1
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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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2
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Novotná M, Raschmanová JŠ, Martinková M, Pilátová MB, Kuchár J, Litecká M, Jáger D. Synthesis and in vitro antiproliferative profile of novel isomeric aza-analogues of natural jaspine B. Tetrahedron 2022. [DOI: 10.1016/j.tet.2021.132570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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3
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Gamboa Marin OJ, Hussain N, Ravicoularamin G, Ameur N, Gormand P, Sauvageau J, Gauthier C. Total Synthesis of 6-Amino-2,6-dideoxy-α-Kdo from d-Mannose. Org Lett 2020; 22:5783-5788. [DOI: 10.1021/acs.orglett.0c01847] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Oscar Javier Gamboa Marin
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boul. des Prairies, Laval, Québec, Canada H7V 1B7
| | - Nazar Hussain
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boul. des Prairies, Laval, Québec, Canada H7V 1B7
| | - Gokulakrishnan Ravicoularamin
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boul. des Prairies, Laval, Québec, Canada H7V 1B7
| | - Nassima Ameur
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boul. des Prairies, Laval, Québec, Canada H7V 1B7
| | - Paul Gormand
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boul. des Prairies, Laval, Québec, Canada H7V 1B7
| | - Janelle Sauvageau
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boul. des Prairies, Laval, Québec, Canada H7V 1B7
- National Research Council Canada (NRC), 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6
| | - Charles Gauthier
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boul. des Prairies, Laval, Québec, Canada H7V 1B7
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4
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Reddy PO, Reddy AA, Prasad KR. Stereoselective Synthesis of β-Amino Ynones by the Addition of Alkynones to Nonracemic Sulfinimines: Formal Total Synthesis of l- Xylo and l- Arabino Phytosphingosines. J Org Chem 2020; 85:2743-2751. [PMID: 31913627 DOI: 10.1021/acs.joc.9b02938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The addition of silyl enol ethers obtained from ynones to sulfinimines furnished the corresponding β-sulfinamido ynones in a very good yield and diastereoselectivity. The formed ynones serve as precursors amenable for the synthesis of bioactive compounds. This has been illustrated in the synthesis of l-xylo and l-arabino phytosphingosines.
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Affiliation(s)
- Polimera Obula Reddy
- Department of Organic Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - Arava Amaranadha Reddy
- Department of Organic Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - Kavirayani R Prasad
- Department of Organic Chemistry , Indian Institute of Science , Bangalore 560012 , India
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5
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Raschmanová JŠ, Martinková M, Gonda J, Pilátová MB, Kuchár J, Jáger D. Synthesis and in vitro biological evaluation of 3-amino-3-deoxydihydrosphingosines and their analogues. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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6
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Jacková D, Brunderová M, Fábian M, Martinková M, Gonda J, Pilátová MB. Synthesis and anticancer profile of novel sphingoid base-like compounds with a quaternary stereocentre. Carbohydr Res 2019; 487:107862. [PMID: 31734523 DOI: 10.1016/j.carres.2019.107862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/05/2019] [Accepted: 11/05/2019] [Indexed: 11/30/2022]
Abstract
The synthesis of novel sphingoid base-like compounds with a quaternary stereocentre was achieved in a sequence featuring [3,3]-sigmatropic rearrangements and olefin cross-metathesis transformation as the key reaction steps, which were accompanied by the rational selection of suitable functional group transformations. The stereochemistry of the desired tetra-substituted carbon bearing nitrogen functionality was determined via NOESY experiments of the advanced oxazolidine-2-thiones. Cell viability experiments revealed significant antiproliferative/cytotoxic activity of the target compounds 7, ent-7 and 29 against the Jurkat cell line, with the IC50 values of 6.6 μM, 5.6 μM and 6.1 μM, respectively.
