1
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Dekić M, Radulović N, Antonijević M, Dekić D, Ličina B. The essential oil of the condiment species Clinopodium thymifolium (Scop.) Kuntze: new natural products and seasonal variation. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:2437-2444. [PMID: 34632586 DOI: 10.1002/jsfa.11583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 04/12/2021] [Accepted: 10/10/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Clinopodium thymifolium is an aromatic plant species that is widespread in the Mediterranean region. It has been considered as a condiment and is used in cooking. As a promising spice plant, some efforts are being made to introduce this plant as a new crop species and it has been successfully cultivated in northern Italy. RESULTS Essential oils isolated from the aerial parts of a flavoring species C. thymifolium were analyzed by gas chromatography and gas chromatography/mass spectrometry. The results of a detailed analysis of the chemical composition of the oils showed the domination of pulegone, piperitone, piperitenone and isomenthone, as well as a significant alteration of the pulegone/isomenthone ratio with the developmental stage of the plant. Additionally, a comprehensive chemical analysis of the oils in combination with detailed spectral analyses and chemical synthesis of selected compounds has led to the identification of two new natural products: isomenthyl formate and neomenthyl 2-methylbutanoate. CONCLUSION The observed chemical variability at the intrapopulation level appeared to be a phenological variation. In an evolutionary sense, the alteration of the pulegone/isomenthone ratio suggests their possible role in the ecological adaptation of the species to pollinators. Significant quantitative changes in the chemical composition of the oil at different phenological stages may be relevant in the case of plant material intended for edible purposes. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Milan Dekić
- Department of Chemical and Technological Sciences, State University of Novi Pazar, Novi Pazar, Serbia
| | - Niko Radulović
- Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Niš, Serbia
| | - Marko Antonijević
- Department of Chemical and Technological Sciences, State University of Novi Pazar, Novi Pazar, Serbia
| | - Dušica Dekić
- Faculty of Agronomy, University of Kragujevac, Čačak, Serbia
| | - Braho Ličina
- Department of Biomedical Sciences, State University of Novi Pazar, Novi Pazar, Serbia
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2
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Dekić MS, Radulović NS, Selimović ES, Boylan F. A series of esters of diastereomeric menthols: Comprehensive mass spectral libraries and gas chromatographic data. Food Chem 2021; 361:130130. [PMID: 34062458 DOI: 10.1016/j.foodchem.2021.130130] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 05/06/2021] [Accepted: 05/13/2021] [Indexed: 10/21/2022]
Abstract
A comprehensive data collection of mass spectral and gas chromatographic data of a series of esters of diastereomeric menthols (menthol, isomenthol, neomenthol, and neoisomenthol), in total 150 chemical entities, obtained by GC-MS on commonly used capillary columns of different polarity (non-polar HP-5MS and polar HP-Innowax), was created. Also, MS libraries containing electron ionization MS recorded on single quadrupole as well as on quadrupole ion-trap mass detectors together with the RIs on non-polar and polar columns were compiled (available as supplementary materials). The results point out to frequent misidentification of neoisomenthyl acetate as isomenthyl acetate in the literature, and the means of how to resolve this issue was suggested. The outcomes of this study provide chemists and food technologists with a useful tool in the field of food analysis of compounds with important food aroma properties.
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Affiliation(s)
- Milan S Dekić
- Department of Chemical and Technological Sciences, State University of Novi Pazar, Vuka Karadžića 9, 36300 Novi Pazar, Serbia
| | - Niko S Radulović
- Department of Chemical and Technological Sciences, State University of Novi Pazar, Vuka Karadžića 9, 36300 Novi Pazar, Serbia; Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia.
| | - Enisa S Selimović
- Department of Chemical and Technological Sciences, State University of Novi Pazar, Vuka Karadžića 9, 36300 Novi Pazar, Serbia
| | - Fabio Boylan
- School of Pharmacy and Pharmaceutical Sciences, Panoz Institute, Trinity College, Dublin 2, Ireland
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3
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Steroidal Aphidicolin Analogues Derived from Pregnenolone. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.1177/174751989902301207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The conversion of pregnenolone into the 3β,5α-, 3α,5α-, 4β,5α-, 3α,4α-, 3α,4β- and 3α,4α-dihydroxy derivatives of 17β-hydroxymethyl-5β-androstane as steroidal analogues of the diterpenoid DNA polymerase α inhibitor, aphidicolin, is described.
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4
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Hirose D, Gazvoda M, Košmrlj J, Taniguchi T. Systematic Evaluation of 2-Arylazocarboxylates and 2-Arylazocarboxamides as Mitsunobu Reagents. J Org Chem 2018; 83:4712-4729. [PMID: 29570289 DOI: 10.1021/acs.joc.8b00486] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
2-Arylazocarboxylate and 2-arylazocarboxamide derivatives can serve as replacements of typical Mitsunobu reagents such as diethyl azodicarboxylate. A systematic investigation of the reactivity and physical properties of those azo compounds has revealed that they have an excellent ability as Mitsunobu reagents. These reagents show similar or superior reactivity as compared to the known azo reagents and are applicable to the broad scope of substrates. p Ka and steric effects of substrates have been investigated, and the limitation of the Mitsunobu reaction can be overcome by choosing suitable reagents from the library of 2-arylazocarboxylate and 2-aryl azocarboxamide derivatives. Convenient recovery of azo reagents is available by one-pot iron-catalyzed aerobic oxidation, for example. SC-DSC analysis of representative 2-arylazocarboxylate and 2-arylazocarboxamide derivatives has shown high thermal stability, indicating that these azo reagents possess lower chemical hazard compared with typical azo reagents.
