1
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Yu J, Guo H, Zhang J, Hu J, He H, Chen C, Yang N, Yang F, Lin Z, Dai H, Ouyang L, Liu C, Lei X, Zhang L, Zhu G, Song F. Chrysomycins, Anti-Tuberculosis C-Glycoside Polyketides from Streptomyces sp. MS751. Mar Drugs 2024; 22:259. [PMID: 38921570 PMCID: PMC11204892 DOI: 10.3390/md22060259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Revised: 05/25/2024] [Accepted: 05/26/2024] [Indexed: 06/27/2024] Open
Abstract
A new dimeric C-glycoside polyketide chrysomycin F (1), along with four new monomeric compounds, chrysomycins G (2), H (3), I (4), J (5), as well as three known analogues, chrysomycins A (6), B (7), and C (8), were isolated and characterised from a strain of Streptomyces sp. obtained from a sediment sample collected from the South China Sea. Their structures were determined by detailed spectroscopic analysis. Chrysomycin F contains two diastereomers, whose structures were further elucidated by a biomimetic [2 + 2] photodimerisation of chrysomycin A. Chrysomycins B and C showed potent anti-tuberculosis activity against both wild-type Mycobacterium tuberculosis and a number of clinically isolated MDR M. tuberculosis strains.
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Affiliation(s)
- Jiaming Yu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Hui Guo
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Jing Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Jiansen Hu
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hongtao He
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Caixia Chen
- Technology Transfer Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Na Yang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Fan Yang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Zexu Lin
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Huanqin Dai
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Liming Ouyang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Cuihua Liu
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Xiaoguang Lei
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Lixin Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Guoliang Zhu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Fuhang Song
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- Key Laboratory of Geriatric Nutrition and Health, Ministry of Education of China; School of Light Industry, Beijing Technology and Business University, Beijing 100048, China
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2
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Viesser RV, Donald CP, May JA, Wu JI. Can Twisted Double Bonds Facilitate Stepwise [2 + 2] Cycloadditions? Org Lett 2024; 26:3778-3783. [PMID: 38684005 DOI: 10.1021/acs.orglett.4c00879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Computational studies for a series of low to high strain anti-Bredt alkenes suggest that those with highly twisted bridgehead double bonds and a small singlet-triplet energy gap may undergo facile stepwise [2 + 2] cycloadditions to furnish four membered rings. A selection of reaction substrates, including ethylene, acetylene, perfluoroethylene, and cyclooctyne are considered.
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Affiliation(s)
- Renan V Viesser
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Clayton P Donald
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Jeremy A May
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Judy I Wu
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
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3
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Sosa MB, Leeman JT, Washington LJ, Scheller HV, Chang MCY. Biosynthesis of Strained Amino Acids by a PLP-Dependent Enzyme through Cryptic Halogenation. Angew Chem Int Ed Engl 2024:e202319344. [PMID: 38519422 DOI: 10.1002/anie.202319344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 03/02/2024] [Accepted: 03/18/2024] [Indexed: 03/24/2024]
Abstract
Amino acids (AAs) are modular building blocks which nature uses to synthesize both macromolecules, such as proteins, and small molecule natural products, such as alkaloids and non-ribosomal peptides. While the 20 main proteinogenic AAs display relatively limited side chain diversity, a wide range of non-canonical amino acids (ncAAs) exist that are not used by the ribosome for protein synthesis, but contain a broad array of structural features and functional groups. In this communication, we report the discovery of the biosynthetic pathway for a new ncAA, pazamine, which contains a cyclopropane ring formed in two steps. In the first step, a chlorine is added onto the C4 position of lysine by a radical halogenase, PazA. The cyclopropane ring is then formed in the next step by a pyridoxal-5'-phosphate-dependent enzyme, PazB, via an SN2-like attack at C4 to eliminate chloride. Genetic studies of this pathway in the native host, Pseudomonas azotoformans, show that pazamine potentially inhibits ethylene biosynthesis in growing plants based on alterations in the root phenotype of Arabidopsis thaliana seedlings. We further show that PazB can be utilized to make an alternative cyclobutane-containing AA. These discoveries may lead to advances in biocatalytic production of specialty chemicals and agricultural biotechnology.
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Affiliation(s)
- Max B Sosa
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720-1460, USA
| | - Jacob T Leeman
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720-1460, USA
| | - Lorenzo J Washington
- Department of Plant & Microbial Biology, University of California, Berkeley, Berkeley, CA 94720-3102, USA
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Henrik V Scheller
- Department of Plant & Microbial Biology, University of California, Berkeley, Berkeley, CA 94720-3102, USA
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Michelle C Y Chang
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720-1460, USA
- Department of Chemical & Biomolecular Engineering, University of California, Berkeley, Berkeley, CA 94720-1462, USA
- Department of Molecular & Cell Biology, University of California, Berkeley, Berkeley, CA 94720-3200, USA
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4
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Sosa MB, Leeman JT, Washington LJ, Scheller HV, Chang MCY. Biosynthesis of Strained Amino Acids Through a PLP-Dependent Enzyme via Cryptic Halogenation. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.12.13.571568. [PMID: 38168212 PMCID: PMC10760155 DOI: 10.1101/2023.12.13.571568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Amino acids (AAs) are modular and modifiable building blocks which nature uses to synthesize both macromolecules, such as proteins, and small molecule natural products, such as alkaloids and non-ribosomal peptides (NRPs). While the 20 main proteinogenic AAs display relatively limited side-chain diversity, a wide range of non-canonical amino acids (ncAAs) exist that are not used by the ribosome for protein synthesis but contain a broad array of structural features and functional groups not found in proteinogenic AAs. In this communication, we report the discovery of the biosynthetic pathway for a new ncAA, pazamine, which contains a cyclopropane ring formed in two steps. In the first step, a chlorine is added onto the C4 position of lysine by a radical halogenase PazA. The cyclopropane ring is then formed in the next step by a pyridoxal-5'-phosphate-dependent enzyme, PazB, via an SN2-like attack onto C4 to eliminate chloride. Genetic studies of this pathway in the native host, Pseudomonas azotoformans, show that pazamine and its succinylated derivative, pazamide, potentially inhibit ethylene biosynthesis in growing plants based on alterations in the root phenotype of Arabidopsis thaliana seedlings. We further show that PazB can be utilized to make an alternative cyclobutane-containing AA. These discoveries may lead to advances in biocatalytic production of specialty chemicals and agricultural biotechnology.
