant DTTs.
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Affiliation(s)
- Jiaxin Xie
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Xin Liu
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Nan Zhang
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Shinyoung Choi
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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15
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Jin DP, Gao ZP, Liu L, Cao SQ, Xu XT, Hou XW, Zheng TL, Jiang LM, Zhu DY, Wang SH. Total Synthesis of (±)-Furanether A. Org Lett 2021; 23:8843-8846. [PMID: 34730988 DOI: 10.1021/acs.orglett.1c03353] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first total synthesis of (±)-furanether A, which exhibits good antifeedant activity, has been concisely achieved in 13 linear steps. Notably, the key rigid tetracyclic skeleton containing a 1-methyl-8-oxabicyclo[3.2.1]octane moiety with two vicinal quaternary carbon centers was rapidly constructed in one step through a unique tandem C-H oxidation/oxa-[3,3] Cope rearrangement/aldol cyclization sequence.
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Affiliation(s)
- Da-Ping Jin
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Zhu-Peng Gao
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Lin Liu
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shi-Qi Cao
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xue-Tao Xu
- School of Biotechnology and Health Science, Wuyi University, Jiangmen 529020, P. R. China
| | - Xue-Wei Hou
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Tian-Lu Zheng
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Li-Ming Jiang
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Dao-Yong Zhu
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shao-Hua Wang
- School of Pharmacy, State Key Laboratory of Applied Organic Chemistry, and Collaborative Innovation Center for Northwestern Chinese Medicine, Lanzhou University, Lanzhou 730000, P. R. China
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16
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Matsuyama T, Yatabe T, Yabe T, Yamaguchi K. Heterogeneously Catalyzed Selective Decarbonylation of Aldehydes by CeO 2-Supported Highly Dispersed Non-Electron-Rich Ni(0) Nanospecies. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03375] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Takehiro Matsuyama
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takafumi Yatabe
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tomohiro Yabe
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazuya Yamaguchi
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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17
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Zhang W, Li L, Li CC. Synthesis of natural products containing highly strained trans-fused bicyclo[3.3.0]octane: historical overview and future prospects. Chem Soc Rev 2021; 50:9430-9442. [PMID: 34286715 DOI: 10.1039/d0cs01471k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Owing to high strain energy, molecules with trans-fused bicyclo[3.3.0]octane ring systems are very difficult to synthesize, and there are very few approaches to access them. Recently, a number of natural products with such ring systems have been made by the synthetic community. However, there has been no review in this field before. This review provides a systematic and comprehensive discussion on the synthesis of natural products containing trans-fused bicyclo[3.3.0]octanes and the historical context of this work. The prospects for future research in this field are also discussed. Covering the literature before 2021, this review aims to offer a helpful reference for total synthesis of highly strained natural products containing trans-fused bicyclo[3.3.0]octane ring systems.
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Affiliation(s)
- Wen Zhang
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China.
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18
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Harms V, Ravkina V, Kirschning A. Mechanistic Similarities of Sesquiterpene Cyclases PenA, Omp6/7, and BcBOT2 Are Unraveled by an Unnatural "FPP-Ether" Derivative. Org Lett 2021; 23:3162-3166. [PMID: 33826848 DOI: 10.1021/acs.orglett.1c00882] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The sesquiterpene cyclases pentalenene synthase (PenA) and two Δ6-protoilludene synthases Omp6 and Omp7 convert a FPP ether into several new tetrahydrofurano terpenoids, one of which is also formed as the main product by the sesquiterpene cyclase BcBOT2. Thus, PenA, Omp6/7, and BcBOT2 follow closely related catalytic pathways and induce similar folding of their diphosphate substrates despite low levels of amino acid sequence similarity. Some of the new terpenoids show pronounced olfactoric properties.
