1
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Weber F, Weber A, Schmitt L, Lechtenberg I, Greb J, Henßen B, Wesselborg S, Pietruszka J. From the Total Synthesis of Semi-Viriditoxin, Semi-Viriditoxic Acid and Dimeric Naphthopyranones to their Biological Activities in Burkitt B Cell Lymphoma. Chemistry 2024; 30:e202400559. [PMID: 38411573 DOI: 10.1002/chem.202400559] [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: 02/08/2024] [Revised: 02/26/2024] [Accepted: 02/27/2024] [Indexed: 02/28/2024]
Abstract
Dimeric naphthopyranones are known to be biologically active, however, for the corresponding monomeric naphthopyranones this information is still elusive. Here the first enantioselective total synthesis of semi-viriditoxic acid as well as the synthesis of semi-viriditoxin and derivatives is reported. The key intermediate in the synthesis of naphthopyranones is an α,β-unsaturated δ-lactone, which we synthesized in two different ways (Ghosez-cyclization and Grubbs ring-closing metathesis), while the domino-Michael-Dieckmann reaction of the α,β-unsaturated δ-lactone with an orsellinic acid derivative is the key reaction. A structure-activity relationship study was performed measuring the cytotoxicity in Burkitt B lymphoma cells (Ramos). The dimeric structure was found to be crucial for biological activity: Only the dimeric naphthopyranones showed cytotoxic and apoptotic activity, whereas the monomers did not display any activity at all.
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Affiliation(s)
- Frederike Weber
- Institute for Bioorganic Chemistry, Heinrich Heine University Düsseldorf in, Forschungszentrum Jülich, 52426, Jülich, Germany
| | - Anja Weber
- Institute for Bioorganic Chemistry, Heinrich Heine University Düsseldorf in, Forschungszentrum Jülich, 52426, Jülich, Germany
| | - Laura Schmitt
- Institute for Molecular Medicine I, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Ilka Lechtenberg
- Institute for Molecular Medicine I, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Julian Greb
- Institute for Bioorganic Chemistry, Heinrich Heine University Düsseldorf in, Forschungszentrum Jülich, 52426, Jülich, Germany
| | - Birgit Henßen
- Institute for Bioorganic Chemistry, Heinrich Heine University Düsseldorf in, Forschungszentrum Jülich, 52426, Jülich, Germany
- Institute of Bio- and Geosciences (IBG-1: Biotechnology), Forschungszentrum Jülich, 52426, Jülich, Germany
| | - Sebastian Wesselborg
- Institute for Molecular Medicine I, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Jörg Pietruszka
- Institute for Bioorganic Chemistry, Heinrich Heine University Düsseldorf in, Forschungszentrum Jülich, 52426, Jülich, Germany
- Institute of Bio- and Geosciences (IBG-1: Biotechnology), Forschungszentrum Jülich, 52426, Jülich, Germany
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2
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Choudhury UM, Mendhekar KL, Kunwar AC, Mohapatra DK. Total Synthesis and Determination of Absolute Configuration of Cryptorigidifoliol G. J Org Chem 2024; 89:5219-5228. [PMID: 36480814 DOI: 10.1021/acs.joc.2c02398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The first asymmetric total synthesis of (1S,5R,7S)-cryptorigidifoliol G and (1S,5R,7R)-cryptorigidifoliol G of the proposed natural product was achieved. The key steps in the synthesis involved Keck-Maruoka allylation, our own developed protocol for the construction of the trans-2,6-disubstituted dihydropyran, iodolactonization, cross-metathesis, Prins cyclization, and cis-Wittig olefination reaction. A comparison of the NMR as well as analytical data and thorough analysis of the 2D NMR suggested that the absolute stereochemistry of the proposed natural product is (1S,5R,7S)-cryptorigidifoliol G.
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Affiliation(s)
- Utkal Mani Choudhury
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Kishor L Mendhekar
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ajit C Kunwar
- Centre for NMR and Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Debendra K Mohapatra
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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3
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Ushakov PY, Ioffe SL, Sukhorukov AY. Regio- and diastereoselective access to densely functionalized ketones via the Boekelheide rearrangement of isoxazoline N-oxides. Org Biomol Chem 2022; 20:5624-5637. [PMID: 35796681 DOI: 10.1039/d2ob00787h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this work, the classical "isoxazoline route" toward aldols involving the [3 + 2]-cycloaddition of nitrile oxide to alkenes and hydrogenolysis of the oxime group was revisited. To avoid regioselectivity issues, [4 + 1]-annulation of nitroalkenes with sulfonium ylides was used to construct the isoxazoline ring bearing an N-oxide moiety. Subsequent deoxygenative C-H functionalization using the Boekelheide rearrangement and hydrogenolysis of the isoxazoline ring afforded α'-acyloxy-substituted aldols, which are difficult to access both by the classical aldol reaction and the "isoxazoline route". The products are formed in good to high overall yields and as single diastereomers in most cases. The synthetic use of these aldols was showcased by their smooth transformation into diastereomerically pure triols and a 2,3-diaryl-4-hydroxy-substituted tetrahydrofuran derivative, which is structurally related to cinncassin B.