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Affiliation(s)
- Max B Sosa
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
| | - Jacob T Leeman
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
| | - Lorenzo J Washington
- Department of Plant & Microbial Biology, University of California, Berkeley, Berkeley, CA 94720 and Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Henrik V Scheller
- Department of Plant & Microbial Biology, University of California, Berkeley, Berkeley, CA 94720 and Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Michelle C Y Chang
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA and Department of Chemical & Biomolecular Engineering, University of California, Berkeley, Berkeley, CA 94720 USA and Department of Molecular & Cell Biology, University of California, Berkeley, Berkeley, CA 94720 USA
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5
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Liang C, Zang J, Ndi C, Semple SJ, Buirchell B, Coriani S, Møller BL, Staerk D. Identification of new PTP1B-inhibiting decipiene diterpenoid esters from Eremophila clarkei by high-resolution PTP1B inhibition profiling, enzyme kinetics analysis, and molecular docking. Bioorg Chem 2023; 139:106744. [PMID: 37517158 DOI: 10.1016/j.bioorg.2023.106744] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 07/03/2023] [Accepted: 07/17/2023] [Indexed: 08/01/2023]
Abstract
In this study, an extract of the leaves of Eremophila clarkei Oldfield & F.Muell. showed protein tyrosine phosphatase 1B (PTP1B) inhibitory activity with an IC50 value of 33.0 μg/mL. The extract was therefore investigated by high-resolution PTP1B inhibition profiling to pinpoint the constituents responsible for the activity. Subsequent isolation and purification using analytical-scale HPLC led to identification of eight previously undescribed decipiene diterpenoids, eremoclarkanes A-H, as well as eremoclarkic acid, a biogenetically related new phenolic acid. In addition, one known decipiene diterpenoid and ten known O-methylated flavonoids were isolated. The structures of the isolated compounds were elucidated by extensive analysis of their HRMS and 1D and 2D NMR spectra. The absolute configuration of decipiene diterpenoids was determined by comparison of experimental and calculated ECD spectra. The flavonoid hispidulin (2b) and the four decipiene diterpenoids 13a, 13b, 13f, and 14b exhibited PTP1B inhibitory activity with IC50 values ranging from 22.8 to 33.6 μM. This is the first report of PTP1B inhibitory activity of decipienes, and enzyme kinetics revealed that 13a and 13b are competitive inhibitors of PTP1B, whereas 13f and 14b displayed mixed-type-mode inhibition of PTP1B. Finally, molecular docking indicated that 13a, 13b, 13f, and 14b showed comparable binding affinity towards the active and/or allosteric site of PTP1B enzyme. Structure-activity relationship (SAR) of the identified O-methylated flavonoids and decipiene diterpenoids towards PTP1B is discussed. Plausible enzymatic and photochemically driven routes for the formation of the decipienes and conversion products thereof are presented and discussed.
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Affiliation(s)
- Chao Liang
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Jie Zang
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Chi Ndi
- Quality Use of Medicines and Pharmacy Research Centre, Clinical and Health Sciences, University of South Australia, Frome Road, Adelaide 5000, Australia
| | - Susan J Semple
- Quality Use of Medicines and Pharmacy Research Centre, Clinical and Health Sciences, University of South Australia, Frome Road, Adelaide 5000, Australia
| | - Bevan Buirchell
- Wise Owl Consulting, Como, Western Australia 6152, Australia
| | - Sonia Coriani
- Department of Chemistry, Technical University of Denmark, Kemitorvet Building 207, DK-2800 Kongens Lyngby, Denmark
| | - Birger Lindberg Møller
- Plant Biochemistry Laboratory, Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
| | - Dan Staerk
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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6
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Nakano M, Gemma R, Sato H. Unraveling the role of prenyl side-chain interactions in stabilizing the secondary carbocation in the biosynthesis of variexenol B. Beilstein J Org Chem 2023; 19:1503-1510. [PMID: 37799177 PMCID: PMC10548252 DOI: 10.3762/bjoc.19.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 09/07/2023] [Indexed: 10/07/2023] Open
Abstract
Terpene cyclization reactions involve a number of carbocation intermediates. In some cases, these carbocations are stabilized by through-space interactions with π orbitals. Several terpene/terpenoids, such as sativene, santalene, bergamotene, ophiobolin and mangicol, possess prenyl side chains that do not participate in the cyclization reaction. The role of these prenyl side chains has been partially investigated, but remains elusive in the cyclization cascade. In this study, we focus on variexenol B that is synthesized from iso-GGPP, as recently reported by Dickschat and co-workers, and investigate the possibility of through-space interactions with prenyl side chains using DFT calculations. Our calculations show that (i) the unstable secondary carbocation is stabilized by the cation-π interaction from prenyl side chains, thereby lowering the activation energy, (ii) the four-membered ring formation is completed through bridging from the exomethylene group, and (iii) the annulation from the exomethylene group proceeds in a barrier-free manner.
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Affiliation(s)
- Moe Nakano
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-4-37 Takeda, Kofu, Yamanashi 400-8510, Japan
| | - Rintaro Gemma
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-4-37 Takeda, Kofu, Yamanashi 400-8510, Japan
| | - Hajime Sato
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-4-37 Takeda, Kofu, Yamanashi 400-8510, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332–0012, Japan
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7
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Monreal-Corona R, Solà M, Pla-Quintana A, Poater A. Stereoretentive Formation of Cyclobutanes from Pyrrolidines: Lessons Learned from DFT Studies of the Reaction Mechanism. J Org Chem 2023; 88:4619-4626. [PMID: 36940389 PMCID: PMC10088030 DOI: 10.1021/acs.joc.3c00080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023]
Abstract
The stereoselective synthesis of cyclobutanes that possess an array of stereocenters in a contiguous fashion has attracted the wide interest of the synthetic community. Cyclobutanes can be generated from the contraction of pyrrolidines through the formation of 1,4-biradical intermediates. Little else is known about the reaction mechanism of this reaction. Here, we unveil the mechanism for this stereospecific synthesis of cyclobutanes by means of density functional theory (DFT) calculations. The rate-determining step of this transformation corresponds to the release of N2 from the 1,1-diazene intermediate to form an open-shell singlet 1,4-biradical. The formation of the stereoretentive product is explained by the barrierless collapse of this open-shell singlet 1,4-biradical. The knowledge of the reaction mechanism is used to predict that the methodology could be amenable to the synthesis of [2]-ladderanes and bicyclic cyclobutanes.
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Affiliation(s)
- Roger Monreal-Corona
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Anna Pla-Quintana
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
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8
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He Y, Wang H, Yang Y, Yan H. Visible light-catalyzed intermolecular [2+2] cycloaddition of 1,2-dihydropyridines: A combined experimental and DFT study. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
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9
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Wang H, Zou Y, Li M, Tang Z, Wang J, Tian Z, Strassner N, Yang Q, Zheng Q, Guo Y, Liu W, Pan L, Houk KN. A cyclase that catalyses competing 2 + 2 and 4 + 2 cycloadditions. Nat Chem 2023; 15:177-184. [PMID: 36690833 DOI: 10.1038/s41557-022-01104-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 11/01/2022] [Indexed: 01/24/2023]
Abstract
Cycloaddition reactions are among the most widely used reactions in chemical synthesis. Nature achieves these cyclization reactions with a variety of enzymes, including Diels-Alderases that catalyse concerted 4 + 2 cycloadditions, but biosynthetic enzymes with 2 + 2 cyclase activity have yet to be discovered. Here we report that PloI4, a β-barrel-fold protein homologous to the exo-selective 4 + 2 cyclase that functions in the biosynthesis of pyrroindomycins, catalyses competitive 2 + 2 and 4 + 2 cycloaddition reactions. PloI4 is believed to catalyse an endo-4 + 2 cycloaddition in the biosynthesis of pyrrolosporin A; however, when the substrate precursor of pyrroindomycins was treated with PloI4, an exo-2 + 2 adduct was produced in addition to the exo- and endo-4 + 2 adducts. Biochemical characterizations, computational analyses, (co)crystal structures and mutagenesis outcomes have allowed the catalytic versatility of PloI4 to be rationalized. Mechanistic studies involved the directed engineering of PloI4 to variants that produced the exo-4 + 2, endo-4 + 2 or exo-2 + 2 product preferentially. This work illustrates an enzymatic thermal 2 + 2 cycloaddition and provides evidence of a process through which an enzyme evolves along with its substrate for specialization and activity improvement.