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Affiliation(s)
- Dominika Jacková
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic
| | - Mária Brunderová
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic
| | - Martin Fábian
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic
| | - Miroslava Martinková
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic.
| | - Jozef Gonda
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic
| | - Martina Bago Pilátová
- Institute of Pharmacology, Faculty of Medicine, P.J. Šafárik University, SNP 1, 040 66, Košice, Slovak Republic
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7
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Lee H, Park Y, Jung H, Kim ST, Sin S, Ko E, Myeong IS, Moon H, Suhl CH, Jung Y, Jung E, Lee J, Lee KY, Oh CY, Song J, Yoon SH, Kang W, Jung J, Shin H. Synthesis of the C1–C13 fragment of eribulin mesylate. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.06.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Čonková M, Martinková M, Gonda J, Jacková D, Pilátová MB, Kupka D, Jáger D. Stereoselective synthesis and antiproliferative activity of the isomeric sphinganine analogues. Carbohydr Res 2019; 472:76-85. [PMID: 30529492 DOI: 10.1016/j.carres.2018.09.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 09/27/2018] [Accepted: 09/27/2018] [Indexed: 12/21/2022]
Abstract
A flexible synthetic approach to biologically active sphingoid base-like compounds with a 3-amino-1,2-diol framework was achieved through a [3,3]-sigmatropic rearrangement and late stage olefin cross-metathesis as the key transformations. The stereochemistry of the newly created stereogenic centre was assigned via a single crystal X-ray analysis of the (4S,5R)-5-(hydroxymethyl)-4-vinyloxazolidine-2-thione. In order to rationalise the observed stereoselectivity of the aza-Claisen rearrangement, DFT calculations were carried out. The targeted isomeric sphingoid bases were screened in vitro for anticancer activity on a panel of seven human malignant cell lines. Cell viability experiments revealed that C17-homologues are more active than their C12 congeners.
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Affiliation(s)
- Miroslava Čonková
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic
| | - Miroslava Martinková
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic.
| | - Jozef Gonda
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic
| | - Dominika Jacková
- Institute of Chemical Sciences, Department of Organic Chemistry, P.J. Šafárik University, Moyzesova 11, 040 01, Košice, Slovak Republic
| | - Martina Bago Pilátová
- Institute of Pharmacology, Faculty of Medicine, P.J. Šafárik University, SNP 1, 040 66, Košice, Slovak Republic
| | - Daniel Kupka
- Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01, Košice, Slovak Republic
| | - Dávid Jáger
- Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01, Košice, Slovak Republic
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9
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Gonda J, Široký M, Martinková M, Homolya S, Vilková M, Pilátová MB, Šesták S. Synthesis and biological activity of diastereoisomeric octahydro-1H-indole-5,6,7-triols, analogues of castanospermine. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.12.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Gonda J, Fazekašová S, Martinková M, Mitríková T, Roman D, Pilátová MB. Synthesis and biological activity of sphingosines with integrated azobenzene switches. Org Biomol Chem 2019; 17:3361-3373. [DOI: 10.1039/c9ob00137a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of photochromic active sphingosine analogues and their antiproliferative activity against seven human cancer cell lines is reported.
