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Kimber MC, Lee DS. The Kornblum DeLaMare rearrangement in natural product synthesis: 25 years of innovation. Nat Prod Rep 2024; 41:813-833. [PMID: 38294038 DOI: 10.1039/d3np00058c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Covering: 1998 up to the end of 2023Since its initial disclosure in 1951, the Kornblum DeLaMare rearrangement has proved an important synthetic transformation and has been widely adopted as a biomimetic step in natural product synthesis. Utilising the base catalysed decomposition of alkyl peroxides to yield a ketone and alcohol has found use in many syntheses as well as a key strategic step, including the unmasking of furans, as a biomimetic synthetic tool, and the use of the rearrangement to install oxygen enantioselectively. Since ca. 1998, its impact as a synthetic transformation has grown significantly, especially given the frequency of use in natural product syntheses, therefore this 25 year time period will be the focus of the review.
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Affiliation(s)
- Marc C Kimber
- Department of Chemistry, School of Science, Loughborough University, Loughborough, LE11 3TU, UK.
| | - Darren S Lee
- Centre for Green Chemistry and Green Engineering at Yale, Yale University, New Haven, CT 06511, USA.
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2
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Jia Y, Wang M, Wu F, Wang Y, Chen X. A Synthetic Approach to Several C7-Carbasugars via a Key Intramolecular Morita-Baylis-Hillman Reaction. J Org Chem 2022; 87:14636-14645. [PMID: 36223290 DOI: 10.1021/acs.joc.2c01992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A new synthetic strategy for C7-carbasugars is developed via an intramolecular Morita-Baylis-Hillman reaction, in which a substituted dial precursor prepared from d-mannose cyclizes smoothly in the presence of DMAP to afford polyhydroxylated cyclohex-1-enecarbaldehyde with good yield. By employment of the cyclization products as key intermediates, the first syntheses of carbasugar ester 1 and epicorepoxydon A, as well as practical syntheses of epoxydines B and C, (-)-MK7607, (-)-streptol, and (-)-gabosine E are achieved.
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Affiliation(s)
- Yuanliang Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Maolin Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Folei Wu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Yue Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
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3
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Pombal S, M. Roncero A, E. Tobal I, García N, Silva L, Diez D, Mondolis E, Mero A, Morán-Pinzón J, Guerrero EI, Rodilla JM. Antioxidant Activity of New Carvone Derivatives. Nat Prod Commun 2020. [DOI: 10.1177/1934578x20908081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Carvone is one of the most versatile synthons in organic synthesis. It has been used as starting material for a huge number of organic syntheses of natural products with interesting biological activities. This manuscript communicates the antioxidant activity against superoxide of carvone and several derivatives.
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Affiliation(s)
- Sofia Pombal
- Departamento de Química, Materiais Fibrosos e Tecnologias Ambientais-FibEnTech, Universidade da Beira Interior, Rua Marquês d’Ávila e Bolama, Covilha, Portugal
| | - Alejandro M. Roncero
- Department of Organic Chemistry, Avda Los Caidos s/n, University of Salamanca, Spain
| | - Ignacio E. Tobal
- Department of Organic Chemistry, Avda Los Caidos s/n, University of Salamanca, Spain
| | - Nieves García
- Department of Organic Chemistry, Avda Los Caidos s/n, University of Salamanca, Spain
| | - Lúcia Silva
- Departamento de Química, Materiais Fibrosos e Tecnologias Ambientais-FibEnTech, Universidade da Beira Interior, Rua Marquês d’Ávila e Bolama, Covilha, Portugal
| | - David Diez
- Department of Organic Chemistry, Avda Los Caidos s/n, University of Salamanca, Spain
| | - Eily Mondolis
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama
| | - Aldahir Mero
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama
| | - Juan Morán-Pinzón
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama
| | - Estela I. Guerrero
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama
| | - Jesús M. Rodilla
- Departamento de Química, Materiais Fibrosos e Tecnologias Ambientais-FibEnTech, Universidade da Beira Interior, Rua Marquês d’Ávila e Bolama, Covilha, Portugal
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4
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Le TM, Huynh T, Endre G, Szekeres A, Fülöp F, Szakonyi Z. Stereoselective synthesis and application of isopulegol-based bi- and trifunctional chiral compounds. RSC Adv 2020; 10:38468-38477. [PMID: 35517552 PMCID: PMC9057261 DOI: 10.1039/d0ra07739a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 10/10/2020] [Indexed: 12/15/2022] Open
Abstract
A new family of isopulegol-based bi- and trifunctional chiral ligands such as triols, tetrols, aminodiols and aminotriols was developed from commercially available (−)-isopulegol with antibacterial, antifungal and antioxidant activities.