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Affiliation(s)
- Hongbo Wang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China
| | - Yike Zou
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Miao Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China.,School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
| | - Zhijun Tang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China
| | - Jiabao Wang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China.,Department of Chemistry, Shanghai Normal University, Shanghai, China
| | - Zhenhua Tian
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China.,Abiochem Biotechnology Co., Ltd, Shanghai, China
| | - Nina Strassner
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Qian Yang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China
| | - Qingfei Zheng
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China
| | - Yujiao Guo
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China
| | - Wen Liu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China. .,Department of Chemistry, Shanghai Normal University, Shanghai, China.
| | - Lifeng Pan
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China. .,School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China.
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
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10
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Yang P, Jia Q, Song S, Huang X. [2 + 2]-Cycloaddition-derived cyclobutane natural products: structural diversity, sources, bioactivities, and biomimetic syntheses. Nat Prod Rep 2023. [DOI: 10.1039/d2np00034b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review summarizes the structural diversity, bioactivities, and biomimetic synthesis of [2 + 2]-type cyclobutane natural products, along with discussion of their biosynthesis, stereochemical analysis, racemic occurrence, and biomimetic synthesis.
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Affiliation(s)
- Peiyuan Yang
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
| | - Qi Jia
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
| | - Shaojiang Song
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
| | - Xiaoxiao Huang
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
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11
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Hui C, Antonchick AP. Concise synthesis of piperarborenine B. Bioorg Med Chem 2022; 67:116817. [PMID: 35609467 DOI: 10.1016/j.bmc.2022.116817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/07/2022] [Accepted: 05/09/2022] [Indexed: 11/24/2022]
Abstract
A concise synthesis of piperarborenine B is reported. Organocatalytic electrophilic amination of pyrrolidines, stereospecific oxidative ring contraction and an original diastereoselective Krapcho dealkoxycarbonylation/transmethylation contribute to a novel synthetic strategy to the preparation of a non-symmetrical cyclobutane core. Being transition-metal-free, directing-group-free and protecting-group-free, a five-step synthesis of piperarborenine B was accomplished.
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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
| | - 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, United Kingdom.
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12
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Hui C, Wang Z, Xie Y, Liu J. Contemporary synthesis of bioactive cyclobutane natural products. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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13
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Zanini M, Cataffo A, Echavarren AM. Synthesis of Cyclobutanones by Gold(I)-Catalyzed [2 + 2] Cycloaddition of Ynol Ethers with Alkenes. Org Lett 2021; 23:8989-8993. [PMID: 34730987 DOI: 10.1021/acs.orglett.1c03499] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A broad scope synthesis of cyclobutanones by gold(I)-catalyzed [2 + 2] cycloaddition of ynol ethers with alkenes has been developed. We also found that internal aryl ynol ethers can undergo (4 + 2) cycloaddition reaction with alkenes leading to the corresponding chromanes.
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Affiliation(s)
- Margherita Zanini
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain.,Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·li Domingo s/n, 43007 Tarragona, Spain
| | - Andrea Cataffo
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain.,Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·li Domingo s/n, 43007 Tarragona, Spain
| | - Antonio M Echavarren
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain.,Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·li Domingo s/n, 43007 Tarragona, Spain
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14
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Hui C, Brieger L, Strohmann C, Antonchick AP. Stereoselective Synthesis of Cyclobutanes by Contraction of Pyrrolidines. J Am Chem Soc 2021; 143:18864-18870. [PMID: 34748319 PMCID: PMC8603356 DOI: 10.1021/jacs.1c10175] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Here we report a contractive synthesis of multisubstituted cyclobutanes containing multiple stereocenters from readily accessible pyrrolidines using iodonitrene chemistry. Mediated by a nitrogen extrusion process, the stereospecific synthesis of cyclobutanes involves a radical pathway. Unprecedented unsymmetrical spirocyclobutanes were prepared successfully, and a concise, formal synthesis of the cytotoxic natural product piperarborenine B is reported.
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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
| | - Lukas Brieger
- Technical University Dortmund, Faculty of Chemistry and Chemical Biology, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | - Carsten Strohmann
- Technical University Dortmund, Faculty of Chemistry and Chemical Biology, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | - 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, United Kingdom
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15
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Gangu KK, Tharividi SG, Kerru N, Jonnalagadda SB. Excellent Catalytic Activity of Two Cd(II) Metal‐Organic Frameworks in The Synthesis of Benzothiazolo‐Pyrimidines. ChemistrySelect 2021. [DOI: 10.1002/slct.202103536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kranthi Kumar Gangu
- Vignan's Institute of Information Technology, Duvvada Visakhapatnam 530049 India
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus, Private Bag X54001 Durban 4000 South Africa
| | - Satya Guru Tharividi
- Vignan's Institute of Information Technology, Duvvada Visakhapatnam 530049 India
| | - Nagaraju Kerru
- Department of Chemistry GITAM University Bengaluru Karnataka 561203 India
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus, Private Bag X54001 Durban 4000 South Africa
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus, Private Bag X54001 Durban 4000 South Africa
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16
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de Moraes MM, Kato MJ. Biosynthesis of Pellucidin A in Peperomia pellucida (L.) HBK. FRONTIERS IN PLANT SCIENCE 2021; 12:641717. [PMID: 33828573 PMCID: PMC8020151 DOI: 10.3389/fpls.2021.641717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 02/22/2021] [Indexed: 05/08/2023]
Abstract
Peperomia pellucida (L.) HBK (Piperaceae) ("jabuti herb") is an herbaceous plant that is widespread in the tropics and has several ethnomedicinal uses. The phytochemical study of leaf extracts resulted in the isolation of 2,4,5-trimethoxycinnamic acid, 5,6,7-trimethoxyflavone, 2,4,5-trimethoxystyrene, 2,4,5-trimethoxybenzaldehyde, dillapiol, and sesamin in addition to pellucidin A. The co-occurrence of styrene and cyclobutane dimers suggested the formation of pellucidin A by a photochemical [2+2] cycloaddition of two molecules of 2,4,5-trimethoxystyrene. To investigate this biogenesis, analysis of plant leaves throughout ontogeny and treatments such as drought, herbivory and, exposure to jasmonic acid and UV365 light were carried out. Significant increases in the content of dillapiol (up to 86.0%) were found when P. pellucida plants were treated with jasmonic acid, whereas treatment under UV365 light increase the pellucidin A content (193.2%). The biosynthetic hypothesis was examined by feeding various 13C-labeled precursors, followed by analysis with GC-MS, which showed incorporation of L-(2-13C)-phenylalanine (0.72%), (8-13C)-cinnamic acid (1.32%), (8-13C)-ferulic acid (0.51%), (8-13C)-2,4,5-trimethoxycinnamic acid (7.5%), and (8-13C)-2,4,5-trimethoxystyrene (12.8%) into pellucidin A. The enzymatic conversion assays indicated decarboxylation of 2,4,5-trimethoxycinnamic acid into 2,4,5-trimethoxystyrene, which was subsequently dimerized into pellucidin A under UV light. Taken together, the biosynthesis of pellucidin A in P. pellucida involves a sequence of reactions starting with L-phenylalanine, cinnamic acid, ferulic acid, 2,4,5-trimethoxycinnamic acid, which then decarboxylates to form 2,4,5-trimethoxystyrene and then is photochemically dimerized to produce pellucidin A.