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Affiliation(s)
- Vanessa Harms
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | - Viktoria Ravkina
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | - Andreas Kirschning
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
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19
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Li H, Zhang J, She X. The Total Synthesis of Diquinane-Containing Natural Products. Chemistry 2021; 27:4839-4858. [PMID: 32955141 DOI: 10.1002/chem.202003741] [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: 08/12/2020] [Revised: 09/15/2020] [Indexed: 12/18/2022]
Abstract
Diquinane or bicyclo[3.3.0]octane is a conspicuous structural unit existing in the carbo-frameworks of a wide range of natural products such as alkaloids and terpenoids. These diquinane-containing molecules not merely exhibit intriguing architectures, but also showcase a broad spectrum of significant bioactivities, which draw widespread attention from the global synthetic community. During the past decade, with an aim to accomplish the total syntheses of such specified cornucopias of natural products, a variety of elegant strategies for construction of the diquinane ring system have been disclosed. In this Minireview, the achievements on this subject in the timeline from 2010 to June 2020 are demonstrated and it is discussed how the diquinane unit is strategically forged in the context of the specific target structure. In addition, impacts of the selected works to the field of natural product total synthesis is highlighted and the particular outlook of diquinane-containing natural product synthesis is provided.
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Affiliation(s)
- Huilin Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, Gansu, P. R. China
| | - Jing Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, Gansu, P. R. China
| | - Xuegong She
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, Gansu, P. R. China
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20
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Zhang W, Zhou ZX, Zhu XJ, Sun ZH, Dai WM, Li CC. Asymmetric Total Synthesis of the Highly Strained 4β-Acetoxyprobotryane-9β,15α-diol. J Am Chem Soc 2020; 142:19868-19873. [DOI: 10.1021/jacs.0c10116] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Wen Zhang
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Zi-Xiong Zhou
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xu-Jiang Zhu
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Zhang-Hua Sun
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Wei-Min Dai
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute, Department of Chemistry, Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
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21
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Chi HM, Cole CJF, Hu P, Taylor CA, Snyder SA. Total syntheses of spiroviolene and spirograterpene A: a structural reassignment with biosynthetic implications. Chem Sci 2020; 11:10939-10944. [PMID: 34094343 PMCID: PMC8162393 DOI: 10.1039/d0sc04686h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 09/26/2020] [Indexed: 01/01/2023] Open
Abstract
The recent natural product isolates spiroviolene and spirograterpene A are two relatively non-functionalized linear triquinane terpenes with a large number of structural homologies. Nevertheless, three significant areas of structural disparity exist based on their original assignments, one of which implies a key stereochemical divergence early in their respective biosyntheses. Herein, using two known bicyclic ketone intermediates, a core Pd-catalyzed Heck cyclization sequence, and several chemoselective transformations, we describe concise total syntheses of both natural product targets and propose that the structure of spiroviolene should be reassigned. As a result, these natural products possess greater homology than previously anticipated.
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Affiliation(s)
- Hyung Min Chi
- Department of Chemistry, University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Charles J F Cole
- Department of Chemistry, University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Pengfei Hu
- Department of Chemistry, University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Cooper A Taylor
- Department of Chemistry, University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Scott A Snyder
- Department of Chemistry, University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
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22
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Eggert A, Etling C, Lübken D, Saxarra M, Kalesse M. Contiguous Quaternary Carbons: A Selection of Total Syntheses. Molecules 2020; 25:molecules25173841. [PMID: 32847075 PMCID: PMC7504199 DOI: 10.3390/molecules25173841] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 08/14/2020] [Accepted: 08/18/2020] [Indexed: 12/11/2022] Open
Abstract
Contiguous quaternary carbons in terpene natural products remain a major challenge in total synthesis. Synthetic strategies to overcome this challenge will be a pivotal prerequisite to the medicinal application of natural products and their analogs or derivatives. In this review, we cover syntheses of natural products that exhibit a dense assembly of quaternary carbons and whose syntheses were uncompleted until recently. While discussing their syntheses, we not only cover the most recent total syntheses but also provide an update on the status quo of modern syntheses of complex natural products. Herein, we review (±)-canataxpropellane, (+)-waihoensene, (–)-illisimonin A and (±)-11-O-debenzoyltashironin as prominent examples of natural products bearing contiguous quaternary carbons.
