1
|
Mantel M, Giesler M, Guder M, Rüthlein E, Hartmann L, Pietruszka J. Lewis‐Base‐Brønsted‐Säure‐Enzym‐Katalyse in enantioselektiven mehrstufigen Eintopf‐Synthesen. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Marvin Mantel
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
| | - Markus Giesler
- Institut für Organische und Makromolekulare Chemie Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Deutschland
| | - Marian Guder
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1) Forschungszentrum Jülich GmbH 52428 Jülich Deutschland
| | - Elisabeth Rüthlein
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
| | - Laura Hartmann
- Institut für Organische und Makromolekulare Chemie Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Deutschland
| | - Jörg Pietruszka
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1) Forschungszentrum Jülich GmbH 52428 Jülich Deutschland
| |
Collapse
|
2
|
Mantel M, Giesler M, Guder M, Rüthlein E, Hartmann L, Pietruszka J. Lewis Base-Brønsted Acid-Enzyme Catalysis in Enantioselective Multistep One-Pot Syntheses. Angew Chem Int Ed Engl 2021; 60:16700-16706. [PMID: 33856095 PMCID: PMC8360128 DOI: 10.1002/anie.202103406] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/08/2021] [Indexed: 12/23/2022]
Abstract
Establishing one-pot, multi-step protocols combining different types of catalysts is one important goal for increasing efficiency in modern organic synthesis. In particular, the high potential of biocatalysts still needs to be harvested. Based on an in-depth mechanistic investigation of a new organocatalytic protocol employing two catalysts {1,4-diazabicyclo[2.2.2]octane (DABCO); benzoic acid (BzOH)}, a sequence was established providing starting materials for enzymatic refinement (ene reductase; alcohol dehydrogenase): A gram-scale access to a variety of enantiopure key building blocks for natural product syntheses was enabled utilizing up to six catalytic steps within the same reaction vessel.
Collapse
Affiliation(s)
- Marvin Mantel
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
| | - Markus Giesler
- Institut für Organische und Makromolekulare ChemieHeinrich-Heine-Universität Düsseldorf40225DüsseldorfGermany
| | - Marian Guder
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1)Forschungszentrum Jülich GmbH52428JülichGermany
| | - Elisabeth Rüthlein
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
| | - Laura Hartmann
- Institut für Organische und Makromolekulare ChemieHeinrich-Heine-Universität Düsseldorf40225DüsseldorfGermany
| | - Jörg Pietruszka
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1)Forschungszentrum Jülich GmbH52428JülichGermany
| |
Collapse
|
3
|
Abstract
The synthesis of desepoxy‐tedanolide C was accomplished and provided experimental evidence on the configuration of tedanolide C. The reported chemical shifts and coupling constants point to a configuration different from the published structure and analogous to the structures of the other members of this family of natural products. The key step is a Kiyooka aldol protocol for the stereoselective synthesis of the tertiary alcohol flanked by three additional oxygenated carbon atoms. Furthermore, two additional aldol reactions and a Julia–Kocienski olefination were used to assemble the carbon framework.
Collapse
Affiliation(s)
- Daniel Lücke
- Institute of Organic Chemistry, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany
| | - Markus Kalesse
- Institute of Organic Chemistry, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany.,Centre of Biomolecular Drug Research (BMWZ), Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 38, 30167, Hannover, Germany.,Helmholtz Centre for Infection Research (HZI), Inhoffenstrasse 7, 38124, Braunschweig, Germany
| |
Collapse
|
4
|
Abstract
A short and convergent strategy for the stereoselective total synthesis of biologically active natural product carolacton has been accomplished. Our synthesis highlights the Urpi acetal aldol, Crimmins aldol, Ireland-Claisen rearrangement, TiCl4-assisted aldol followed by β-hydroxy elimination to construct C7-C8 olefin, and ring-closing metathesis as the key steps for achieving the target molecule with an overall yield of 18.8%.
Collapse
Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| |
Collapse
|
5
|
Naini A, Fohrer J, Kalesse M. The Synthesis of Desepoxy-Isotedanolide - A Potential Biosynthetic Precursor of Tedanolide. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500568] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
6
|
Naini A, Muthukumar Y, Raja A, Franke R, Harrier I, Smith AB, Lee D, Taylor RE, Sasse F, Kalesse M. Die Synthese und biologische Validierung von Desepoxyisotedanolid und dessen Vergleich mit Desepoxytedanolid. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
7
|
Naini A, Muthukumar Y, Raja A, Franke R, Harrier I, Smith AB, Lee D, Taylor RE, Sasse F, Kalesse M. The synthesis and biological evaluation of desepoxyisotedanolide and a comparison with desepoxytedanolide. Angew Chem Int Ed Engl 2015; 54:6935-9. [PMID: 25914374 DOI: 10.1002/anie.201501526] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Indexed: 11/10/2022]
Abstract
The tedanolides are biologically active polyketides that exhibit a macrolactone constructed from a primary alcohol. Since polyketidal transformations only generate secondary alcohols, it has been hypothesized by Taylor that this unique lactone could arise from a postketidal transesterification. In order to probe this hypothesis and to investigate the biological profile of the putative precursor of all members of the tedanolide family, we embarked on the synthesis of desepoxyisotedanolide and its biological evaluation in comparison to desepoxytedanolide. The biological experiments unraveled a second target for desepoxytedanolide and provided evidence that the proposed transesterification indeed provides a survival advantage for the producing microorganism.