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Affiliation(s)
| | - Martin Gazvoda
- Faculty of Chemistry and Chemical Technology , University of Ljubljana , Večna pot 113 , SI-1000 Ljubljana , Slovenia
| | - Janez Košmrlj
- Faculty of Chemistry and Chemical Technology , University of Ljubljana , Večna pot 113 , SI-1000 Ljubljana , Slovenia
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5
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Golten S, Fontenelle CQ, Timofte RS, Bailac L, Light M, Sebban M, Oulyadi H, Linclau B. Enantioselective Synthesis of Dideoxy-tetrafluorinated Hexoses. J Org Chem 2016; 81:4434-53. [DOI: 10.1021/acs.joc.6b00302] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samuel Golten
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - Clément Q. Fontenelle
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - Roxana S. Timofte
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - Laura Bailac
- Normandie Université, COBRA, UMR6014, and FR3038 CNRS,
Université de Rouen, INSA de Rouen, Mont-Saint-Aignan, Cedex 76821 France
| | - Mark Light
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - Muriel Sebban
- Normandie Université, COBRA, UMR6014, and FR3038 CNRS,
Université de Rouen, INSA de Rouen, Mont-Saint-Aignan, Cedex 76821 France
| | - Hassan Oulyadi
- Normandie Université, COBRA, UMR6014, and FR3038 CNRS,
Université de Rouen, INSA de Rouen, Mont-Saint-Aignan, Cedex 76821 France
| | - Bruno Linclau
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
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6
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Kobayashi S, Yokoi T, Inoue T, Hori Y, Saka T, Shimomura T, Masuyama A. Stereocontrolled Synthesis of a Possible Stereoisomer of Laurenidificin and a Formal Total Synthesis of (+)-Aplysiallene Featuring a Stereospecific Ring Contraction. J Org Chem 2016; 81:1484-98. [DOI: 10.1021/acs.joc.5b02595] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shoji Kobayashi
- Department of Applied Chemistry,
Faculty of Engineering, Osaka Institute of Technology, 5-16-1
Ohmiya, Asahi-ku, Osaka 535-8585, Japan
| | - Taiki Yokoi
- Department of Applied Chemistry,
Faculty of Engineering, Osaka Institute of Technology, 5-16-1
Ohmiya, Asahi-ku, Osaka 535-8585, Japan
| | - Tomoharu Inoue
- Department of Applied Chemistry,
Faculty of Engineering, Osaka Institute of Technology, 5-16-1
Ohmiya, Asahi-ku, Osaka 535-8585, Japan
| | - Yutaka Hori
- Department of Applied Chemistry,
Faculty of Engineering, Osaka Institute of Technology, 5-16-1
Ohmiya, Asahi-ku, Osaka 535-8585, Japan
| | - Tomoaki Saka
- Department of Applied Chemistry,
Faculty of Engineering, Osaka Institute of Technology, 5-16-1
Ohmiya, Asahi-ku, Osaka 535-8585, Japan
| | - Taiki Shimomura
- Department of Applied Chemistry,
Faculty of Engineering, Osaka Institute of Technology, 5-16-1
Ohmiya, Asahi-ku, Osaka 535-8585, Japan
| | - Araki Masuyama
- Department of Applied Chemistry,
Faculty of Engineering, Osaka Institute of Technology, 5-16-1
Ohmiya, Asahi-ku, Osaka 535-8585, Japan
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7
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Camp D, Harvey PJ, Jenkins ID. The effect of solvent polarity on the rate of the Mitsunobu esterification reaction. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Bates RW, Aslam NFBM, Tang CH, Simon O. A synthesis of 5-hydroxysedamine using hydroformylation. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Bartlett N, Gross L, Péron F, Asby DJ, Selby MD, Tavassoli A, Linclau B. Stereocontrol by quaternary centres: a stereoselective synthesis of (-)-luminacin D. Chemistry 2014; 20:3306-10. [PMID: 24519660 DOI: 10.1002/chem.201304776] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Indexed: 01/28/2023]
Abstract
Very high diastereoselectivity can be achieved by 1,3-chelation-controlled allylation of aldehydes that possess a non-chelating α-ether substituent, even if the α-position is a quaternary centre and/or a spiro-epoxide. This reaction was used as a key step in an enantioselective synthesis of the angiogenesis inhibitor luminacin D.
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Affiliation(s)
- Nathan Bartlett
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ (UK)
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10
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Yang EG, Sekar K, Lear MJ. A macrolactonisation approach to the cembrane carbocycle of bielschowskysin. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.06.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Humbert A, Plé K, Harakat D, Martinez A, Haudrechy A. A Further Contribution to the Study of Sagittamide A: Synthesis of a Pivotal Intermediate Belonging to a Rare L-Series. Molecules 2012; 17:7709-21. [PMID: 22732884 PMCID: PMC6268772 DOI: 10.3390/molecules17077709] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 06/13/2012] [Accepted: 06/18/2012] [Indexed: 11/23/2022] Open
Abstract
A key saggitamide intermediate corresponding to a rare sugar framework has been obtained. This approach should help to establish the overall configuration of more complex structures of the sagittamide family.