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Affiliation(s)
- Tam Minh Le
- Institute of Pharmaceutical Chemistry
- University of Szeged
- Interdisciplinary Excellence Centre
- H-6720 Szeged
- Hungary
| | - Thu Huynh
- Department of Microbiology
- University of Szeged
- 6726 Szeged
- Hungary
| | - Gábor Endre
- Department of Microbiology
- University of Szeged
- 6726 Szeged
- Hungary
| | - András Szekeres
- Department of Microbiology
- University of Szeged
- 6726 Szeged
- Hungary
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry
- University of Szeged
- Interdisciplinary Excellence Centre
- H-6720 Szeged
- Hungary
| | - Zsolt Szakonyi
- Institute of Pharmaceutical Chemistry
- University of Szeged
- Interdisciplinary Excellence Centre
- H-6720 Szeged
- Hungary
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5
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Li HY, Peng X, Jin X, Wei WJ, Ma KL, Li Y, Chen JJ, Gao K. Labdane-Type Diterpenoids from Leonurus japonicus and Their Plant-Growth Regulatory Activity. JOURNAL OF NATURAL PRODUCTS 2019; 82:2568-2579. [PMID: 31503485 DOI: 10.1021/acs.jnatprod.9b00422] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Thirteen new labdane-type diterpenoids 1-6, 9-11, 13, 14, 18, and 19 and seven known ones were isolated from the aerial parts of Leonurus japonicus. Compounds 1-5 represent rare examples of labdane-type diterpenoids, of which compounds 1-4 carry an N-chain linked at C-7 in their B-ring and compound 5 featured an α,β-unsaturated-γ-lactam moiety. The structures and absolute configurations of these new diterpenoids were characterized by a combination of spectroscopic techniques, X-ray crystallography, electronic circular dichroism, and calculated specific rotations. The plant-growth regulatory activity of these compounds on the growth of the roots and shoots of Lactuca sativa and Lolium perenne seedlings were evaluated. Compound 3 showed a broad-spectrum inhibitory activity with the inhibition rates ranging from 60 to 83.5% at a concentration of 200 μg/mL, which were as active as those of glyphosate. Compound 8 had a selective inhibitory activity against the growth of the roots of L. perenne seedlings with an inhibition rate of 81.7%. However, compounds 11 and 16 exhibited significant stimulation effects on the roots of L. sativa with stimulation rates of 59.8 and 65.3%, respectively. In addition, compounds 3 and 8 exhibited inhibitory effects on the germination of L. perenne seeds.
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Affiliation(s)
- Hang-Ying Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xing Peng
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xiaojie Jin
- College of Pharmacy , Gansu University of Chinese Medicine , Lanzhou 730000 , People's Republic of China
| | - Wen-Jun Wei
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Kai-Liang Ma
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Ya Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Jian-Jun Chen
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Kun Gao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , People's Republic of China
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Le TM, Szilasi T, Volford B, Szekeres A, Fülöp F, Szakonyi Z. Stereoselective Synthesis and Investigation of Isopulegol-Based Chiral Ligands. Int J Mol Sci 2019; 20:ijms20164050. [PMID: 31430981 PMCID: PMC6719113 DOI: 10.3390/ijms20164050] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/05/2019] [Accepted: 08/15/2019] [Indexed: 01/18/2023] Open
Abstract
A library of isopulegol-based bi-, tri- and tetrafunctional chiral ligands has been developed from commercially available (−)-isopulegol and applied as chiral catalysts in the addition of diethylzinc to benzaldehyde. Michael addition of primary amines towards α-methylene-γ-butyrolactone, followed by reduction, was accomplished to provide aminodiols in highly stereoselective transformations. Stereoselective epoxidation of (+)-neoisopulegol, derived from natural (−)-isopulegol, and subsequent oxirane ring opening with primary amines afforded aminodiols. The regioselective ring closure of N-substituted aminodiols with formaldehyde was also investigated. Hydroxylation of (+)-neoisopulegol resulted in diol, which was then transformed into aminotriols by aminolysis of its epoxides. Dihydroxylation of (+)-neoisopulegol or derivatives with OsO4/NMO gave neoisopulegol-based di-, tri- and tetraols in highly stereoselective reactions. The antimicrobial activity of aminodiol and aminotriol derivatives as well as di-, tri- and tetraols was also explored. In addition, structure–activity relationships were examined by assessing substituent effects on the aminodiol and aminotriol systems.