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Affiliation(s)
| | - Massuo J. Kato
- Institute of Chemistry, University of São Paulo, São Paulo, Brazil
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17
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Schuppe AW, Liu Y, Newhouse TR. An invocation for computational evaluation of isomerization transforms: cationic skeletal reorganizations as a case study. Nat Prod Rep 2021; 38:510-527. [PMID: 32931541 PMCID: PMC7956923 DOI: 10.1039/d0np00005a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Covering: 2010 to 2020This review article describes how cationic rearrangement reactions have been used in natural product total synthesis over the last decade as a case study for the many productive ways by which isomerization reactions are enabling for synthesis. This review argues that isomerization reactions in particular are well suited for computational evaluation, as relatively simple calculations can provide significant insight.
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Affiliation(s)
- Alexander W Schuppe
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06511-8107, USA.
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18
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Abstract
Four carbon ring systems are frequently present in natural products with remarkable biological activities such as terpenoids, alkaloids, and steroids. The development of new strategies for the assembly of these structures in a rapid and efficient manner has attracted the interest of synthetic chemists for a long time. The current research is focused mainly on the development of synthetic methods that can be performed under mild reaction conditions with a high tolerance to functional groups. In recent years, gold complexes have turned into excellent candidates for this aim, owing to their high reactivity, and are thus capable of promoting a wide range of transformations under mild conditions. Their remarkable efficiency has been thoroughly demonstrated in the synthesis of complex organic molecules from simple starting materials. This review summarizes the main synthetic strategies described for gold-catalyzed four-carbon ring formation, as well as their application in the synthesis of natural products.
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19
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García-Valdivia AA, Zabala-Lekuona A, Goñi-Cárdenas A, Fernández B, García JA, Quílez del Moral JF, Cepeda J, Rodríguez-Diéguez A. Dilution effect on the slow relaxation of a luminescent dysprosium Metal-Organic Framework based on 2,5-dihydroxyterephthalic acid. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119687] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Bai M, Feng Z, Li J, Tantillo DJ. Bouncing off walls - widths of exit channels from shallow minima can dominate selectivity control. Chem Sci 2020; 11:9937-9944. [PMID: 34094255 PMCID: PMC8162169 DOI: 10.1039/d0sc04036c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A selectivity model based on the widths of pathways to competing products, rather than barrier heights, is formulated for the butadiene + allyl cation reaction. This model was arrived at via analysis of stationary points, intrinsic reaction coordinates, potential energy surface shapes and direct dynamics trajectories, all determined using quantum chemical methods.
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Affiliation(s)
- Mengna Bai
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University No. 55 Daxuecheng South Rd., Shapingba Chongqing 401331 China.,Department of Chemistry, University of California Davis One Shields Avenue Davis CA 95616 USA
| | - Zhitao Feng
- Department of Chemistry, University of California Davis One Shields Avenue Davis CA 95616 USA
| | - Jun Li
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University No. 55 Daxuecheng South Rd., Shapingba Chongqing 401331 China
| | - Dean J Tantillo
- Department of Chemistry, University of California Davis One Shields Avenue Davis CA 95616 USA
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21
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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
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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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22
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Lee S, Goodman JM. Rapid Route-Finding for Bifurcating Organic Reactions. J Am Chem Soc 2020; 142:9210-9219. [DOI: 10.1021/jacs.9b13449] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sanha Lee
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Jonathan M. Goodman
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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23
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Kleks G, Duffy S, Lucantoni L, Avery VM, Carroll AR. Orthoscuticellines A-E, β-Carboline Alkaloids from the Bryozoan Orthoscuticella ventricosa Collected in Australia. JOURNAL OF NATURAL PRODUCTS 2020; 83:422-428. [PMID: 31961680 DOI: 10.1021/acs.jnatprod.9b00933] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Antiplasmodial high-throughput screening of extracts derived from marine invertebrates collected from northern NSW, Australia, resulted in the methanol extract of the bryozoan Orthoscuticella ventricosa being identified as inhibitory toward the 3D7 strain of Plasmodium falciparum. Purification of this extract resulted in two new bis-β-carbolines that possess a cyclobutane moiety, orthoscuticellines A and B (1 and 2), three new β-carboline alkaloids, orthoscuticellines C-E (3-5), and six known compounds, 1-ethyl-4-methylsulfone-β-carboline (6), 1-ethyl-β-carboline (7), 1-acetyl-β-carboline (8) 1-(1'-hydroxyethyl)-β-carboline (9), 1-methoxycarbonyl-β-carboline (10), and 1-vinyl-β-carboline (11). The structures of all compounds were determined from analysis of MS and 1D and 2D NMR data. The compounds showed modest antiplasmodial activity against P. falciparum in the range of 12-21 μM.
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Affiliation(s)
- Guy Kleks
- Environmental Futures Research Institute , Griffith University , Gold Coast , QLD 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Sandra Duffy
- Discovery Biology, Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Leonardo Lucantoni
- Discovery Biology, Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Vicky M Avery
- Discovery Biology, Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Anthony R Carroll
- Environmental Futures Research Institute , Griffith University , Gold Coast , QLD 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
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24
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Aitken DJ, Frongia A, Secci F. Discoveries through Organocatalyzed, Brønsted Acid Catalyzed and Non-Catalyzed Transformations of 2-Hydroxycyclobutanone. VIETNAM JOURNAL OF CHEMISTRY 2020. [DOI: 10.1002/vjch.201900176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- David J. Aitken
- CP3A Organic Synthesis Group, ICMMO, CNRS UMR 8182, Université Paris Sud, Université Paris Saclay; 15 rue Georges Clemenceau 91405 Orsay Cedex France
| | - Angelo Frongia
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato; S.S. 554, Bivio per Sestu, I-09042 Monserrato Cagliari Italy
| | - Francesco Secci
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato; S.S. 554, Bivio per Sestu, I-09042 Monserrato Cagliari Italy
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25
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Sato H, Mitsuhashi T, Yamazaki M, Abe I, Uchiyama M. Inherent atomic mobility changes in carbocation intermediates during the sesterterpene cyclization cascade. Beilstein J Org Chem 2019; 15:1890-1897. [PMID: 31467610 PMCID: PMC6693403 DOI: 10.3762/bjoc.15.184] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 07/22/2019] [Indexed: 12/19/2022] Open
Abstract
We previously showed that the regio- and stereoselectivity in terpene-forming reactions are determined by the conformations of the carbocation intermediates, which reflect the initial conformation of the substrate, geranylfarnesyl diphosphate (GFPP). However, it remains unclear how the initial conformation of GFPP is controlled, and which part(s) of the GFPP molecule are important for its fixation inside the substrate-binding pocket. Here, we present the first detailed analysis of the inherent atomic mobility in carbocation intermediates during sesterterpene biosynthesis. We identified two methyl groups as the least mobile of all the carbons of the carbocation intermediates in the first half of the cyclization cascade. Our analysis suggests that these two methyl groups are critical for the preorganization of GFPP in the biosynthetic pathways leading to sesterfisherol and quiannulatene.