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Affiliation(s)
- Anne Humbert
- Institut de Chimie Moléculaire de Reims, UMR CNRS 7312, Université de Reims, BP 1039, F-51687 REIMS Cedex, France.
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12
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Lajiness JP, Jiang W, Boger DL. Divergent total syntheses of (-)-aspidospermine and (+)-spegazzinine. Org Lett 2012; 14:2078-81. [PMID: 22480368 PMCID: PMC3337885 DOI: 10.1021/ol300599p] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Divergent total syntheses of (+)-spegazzinine (1) and (-)-aspidospermine (2) and their extensions to the synthesis of C19-epi-aspidospermine and C3-epi-spegazzinine are detailed, confirming the relative stereochemistry and establishing the absolute configuration of (+)-spegazzinine. A powerful intramolecular [4 + 2]/[3 + 2] cycloaddition cascade of a 1,3,4-oxadiazole provided the pentacyclic skeleton and all the requisite stereochemistry of the natural products in a single reaction that forms three rings, four C-C bonds, and five stereocenters.
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Affiliation(s)
- James P. Lajiness
- Department of Chemistry and Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Wanlong Jiang
- Department of Chemistry and Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Dale L. Boger
- Department of Chemistry and Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
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13
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Greszler SN, Malinowski JT, Johnson JS. Formal synthesis of leustroducsin B via Reformatsky/Claisen condensation of silyl glyoxylates. Org Lett 2011; 13:3206-9. [PMID: 21591684 PMCID: PMC3115596 DOI: 10.1021/ol2011192] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A formal synthesis of leustroducsin B has been completed. The synthesis relies upon a recently developed Reformatsky/Claisen condensation of silyl glyoxylates and enantioenriched β-lactones that establishes two of the molecule's three core stereocenters and permits further elaboration to an intermediate in Imanishi's synthesis via reliable chemistry (Prasad reduction, asymmetric pentenylation, Mitsunobu inversion).
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Affiliation(s)
- Stephen N. Greszler
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Justin T. Malinowski
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
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14
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Greszler SN, Malinowski JT, Johnson JS. Remote stereoinduction in the acylation of fully substituted enolates: tandem Reformatsky/quaternary Claisen condensations of silyl glyoxylates and β-lactones. J Am Chem Soc 2010; 132:17393-5. [PMID: 21087044 DOI: 10.1021/ja108848d] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reformatsky reagents react sequentially with silyl glyoxylates and β-lactones to give highly functionalized Claisen condensation products. A heretofore undocumented instance of stereochemical 1,4-induction results in efficient transmission of β-lactone stereochemistry to the emerging fully substituted stereocenter. Second-stage transformations reveal that the five heteroatom-containing functionalities embedded within the products are entirely chemo-differentiated, a circumstance that permits rapid assembly of the leustroducsin B core substructure.
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Affiliation(s)
- Stephen N Greszler
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA
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15
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Warmerdam EGJC, van den Nieuwendijk AMCH, Brussee J, van der Gen A, Kruse CG. Synthesis of (R)- and (S)-2-hydroxy-3-enoic acid esters. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19961150105] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Swamy KCK, Kumar NNB, Balaraman E, Kumar KVPP. Mitsunobu and Related Reactions: Advances and Applications. Chem Rev 2009; 109:2551-651. [PMID: 19382806 DOI: 10.1021/cr800278z] [Citation(s) in RCA: 873] [Impact Index Per Article: 58.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. C. Kumara Swamy
- School of Chemistry, University of Hyderabad, Hyderabad − 500046, A. P., India
| | - N. N. Bhuvan Kumar
- School of Chemistry, University of Hyderabad, Hyderabad − 500046, A. P., India
| | - E. Balaraman
- School of Chemistry, University of Hyderabad, Hyderabad − 500046, A. P., India
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17
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Matveenko M, Banwell MG, Willis AC. A chemoenzymatic total synthesis of the structure assigned to the alkaloid (+)-montabuphine. Org Lett 2008; 10:4693-6. [PMID: 18816123 DOI: 10.1021/ol801815k] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An enantioselective synthesis of the structure, 3, assigned to the alkaloid (+)-montabuphine has been achieved using the readily available metabolite 4 as starting material. A comparison of the physical and spectral data recorded on compound 3 with those reported for (+)-montabuphine suggests that they are different compounds.
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Affiliation(s)
- Maria Matveenko
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 0200, Australia
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18
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Abstract
Mander reductive alkylation of methyl 2-methoxybenzoate with prenyl bromide and hydrolysis of the enol ether afforded methyl 6-oxo-1-prenyl-2-cyclohexenecarboxylate. This was converted in five steps (reduction of the ketone, saponification, iodolactonization, ozonolysis, and intramolecular aldol reaction) to a spiro lactone cyclopentenal. An efficient first synthesis of (+/-)-vibralactone was completed by retro-iodolactonization with activated Zn, formation of the beta-lactone (vibralactone C), and reduction of the aldehyde. Except for the novel use of an iodolactone to protect both the prenyl double bond and carboxylic acid, no protecting groups were used. A similar sequence starting with asymmetric reductive alkylation of the (2S)-2-methoxymethoxymethylpyrrolidine amide of 2-methoxybenzoic acid with prenyl bromide afforded (-)-vibralactone confirming the absolute stereochemical assignment that was based on computational methods.
