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He J, Cao T, Chen K, Zhu S. Leveraging Nonstrained C-C Bonds for Selective Carboacylation of an Unactivated Alkyne via Transient Dearomatization. Org Lett 2024; 26:2596-2600. [PMID: 38535522 DOI: 10.1021/acs.orglett.4c00608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Carboacylation of an unsaturated bond represents a powerful transformation. However, only a few examples of carboacylation of alkyne have been reported through C-C bond scission and reconnection. Here, we report a method of carboacylation of an unactivated alkyne by utilizing nonstrained C-C bonds under gold(I) catalysis. The density functional theory computational and experimental studies reveal that the reaction proceeds through a C-to-C formal 1,3-acyl migration via a solvent cage-nested acylium cation.
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Affiliation(s)
- Jiamin He
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Tongxiang Cao
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Kai Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Shifa Zhu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
- School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
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2
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Lui NM, Collum DB. Sodiated Oppolzer Enolates: Solution Structures, Mechanism of Alkylation, and Origin of Stereoselectivity. Org Chem Front 2023; 10:4750-4757. [PMID: 38144519 PMCID: PMC10746328 DOI: 10.1039/d3qo01021j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2023]
Abstract
NMR spectroscopic studies reveal camphorsultam-derived sodium enolates known as Oppolzer enolates reside as monomers in neat THF and THF/HMPA solutions and as dimers in toluene when solvated by N,N,N',N'-tetramethylethylenediamine (TMEDA) and N,N,N',N'',N''-pentamethyldiethylenediamine (PMDTA). Density functional theory (DFT) computations attest to the solvation numbers. Rate studies show analogy with previously studied lithiated Oppolzer enolates in which alkylation occurs through non-chelated solvent-separated ion pairs. The origins of the selectivity trace to transition structures in which the alkylating agent is guided to the exo face of the camphor owing to stereoelectronic preferences imparted by the sultam sulfonyl moiety. Marked secondary-shell solvation effects are gleaned from the rate studies.
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Affiliation(s)
- Nathan M Lui
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | - David B Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
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3
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Han F, Liu G, Zhao X, Du S, Ding Y, Zhang Q, Deng H, Wang L, Chen Y. Total synthesis and stereochemical assignment of rakicidin F. Org Biomol Chem 2022; 20:4135-4140. [PMID: 35510627 DOI: 10.1039/d2ob00692h] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Total synthesis of rakicidin F was accomplished in 20 linear steps (0.68% overall yield), which enabled the configural determination of its six stereogenic centers as 2R, 15R, 16R, 17S, 19S, and 21S. The macrolactonization of the rakicidin linear precursor was investigated and the unsuccessful results might be attributed to the steric hindrance near C16-OH.
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Affiliation(s)
- Fangzhi Han
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Guangju Liu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Xiuhe Zhao
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Shunshun Du
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Yahui Ding
- College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Quan Zhang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Huiting Deng
- Nankai University, Tianjin Third Central Hospital affiliated to Nankai University, Tianjin Key Laboratory of Extracorporeal Life Support for Critical Diseases, Institute of Hepatobiliary Disease, Tianjin, 300170, People's Republic of China
| | - Liang Wang
- College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
| | - Yue Chen
- College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
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4
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Han F, Liu G, Jin C, Wang J, Liu J, Wang L, Chen Y. Total Synthesis and Determination of the Absolute Configuration of Rakicidin C. Org Lett 2021; 23:7069-7073. [PMID: 34459614 DOI: 10.1021/acs.orglett.1c02476] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The absolute configuration of rakicidin C was predicted by comparison of optical rotation data and absolute configuration of APD-cyclic depsipeptides and further determined by total synthesis. The absolute configuration of five chiral centers was determined as 2R, 15R, 16R, 17S, and 19S. Our efficient route involves 19 longest linear steps with an overall yield of 1.49%.