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Affiliation(s)
- Jozef Gonda
- Department of Organic Chemistry
- P.J. Šafárik University
- Sk-040 01 Košice
- Slovak Republic
| | - Simona Fazekašová
- Department of Organic Chemistry
- P.J. Šafárik University
- Sk-040 01 Košice
- Slovak Republic
| | - Miroslava Martinková
- Department of Organic Chemistry
- P.J. Šafárik University
- Sk-040 01 Košice
- Slovak Republic
| | - Tatiana Mitríková
- Department of Organic Chemistry
- P.J. Šafárik University
- Sk-040 01 Košice
- Slovak Republic
| | - Dávid Roman
- Chemical Biology of Microbe-Host Interactions
- Leibniz Institute for Natural Product Research and Infection Biology e.V
- Hans-Knöll-Institute (HKI)
- 07745 Jena
- Germany
| | - Martina Bago Pilátová
- Institute of Pharmacology
- Faculty of Medicine
- P.J. Šafárik University
- 040 66 Košice
- Slovak Republic
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11
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Raschmanová JŠ, Martinková M, Gonda J, Pilátová MB, Kupka D, Jáger D. Synthesis of the cytotoxic phytosphingosines and their isomeric analogues. Carbohydr Res 2018; 468:1-12. [DOI: 10.1016/j.carres.2018.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 08/03/2018] [Accepted: 08/03/2018] [Indexed: 01/26/2023]
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12
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Rocha DHA, Pinto DCGA, Silva AMS. Applications of the Wittig Reaction on the Synthesis of Natural and Natural-Analogue Heterocyclic Compounds. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800523] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Djenisa H. A. Rocha
- Department of Chemistry & QOPNA; University of Aveiro; Campus de Santiago 3810-193 Aveiro Portugal
| | - Diana C. G. A. Pinto
- Department of Chemistry & QOPNA; University of Aveiro; Campus de Santiago 3810-193 Aveiro Portugal
| | - Artur M. S. Silva
- Department of Chemistry & QOPNA; University of Aveiro; Campus de Santiago 3810-193 Aveiro Portugal
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13
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Jacková D, Martinková M, Gonda J, Stanková K, Bago Pilátová M, Herich P, Kožíšek J. The convergent synthesis and anticancer activity of broussonetinines related analogues. Carbohydr Res 2017; 451:59-71. [PMID: 28965067 DOI: 10.1016/j.carres.2017.09.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 09/14/2017] [Accepted: 09/14/2017] [Indexed: 11/25/2022]
Abstract
The convergent synthesis of broussonetinines related congeners 3 and 4 with the simple C13 alkyl side chain and differently configured pyrrolidine skeleton has been achieved. Our approach relied on the [3,3]-sigmatropic rearrangements of chiral allylic substrates derived from d-xylose. Cross metathesis of the common oxazolidinone intermediates 7 and 8 with tridec-1-ene followed by alkylative cyclization completed the construction of both C-alkyl iminosugars. The targeted compounds 3 and 4 were screened for antiproliferative/cytotoxic activities against multiple cancer cell lines by MTT assay. Compound 3 exhibited very good in vitro potency on Caco-2 and Jurkat cell lines with IC50 value of 5.1 μM and 5.8 μM, respectively.
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Affiliation(s)
- Dominika Jacková
- Institute of Chemical Sciences, Department of Organic Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, 040 01 Košice, Slovak Republic
| | - Miroslava Martinková
- Institute of Chemical Sciences, Department of Organic Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, 040 01 Košice, Slovak Republic.
| | - Jozef Gonda
- Institute of Chemical Sciences, Department of Organic Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, 040 01 Košice, Slovak Republic
| | - Kvetoslava Stanková
- Institute of Chemical Sciences, Department of Organic Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, 040 01 Košice, Slovak Republic
| | - Martina Bago Pilátová
- Institute of Pharmacology, Faculty of Medicine, P.J. Šafárik University, SNP 1, 040 66 Košice, Slovak Republic
| | - Peter Herich
- Institute of Physical Chemistry and Chemical Physics, Department of Physical Chemistry, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic; Central Laboratories, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic
| | - Jozef Kožíšek
- Institute of Physical Chemistry and Chemical Physics, Department of Physical Chemistry, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic
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Liu B, Hashimoto K, Nambu H, Fujiwara T, Yakura T. Synthetic Studies on a Pachastrissamine Sulfur Analogue: Synthesis of a 4-epi-Sulfur Analogue. Chem Pharm Bull (Tokyo) 2016; 64:366-70. [PMID: 27039834 DOI: 10.1248/cpb.c15-00996] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A versatile synthetic procedure for a sulfur analogue of pachastrissamine (jaspine B), which involves the tandem thiolation-cyclization of a 1,4-ditosylate to construct a tetrahydrothiophene ring, was developed. Nucleophilic amino substitution of a tetrahydrothiophene-4-sulfonate with unexpected retention of the configuration afforded the sulfur analogue of 4-epi-pachastrissamine.