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Affiliation(s)
- Quan Zhou
- Department of Chemistry MS 015, Brandeis University, Waltham, Massachusetts 02454-9110, USA
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19
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Iranpoor N, Firouzabadi H, Khalili D, Motevalli S. Easily Prepared Azopyridines As Potent and Recyclable Reagents for Facile Esterification Reactions. An Efficient Modified Mitsunobu Reaction. J Org Chem 2008; 73:4882-7. [DOI: 10.1021/jo8000782] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nasser Iranpoor
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran
| | - Habib Firouzabadi
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran
| | - Dariush Khalili
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran
| | - Somayeh Motevalli
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran
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20
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Liu RH, Fang K, Wang B, Xu MH, Lin GQ. Concise Asymmetric Synthesis of (+)-CP-99,994 and (+)-L-733,060 via Efficient Construction of Homochiral syn-1,2-Diamines and syn-1,2-Amino Alcohols. J Org Chem 2008; 73:3307-10. [DOI: 10.1021/jo8002979] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Run-Hua Liu
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, Institutes of Biomedical Sciences, Fudan University, 138 Yixueyuan Road, Shanghai 200032, and Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
| | - Kai Fang
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, Institutes of Biomedical Sciences, Fudan University, 138 Yixueyuan Road, Shanghai 200032, and Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
| | - Bing Wang
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, Institutes of Biomedical Sciences, Fudan University, 138 Yixueyuan Road, Shanghai 200032, and Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
| | - Ming-Hua Xu
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, Institutes of Biomedical Sciences, Fudan University, 138 Yixueyuan Road, Shanghai 200032, and Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
| | - Guo-Qiang Lin
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, Institutes of Biomedical Sciences, Fudan University, 138 Yixueyuan Road, Shanghai 200032, and Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
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Abstract
Reductive alkylation of methyl 2-methoxybenzoate with prenyl bromide and hydrolysis afforded methyl 6-oxo-1-prenyl-2-cyclohexenecarboxylate. Reduction of the ketone, hydrolysis, iodolactonization, ozonolysis, and intramolecular aldol reaction provided a spiro lactone cyclopentenal. Retro-iodolactonization with activated Zn, formation of the beta-lactone, and reduction of the aldehyde completed an efficient first synthesis of (+/-)-vibralactone. No protecting groups were used except for the novel use of an iodolactone to protect both the prenyl double bond and carboxylic acid.
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Affiliation(s)
- Quan Zhou
- Department of Chemistry MS 015, Brandeis University, Waltham, Massachusetts 02454-9110, USA
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22
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But TYS, Toy PH. The Mitsunobu Reaction: Origin, Mechanism, Improvements, and Applications. Chem Asian J 2007; 2:1340-55. [PMID: 17890661 DOI: 10.1002/asia.200700182] [Citation(s) in RCA: 232] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The Mitsunobu reaction is a widely used and versatile method for the dehydrative oxidation-reduction condensation of an acid/pronucleophile usually with a primary or secondary alcohol that requires the combination of a reducing phosphine reagent together with an oxidizing azo reagent. The utility of this reaction stems from the fact that it is generally highly stereoselective and occurs with inversion of the stereochemical configuration of the alcohol starting material. Furthermore, as carboxylic acids, phenols, imides, sulfonamides, and other compounds can be used as the acid/pronucleophile, this reaction is useful for the preparation of a wide variety of functional groups. This Focus Review of the Mitsunobu reaction summarizes its origins, the current understanding of its mechanism, and recent improvements and applications.
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Affiliation(s)
- Tracy Yuen Sze But
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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23
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Prakash GKS, Chacko S, Alconcel S, Stewart T, Mathew T, Olah GA. Stereoselective monofluoromethylation of primary and secondary alcohols by using a fluorocarbon nucleophile in a Mitsunobu reaction. Angew Chem Int Ed Engl 2007; 46:4933-6. [PMID: 17523145 DOI: 10.1002/anie.200700834] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- G K Surya Prakash
- Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, University Park, Los Angeles, CA 90089-1661, USA
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Towards EPC-syntheses of the structural class of cochleamycins and macquarimicins. Part 1: EPC-synthesis of the hydrindene subunit of the cochleamycins. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.05.092] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Prakash G, Chacko S, Alconcel S, Stewart T, Mathew T, Olah G. Stereoselective Monofluoromethylation of Primary and Secondary Alcohols by Using a Fluorocarbon Nucleophile in a Mitsunobu Reaction. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200700834] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Strand D, Norrby PO, Rein T. Divergence en Route to Nonclassical Annonaceous Acetogenins. Synthesis of Pyranicin and Pyragonicin†. J Org Chem 2006; 71:1879-91. [PMID: 16496972 DOI: 10.1021/jo052233k] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Syntheses of the nonclassical annonaceous acetogenins, pyranicin, and pyragonicin from common late-stage intermediates are presented. The construction of key elements relies on asymmetric HWE reactions, including the desymmetrization of a meso-dialdehyde and a parallel kinetic resolution of a racemic aldehyde. A stereoconvergent Pd-catalyzed substitution serves to install the C4 stereocenter in protected form with different orthogonal protective groups. A divergent strategy to form 1,4- and 1,6-diols, employing stereoselective Zn-mediated alkynylations, is used for completion of the core structures. Notably, the stereoselective coupling reaction toward pyragonicin proceeds with highly functionalized fragments. The methodology is further expanded by a divergent synthesis of all stereoisomers of the 2,3,6-trisubstituted tetrahydropyran subunit.