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Affiliation(s)
- Tam Minh Le
- Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary excellent center, H-6720 Szeged, Eötvös utca 6, Hungary
- Stereochemistry Research Group of the Hungarian Academy of Sciences, H-6720 Szeged, Eötvös utca 6, Hungary
| | - Tamás Szilasi
- Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary excellent center, H-6720 Szeged, Eötvös utca 6, Hungary
| | - Bettina Volford
- Department of Microbiology, University of Szeged, 6726 Szeged, Közép fasor 52, Hungary
| | - András Szekeres
- Department of Microbiology, University of Szeged, 6726 Szeged, Közép fasor 52, Hungary
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary excellent center, H-6720 Szeged, Eötvös utca 6, Hungary
- Stereochemistry Research Group of the Hungarian Academy of Sciences, H-6720 Szeged, Eötvös utca 6, Hungary
| | - Zsolt Szakonyi
- Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary excellent center, H-6720 Szeged, Eötvös utca 6, Hungary.
- Interdisciplinary Centre of Natural Products, University of Szeged, H-6720 Szeged, Eötvös utca 6, Hungary.
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7
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Morikawa H, Yamaguchi JI, Sugimura SI, Minamoto M, Gorou Y, Morinaga H, Motokucho S. Systematic synthetic study of four diastereomerically distinct limonene-1,2-diols and their corresponding cyclic carbonates. Beilstein J Org Chem 2019; 15:130-136. [PMID: 30745988 PMCID: PMC6350878 DOI: 10.3762/bjoc.15.13] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 12/17/2018] [Indexed: 01/02/2023] Open
Abstract
In order to produce versatile and potentially functional terpene-based compounds, a (R)-limonene-derived diol and its corresponding five-membered cyclic carbonate were prepared. The diol (cyclic carbonate) comprises four diastereomers based on the stereochemical configuration of the diol (and cyclic carbonate) moiety. By choosing the appropriate starting compounds (trans- and cis-limonene oxide) and conditions, the desired diastereomers were synthesised in moderate to high yields with, in most cases, high stereoselectivity. Comparison of the NMR data of the obtained diols and carbonates revealed that the four different diastereomers of each compound could be distinguished by reference to their characteristic signals.
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Affiliation(s)
- Hiroshi Morikawa
- Department of Applied Chemistry, Kanagawa Institute of Technology, 1030, Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan
| | - Jun-Ichi Yamaguchi
- Department of Applied Chemistry, Kanagawa Institute of Technology, 1030, Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan
| | - Shun-Ichi Sugimura
- Department of Applied Chemistry, Kanagawa Institute of Technology, 1030, Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan
| | - Masato Minamoto
- Department of Applied Chemistry, Kanagawa Institute of Technology, 1030, Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan
| | - Yuuta Gorou
- Department of Applied Chemistry, Kanagawa Institute of Technology, 1030, Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan
| | - Hisatoyo Morinaga
- Faculty of Education, Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4-4-37, Takeda, Kofu, Yamanashi 400-8510, Japan
| | - Suguru Motokucho
- Graduate School of Engineering, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki-city 852-8521, Japan
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8
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Nakamura S, Saito S, Yamakoshi H. Second-Generation Synthesis of a Chiral Building Block for Oxygenated Terpenoids via a Ring-Contractive Coupling with a Secondary Alcohol. HETEROCYCLES 2019. [DOI: 10.3987/com-18-s(f)74] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Tobal IE, Castañeda L, Roncero AM, Moro RF, Diez D, Marcos IS. Highly Functionalized Ring B Labdane Synthesis as Key Intermediate in the Route to Forskolin. Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Sclareol has been employed as starting material for the synthesis of several advanced intermediates towards the synthesis of highly ring B oxygenated labdanes. Dinorlabdanes 6,7,8,9-tetraoxygenated with 6,7-dioxygenated functionalities with α- cis or β- cis dispositions, have been prepared and can be used for forskolin or analogues synthesis.