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Affiliation(s)
- Fangzhi Han
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Guangju Liu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Chaofan Jin
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Jinghan Wang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Jianwei Liu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China
| | - Liang Wang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China.,College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China
| | - Yue Chen
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin, 300350, People's Republic of China.,College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China
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5
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Klychnikov MK, Pohl R, Císařová I, Jahn U. α,γ-Dioxygenated amides via tandem Brook rearrangement/radical oxygenation reactions and their application to syntheses of γ-lactams. Beilstein J Org Chem 2021; 17:688-704. [PMID: 33777244 PMCID: PMC7961876 DOI: 10.3762/bjoc.17.58] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 02/23/2021] [Indexed: 11/23/2022] Open
Abstract
Pyrrolidones are common heterocyclic fragments in various biologically active compounds. Here, a two-step radical-based approach to γ-lactams bearing three to four stereocenters starting from epoxides, N-allylic silylacetamides and TEMPO is reported. The sequence starts with a new tandem nucleophilic substitution/Brook rearrangement/single electron transfer-induced radical oxygenation furnishing orthogonally protected α,γ-dioxygenated N-allylamides with wide scope, mostly good yields, and partly good diastereo- and enantioselectivity for defined combinations of chiral epoxides and chiral amides. This represents a very rare example of an oxidative geminal C-C/C-O difunctionalization next to carbonyl groups. The resulting dioxygenated allylic amides are subsequently subjected to persistent radical effect-based 5-exo-trig radical cyclization reactions providing functionalized pyrrolidones in high yields as diastereomeric mixtures. They converge to 3,4-trans-γ-lactams by base-mediated equilibration, which can be easily further diversified. Stereochemical models for both reaction types were developed.
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Affiliation(s)
- Mikhail K Klychnikov
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 16610 Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 16610 Prague 6, Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, 12843 Prague 2, Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 16610 Prague 6, Czech Republic
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Abstract
A convergent synthetic route to the fungal metabolites cladosins B and C has been developed, affording these natural products in 29% and 27% overall yield, respectively. The cladosins are rare examples of hybrid polyketides featuring a 3-enamine tetramic acid group derived from l-valine. Key steps in this modular six-step sequence include a DMAP-mediated O- to C-acyl rearrangement to unite the side chains with the tetramic acid core and subsequent amine incorporation using either ammonium acetate or HMDS.
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Affiliation(s)
- Keith P Reber
- Department of Chemistry, Towson University, Towson, Maryland 21252, United States
| | - James Mease
- Department of Chemistry, Towson University, Towson, Maryland 21252, United States
| | - Justin Kim
- Department of Chemistry, Towson University, Towson, Maryland 21252, United States
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8
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Ma K, Liao D, Yang S, Li X, Lei X. Studies towards the synthesis of the functionalized C3–C14 decalin framework of alchivemycin A. Org Chem Front 2016. [DOI: 10.1039/c5qo00343a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we report our synthetic endeavors towards the synthesis of the C3–C14 fragment of the complex natural product alchivemycin A.
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Affiliation(s)
- Kaiqing Ma
- Modern Research Center for Traditional Chinese Medicine of Shanxi University
- Taiyuan 030006
- China
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
| | - Daohong Liao
- 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
- Synthetic and Functional Biomolecules Center
| | - Shaoqiang 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
- Synthetic and Functional Biomolecules Center
| | - Xiaofei Li
- National Institute of Biological Sciences (NIBS)
- Beijing 102206
- 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
- Synthetic and Functional Biomolecules Center
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9
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Kempf K, Schmitt F, Bilitewski U, Schobert R. Synthesis, stereochemical assignment, and bioactivity of the Penicillium metabolites penicillenols B1 and B2. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.05.116] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Pelkey ET, Pelkey SJ, Greger JG. De Novo Synthesis of 3-Pyrrolin-2-Ones. ADVANCES IN HETEROCYCLIC CHEMISTRY 2015. [DOI: 10.1016/bs.aihch.2015.04.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Sengoku T, Murata Y, Suzuki C, Takahashi M, Yoda H. Synthesis of new chiral lactam-fused pyridine derivatives. RSC Adv 2015. [DOI: 10.1039/c5ra16896a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An acid promoted cyclisation of benzylidene-modified tetramic acid and various enamines followed by MnO2 oxidation afforded the corresponding C2-symmetric and unsymmetric lactam-fused pyridines in enantiomerically pure forms.
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Affiliation(s)
- Tetsuya Sengoku
- Department of Applied Chemistry
- Faculty of Engineering
- Shizuoka University
- Hamamatsu 432-8561
- Japan
| | - Yusuke Murata
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu 432-8561
- Japan
| | - Chihiro Suzuki
- Department of Applied Chemistry
- Faculty of Engineering
- Shizuoka University
- Hamamatsu 432-8561
- Japan
| | - Masaki Takahashi
- Department of Applied Chemistry
- Faculty of Engineering
- Shizuoka University
- Hamamatsu 432-8561
- Japan
| | - Hidemi Yoda
- Department of Applied Chemistry
- Faculty of Engineering
- Shizuoka University
- Hamamatsu 432-8561
- Japan
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12
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Shang Z, Li L, Espósito BP, Salim AA, Khalil ZG, Quezada M, Bernhardt PV, Capon RJ. New PKS-NRPS tetramic acids and pyridinone from an Australian marine-derived fungus, Chaunopycnis sp. Org Biomol Chem 2015; 13:7795-802. [DOI: 10.1039/c5ob01058f] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Marine-derived fungus Chaunopycnis sp. yielded the tetramic acid F-14329 (1) and new analogues, chaunolidines A–C (2–4), together with the new pyridinone chaunolidone A (5), and pyridoxatin (6).