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Affiliation(s)
- Alina Eggert
- Institut für Organische Chemie, Gottfried Wilhelm Leibniz University Hannover und Biomolekulares Wirkstoffzentrum (BMWZ), Schneiderberg 1B, D-30167 Hannover, Germany; (A.E.); (C.E.); (D.L.); (M.S.)
| | - Christoph Etling
- Institut für Organische Chemie, Gottfried Wilhelm Leibniz University Hannover und Biomolekulares Wirkstoffzentrum (BMWZ), Schneiderberg 1B, D-30167 Hannover, Germany; (A.E.); (C.E.); (D.L.); (M.S.)
| | - Dennis Lübken
- Institut für Organische Chemie, Gottfried Wilhelm Leibniz University Hannover und Biomolekulares Wirkstoffzentrum (BMWZ), Schneiderberg 1B, D-30167 Hannover, Germany; (A.E.); (C.E.); (D.L.); (M.S.)
- Helmholtz Zentrum für Infektionsforschung(HZI), Inhoffenstraße 7, D-38124 Braunschweig, Germany
| | - Marius Saxarra
- Institut für Organische Chemie, Gottfried Wilhelm Leibniz University Hannover und Biomolekulares Wirkstoffzentrum (BMWZ), Schneiderberg 1B, D-30167 Hannover, Germany; (A.E.); (C.E.); (D.L.); (M.S.)
| | - Markus Kalesse
- Institut für Organische Chemie, Gottfried Wilhelm Leibniz University Hannover und Biomolekulares Wirkstoffzentrum (BMWZ), Schneiderberg 1B, D-30167 Hannover, Germany; (A.E.); (C.E.); (D.L.); (M.S.)
- Helmholtz Zentrum für Infektionsforschung(HZI), Inhoffenstraße 7, D-38124 Braunschweig, Germany
- Correspondence: ; Tel.: +49-(0)511-7624688
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23
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Peng C, Arya P, Zhou Z, Snyder SA. A Concise Total Synthesis of (+)-Waihoensene Guided by Quaternary Center Analysis. Angew Chem Int Ed Engl 2020; 59:13521-13525. [PMID: 32330370 PMCID: PMC7906115 DOI: 10.1002/anie.202004177] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Indexed: 11/07/2022]
Abstract
The four contiguous all-carbon quaternary centers of waihoensene, coupled with the absence of any traditional reactive functional groups other than a single alkene, render it a particularly challenging synthetic target among angular triquinane natural products. Here, we show that its polycyclic frame can be assembled concisely by using a strategically chosen quaternary center to guide the formation of the other three through judiciously selected C-C bond formation reactions. Those events, which included a unique Conia-ene cyclization and a challenging Pauson-Khand reaction, afforded a 17-step synthesis of the molecule in enantioenriched form.
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Affiliation(s)
- Cheng Peng
- Department of Chemistry, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL, 60637, USA
| | - Piyush Arya
- Department of Chemistry, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL, 60637, USA
| | - Zhiyao Zhou
- Department of Chemistry, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL, 60637, USA
| | - Scott A Snyder
- Department of Chemistry, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL, 60637, USA
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24
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Peng C, Arya P, Zhou Z, Snyder SA. A Concise Total Synthesis of (+)‐Waihoensene Guided by Quaternary Center Analysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004177] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Cheng Peng
- Department of Chemistry University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Piyush Arya
- Department of Chemistry University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Zhiyao Zhou
- Department of Chemistry University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Scott A. Snyder
- Department of Chemistry University of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
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25
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Salzmann K, Segarra C, Albrecht M. Donor‐Flexible Bis(pyridylidene amide) Ligands for Highly Efficient Ruthenium‐Catalyzed Olefin Oxidation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kevin Salzmann
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Candela Segarra
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Martin Albrecht
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
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26
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Chen J, Wang Y, Ding Z, Kong W. Synthesis of bridged tricyclo[5.2.1.0 1,5]decanes via nickel-catalyzed asymmetric domino cyclization of enynones. Nat Commun 2020; 11:1882. [PMID: 32312990 PMCID: PMC7171102 DOI: 10.1038/s41467-020-15837-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 03/30/2020] [Indexed: 12/18/2022] Open
Abstract
The restricted availability, expense and toxicity of precious metal catalysts such as rhodium and palladium challenge the sustainability of synthetic chemistry. As such, nickel catalysts have garnered increasing attention as replacements for enyne cyclization reactions. On the other hand, bridged tricyclo[5.2.1.01,5]decanes are found as core structures in many biologically active natural products; however, the synthesis of such frameworks with high functionalities from readily available precursors remains a significant challenge. Herein, we report a nickel-catalyzed asymmetric domino cyclization reaction of enynones, providing rapid and modular synthesis of bridged tricyclo[5.2.1.01,5]decane skeletons with three quaternary stereocenters in good yields and remarkable high levels of regio- and enantioselectivities (92-99% ee).