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Affiliation(s)
- Hajime Sato
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan.,Clustering of Pioneering Research (CPR) Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Takaaki Mitsuhashi
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Mami Yamazaki
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Ikuro Abe
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanobu Uchiyama
- Clustering of Pioneering Research (CPR) Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.,Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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26
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Chang Z, Guillot R, Boddaert T, Aitken DJ. Stereocontrolled Preparation of Diversely Trifunctionalized Cyclobutanes. J Org Chem 2019; 84:10518-10525. [PMID: 31339722 DOI: 10.1021/acs.joc.9b01463] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The expedient and stereoselective syntheses of small libraries of trifunctionalized cyclobutane scaffolds bearing an acid, an amine, and a third functional group are described. Starting from a single precursor, the readily available protected derivative of all-cis-2-amino-3-hydroxycyclobutane-1-carboxylic acid, cis-trans stereoisomers are obtained following an SN2-type reaction, while all-trans stereoisomers are obtained using the same strategy preceded by a C1 epimerization reaction.
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Affiliation(s)
- Zong Chang
- CP3A Organic Synthesis Group & Services Communs, ICMMO, CNRS UMR 8182 , Université Paris Sud, Université Paris Saclay , 15 rue Georges Clemenceau , Orsay 91405 Cedex , France
| | - Régis Guillot
- CP3A Organic Synthesis Group & Services Communs, ICMMO, CNRS UMR 8182 , Université Paris Sud, Université Paris Saclay , 15 rue Georges Clemenceau , Orsay 91405 Cedex , France
| | - Thomas Boddaert
- CP3A Organic Synthesis Group & Services Communs, ICMMO, CNRS UMR 8182 , Université Paris Sud, Université Paris Saclay , 15 rue Georges Clemenceau , Orsay 91405 Cedex , France
| | - David J Aitken
- CP3A Organic Synthesis Group & Services Communs, ICMMO, CNRS UMR 8182 , Université Paris Sud, Université Paris Saclay , 15 rue Georges Clemenceau , Orsay 91405 Cedex , France
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27
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O'Hara C, Yang CH, Francis AJ, Newell BS, Wang H, Resendiz MJE. Photocycloaddition of S, S-Dioxo-benzothiophene-2-methanol, Reactivity in the Solid State and in Solution: Mechanistic Studies and Diastereoselective Formation of Cyclobutyl Rings. J Org Chem 2019; 84:9714-9725. [PMID: 31298854 DOI: 10.1021/acs.joc.9b01354] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The formation of cyclobutane rings is a promising strategy in the development of potential drugs and/or synthetic intermediates, typically challenging to obtain due to their constrained nature. In this work, the [2 + 2] photocycloaddition reaction of S,S-dioxobenzothiophene-2-methanol was explored in microcrystalline powders and its outcome was compared to that observed in solution. It was found that the molecular constraints inherited within the crystal lattice provide an optimal environment that leads to photodimer 4 as the major product in ca. 9.6:0.4 diastereomeric ratios with conversions >95%. The photoreaction was analyzed via X-ray, displaying a crystalline-to-amorphous transformation and showing that units of monomer 2 align to generate the corresponding dimer with a syn-head-to-tail regio- and diastereoselectivity. This result contrasted with that obtained in solution, where the diastereomeric ratio varied as a function of the excited state that is generated, to yield mixtures of dimers 4 and 5 (anti-head-to-tail), or exclusively 5 in the triplet-sensitized photoreaction, in the presence of benzophenone. Density functional theory was used to elucidate a plausible detailed mechanism for the phototransformation, which aided in justifying the results that led to the corresponding dimers. X-ray crystallography allowed us to establish the stereochemical assignment of the obtained cyclobutyl rings. Thus, the use of solid-state or solution photochemistry can be used to gain control of diastereo- and regioselectivities in the formation of this important moiety.
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Affiliation(s)
- Chelsea O'Hara
- Department of Chemistry , University of Colorado Denver , Science Building 1151 Arapahoe Street , Denver , Colorado 80204 , United States
| | - Chou-Hsun Yang
- Department of Chemistry , University of Colorado Denver , Science Building 1151 Arapahoe Street , Denver , Colorado 80204 , United States
| | - Andrew J Francis
- Department of Chemistry , University of Colorado Denver , Science Building 1151 Arapahoe Street , Denver , Colorado 80204 , United States
| | - Brian S Newell
- Department of Chemistry, Central Instrument Facility , Colorado State University , C1D Chemistry Building 1872, Campus Delivery , Fort Collins , Colorado 80523-1872 , United States
| | - Haobin Wang
- Department of Chemistry , University of Colorado Denver , Science Building 1151 Arapahoe Street , Denver , Colorado 80204 , United States
| | - Marino J E Resendiz
- Department of Chemistry , University of Colorado Denver , Science Building 1151 Arapahoe Street , Denver , Colorado 80204 , United States
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28
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Ghisu L, Melis N, Serusi L, Luridiana A, Soddu F, Secci F, Caboni P, Guillot R, Aitken DJ, Frongia A. Synthesis of β-sulfinyl cyclobutane carboxylic amides via a formal α to β sulphoxide migration process. Org Biomol Chem 2019; 17:6143-6147. [PMID: 31180093 DOI: 10.1039/c9ob00758j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An original tandem reaction consisting of a thermal elimination-addition process was developed. Highly substituted β-sulfinyl cyclobutane carboxylic acid derivatives were obtained from isomeric α-sulfinyl derivatives in a single operation in good to high yields and with high trans diastereoselectivity.
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Affiliation(s)
- Lorenza Ghisu
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato, S.S. 554, Bivio per Sestu, I-09042, Monserrato, Cagliari, Italy.
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29
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Beck JC, Lacker CR, Chapman LM, Reisman SE. A modular approach to prepare enantioenriched cyclobutanes: synthesis of (+)-rumphellaone A. Chem Sci 2019; 10:2315-2319. [PMID: 30881657 PMCID: PMC6385545 DOI: 10.1039/c8sc05444d] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 12/19/2018] [Indexed: 12/03/2022] Open
Abstract
A modular synthesis of enantioenriched polyfunctionalized cyclobutanes was developed that features an 8-aminoquinolinamide directed C-H arylation reaction. The C-H arylation products were derivatized through subsequent decarboxylative coupling processes. This synthetic strategy enabled a 9-step enantioselective total synthesis of the antiproliferative meroterpenoid (+)-rumphellaone A.