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Affiliation(s)
- Daniel Strand
- KTH Chemical Science and Engineering, Organic Chemistry, SE-100 44 Stockholm, Sweden
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27
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Ermolenko L, Sasaki NA. Diastereoselective Synthesis of All Eight l-Hexoses from l-Ascorbic Acid. J Org Chem 2005; 71:693-703. [PMID: 16408982 DOI: 10.1021/jo0521192] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A novel versatile method for the synthesis of all eight diastereomerically pure L-hexoses was developed. L-Ascorbic acid was converted to two diastereomers A. These alpha-hydroxy esters were transformed into four gamma-alkoxy-alpha,beta-unsaturated esters C via the intermediates B and subsequent Wittig olefination reactions. Each one of compounds C was subjected to dihydroxylation to provide a set of two diols D. Anti/syn-differentiation in diol formation was manipulated by using (DHQD)2PHAL and (DHQ)2PHAL as chiral ligands. Further two-step reaction sequence affords all eight diastereopure L-hexoses.
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Affiliation(s)
- Ludmila Ermolenko
- Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
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28
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Bennett F, Saksena AK, Lovey RG, Liu YT, Patel NM, Pinto P, Pike R, Jao E, Girijavallabhan VM, Ganguly AK, Loebenberg D, Wang H, Cacciapuoti A, Moss E, Menzel F, Hare RS, Nomeir A. Hydroxylated analogues of the orally active broad spectrum antifungal, Sch 51048 (1), and the discovery of posaconazole [Sch 56592; 2 or (S,S)-5]. Bioorg Med Chem Lett 2005; 16:186-90. [PMID: 16260134 DOI: 10.1016/j.bmcl.2005.09.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2005] [Accepted: 09/08/2005] [Indexed: 10/25/2022]
Abstract
As part of a detailed study, the syntheses, biological activities, and pharmacokinetic properties of hydroxylated analogues of the previously described broad spectrum antifungal agents, Sch 51048 (1), Sch 50001 (3), and Sch 50002 (4), are described. Based on an overall superior profile, one of the alcohols, Sch 56592 (2), was selected for clinical studies.
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Affiliation(s)
- Frank Bennett
- Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, NJ 07033, USA.
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29
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Schenk S, Weston J, Anders E. Density Functional Investigation of the Mitsunobu Reaction. J Am Chem Soc 2005; 127:12566-76. [PMID: 16144404 DOI: 10.1021/ja052362i] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this article we performed an extensive density functional [BP86/6-311++G(3df,3pd) level] investigation of the hypersurface of the Mitsunobu reaction. Reaction of a phosphine with a dialkyl azodicarboxylate (first step in the Mitsunobu conversion) leads to either a five-membered oxadiazaphosphole ring (more stable) or a betaine. The subsequent formation of two stable intermediates, a dialkoxyphosphorane and an acyloxyalkoxyphosphorane, constitutes the second step in the mechanism. These intermediates are in equilibrium with each other (under exchange of alkoxy and acyloxy ligands), and both can undergo an acid-induced decomposition to yield the alkoxy- and/or acyloxyphosphonium salts. The alkoxyphosphonium salt generates the desired ester via a SN2 mechanism (inversion product). Alternatively, the phosphorus atom in a mixed acyloxyalkoxyphosphorane species can easily undergo Berry pseudorotation. A subsequent intramolecular substitution leads to the final ester via a retention mechanism. The hypersurface is much more complicated than previously assumed, and the Mitsunobu reaction is fundamentally capable of running under either inversion or retention. The possibility of selective stereocontrol is discussed. Side reactions include the formation of a degradation product and an anhydride.
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Affiliation(s)
- Stephan Schenk
- Institut für Organische Chemie und Makromolekulare Chemie der Friedrich-Schiller-Universität, Humboldtstrasse 10, D-07743 Jena, Germany
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30
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Nishiguchi GA, Little RD. From C-Glycosides to Pyranopyrans: An Approach to Thyrsiferol Using Titanium(III)-Promoted Redox Couplings. J Org Chem 2005; 70:5249-56. [PMID: 15960529 DOI: 10.1021/jo050465d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An approach to the pyranopyran ring system that is found in many natural products, including thyrsiferol, is described. The route entails the assembly of an alpha,beta-unsaturated ketone (11) from geraniol and dihydropyran (23) from acetyl acetaldehyde dimethyl acetal (19) and their titanium(III)-promoted coupling to afford a respectable 60% yield of keto alcohol 26. The sigma-bond formed in this process corresponds to the pro-C(9)-C(10) bond of thyrsiferol (4). Attempts to invert the stereochemistry at the pro-C(11) center were thwarted by the congestion imparted by the presence of the vicinal TBS-ether. Consequently, cyclization of the coupling adduct under conditions developed by Olah and Prakash and co-workers led to the cis-fused pyranopyran 27. X-ray analysis of this crystalline material confirmed each of the stereochemical assignments. After much effort, it was determined that the hydroxyl group at C(12) could be removed by treating the derived methyl xanthate with a tri-n-butylphosphine-borane complex under radical-forming conditions. The reaction sequence worked well, despite the hindered working environment and the presence of a potentially labile C-Br bond.