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Affiliation(s)
- Jiachang Chen
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China
| | - Yiming Wang
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China
| | - Zhengtian Ding
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China
| | - Wangqing Kong
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China.
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27
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Salzmann K, Segarra C, Albrecht M. Donor‐Flexible Bis(pyridylidene amide) Ligands for Highly Efficient Ruthenium‐Catalyzed Olefin Oxidation. Angew Chem Int Ed Engl 2020; 59:8932-8936. [DOI: 10.1002/anie.202002014] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Indexed: 11/08/2022]
Affiliation(s)
- Kevin Salzmann
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Candela Segarra
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Martin Albrecht
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
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28
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Min L, Liu X, Li CC. Total Synthesis of Natural Products with Bridged Bicyclo[m.n.1] Ring Systems via Type II [5 + 2] Cycloaddition. Acc Chem Res 2020; 53:703-718. [PMID: 32069021 DOI: 10.1021/acs.accounts.9b00640] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Natural products containing bridged ring systems are widely identified and show significant biological activity. The development of efficient synthesis reactions and strategies to construct bridged ring systems is a long-standing but very significant challenge in organic chemistry. In 2014, our group developed a unique type II [5 + 2] cycloaddition reaction that provides a facile and direct methodology for constructing highly functionalized bridged bicyclo[4.3.1], bicyclo[4.4.1], bicyclo[5.4.1], bicyclo[6.4.1], and other bicyclo[m.n.1] systems containing a strained bridgehead double bond. In this Account, we summarize the methodology development and report the results of application of our unique strategy for the total synthesis of several natural products with bridged ring systems (i.e., cyclocitrinol, cerorubenic acid-III, and vinigrol) during the past 5 years in our laboratory. In the first part, we introduce the logic behind the design and discovery of type II [5 + 2] cycloadditions. The substrates can be easily synthesized by a modular approach, followed by base-promoted group elimination under heat to form an oxidopyrylium ylide, which can undergo cycloaddition under relatively mild conditions with a variety of double bonds to generate bridged bicyclo[m.n.1] frameworks in high yield. The diastereocontrol and unique endo selectivity of this methodology are favorable for further application to the synthesis of complex natural products. In the second part, we highlight our endeavors in the total synthesis of several different types of molecules bearing bridged ring systems using our methodology. The bridged bicyclo[4.4.1] system is the core structure of two different types of natural products, cyclocitrinol and cerorubenic acid-III, that can be efficiently constructed by type II [5 + 2] cycloadditions. The development of suitable strategies and methods for site-selective cleavage of the C-O bond of the oxa-[3.2.1] ring system in the products of type II [5 + 2] cycloadditions is also discussed and highlighted during the syntheses. Moreover, the bridged bicyclo[5.3.1] system is the core structure of vinigrol, which can be constructed through a novel ring contraction sequence of the bicyclo[5.4.1] system formed by a type II [5 + 2] cycloaddition. By combining with a ring contraction cascade, we believe that type II [5 + 2] cycloadditions have the potential to be used as a unified approach to constructing natural products containing bridged bicyclo[m.n.1] frameworks.