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Affiliation(s)
- Jordan C Beck
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , CA 91125 , USA .
| | - Caitlin R Lacker
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , CA 91125 , USA .
| | - Lauren M Chapman
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , CA 91125 , USA .
| | - Sarah E Reisman
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , CA 91125 , USA .
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30
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Tang B, Paton RS. Biosynthesis of Providencin: Understanding Photochemical Cyclobutane Formation with Density Functional Theory. Org Lett 2019; 21:1243-1247. [DOI: 10.1021/acs.orglett.8b03838] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bencan Tang
- Department of Chemical and Environment Engineering, Science and Engineering Building, The University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo 315100, China
| | - Robert S. Paton
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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31
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Akula PS, Hong BC, Lee GH. Catalyst- and Substituent-Controlled Switching of Chemoselectivity for the Enantioselective Synthesis of Fully Substituted Cyclobutane Derivatives via 2 + 2 Annulation of Vinylogous Ketone Enolates and Nitroalkene. Org Lett 2018; 20:7835-7839. [DOI: 10.1021/acs.orglett.8b03335] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pavan Sudheer Akula
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi 621, Taiwan, Republic of China
| | | | - Gene-Hsiang Lee
- Instrumentation Center, National Taiwan University, Taipei 106, Taiwan, Republic of China
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32
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Cool LG, Vermillion KE, Takeoka GR, Wang SC, Tantillo DJ. Biosynthesis and Conformational Properties of the Irregular Sesquiterpenoids Isothapsadiene and β-Isothapsenol. J Org Chem 2018; 83:5724-5730. [PMID: 29684282 DOI: 10.1021/acs.joc.8b00800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A carbocation cyclization/rearrangement mechanism for the biosynthesis of isothapsadiene and β-isothapsenol is shown to be energetically viable on the basis of density functional theory (DFT) calculations. In addition, for both isothapsadiene and β-isothapsenol, variable-temperature NMR experiments reveal two equilibrium conformers that undergo hindered exchange. The identities of these conformers, which are related by a chair-flip, are confirmed by DFT calculations on their structures, energies, 1H and 13C chemical shifts, and interconversion pathways.
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Affiliation(s)
- Laurence G Cool
- United States Department of Agriculture , Agricultural Research Service , 800 Buchanan Street , Albany , California 94710 , United States
| | - Karl E Vermillion
- United States Department of Agriculture , Agricultural Research Service , 1815 North University Street , Peoria , Illinois 61604 , United States
| | - Gary R Takeoka
- United States Department of Agriculture , Agricultural Research Service , 800 Buchanan Street , Albany , California 94710 , United States
| | - Selina C Wang
- Olive Center and Department of Food Science and Technology , University of California-Davis , Davis , California 95616 , United States
| | - Dean J Tantillo
- Department of Chemistry , University of California-Davis , Davis , California 95616 , United States
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33
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Hazra CK, Jeong J, Kim H, Baik MH, Park S, Chang S. Reductive Carbocyclization of Homoallylic Alcohols to syn
-Cyclobutanes by a Boron-Catalyzed Dual Ring-Closing Pathway. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201713285] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Chinmoy Kumar Hazra
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Jinhoon Jeong
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Hyunjoong Kim
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Mu-Hyun Baik
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
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34
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Hazra CK, Jeong J, Kim H, Baik MH, Park S, Chang S. Reductive Carbocyclization of Homoallylic Alcohols to syn
-Cyclobutanes by a Boron-Catalyzed Dual Ring-Closing Pathway. Angew Chem Int Ed Engl 2018; 57:2692-2696. [DOI: 10.1002/anie.201713285] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Chinmoy Kumar Hazra
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Jinhoon Jeong
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Hyunjoong Kim
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Mu-Hyun Baik
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
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García-García A, Oyarzabal I, Cepeda J, Seco JM, García-Valdivia AA, Gómez-Ruiz S, Salinas-Castillo A, Choquesillo-Lazarte D, Rodríguez-Diéguez A. Slow relaxation of magnetization and luminescence properties of a novel dysprosium and pyrene-1,3,6,8-tetrasulfonate based MOF. NEW J CHEM 2018. [DOI: 10.1039/c7nj02935g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A novel multifunctional Dy(iii) and pyrene-1,3,6,8-tetrasulfonate based MOF displays intense PL/ SIM behaviour.
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Affiliation(s)
| | - Itziar Oyarzabal
- Department of Applied Chemistry
- University of The Basque Country (UPV/EHU)
- 20018 San Sebastián
- Spain
| | - Javier Cepeda
- Department of Applied Chemistry
- University of The Basque Country (UPV/EHU)
- 20018 San Sebastián
- Spain
| | - José M. Seco
- Department of Applied Chemistry
- University of The Basque Country (UPV/EHU)
- 20018 San Sebastián
- Spain
| | | | - Santiago Gómez-Ruiz
- Department of Biology and Geology
- Physics and Inorganic Chemistry
- Rey Juan Carlos University
- Móstoles (Madrid)
- Spain
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36
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Chang Z, Boyaud F, Guillot R, Boddaert T, Aitken DJ. A Photochemical Route to 3- and 4-Hydroxy Derivatives of 2-Aminocyclobutane-1-carboxylic Acid with an all-cis Geometry. J Org Chem 2017; 83:527-534. [DOI: 10.1021/acs.joc.7b02559] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Zong Chang
- CP3A
Organic Synthesis Group, ICMMO, CNRS UMR 8182, Université Paris
Sud, Université Paris Saclay, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France
| | - France Boyaud
- CP3A
Organic Synthesis Group, ICMMO, CNRS UMR 8182, Université Paris
Sud, Université Paris Saclay, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France
| | - Régis Guillot
- Services
Communs, ICMMO, CNRS UMR 8182, Université Paris Sud, Université Paris Saclay, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France
| | - Thomas Boddaert
- CP3A
Organic Synthesis Group, ICMMO, CNRS UMR 8182, Université Paris
Sud, Université Paris Saclay, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France
| | - David J. Aitken
- CP3A
Organic Synthesis Group, ICMMO, CNRS UMR 8182, Université Paris
Sud, Université Paris Saclay, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France
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37
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Wang Z, Miller B, Mabin M, Shahni R, Wang ZD, Ugrinov A, Chu QR. Cyclobutane-1,3-Diacid (CBDA): A Semi-Rigid Building Block Prepared by [2+2] Photocyclization for Polymeric Materials. Sci Rep 2017; 7:13704. [PMID: 29057941 PMCID: PMC5651925 DOI: 10.1038/s41598-017-13983-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 10/04/2017] [Indexed: 01/30/2023] Open
Abstract
A previously overlooked building block, cyclobutane-1,3-diacid (CBDA), is introduced to materials synthesis due to its great potentials. As an example of CBDA, α-truxillic acid or 2,4-diphenylcyclobutane-1,3-dicarboxylic acid, was readily synthesized from commercially available trans-cinnamic acid. This CBDA showed outstanding stability both in sunlight and upon heating. While its two carboxylic acid groups can be readily utilized in connecting with other molecules to form new materials, the cyclobutane ring was able to tolerate acid and base treatments showing good chemical stability. A series of cyclobutane-containing polymers (CBPs), namely poly-α-truxillates, were obtained by condensation between α-truxillic acid and diols including ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-petanediol, and 1,6-hexanediol. The structures of these poly-α-truxillates were analyzed by NMR, FT-IR, and HRMS. Powder X-ray diffraction results of the poly-α-truxillates indicated that they are semi-crystalline materials. Preliminary thermal, chemical, and photochemical tests showed that the poly-α-truxillates exhibited comparable stabilities to PET.