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Affiliation(s)
- Zhuo Shang
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Li Li
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation
- Institute of Materia Medica
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100050
- China
| | | | - Angela A. Salim
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Zeinab G. Khalil
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Michelle Quezada
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane
- Australia
| | - Robert J. Capon
- Institute for Molecular Bioscience
- The University of Queensland
- Brisbane
- Australia
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Hofferberth ML, Brückner R. α‐ and β‐Lipomycin: Total Syntheses by Sequential Stille Couplings and Assignment of the Absolute Configuration of All Stereogenic Centers. Angew Chem Int Ed Engl 2014; 53:7328-34. [DOI: 10.1002/anie.201402255] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Indexed: 01/08/2023]
Affiliation(s)
- Max L. Hofferberth
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstrasse 21, 79104 Freiburg (Germany) http://www.brueckner.uni‐freiburg.de
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstrasse 21, 79104 Freiburg (Germany) http://www.brueckner.uni‐freiburg.de
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Hofferberth ML, Brückner R. α‐ und β‐Lipomycin: Totalsynthesen auf der Grundlage sequentieller Stille‐Kupplungen und Zuordnung der absoluten Konfiguration aller stereogenen Zentren. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402255] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Max L. Hofferberth
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstraße 21, 79104 Freiburg (Deutschland) http://www.brueckner.uni‐freiburg.de
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstraße 21, 79104 Freiburg (Deutschland) http://www.brueckner.uni‐freiburg.de
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Wu G, Sun X, Yu G, Wang W, Zhu T, Gu Q, Li D. Cladosins A-E, hybrid polyketides from a deep-sea-derived fungus, Cladosporium sphaerospermum. JOURNAL OF NATURAL PRODUCTS 2014; 77:270-5. [PMID: 24499327 DOI: 10.1021/np400833x] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Five new fungal hybrid polyketides, cladosins A-D (1-4), that contain a novel linear 6(3)-enamino-8,10-dihydroxy-tetraketide (1 and 2) or 6-enamino-7(8)-en-10-ol (3 and 4) moiety, as well as the biogenetically related cladosin E (5), were isolated from the deep-sea-derived fungus Cladosporium sphaerospermum 2005-01-E3. Their structures (1-5) were elucidated through a combination of spectroscopic data, chemical conversion, and both Mosher's and Marfey's methods for stereochemical assignment. A plausible biogenetic pathway to 1-5 is proposed. Cladosin C (3) possesses mild anti-influenza A H1N1 virus activity.
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Affiliation(s)
- Guangwei Wu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, People's Republic of China
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Mo X, Li Q, Ju J. Naturally occurring tetramic acid products: isolation, structure elucidation and biological activity. RSC Adv 2014. [DOI: 10.1039/c4ra09047k] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Natural products containing the tetramic acid core scaffold have been isolated from an assortment of terrestrial and marine species and often display wide ranging and potent biological activities including antibacterial, antiviral and antitumoral activities.
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Affiliation(s)
- Xuhua Mo
- Shandong Key Laboratory of Applied Mycology
- School of Life Sciences
- Qingdao Agricultural University
- Qingdao, China
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology
| | - Qinglian Li
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology
- Guangdong Key Laboratory of Marine Materia Medica
- RNAM Center for Marine Microbiology
- South China Sea Institute of Oceanology
- Chinese Academy of Sciences
| | - Jianhua Ju
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology
- Guangdong Key Laboratory of Marine Materia Medica
- RNAM Center for Marine Microbiology
- South China Sea Institute of Oceanology
- Chinese Academy of Sciences
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Loscher S, Schobert R. Total Synthesis and Absolute Configuration of Epicoccamide D, a Naturally Occurring Mannosylated 3-Acyltetramic Acid. Chemistry 2013; 19:10619-24. [DOI: 10.1002/chem.201301914] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Indexed: 01/02/2023]
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18
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Total synthesis of virgineone aglycone and stereochemical assignment of natural virgineone. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.03.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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