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Affiliation(s)
- Ignacio E. Tobal
- Department of Organic Chemistry, Avda Los Caidos s/n, Salamanca University, Salamanca, Spain, 37008
| | - Lourdes Castañeda
- Department of Organic Chemistry, Avda Los Caidos s/n, Salamanca University, Salamanca, Spain, 37008
| | - Alejandro M. Roncero
- Department of Organic Chemistry, Avda Los Caidos s/n, Salamanca University, Salamanca, Spain, 37008
| | - Rosalina F. Moro
- Department of Organic Chemistry, Avda Los Caidos s/n, Salamanca University, Salamanca, Spain, 37008
| | - David Diez
- Department of Organic Chemistry, Avda Los Caidos s/n, Salamanca University, Salamanca, Spain, 37008
| | - Isidro S. Marcos
- Department of Organic Chemistry, Avda Los Caidos s/n, Salamanca University, Salamanca, Spain, 37008
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10
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Pombal S, Hernández Y, Diez D, Mondolis E, Mero A, Morán-Pinzón J, Guerrero EI, Rodilla JM. Antioxidant Activity of Carvone and Derivatives against Superoxide Ion. Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Carvone has corroborated its versatility as starting material for building blocks synthesis in organic chemistry, being achieved a new chiral lactone. It has been done a study on the antioxidant activity against superoxide of carvone and a chloro derivative that show the potent activity of the natural product ( R)-carvone, 1.
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Affiliation(s)
- Sofia Pombal
- Materiais Fibrosos e Tecnologias Ambientais-FibEnTech, Departamento de Química, Universidade da Beira Interior, Rua Marquês d'Ávila e Bolama, 6201-001- Covilhã, Portugal
| | - Yaiza Hernández
- Department of Organic Chemistry, Avda Los Caidos s/n, University of Salamanca, Salamanca, Spain, 37008
| | - David Diez
- Department of Organic Chemistry, Avda Los Caidos s/n, University of Salamanca, Salamanca, Spain, 37008
| | - Eily Mondolis
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama, Panama
| | - Aldahir Mero
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama, Panama
| | - Juan Morán-Pinzón
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama, Panama
| | - Estela I. Guerrero
- Department of Pharmacology, Avda Gustavo García de Paredes, Panama University, Panama, Panama
| | - Jesús M. Rodilla
- Materiais Fibrosos e Tecnologias Ambientais-FibEnTech, Departamento de Química, Universidade da Beira Interior, Rua Marquês d'Ávila e Bolama, 6201-001- Covilhã, Portugal
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11
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Synthesis and antifungal activity of ethers, alcohols, and iodohydrin derivatives of sclareol against phytopathogenic fungi in vitro. Bioorg Med Chem Lett 2015; 25:2773-7. [DOI: 10.1016/j.bmcl.2015.05.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 04/25/2015] [Accepted: 05/08/2015] [Indexed: 11/24/2022]
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12
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Li H, Li MM, Su XQ, Sun J, Gu YF, Zeng KW, Zhang Q, Zhao YF, Ferreira D, Zjawiony JK, Li J, Tu PF. Anti-inflammatory labdane diterpenoids from Lagopsis supina. JOURNAL OF NATURAL PRODUCTS 2014; 77:1047-1053. [PMID: 24707938 DOI: 10.1021/np5001329] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ten new labdane diterpenoids, lagopsins A-H (1-3, 5, 7-10) and 15-epi-lagopsins C and D (4, 6), together with five known labdane diterpenoids (11-15), were isolated from the whole plants of Lagopsis supina. The absolute configuration of lagopsin A (1) was determined by single-crystal X-ray crystallographic analysis. Compounds 7, 9, 13, and 15 exhibited moderate inhibition of nitric oxide production stimulated by lipopolysaccharide in BV-2 microglial cells with IC50 values in the range 14.9-34.9 μM.