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Affiliation(s)
- Pavel Yu Ushakov
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
| | - Sema L Ioffe
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
| | - Alexey Yu Sukhorukov
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
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4
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Miura Y, Saito Y, Nakagawa-Goto K. Synthesis of a Model Compound of the Unique Meroterpenoids Cryptolaevilactones. Chem Pharm Bull (Tokyo) 2022; 70:740-747. [PMID: 36184458 DOI: 10.1248/cpb.c22-00455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cryptolaevilactones (CLs) A-L, found in the leaves and twigs of Cryptocarya laevigata, are unique natural meroterpenoids with a spiro[3.5]nonane skeleton. We report the total synthesis of a simplified model compound of CLs A-C. The synthetic route included introduction of a styryl group and coupling of a lactone moiety to a spiro ring system, which was constructed by a pinacol-like rearrangement.
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Affiliation(s)
- Yuta Miura
- School of Pharmaceutical Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
| | - Yohei Saito
- School of Pharmaceutical Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
| | - Kyoko Nakagawa-Goto
- School of Pharmaceutical Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina
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5
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Fan Y, Liu Y, You YX, Rao L, Su Y, He Q, Hu F, Li Y, Wei W, Xu YK, Lin B, Zhang CR. Cytotoxic arylalkenyl α,β-unsaturated δ-lactones from Cryptocarya brachythyrsa. Fitoterapia 2019; 136:104167. [DOI: 10.1016/j.fitote.2019.05.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 04/29/2019] [Accepted: 05/05/2019] [Indexed: 11/24/2022]
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6
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Vaithegi K, Prasad KR. Enantiospecific total synthesis of the putative structure of cryptopyranmoscatone B2. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.04.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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7
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Reddy GS, Padhi B, Bharath Y, Mohapatra DK. Total Synthesis of Four Isomers of the Proposed Structures of Cryptorigidifoliol K. Org Lett 2017; 19:6506-6509. [DOI: 10.1021/acs.orglett.7b03174] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G. Sudhakar Reddy
- Natural
Products Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Mathura Road, New Delhi 110 025, India
| | - Birakishore Padhi
- Natural
Products Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Mathura Road, New Delhi 110 025, India
| | - Yada Bharath
- Natural
Products Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Mathura Road, New Delhi 110 025, India
| | - Debendra K. Mohapatra
- Natural
Products Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Mathura Road, New Delhi 110 025, India
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8
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Grimblat N, Sarotti AM. Computational Chemistry to the Rescue: Modern Toolboxes for the Assignment of Complex Molecules by GIAO NMR Calculations. Chemistry 2016; 22:12246-61. [DOI: 10.1002/chem.201601150] [Citation(s) in RCA: 144] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Nicolas Grimblat
- Instituto de Química Rosario CONICET Facultad de Ciencias Bioquímicas y Farmacéuticas; Universidad Nacional de Rosario; Suipacha 531 Rosario 2000) Argentina
| | - Ariel M. Sarotti
- Instituto de Química Rosario CONICET Facultad de Ciencias Bioquímicas y Farmacéuticas; Universidad Nacional de Rosario; Suipacha 531 Rosario 2000) Argentina
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9
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2014. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.09.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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11
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Perla R, Atla R, Jangili P, Anjibabu R. Stereoselective total synthesis of cryptomoscatone D1 and (5 R ,7 S )-kurzilactone via ring closing metathesis. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.01.091] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Yang BY, Kong LY, Wang XB, Zhang YM, Li RJ, Yang MH, Luo JG. Nitric Oxide Inhibitory Activity and Absolute Configurations of Arylalkenyl α,β-Unsaturated δ/γ-Lactones from Cryptocarya concinna. JOURNAL OF NATURAL PRODUCTS 2016; 79:196-203. [PMID: 26741483 DOI: 10.1021/acs.jnatprod.5b00839] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
During an ongoing exploration of potential anti-inflammatory agents from medicinal plants, eight new arylalkenyl α,β-unsaturated δ-lactones, cryptoconcatones A-H (1-8), and two unusual arylalkenyl α,β-unsaturated γ-lactones, cryptoconcatones I and J (9 and 10), were identified from the leaves and twigs of Cryptocarya concinna. The structures of these compounds were established based on spectroscopic data (MS, 1D/2D NMR), and their absolute configurations were determined with Riguera's method, the modified Mosher's method, chemical derivatization, and the Snatzke chirality rule. Compounds 4-6 and 8-10 showed inhibitory activity toward nitric oxide (NO) production in lipopolysaccharide-induced RAW 264.7 macrophages, particularly compounds 4 and 8-10, with IC50 values of 3.2, 4.2, 3.4, and 7.5 μM, respectively.