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Affiliation(s)
- Long Min
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Xin Liu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
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29
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Syntrivanis LD, Némethová I, Schmid D, Levi S, Prescimone A, Bissegger F, Major DT, Tiefenbacher K. Four-Step Access to the Sesquiterpene Natural Product Presilphiperfolan-1β-ol and Unnatural Derivatives via Supramolecular Catalysis. J Am Chem Soc 2020; 142:5894-5900. [DOI: 10.1021/jacs.0c01464] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
| | - Ivana Némethová
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Dario Schmid
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Shani Levi
- Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
| | - Alessandro Prescimone
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Fabian Bissegger
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Dan T. Major
- Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
| | - Konrad Tiefenbacher
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4058 Basel, Switzerland
- Department of Biosystems Science and Engineering, ETH Zurich, Mattenstrasse 24, 4058 Basel, Switzerland
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30
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Gu JH, Wang WJ, Chen JZ, Liu JS, Li NP, Cheng MJ, Hu LJ, Li CC, Ye WC, Wang L. Leptosperols A and B, Two Cinnamoylphloroglucinol-Sesquiterpenoid Hybrids from Leptospermum scoparium: Structural Elucidation and Biomimetic Synthesis. Org Lett 2020; 22:1796-1800. [PMID: 32091219 DOI: 10.1021/acs.orglett.0c00109] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Leptosperols A and B (1 and 2), two cinnamoylphloroglucinol-sesquiterpenoid hybrids featuring unprecedented 1-benzyl-2-(2-phenylethyl) cyclodecane and 2-benzyl-3-phenylethyl decahydronaphthalene backbones, along with their biosynthetic precursor (3), were isolated from Leptospermum scoparium. Compounds 1 and 2 represent the first example of phloroglucinol derivatives biogenetically constructed by a De Mayo reaction. The biomimetic synthesis of leptosperol B (2) was achieved using the proposed biosynthetic pathway. In addition, compounds 1 and 2 showed significant anti-inflammatory effects in zebrafish acute inflammatory models.
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Affiliation(s)
- Ji-Hong Gu
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China
| | - Wen-Jing Wang
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China
| | - Jun-Zi Chen
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China
| | - Jun-Shan Liu
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, People's Republic of China
| | - Ni-Ping Li
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China
| | - Min-Jing Cheng
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China.,Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, P. R. China
| | - Li-Jun Hu
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China
| | - Chuang-Chuang Li
- Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, P. R. China
| | - Wen-Cai Ye
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China
| | - Lei Wang
- Institute of Traditional Chinese Medicine & Natural Products and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou 510632, P. R. China
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31
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Yi H, Hu P, Snyder SA. Development and Elucidation of a Pd-Based Cyclization-Oxygenation Sequence for Natural Product Synthesis. Angew Chem Int Ed Engl 2020; 59:2674-2678. [PMID: 31742828 PMCID: PMC7199387 DOI: 10.1002/anie.201913730] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Indexed: 11/10/2022]
Abstract
Pd-catalyzed sequences involving oxidative addition, cyclization, and termination through intermolecular nucleophile capture have tremendous utility. Indeed, they can generate a plethora of different polycyclic structures possessing a diverse range of functionality. However, one area of deficiency for Pd0 /PdII variants is the ability to conclude them with oxygen-based species. Inspired by the recent discovery of one such reaction in the course of a total synthesis program, we delineate herein that it has significant strength, both in terms of substrate scope as well as the terminating oxygen nucleophile. As a result, the reaction proved critical in achieving total syntheses of two oxygenated natural products, one of which was prone to over-oxidation. Finally, a mechanistic proposal that accounts for its success is provided.
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Affiliation(s)
| | | | - Scott A. Snyder
- Department of Chemistry, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL 60637 (USA)
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32
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Yi H, Hu P, Snyder SA. Development and Elucidation of a Pd‐Based Cyclization–Oxygenation Sequence for Natural Product Synthesis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913730] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Heng Yi
- Department of ChemistryUniversity of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Pengfei Hu
- Department of ChemistryUniversity of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
| | - Scott A. Snyder
- Department of ChemistryUniversity of Chicago 5735 S. Ellis Avenue Chicago IL 60637 USA
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33
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Affiliation(s)
- Long Min
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xiaohong Lin
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
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34
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Burns AS, Rychnovsky SD. Total Synthesis and Structure Revision of (-)-Illisimonin A, a Neuroprotective Sesquiterpenoid from the Fruits of Illicium simonsii. J Am Chem Soc 2019; 141:13295-13300. [PMID: 31408328 DOI: 10.1021/jacs.9b05065] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Illisimonin A was isolated from Illicium simonsii and has a previously unreported tricyclic carbon framework. It displayed neuroprotective effects against oxygen-glucose deprivation-induced cell injury in SH-SY5Y cells. It incorporates a highly strained trans-pentalene ring system. We report the first synthesis of (±)-illisimonin A. Notable steps in the route include a 1,3-dioxa-2-silacyclohexene templated Diels-Alder cycloaddition and type-3 semipinacol rearrangement to generate the trans-pentalene. The final step is an iron-catalyzed C-H oxidation. The synthetic route is robust, with 94 mg of racemic material prepared in a single pass. Resolving an intermediate enabled the synthesis of natural (-)-illisimonin A. The absolute configuration of (-)-illisimonin A was revised to 1S,4S,5S,6S,7R,9R,10R based on the X-ray structure of a heavy-atom analogue.