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Affiliation(s)
- Gisele A Nishiguchi
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, CA 93106, USA
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31
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Hanson JR, Mobbs DJ. An unusual intramolecular hydrogen transfer during the hydrolysis of a chloroacetoxy ester. JOURNAL OF CHEMICAL RESEARCH 2004. [DOI: 10.3184/0308234042563983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An intramolecular hydrogen transfer from the chloroacetoxy group has been shown to occur in the hydrolysis of the sesquiterpenoid derivative, 5β-chloroacetoxy-15-norpanasinsan-8-one leading to the formation of 5ββ,8α-dihydroxy-15-norpanasinsane.
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Affiliation(s)
- James R. Hanson
- Department of Chemistry, University of Sussex, Brighton, Sussex BN1 9QJ, UK
| | - Daniel J. Mobbs
- Department of Chemistry, University of Sussex, Brighton, Sussex BN1 9QJ, UK
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32
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Abstract
Complete details of an asymmetric synthesis of apicularen (1) are described. The synthesis has been accomplished using a highly diastereo- and enantioselective [4 + 2] annulation for the assembly of the functionalized pyran core. An underdeveloped lactonization method involving an NaH promoted transesterification of an advanced intermediate bearing an aryl cyanomethyl ester was used for the macrolactonization step.
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Affiliation(s)
- Qibin Su
- Department of Chemistry and Center for Chemical Methodology and Library Design, Metcalf Center for Science and Engineering, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
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33
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Abstract
5'-norcarbocyclic nucleosides have been found to possess a variety of meaningful biological properties. Derivatives of these compounds possessing substituents at the hydroxyl and heterocyclic ring bearing carbon atoms have not been described. As entries into these compounds, the 4'- and 1'-methyl derivatives of 5'-noraristeromycin (2 and 3) have been prepared from a common cyclopentyl precursor 8. The synthetic methods developed are adaptable to 5'-norcarbanucleosides possessing a variety of heterocyclic bases and in the l-like configuration. In turn, the products from such syntheses will lend themselves to a number of structural and biochemical investigations relevant to carbanucleosides in general. Compounds 2 and 3 lack antiviral properties and were not cytotoxic.
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Affiliation(s)
- Atanu Roy
- Department of Chemistry, Auburn University, Auburn, Alabama 36849-5312, USA
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34
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Arbelo DO, Castro-Rosario L, Prieto JA. Efficient Hydroxyl Inversion in Propionates via Cesium Carboxylates. SYNTHETIC COMMUN 2003. [DOI: 10.1081/scc-120023443] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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35
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Mouriès C, Deguin B, Koch M, Tillequin F. Stereoselective Conversion of Aucubin into Polyfunctionalized Tetrahydro-1H-cyclopenta[c]furan Glucosides. Helv Chim Acta 2003. [DOI: 10.1002/hlca.200390005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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36
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Wee AG. A dirhodium(II)-carbenoid route to (-)- and (+)-Geissman-Waiss lactone: synthesis of (1R,7R,8R)-(-)-turneforcidine. J Org Chem 2001; 66:8513-7. [PMID: 11735532 DOI: 10.1021/jo010753j] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
(-)- and (+)-Geissman-Waiss lactone, 4b, was efficiently prepared via the intramolecular C-H insertion reaction of the chiral nonracemic diazoacetates (-)-5a and (+)-5b catalyzed by dirhodium(II) tetrakis[methyl (5R and 5S)-3-phenylpropanoyl-2-imidazolidinone-5-carboxylate]. The cyclization was found to proceed with excellent regioselectivity and cis-diastereoselectivity. The bicyclic lactone (-)-4b was successfully used in the synthesis of the necine base, (-)-turneforcidine 2.
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Affiliation(s)
- A G Wee
- Department of Chemistry and Biochemistry, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada.
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37
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Abstract
The author's work in the past 10 years have been reviewed, focusing on their endeavor to find more effective and versatile reagents applicable to the Mitsunobu-type reactions. The project was originally planned to provide various N-alkyl-N-allylacylamides, the substrates for the aza-Claisen rearrangement the authors have developed. The effort was rewarded by more colorful results than expected originally, introducing to the chemical community two new series of reagents, that is, azodicarboxamides, such as TMAD and DHTD, and phosphoranes, such as CMBP and CMMP. The former series mediates the Mitsunobu reaction between primary alcohols and various protonic acids (N- and C-nucleophiles) of pKa up to 12, while the later, though needed a higher temperature, mediates the reactions of both primary and secondary alcohols with protonic acids of pKa of up to 23.5. Utilizing both the aza-Claisen rearrangement and new Mitsunobu reaction, a variety of natural products including isoirridomyrmecin, alpha-skytanthine, antimycin A3b as well as various alkaloids and pheromones were synthesized in reasonable ease.