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Affiliation(s)
- Bing-Yuan Yang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , Nanjing 210009, People's Republic of China
| | - Ling-Yi Kong
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , Nanjing 210009, People's Republic of China
| | - Xiao-Bing Wang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , Nanjing 210009, People's Republic of China
| | - Yang-Mei Zhang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , Nanjing 210009, People's Republic of China
| | - Rui-Jun Li
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , Nanjing 210009, People's Republic of China
| | - Ming-Hua Yang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , Nanjing 210009, People's Republic of China
| | - Jian-Guang Luo
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , Nanjing 210009, People's Republic of China
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13
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Passareli F, Batista ANL, Cavalheiro AJ, Herrebout WA, Batista Junior JM. Vibrational spectroscopy as a direct stereochemical probe for polyhydroxylated molecules. Phys Chem Chem Phys 2016; 18:30903-30906. [DOI: 10.1039/c6cp07171f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Relative and absolute configurations of polyhydroxylated molecules via acetonide derivatives: the power of IR and VCD.
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Affiliation(s)
- F. Passareli
- Institute of Chemistry
- São Paulo State University – UNESP
- Araraquara
- Brazil
| | - A. N. L. Batista
- Institute of Chemistry
- São Paulo State University – UNESP
- Araraquara
- Brazil
| | - A. J. Cavalheiro
- Institute of Chemistry
- São Paulo State University – UNESP
- Araraquara
- Brazil
| | - W. A. Herrebout
- Department of Chemistry
- University of Antwerp
- Antwerp B2020
- Belgium
| | - J. M. Batista Junior
- Department of Chemistry
- Federal University of São Carlos – UFSCAr
- São Carlos
- Brazil
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14
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Grimblat N, Zanardi MM, Sarotti AM. Beyond DP4: an Improved Probability for the Stereochemical Assignment of Isomeric Compounds using Quantum Chemical Calculations of NMR Shifts. J Org Chem 2015; 80:12526-34. [PMID: 26580165 DOI: 10.1021/acs.joc.5b02396] [Citation(s) in RCA: 842] [Impact Index Per Article: 93.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The DP4 probability is one of the most sophisticated and popular approaches for the stereochemical assignment of organic molecules using GIAO NMR chemical shift calculations when only one set of experimental data is available. In order to improve the performance of the method, we have developed a modified probability (DP4+), whose main differences from the original DP4 are the inclusion of unscaled data and the use of higher levels of theory for the NMR calculation procedure. With these modifications, a significant improvement in the overall performance was achieved, providing accurate and confident results in establishing the stereochemistry of 48 challenging isomeric compounds.