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Affiliation(s)
- Bo Liu
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
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15
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Marine cytotoxic jaspine B and its stereoisomers: biological activity and syntheses. Carbohydr Res 2016; 423:1-42. [DOI: 10.1016/j.carres.2016.01.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 01/11/2016] [Accepted: 01/20/2016] [Indexed: 01/03/2023]
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16
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Mezeiová E, Martinková M, Stanková K, Fabišíková M, Gonda J, Pilátová M, Gönciová G. Total synthesis and antiproliferative/cytotoxic profiling of 2-epi-jaspine B. Carbohydr Res 2016; 423:70-81. [DOI: 10.1016/j.carres.2016.01.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/15/2016] [Accepted: 01/21/2016] [Indexed: 11/16/2022]
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17
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Fujiwara T, Liu B, Niu W, Hashimoto K, Nambu H, Yakura T. Practical Synthesis of Pachastrissamine (Jaspine B), 2-epi-Pachastrissamine, and the 2-epi-Pyrrolidine Analogue. Chem Pharm Bull (Tokyo) 2016; 64:179-88. [PMID: 26833446 DOI: 10.1248/cpb.c15-00816] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The practical syntheses of pachastrissamine (jaspine B), 2-epi-pachastrissamine, and the 2-epimer of the pyrrolidine analogue were accomplished via the stereoselective reduction of an allylketone derived from commercially available diethyl D-tartrate and the cross-metathesis of an allyltetrahydrofuran or allypyrrolidine with 1-tridecene as key steps.
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Affiliation(s)
- Tomoya Fujiwara
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
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18
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Stanková K, Martinková M, Gonda J, Bago M, Pilátová M, Gönciová G. The convergent total synthesis of cytotoxic homospisulosine and its 3-epi-analogue. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.11.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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19
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Total synthesis of pachastrissamine together with its 4-epi-congener via [3,3]-sigmatropic rearrangements and antiproliferative/cytotoxic evaluation. Carbohydr Res 2015; 402:6-24. [DOI: 10.1016/j.carres.2014.11.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 11/10/2014] [Accepted: 11/17/2014] [Indexed: 11/24/2022]
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20
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Synthesis and preliminary biological evaluation of 1,2,3-triazole-Jaspine B hybrids as potential cytotoxic agents. Eur J Med Chem 2014; 80:593-604. [DOI: 10.1016/j.ejmech.2014.03.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 12/27/2013] [Accepted: 03/08/2014] [Indexed: 11/19/2022]
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21
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Martinková M, Mezeiová E, Gonda J, Jacková D, Pomikalová K. Total synthesis of (−)-jaspine B and its 4-epi-analogue from d-xylose. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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22
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Schmiedel VM, Stefani S, Reissig HU. Stereodivergent synthesis of jaspine B and its isomers using a carbohydrate-derived alkoxyallene as C3-building block. Beilstein J Org Chem 2013; 9:2564-9. [PMID: 24367420 PMCID: PMC3869275 DOI: 10.3762/bjoc.9.291] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 10/28/2013] [Indexed: 12/29/2022] Open
Abstract
Herein we present the synthesis of the anhydrophytosphingosine jaspine B and three of its stereoisomers using a carbohydrate-derived alkoxyallene in order to obtain the products in enantiopure form. Key step of the reaction sequence is the addition of the lithiated alkoxyallene to pentadecanal, setting the configuration at the later C-2 of the ring system. This reaction step proceeds with moderate selectivity and therefore leads to a stereodivergent approach to the natural product and its enantiomer. The gold-catalyzed 5-endo-cyclization affords the corresponding dihydrofurans, which after separation, azidation of the enol ether moiety and two subsequent reduction steps give the natural product and its stereoisomers.
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Affiliation(s)
- Volker Martin Schmiedel
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
| | - Stefano Stefani
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
| | - Hans-Ulrich Reissig
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
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