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38
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Kobayashi S, Reddy RS, Sugiura Y, Sasaki D, Miyagawa N, Hirama M. Investigation of the total synthesis of N1999-A2: implication of stereochemistry. J Am Chem Soc 2001; 123:2887-8. [PMID: 11456978 DOI: 10.1021/ja003982g] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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39
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Burke SD, Jung KW, Lambert WT, Phillips JR, Klovning JJ. Halichondrin B: synthesis of the C(1)-C(15) subunit. J Org Chem 2000; 65:4070-87. [PMID: 10866625 DOI: 10.1021/jo000140r] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A short and efficient synthesis of the C(1)-C(15) subunit of halichondrin B in its natural configuration is described. The polycyclic caged ketal 3, containing nine asymmetric centers, is prepared in 14 steps from alpha-D-glucoheptonic acid gamma-lactone (7). Key steps in the two similar routes described include EtMgBr-promoted pinacol ring expansions of hydroxy mesylates 23 and 34, intramolecular Michael additions of 29 and 37, and a one-pot, HF-induced conversion of 4 to 3involving in situ silyl ether cleavage, acetal hydrolysis, Michael addition, and caged ketal formation. Alternative protocols for carbinol inversion at C(11), one early and one late in the synthetic sequence, are also described.
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Affiliation(s)
- S D Burke
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706-1396, USA.
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40
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41
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Bedjeguelal K, Joseph L, Bolitt V, Sinou D. Palladium-Mediated Cyclization on Carbohydrate Templates. 3. Extension of The Cyclization to the Threo Series. J Carbohydr Chem 2000. [DOI: 10.1080/07328300008544075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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42
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Sammakia T, Jacobs JS. Picolinic acid as a partner in the Mitsunobu reaction: Subsequent hydrolysis of picolinate esters under essentially neutral conditions with copper acetate in methanol. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00332-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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43
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Burke SD, Hong J, Lennox JR, Mongin AP. Synthetic Studies of Antitumor Macrolide Rhizoxin: Stereoselective Syntheses of the C(1)-C(9) and C(12)-C(26) Subunits. J Org Chem 1998; 63:6952-6967. [PMID: 11672317 DOI: 10.1021/jo980754k] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A triply convergent synthetic approach which culminates in the enantioselective syntheses of the C(1)-C(9) and C(12)-C(26) subunits of the macrolide antitumor agent rhizoxin is described. The central C(12)-C(20) subunit 4 has been prepared efficiently via diastereoselective enzymatic acetate hydrolysis of 15 with porcine pancreatic lipase, a chelation-controlled Ireland-Claisen rearrangement (10 --> 12) combined with kinetic bromolactonization (12 --> 14), and Mitsunobu inversion (23 --> 26) to introduce the three contiguous C(15)-C(17) stereocenters. Formation of the C(18)-C(19) trisubstituted (E)-olefin was achieved by a stereoselective Horner-Wadsworth-Emmons reaction. The central segment 4 and the oxazole chromophore side chain 3 were coupled using another highly stereoselective Horner-Wadsworth-Emmons reaction. Two different lactone subunits [C(1)-C(9) segment 5 and C(3)-C(10) segment 47] were also prepared, employing a thermodynamically controlled diastereotopic group differentiation tactic for establishing the C(5) stereochemistry.
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Affiliation(s)
- Steven D. Burke
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, and Department of Chemical Sciences, Wyeth-Ayerst Research, Princeton, New Jersey 08543-8000
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44
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Moineau C, Bolitt V, Sinou D. Synthesis of alpha- and beta-C-Aryl Delta(2)-Glycopyranosides from p-tert-Butylphenyl Delta(2)-Glycopyranosides via Grignard Reagents. J Org Chem 1998; 63:582-591. [PMID: 11672048 DOI: 10.1021/jo9714674] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Treatment of p-tert-butylphenyl 4,6-di-O-benzyl-2,3-dideoxy-alpha-D-erythro-hex-2-enopyranoside (1aalpha) or the 4,6-di-O-(tert-butyldimethylsilyl) analogue (1balpha) with various functionalized arylmagnesium bromides in the presence of a catalytic amount of PdCl(2)(dppf) at 25 degrees C in THF afforded the corresponding unsaturated C-arylglycosides 2-14 having the alpha-configuration in quite good yields. Benzyl-, allyl-, and vinylmagnesium bromides gave also the corresponding unsaturated alpha-C-glycosides 15-18, although in lower yields. When the same reaction was performed in the presence of NiCl(2)(dppe) as the catalyst at -40 degrees C, only the formation of the corresponding unsaturated C-arylglycosides having the beta-configuration was observed. As expected, reaction of phenylmagnesium bromide with p-tert-butylphenyl 4,6-di-O-benzyl-2,3-dideoxy-beta-D-erythro-hex-2-enopyranoside (1abeta) in the presence of NiCl(2)(dppe) gave only the unsaturated beta-C-phenylglycoside 2abeta, while palladium-catalyzed reaction led to the preponderant formation of C-phenylglycoside 2aalpha. Reaction of PhMgBr with p-tert-butylphenyl 4-O-benzyl-2,3,6-trideoxy-alpha-L-erythro-hex-2-enopyranoside (20) afforded stereospecifically the unsaturated alpha- and beta-C-phenylglycoside 25 in the presence of PdCl(2)(dppf) and NiCl(2)(dppe), respectively.