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Affiliation(s)
- Alexander S Burns
- Department of Chemistry , University of California, Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Scott D Rychnovsky
- Department of Chemistry , University of California, Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
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35
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Richter SC, Oestreich M. Bioinspired Metal‐Free Formal Decarbonylation of α‐Branched Aliphatic Aldehydes at Ambient Temperature. Chemistry 2019; 25:8508-8512. [DOI: 10.1002/chem.201902082] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Indexed: 01/25/2023]
Affiliation(s)
- Sven C. Richter
- Institut für ChemieTechnische Universität Berlin Strasse des 17. Juni 115 10623 Berlin Germany
| | - Martin Oestreich
- Institut für ChemieTechnische Universität Berlin Strasse des 17. Juni 115 10623 Berlin Germany
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36
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Quaternary-centre-guided synthesis of complex polycyclic terpenes. Nature 2019; 569:703-707. [PMID: 31022719 DOI: 10.1038/s41586-019-1179-2] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 04/16/2019] [Indexed: 11/08/2022]
Abstract
The presence of a quaternary centre-a carbon with four other carbons bonded to it-in any given molecule can have a substantial chemical and biological impact. In many cases, it can enable otherwise challenging chemistry. For example, quaternary centres induce large rate enhancements in cyclization reactions-known as the Thorpe-Ingold effect-which has application in drug delivery for molecules with modest bioavailability1. Similarly, the addition of quaternary centres to a drug candidate can enhance both its activity and its metabolic stability2. When present in chiral ligands3, catalysts4 and auxiliaries5, quaternary centres can guide reactions toward both improved and unique regio-, stereo- and/or enantioselectivity. However, owing to their distinct steric congestion and conformational restriction, the formation of quaternary centres can be achieved reliably by only a few chemical transformations6,7. For particularly challenging cases-for example, the vicinal all-carbon8, oxa- and aza-quaternary centres9 in molecules such as azadirachtin10,11, scopadulcic acid A12,13 and acutumine14-the development of target-specific approaches as well as multiple functional-group and redox manipulations is often necessary. It is therefore desirable to establish alternative ways in which quaternary centres can positively affect and guide synthetic planning. Here we show that if a synthesis is designed such that each quaternary centre is deliberately leveraged to simplify the construction of the next-either through rate acceleration or blocking effects-then highly efficient, scalable and modular syntheses can result. This approach is illustrated using the conidiogenone family of terpenes as a representative case; however, this framework provides a distinct planning logic that is applicable to other targets of similar synthetic complexity that contain multiple quaternary centres.
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37
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Döndaş HA, Retamosa MDG, Sansano JM. Recent Development in Palladium-Catalyzed Domino Reactions: Access to Materials and Biologically Important Carbo- and Heterocycles. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00110] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- H. Ali Döndaş
- Mersin University, Faculty of Pharmacy, Yenisehir Campus 33169, Yenisehir, Mersin, Turkey
| | - María de Gracia Retamosa
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain
| | - José M. Sansano
- Departamento de Química Orgánica, Instituto de Síntesis Orgánica (ISO) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), University of Alicante, 03080 Alicante, Spain
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38
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39
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Liu X, Liu J, Wu J, Huang G, Liang R, Chung LW, Li CC. Asymmetric Total Synthesis of Cerorubenic Acid-III. J Am Chem Soc 2019; 141:2872-2877. [PMID: 30721058 DOI: 10.1021/jacs.8b12647] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The first asymmetric total synthesis of the highly strained compound cerorubenic acid-III is reported. A type II intramolecular [5 + 2] cycloaddition allowed efficient and diastereoselective construction of the synthetically challenging bicyclo[4.4.1] ring system with a strained bridgehead (anti-Bredt) double bond in the final product. A unique transannular cyclization installed the vinylcyclopropane moiety with retention of the desired stereochemistry.