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Affiliation(s)
- Nicolás Grimblat
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , Suipacha 531, Rosario 2000, Argentina
| | - María M Zanardi
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , Suipacha 531, Rosario 2000, Argentina.,Facultad de Química e Ingeniería "Fray Rogelio Bacón", Pontificia Universidad Católica Argentina , Av. Pellegrini 3314, Rosario 2000, Argentina
| | - Ariel M Sarotti
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , Suipacha 531, Rosario 2000, Argentina
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15
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Novaes LFT, Sarotti AM, Pilli RA. Total Synthesis and Tentative Structural Elucidation of Cryptomoscatone E3: Interplay of Experimental and Computational Studies. J Org Chem 2015; 80:12027-37. [DOI: 10.1021/acs.joc.5b01956] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luiz F. T. Novaes
- Departamento
de Química Orgânica, Instituto de Química, Universidade Estadual de Campinas (Unicamp), CP 6154, CEP 13084-971, Campinas, SP Brazil
| | - Ariel M. Sarotti
- Instituto
de Química Rosario, Facultad de Ciencias Bioquímicas
y Farmacéuticas, Universidad Nacional de Rosario-CONICET, Suipacha
531, S2002LRK Rosario, Argentina
| | - Ronaldo A. Pilli
- Departamento
de Química Orgânica, Instituto de Química, Universidade Estadual de Campinas (Unicamp), CP 6154, CEP 13084-971, Campinas, SP Brazil
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16
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Liu Y, Rakotondraibe LH, Brodie PJ, Wiley JD, Cassera MB, Miller JS, Ratovoson F, Rakotobe E, Rasamison VE, Kingston DGI. Antimalarial 5,6-Dihydro-α-pyrones from Cryptocarya rigidifolia: Related Bicyclic Tetrahydro-α-Pyrones Are Artifacts1. JOURNAL OF NATURAL PRODUCTS 2015; 78:1330-8. [PMID: 26042470 PMCID: PMC4485685 DOI: 10.1021/acs.jnatprod.5b00187] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Indexed: 06/04/2023]
Abstract
Antimalarial bioassay-guided fractionation of an EtOH extract of the root wood of Cryptocarya rigidifolia (Lauraceae) led to the isolation of the five new 5,6-dihydro-α-pyrones cryptorigidifoliols A-E (1-5) and the six bicyclic tetrahydro-α-pyrone derivatives cryptorigidifoliols F-K (6-11). The structure elucidations of all compounds were made on the basis of the interpretation of spectroscopic data and chemical derivatization, and the relative and absolute configurations were determined by NOESY, electronic circular dichroism (ECD), and (1)H NMR analysis of α-methoxyphenylacetyl (MPA) derivatives. The bicyclic tetrahydro-α-pyrone derivatives were identified as products of acid-catalyzed intramolecular Michael addition of the 5,6-dihydro-α-pyrones in the presence of silica gel. A structure-activity relationship study suggested that the presence of an α,β-unsaturated carbonyl moiety is not essential for potent antimalarial activity.
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Affiliation(s)
- Yixi Liu
- Department
of Chemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0212, Blacksburg, Virginia 24061, United States
| | - L. Harinantenaina Rakotondraibe
- Department
of Chemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0212, Blacksburg, Virginia 24061, United States
| | - Peggy J. Brodie
- Department
of Chemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0212, Blacksburg, Virginia 24061, United States
| | - Jessica D. Wiley
- Department
of Biochemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0308, Blacksburg, Virginia 24061, United States
| | - Maria B. Cassera
- Department
of Biochemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0308, Blacksburg, Virginia 24061, United States
| | - James S. Miller
- Missouri
Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166, United States
| | - F. Ratovoson
- Missouri
Botanical Garden, Lot
VP 31 Ankadibevava, Anjohy Antananarivo 101, Madagascar
| | - Etienne Rakotobe
- Centre
National d’Application des Recherches Pharmaceutiques, B.P. 702, Antananarivo 101, Madagascar
| | - Vincent E. Rasamison
- Centre
National d’Application des Recherches Pharmaceutiques, B.P. 702, Antananarivo 101, Madagascar
| | - David G. I. Kingston
- Department
of Chemistry and the Virginia Tech Center for Drug Discovery, Virginia Tech, M/C 0212, Blacksburg, Virginia 24061, United States
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17
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Abstract
The total synthesis of cryptomoscatone F1 has been accomplished for the first time.
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Affiliation(s)
- Atla Raju
- Natural Products Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 007
- India
| | - Gowravaram Sabitha
- Natural Products Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 007
- India
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18
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19
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Novaes LFT, Sarotti AM, Pilli RA. Total synthesis and stereochemical assignment of cryptolatifolione. RSC Adv 2015. [DOI: 10.1039/c5ra09186a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An enantioselective total synthesis of cryptolatifolione and its C-8 epimer is presented in a protecting-group-free fashion.
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Affiliation(s)
- Luiz F. T. Novaes
- Departamento de Química Orgânica
- Instituto de Química
- Universidade Estadual de Campinas (Unicamp)
- Campinas
- Brazil
| | - Ariel M. Sarotti
- Instituto de Química Rosario
- Facultad de Ciencias Bioquímicas y Farmacéuticas
- Universidad Nacional de Rosario-CONICET
- S2002LRK Rosario
- Argentina
| | - Ronaldo A. Pilli
- Departamento de Química Orgânica
- Instituto de Química
- Universidade Estadual de Campinas (Unicamp)
- Campinas
- Brazil
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