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Affiliation(s)
- Hui Li
- Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine , Beijing 100029, People's Republic of China
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13
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Shul′ts EE, Mironov ME, Kharitonov YV. Furanoditerpenoids of the Labdane Series: Occurrence in Plants, Total Synthesis, Several Transformations, and Biological Activity. Chem Nat Compd 2014. [DOI: 10.1007/s10600-014-0861-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Narukawa Y, Niimura A, Noguchi H, Tamura H, Kiuchi F. New diterpenoids with estrogen sulfotransferase inhibitory activity from Leonurus sibiricus L. J Nat Med 2013; 68:125-31. [DOI: 10.1007/s11418-013-0781-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 05/06/2013] [Indexed: 11/24/2022]
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15
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Snyder SA, Brucks AP, Treitler DS, Moga I. Concise synthetic approaches for the Laurencia family: formal total syntheses of (±)-laurefucin and (±)-E- and (±)-Z-pinnatifidenyne. J Am Chem Soc 2012; 134:17714-21. [PMID: 23057834 DOI: 10.1021/ja3076988] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein is presented a cohesive strategy to rapidly fashion diverse members of the lauroxocane family of natural products, leading to the shortest syntheses of any member to date. These efforts include racemic formal total syntheses of laurefucin and E- and Z-pinnatifidenyne as well as a facile preparation of the oxocene core of 3E-dehydrobromolaurefucin. The key elements of the design are novel diastereoselective ring-expanding bromoetherifications of tetrahydrofurans triggered by a unique bromonium source (BDSB, Et(2)SBr·SbBrCl(5)) and strategically positioned nucleophilic traps, where altering the identity and position of these traps affords diverse functionality on the eight-membered ring backbone. Its biogenetic relevance is also discussed in light of the range of substrates that successfully undergo this key rearrangement.
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Affiliation(s)
- Scott A Snyder
- Department of Chemistry, Columbia University, Havemeyer Hall, 3000 Broadway, New York, New York 10027, USA.
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16
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Khan S, Shehzad O, Jin HG, Woo ER, Kang SS, Baek SW, Kim J, Kim YS. Anti-inflammatory mechanism of 15,16-epoxy-3α-hydroxylabda-8,13(16),14-trien-7-one via inhibition of LPS-induced multicellular signaling pathways. JOURNAL OF NATURAL PRODUCTS 2012; 75:67-71. [PMID: 22233348 DOI: 10.1021/np200666t] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Phytochemical investigation of Leonurus japonicus has led to the isolation of a labdane diterpene derivative, 15,16-epoxy-3α-hydroxylabda-8,13(16),14-trien-7-one (1), which was tested for its in vitro anti-inflammatory effects. The results demonstrated that 1 exhibits an inhibitory effect on LPS-stimulated RAW 264.7 macrophages. The anti-inflammatory action shown by 1 suppressed LPS-induced NF-κB activation, resulting in the down-regulation of iNOS and COX-2 protein expression, attributable to the inhibitory action of LPS-induced NO and PGE(2) production. Compound 1 inhibited LPS-induced phosphorylation and the degradation of inhibitory kappa B (IκBα) and decreased the nuclear translocation of p50 and p65. In addition, 1 exhibited an inhibitory effect on LPS-induced NF-κB-DNA and AP-1-DNA binding activity, using an electrophoretic mobility shift assay with NF-κB- and AP-1-specific (32)P-labeled probes. The LPS-induced mitogen-activated protein kinases (p-JNK, p-p38, and p-ERK) and p-Akt were inhibited after 30 and 10 min of LPS stimulation, respectively. In addition, TNF-α production was suppressed by 1.
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Affiliation(s)
- Salman Khan
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
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17
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Frija LMT, Frade RFM, Afonso CAM. Isolation, chemical, and biotransformation routes of labdane-type diterpenes. Chem Rev 2011; 111:4418-52. [PMID: 21618966 DOI: 10.1021/cr100258k] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Luís M T Frija
- CQFM - Centro de Química-Física Molecular and IN - Institute of Nanoscience and Nanotechnology, Departamento de Engenharia Química e Biológica Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal.
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19
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20
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Yamaguchi-Type Lactonization as a Key Step in the Synthesis of Marine Metabolites: (+)-Luffalactone. J Org Chem 2009; 74:7750-4. [DOI: 10.1021/jo9013996] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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21
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Jung ME, Cordova J, Murakami M. Total Synthesis of (±)-Kellermanoldione: Stepwise Cycloaddition of a Functionalized Diene and Allenoate. Org Lett 2009; 11:3882-5. [DOI: 10.1021/ol901455q] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael E. Jung
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095
| | - Jesus Cordova
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095
| | - Masayuki Murakami
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095
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