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Affiliation(s)
- Christophe Moineau
- Laboratoire de Synthèse Asymétrique, associé au CNRS, CPE Lyon, Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cédex, France
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45
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46
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Enantiospecific total synthesis of a novel arachidonic acid metabolite 3-hydroxyeicosatetraenoic acid. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(97)10565-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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47
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Venter P, Kock JL, Kumar GS, Botha A, Coetzee DJ, Botes PJ, Bhatt RK, Falck JR, Schewe T, Nigam S. Production of 3R-hydroxy-polyenoic fatty acids by the yeast Dipodascopsis uninucleata. Lipids 1997; 32:1277-83. [PMID: 9438238 DOI: 10.1007/s11745-006-0164-3] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Various fatty acids were fed to the yeast Dipodascopsis uninucleata UOFS Y 128, and the extracted samples were analyzed for the accumulation of 3-hydroxy metabolites with the help of electron impact gas chromatography-mass spectrometry. Fatty acids containing of 5Z,8Z-diene system (5Z,8Z,11Z-eicosatrienoic, 5Z,8Z,11Z,14Z-eicosatetraenoic, and 5Z,8Z,11Z,14Z,17Z-eicosapentaenoic acids) yielded the corresponding 3-hydroxy-all-Z-eicosapolyenoic acids. Moreover, linoleic acid (9Z,12Z-octadecadienoic acid) and 11Z,14Z,17Z-eicosatrienoic acid were converted to the 3-hydorxylated metabolites of shorter chain length, e,g., 3-hydroxy-5Z,8Z-tetradecadienoic acid and 3-hydroxy-5Z,8Z,11Z-tetradecatrienoic acid, respectively. In contrast, no accumulation of a 3-hydroxy metabolite was observed with oleic acid (9Z-octadecenoic acid), linolelaidic acid (9E,12E-octadecadienoic acid), gamma-linolenic acid (6Z,9Z,12Z-octadecatrienoic acid), and eicosanoic acid as substrate. These findings pinpoint that the 3-hydroxylation of a fatty acid in Dipodascopsis uninucleata requires a 5Z,8Z-diene system either directly or following initial incomplete beta-oxidation. Following analysis of the enantiomer composition, the arachidonic acid metabolite was identified as 3R-hydroxy-5Z,8Z,11Z,14Z-eicosatetraenoic acid, which rules out a normal beta-oxidation as biosynthetic route to this new class of oxylipins.
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Affiliation(s)
- P Venter
- Department of Microbiology & Biochemistry, University of Orange Free State Bloemfontein, South Africa
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48
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Shull BK, Sakai T, Nichols JB, Koreeda M. Mitsunobu Reaction of Unbiased Cyclic Allylic Alcohols. J Org Chem 1997; 62:8294-8303. [PMID: 11671964 DOI: 10.1021/jo9615155] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stereochemical inversion of unbiased allylic alcohols using triphenylphosphine, diethyl azodicarboxylate, and benzoic acid, commonly known as the Mitsunobu reaction, was studied in three different solvents with specific attention toward the product composition. The results generated for the Mitsunobu reaction of (R)-3-deuterio-2-cyclohexen-1-ol and the cis and trans isomers of 1-deuterio-5-methyl-2-cyclohexen-1-ol, 1-deuterio-5-tert-butyl-2-cyclohexen-1-ol, and optically active cis and trans 5-isopropyl-2-methyl-2-cyclohexen-1-ol all gave similar product distributions with respect to inversion and retention at the carbinol center as well-as syn and anti S(N)2' type addition when THF or benzene was used as the solvent (CH(2)Cl(2) gave less selective product distributions). Interestingly, it was found that the quasi-equatorial and quasi-axial nature of the starting allylic alcohol does not appear to affect the product distribution for this reaction, nor does methyl substitution at the central carbon of the allylic alcohol. In all cases, significant amounts (8-28%) of non-S(N)2 type products were detected for these sterically unbiased allylic alcohols; only 72-77% of the product was from S(N)2 type reaction when sterically undemanding (R)-3-deuterio-2-cyclohexen-1-ol was subjected to Mitsunobu conditions.
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Affiliation(s)
- Brian K. Shull
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
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49
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Nguefack JF, Bolitt V, Sinou D. Palladium-Mediated Cyclization on Carbohydrate Templates. 1. Synthesis of Enantiopure Bicyclic Compounds. J Org Chem 1997. [DOI: 10.1021/jo961881o] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-Flaubert Nguefack
- Laboratoire de Synthèse Asymétrique, UMR 5622, CPE Lyon, Université Claude Bernard Lyon I, 43 boulevard du 11 Novembre 1918, 69622 Villeurbanne Cédex, France
| | - Véronique Bolitt
- Laboratoire de Synthèse Asymétrique, UMR 5622, CPE Lyon, Université Claude Bernard Lyon I, 43 boulevard du 11 Novembre 1918, 69622 Villeurbanne Cédex, France
| | - Denis Sinou
- Laboratoire de Synthèse Asymétrique, UMR 5622, CPE Lyon, Université Claude Bernard Lyon I, 43 boulevard du 11 Novembre 1918, 69622 Villeurbanne Cédex, France
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50
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De Mesmaeker A, Lesueur C, Bévièrre MO, Waldner A, Fritsch V, Wolf RM. Stark erhöhte Affinität modifizierter Oligonucleotide mit in ihrer Konformation eingeschränkten Furanose-Ringen für komplementäre RNA-Stränge. Angew Chem Int Ed Engl 1996. [DOI: 10.1002/ange.19961082313] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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