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Affiliation(s)
- Xin Liu
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China.,Institute of Chinese Medical Sciences , University of Macau , Macau , China
| | - Junyang Liu
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China.,Academy for Advanced Interdisciplinary Studies , Southern University of Science and Technology (SUSTech) , Shenzhen 518055 , China
| | - Jianlei Wu
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Guocheng Huang
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Rong Liang
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute, Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , China
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40
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Iyori Y, Takahashi K, Yamazaki K, Ano Y, Chatani N. Nickel-catalyzed reductive defunctionalization of esters in the absence of an external reductant: activation of C–O bonds. Chem Commun (Camb) 2019; 55:13610-13613. [DOI: 10.1039/c9cc07710c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The nickel-catalyzed reductive cleavage of esters in the absence of an external reductant, which involves the cleavage of an inert acyl C–O bond in O-alkyl esters is reported.
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Affiliation(s)
- Yasuaki Iyori
- Department of Applied Chemistry
- Faculty of Engineering
- Osaka University
- Suita
- Japan
| | - Kenjiro Takahashi
- Department of Applied Chemistry
- Faculty of Engineering
- Osaka University
- Suita
- Japan
| | - Ken Yamazaki
- Department of Applied Chemistry
- Faculty of Engineering
- Osaka University
- Suita
- Japan
| | - Yusuke Ano
- Department of Applied Chemistry
- Faculty of Engineering
- Osaka University
- Suita
- Japan
| | - Naoto Chatani
- Department of Applied Chemistry
- Faculty of Engineering
- Osaka University
- Suita
- Japan
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41
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Oberhauser C, Harms V, Seidel K, Schröder B, Ekramzadeh K, Beutel S, Winkler S, Lauterbach L, Dickschat JS, Kirschning A. Exploiting the Synthetic Potential of Sesquiterpene Cyclases for Generating Unnatural Terpenoids. Angew Chem Int Ed Engl 2018; 57:11802-11806. [DOI: 10.1002/anie.201805526] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 06/22/2018] [Indexed: 01/26/2023]
Affiliation(s)
- Clara Oberhauser
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ)Leibniz Universität Hannover Schneiderberg 1B 30167 Hannover Germany
| | - Vanessa Harms
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ)Leibniz Universität Hannover Schneiderberg 1B 30167 Hannover Germany
| | - Katja Seidel
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ)Leibniz Universität Hannover Schneiderberg 1B 30167 Hannover Germany
| | - Benjamin Schröder
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ)Leibniz Universität Hannover Schneiderberg 1B 30167 Hannover Germany
| | - Kimia Ekramzadeh
- Institute of Technical Chemistry and Center of Biomolecular Drug Research (BMWZ)Leibniz Universität Hannover Callinstr. 5 30167 Hannover Germany
| | - Sascha Beutel
- Institute of Technical Chemistry and Center of Biomolecular Drug Research (BMWZ)Leibniz Universität Hannover Callinstr. 5 30167 Hannover Germany
| | - Sven Winkler
- Symrise AG Mühlenfeldstrasse 1 37603 Holzminden Germany
| | - Lukas Lauterbach
- Kekulé-Institute of Organic Chemistry and BiochemistryUniversity of Bonn Gerhard-Domagk-Straße 1 53121 Bonn Germany
| | - Jeroen S. Dickschat
- Kekulé-Institute of Organic Chemistry and BiochemistryUniversity of Bonn Gerhard-Domagk-Straße 1 53121 Bonn Germany
| | - Andreas Kirschning
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ)Leibniz Universität Hannover Schneiderberg 1B 30167 Hannover Germany
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42
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Oberhauser C, Harms V, Seidel K, Schröder B, Ekramzadeh K, Beutel S, Winkler S, Lauterbach L, Dickschat JS, Kirschning A. Erweiterung des synthetischen Potenzials von Sesquiterpencyclasen zur Erzeugung von nichtnatürlichen Terpenoiden. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805526] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Clara Oberhauser
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ); Leibniz Universität Hannover; Schneiderberg 1B 30167 Hannover Deutschland
| | - Vanessa Harms
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ); Leibniz Universität Hannover; Schneiderberg 1B 30167 Hannover Deutschland
| | - Katja Seidel
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ); Leibniz Universität Hannover; Schneiderberg 1B 30167 Hannover Deutschland
| | - Benjamin Schröder
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ); Leibniz Universität Hannover; Schneiderberg 1B 30167 Hannover Deutschland
| | - Kimia Ekramzadeh
- Institut für Technische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ); Leibniz Universität Hannover; Callinstr. 5 30167 Hannover Deutschland
| | - Sascha Beutel
- Institut für Technische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ); Leibniz Universität Hannover; Callinstr. 5 30167 Hannover Deutschland
| | - Sven Winkler
- Symrise AG; Mühlenfeldstraße 1 37603 Holzminden Deutschland
| | - Lukas Lauterbach
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Deutschland
| | - Jeroen S. Dickschat
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Deutschland
| | - Andreas Kirschning
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ); Leibniz Universität Hannover; Schneiderberg 1B 30167 Hannover Deutschland
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43
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Abstract
This review highlights the use of the bisphosphine ligand group in homogeneous catalysis.