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Affiliation(s)
- Zhihan Wang
- Department of Chemistry, University of North Dakota, Grand Forks, ND, 58202, USA
| | - Benjamin Miller
- Department of Chemistry, University of North Dakota, Grand Forks, ND, 58202, USA
| | - Micah Mabin
- Department of Chemistry, University of North Dakota, Grand Forks, ND, 58202, USA
| | - Rahul Shahni
- Department of Chemistry, University of North Dakota, Grand Forks, ND, 58202, USA
| | - Zijun D Wang
- Department of Chemistry, University of North Dakota, Grand Forks, ND, 58202, USA
| | - Angel Ugrinov
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, 58102, USA
| | - Qianli R Chu
- Department of Chemistry, University of North Dakota, Grand Forks, ND, 58202, USA.
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38
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Wang C, Lu Z. Intermolecular [2 + 2] Cycloaddition of 1,4-Dihydropyridines with Olefins via Energy Transfer. Org Lett 2017; 19:5888-5891. [DOI: 10.1021/acs.orglett.7b02881] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chengfeng Wang
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Zhan Lu
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
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39
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40
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Wang Z, Miller B, Butz J, Randazzo K, Wang ZD, Chu QR. Polyladderane Constructed from a Gemini Monomer through Photoreaction. Angew Chem Int Ed Engl 2017; 56:12155-12159. [DOI: 10.1002/anie.201705937] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Revised: 07/10/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Zhihan Wang
- Department of Chemistry; University of North Dakota; Grand Forks ND 58202 USA
| | - Benjamin Miller
- Department of Chemistry; University of North Dakota; Grand Forks ND 58202 USA
| | - Jonathan Butz
- Department of Chemistry; University of North Dakota; Grand Forks ND 58202 USA
| | - Katelyn Randazzo
- Department of Chemistry; University of North Dakota; Grand Forks ND 58202 USA
| | - Zijun D. Wang
- Department of Chemistry; University of North Dakota; Grand Forks ND 58202 USA
| | - Qianli R. Chu
- Department of Chemistry; University of North Dakota; Grand Forks ND 58202 USA
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41
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Barra L, Dickschat JS. Sceptrin - Enantioselective Synthesis of a Tetrasubstituted all-trans
Cyclobutane Key Intermediate. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700882] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Lena Barra
- Kekulé-Institute of Organic Chemistry and Biochemistry; Rheinische Friedrich Wilhelms University of Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Germany
| | - Jeroen S. Dickschat
- Kekulé-Institute of Organic Chemistry and Biochemistry; Rheinische Friedrich Wilhelms University of Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Germany
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42
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McCulley C, Geier MJ, Hudson BM, Gagné MR, Tantillo DJ. Biomimetic Platinum-Promoted Polyene Polycyclizations: Influence of Alkene Substitution and Pre-cyclization Conformations. J Am Chem Soc 2017; 139:11158-11164. [PMID: 28719198 PMCID: PMC5699452 DOI: 10.1021/jacs.7b05381] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Results of kinetic experiments and quantum chemical computations on a series of platinum-promoted polycyclization reactions are described. Analyses of these results reveal a reactivity model that reaches beyond the energetics of the cascade itself, incorporating an ensemble of pre-cyclization conformations of the platinum-alkene reactant complex, only a subset of which are productive for bi- (or larger) cyclization and lead to products. Similarities and differences between this scenario, including reaction coordinates for polycyclization, for platinum- and enzyme-promoted polycyclization reactions are highlighted.
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Affiliation(s)
- Christina McCulley
- Department of Chemistry, University of California–Davis, Davis, CA 95616, USA
| | - Michael J. Geier
- Caudill Laboratories, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Brandi M. Hudson
- Department of Chemistry, University of California–Davis, Davis, CA 95616, USA
| | - Michel R. Gagné
- Caudill Laboratories, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Dean J. Tantillo
- Department of Chemistry, University of California–Davis, Davis, CA 95616, USA
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43
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Flores-Giubi ME, Durán-Peña MJ, Botubol-Ares JM, Escobar-Montaño F, Zorrilla D, Macías-Sánchez AJ, Hernández-Galán R. Gaditanone, a Diterpenoid Based on an Unprecedented Carbon Skeleton Isolated from Euphorbia gaditana. JOURNAL OF NATURAL PRODUCTS 2017; 80:2161-2165. [PMID: 28678491 DOI: 10.1021/acs.jnatprod.7b00332] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A novel diterpenoid, gaditanone (2), which possesses an unprecedented 5/6/4/6-fused gaditanane tetracyclic ring skeleton, and a new jatrophane (1) were isolated from the aerial parts of Euphorbia gaditana. The chemical structures and absolute configurations were determined by extensive spectroscopic NMR studies and ECD data analysis. A proposed biosynthetic pathway is presented for compound 2.