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44
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Yu J, Zhang Z, Zhou S, Zhang W, Tong R. Evolution of two routes for asymmetric total synthesis of tetrahydroprotoberberine alkaloids. Org Chem Front 2018. [DOI: 10.1039/c7qo00776k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Two routes were developed for the catalytic asymmetric total synthesis of tetrahydroprotoberberine alkaloids.
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Affiliation(s)
- Jingxun Yu
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
| | - Zhihong Zhang
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
| | - Shiqiang Zhou
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
| | - Wei Zhang
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
| | - Rongbiao Tong
- Department of Chemistry
- Hong Kong University of Science and Technology
- Kowloon
- China
- HKUST Shenzhen Research Institute
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45
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Ye Q, Qu P, Snyder SA. Total Syntheses of Scaparvins B, C, and D Enabled by a Key C-H Functionalization. J Am Chem Soc 2017; 139:18428-18431. [PMID: 29227651 DOI: 10.1021/jacs.7b06185] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The clerodane diterpene family possesses an impressive range of bioactivities and high synthetic challenge due to their unique amalgamation of rings, stereocenters, and oxygenation. Herein, we disclose the first total syntheses of three members, scaparvins B, C, and D, through a route fueled by several chemoselective and carefully orchestrated steps. One such operation is a tailored late-stage C-H functionalization converting a carboxylic acid into a lactone through the oxidation of a tertiary C-H bond under conditions that minimize epoxidation of an alkene. This step, among others, afforded critical functionality to complete the targets. In addition, use of an appropriate chiral catalyst with a Rawal diene renders the sequence enantioselective.
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Affiliation(s)
- Qinda Ye
- Department of Chemistry, Columbia University , 3000 Broadway, New York, New York 10027, United States.,Department of Chemistry, The Scripps Research Institute , 130 Scripps Way, Jupiter, Florida 33458, United States.,Department of Chemistry, University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Pei Qu
- Department of Chemistry, University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Scott A Snyder
- Department of Chemistry, Columbia University , 3000 Broadway, New York, New York 10027, United States.,Department of Chemistry, The Scripps Research Institute , 130 Scripps Way, Jupiter, Florida 33458, United States.,Department of Chemistry, University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
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46
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Saladrigas M, Bosch C, Saborit GV, Bonjoch J, Bradshaw B. Radical Cyclization of Alkene-Tethered Ketones Initiated by Hydrogen-Atom Transfer. Angew Chem Int Ed Engl 2017; 57:182-186. [DOI: 10.1002/anie.201709659] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Indexed: 02/04/2023]
Affiliation(s)
- Mar Saladrigas
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Caroline Bosch
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Gisela V. Saborit
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Josep Bonjoch
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Ben Bradshaw
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
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47
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Saladrigas M, Bosch C, Saborit GV, Bonjoch J, Bradshaw B. Radical Cyclization of Alkene-Tethered Ketones Initiated by Hydrogen-Atom Transfer. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709659] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Mar Saladrigas
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Caroline Bosch
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Gisela V. Saborit
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Josep Bonjoch
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
| | - Ben Bradshaw
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB; Universitat de Barcelona; Av. Joan XXIII s/n 08028- Barcelona Spain
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