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Affiliation(s)
- M Eugenia Flores-Giubi
- Departamento de Química Orgánica, Instituto de Biomoléculas, and ‡Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz , Campus Universitario Puerto Real s/n, 11510, Puerto Real, Cádiz, Spain
| | - María J Durán-Peña
- Departamento de Química Orgánica, Instituto de Biomoléculas, and ‡Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz , Campus Universitario Puerto Real s/n, 11510, Puerto Real, Cádiz, Spain
| | - José M Botubol-Ares
- Departamento de Química Orgánica, Instituto de Biomoléculas, and ‡Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz , Campus Universitario Puerto Real s/n, 11510, Puerto Real, Cádiz, Spain
| | - Felipe Escobar-Montaño
- Departamento de Química Orgánica, Instituto de Biomoléculas, and ‡Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz , Campus Universitario Puerto Real s/n, 11510, Puerto Real, Cádiz, Spain
| | - David Zorrilla
- Departamento de Química Orgánica, Instituto de Biomoléculas, and ‡Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz , Campus Universitario Puerto Real s/n, 11510, Puerto Real, Cádiz, Spain
| | - Antonio J Macías-Sánchez
- Departamento de Química Orgánica, Instituto de Biomoléculas, and ‡Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz , Campus Universitario Puerto Real s/n, 11510, Puerto Real, Cádiz, Spain
| | - Rosario Hernández-Galán
- Departamento de Química Orgánica, Instituto de Biomoléculas, and ‡Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz , Campus Universitario Puerto Real s/n, 11510, Puerto Real, Cádiz, Spain
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44
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Huang AC, Kautsar SA, Hong YJ, Medema MH, Bond AD, Tantillo DJ, Osbourn A. Unearthing a sesterterpene biosynthetic repertoire in the Brassicaceae through genome mining reveals convergent evolution. Proc Natl Acad Sci U S A 2017; 114:E6005-E6014. [PMID: 28673978 PMCID: PMC5530694 DOI: 10.1073/pnas.1705567114] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Sesterterpenoids are a rare terpene class harboring untapped chemodiversity and bioactivities. Their structural diversity originates primarily from the scaffold-generating sesterterpene synthases (STSs). In fungi, all six known STSs are bifunctional, containing C-terminal trans-prenyltransferase (PT) and N-terminal terpene synthase (TPS) domains. In plants, two colocalized PT and TPS gene pairs from Arabidopsis thaliana were recently reported to synthesize sesterterpenes. However, the landscape of PT and TPS genes in plant genomes is unclear. Here, using a customized algorithm for systematically searching plant genomes, we reveal a suite of physically colocalized pairs of PT and TPS genes for the biosynthesis of a large sesterterpene repertoire in the wider Brassicaceae. Transient expression of seven TPSs from A. thaliana, Capsella rubella, and Brassica oleracea in Nicotiana benthamiana yielded fungal-type sesterterpenes with tri-, tetra-, and pentacyclic scaffolds, and notably (-)-ent-quiannulatene, an enantiomer of the fungal metabolite (+)-quiannulatene. Protein and structural modeling analysis identified an amino acid site implicated in structural diversification. Mutation of this site in one STS (AtTPS19) resulted in premature termination of carbocation intermediates and accumulation of bi-, tri-, and tetracyclic sesterterpenes, revealing the cyclization path for the pentacyclic sesterterpene (-)-retigeranin B. These structural and mechanistic insights, together with phylogenetic analysis, suggest convergent evolution of plant and fungal STSs, and also indicate that the colocalized PT-TPS gene pairs in the Brassicaceae may have originated from a common ancestral gene pair present before speciation. Our findings further provide opportunities for rapid discovery and production of sesterterpenes through metabolic and protein engineering.
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Affiliation(s)
- Ancheng C Huang
- Department of Metabolic Biology, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, United Kingdom
| | - Satria A Kautsar
- Bioinformatics Group, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Young J Hong
- Department of Chemistry, University of California, Davis, CA 95616
| | - Marnix H Medema
- Bioinformatics Group, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Andrew D Bond
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Dean J Tantillo
- Department of Chemistry, University of California, Davis, CA 95616
| | - Anne Osbourn
- Department of Metabolic Biology, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, United Kingdom;
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45
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Hare SR, Tantillo DJ. Post-transition state bifurcations gain momentum – current state of the field. PURE APPL CHEM 2017. [DOI: 10.1515/pac-2017-0104] [Citation(s) in RCA: 105] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe existence of post-transition state bifurcations on potential energy surfaces for organic and biological reaction mechanisms has been known for decades, but recently, new reports of bifurcations have been occurring at a much higher rate. Beyond simply discovering bifurcations, computational chemists are developing techniques to understand what aspects of molecular structure and vibrations control the product selectivity in systems containing bifurcations. For example, the distribution of products seen in simulations has been found to be extremely sensitive to the local environment of the reacting system (i.e. the presence of a catalyst, enzyme, or explicit solvent molecules). The outlook for the future of this field is discussed, with an eye towards the application of the principles discussed here by experimental chemists to design a reaction setup to efficiently generate desired products.
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Affiliation(s)
- Stephanie R. Hare
- University of California, Davis, 1 Shields Avenue, Davis, CA 95616, USA
| | - Dean J. Tantillo
- University of California, Davis, 1 Shields Avenue, Davis, CA 95616, USA
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46
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Poplata S, Tröster A, Zou YQ, Bach T. Recent Advances in the Synthesis of Cyclobutanes by Olefin [2 + 2] Photocycloaddition Reactions. Chem Rev 2016; 116:9748-815. [PMID: 27018601 PMCID: PMC5025837 DOI: 10.1021/acs.chemrev.5b00723] [Citation(s) in RCA: 649] [Impact Index Per Article: 81.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Indexed: 11/30/2022]
Abstract
The [2 + 2] photocycloaddition is undisputedly the most important and most frequently used photochemical reaction. In this review, it is attempted to cover all recent aspects of [2 + 2] photocycloaddition chemistry with an emphasis on synthetically relevant, regio-, and stereoselective reactions. The review aims to comprehensively discuss relevant work, which was done in the field in the last 20 years (i.e., from 1995 to 2015). Organization of the data follows a subdivision according to mechanism and substrate classes. Cu(I) and PET (photoinduced electron transfer) catalysis are treated separately in sections 2 and 4 , whereas the vast majority of photocycloaddition reactions which occur by direct excitation or sensitization are divided within section 3 into individual subsections according to the photochemically excited olefin.
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Affiliation(s)
- Saner Poplata
- Department Chemie and Catalysis
Research Center (CRC), Technische Universität
München, D-85747 Garching, Germany
| | - Andreas Tröster
- Department Chemie and Catalysis
Research Center (CRC), Technische Universität
München, D-85747 Garching, Germany
| | - You-Quan Zou
- Department Chemie and Catalysis
Research Center (CRC), Technische Universität
München, D-85747 Garching, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis
Research Center (CRC), Technische Universität
München, D-85747 Garching, Germany
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47
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Norris MD, Perkins MV. Total Synthesis of Plakilactones C, B and des-Hydroxyplakilactone B by the Oxidative Cleavage of Gracilioether Furanylidenes. J Org Chem 2016; 81:6848-54. [DOI: 10.1021/acs.joc.6b01196] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Matthew D. Norris
- School of Chemical and Physical
Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Michael V. Perkins
- School of Chemical and Physical
Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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48
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Affiliation(s)
- Robin Meier
- Department Chemie; Ludwig-Maximilians-Universität München; 81377 München Deutschland
| | - Dirk Trauner
- Department Chemie; Ludwig-Maximilians-Universität München; 81377 München Deutschland
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49
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Meier R, Trauner D. A Synthesis of (±)-Aplydactone. Angew Chem Int Ed Engl 2016; 55:11251-5. [DOI: 10.1002/anie.201604102] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Indexed: 02/02/2023]
Affiliation(s)
- Robin Meier
- Department of Chemistry; Ludwig-Maximilians-Universität München; 81377 Munich Germany
| | - Dirk Trauner
- Department of Chemistry; Ludwig-Maximilians-Universität München; 81377 Munich Germany
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50
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Using quantum chemical computations of NMR chemical shifts to assign relative configurations of terpenes from an engineered Streptomyces host. J Antibiot (Tokyo) 2016; 69:534-40. [DOI: 10.1038/ja.2016.51] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 04/14/2016] [Accepted: 04/15/2016] [Indexed: 12/14/2022]
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