Collapse
Affiliation(s)
- Arun Naini
- Institute for Organic Chemistry, Leibniz Universität Hannover and Centre of Biomolecular Drug Research (BMWZ), Schneiderberg 1B, 30655 Hannover (Germany)
| | - Yazh Muthukumar
- Department of Chemical Biology, Helmholtz Centre for Infection Research (HZI), Inhoffenstr. 7, Braunschweig (Germany)
| | - Aruna Raja
- Department of Chemical Biology, Helmholtz Centre for Infection Research (HZI), Inhoffenstr. 7, Braunschweig (Germany)
| | - Raimo Franke
- Department of Chemical Biology, Helmholtz Centre for Infection Research (HZI), Inhoffenstr. 7, Braunschweig (Germany)
| | - Ian Harrier
- Department of Chemistry & Biochemistry and Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN 46556-567 (USA)
| | - Amos B Smith
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104 (USA)
| | - Dongjoo Lee
- College of Pharmacy, Ajou University, 206 Worldcup-ro, Yeongtong-gu, Suwon 443-749 (Korea)
| | - Richard E Taylor
- Department of Chemistry & Biochemistry and Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN 46556-567 (USA)
| | - Florenz Sasse
- Department of Chemical Biology, Helmholtz Centre for Infection Research (HZI), Inhoffenstr. 7, Braunschweig (Germany)
| | - Markus Kalesse
- Institute for Organic Chemistry, Leibniz Universität Hannover and Centre of Biomolecular Drug Research (BMWZ), Schneiderberg 1B, 30655 Hannover (Germany).
| |
Collapse
|
8
|
Yin Z, Liu Z, Huang Z, Chu Y, Chu Z, Hu J, Gao L, Song Z. Synthesis of Functionalized γ-Lactone via Sakurai exo-Cyclization/Rearrangement of 3,3-Bis(silyl) Enol Ester with a Tethered Acetal. Org Lett 2015; 17:1553-6. [PMID: 25730288 DOI: 10.1021/acs.orglett.5b00437] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Zhiping Yin
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Zengjin Liu
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Zhenggang Huang
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Yang Chu
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Zhiwen Chu
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Jia Hu
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Lu Gao
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Zhenlei Song
- Key Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
- State Key Laboratory of Biotherapy, West
China Hospital, Sichuan University, Chengdu 610041, P. R. China
| |
Collapse
|
9
|
Li L, Ye X, Wu Y, Gao L, Song Z, Yin Z, Xu Y. Sakurai reaction of 3,3-bis(silyl) silyl enol ethers with acetals involving selective desilylation of the geminal bis(silane). Concise synthesis of nematocidal oxylipid. Org Lett 2013; 15:1068-71. [PMID: 23398287 DOI: 10.1021/ol400069p] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
3,3-Bis(silyl) silyl enol ethers have been shown to exhibit predominantly Sakurai reactivity, rather than Mukaiyama aldol reactivity, in their Lewis acid promoted reactions with acetals. Starting from a geminal bis(silyl) moiety consisting of two different silyl groups, such as SiMe(3) and SiMe(2)Ph, the SiMe(3) is selectively eliminated to give monoprotected E- vinylsilyl diols with good to excellent syn-diastereoselectivity. This reaction also underpinned a synthesis of the nematocidal oxylipid from Notheia anomala, demonstrating the attractive bifunctionality of geminal bis(silanes).
Collapse
Affiliation(s)
- Linjie Li
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | | | | | | | | | | | | |
Collapse
|
10
|
Anderl T, Nicolas L, Münkemer J, Muthukumar Y, Baro A, Frey W, Sasse F, Taylor RE, Laschat S. Synthesis and Biological Evaluation of Gephyronic Acid Derivatives: Initial Steps towards the Identification of the Biological Target of Polyketide Inhibitors of Eukaryotic Protein Synthesis. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
11
|
Anderl T, Nicolas L, Münkemer J, Baro A, Sasse F, Steinmetz H, Jansen R, Höfle G, Taylor RE, Laschat S. Gephyronic acid, a missing link between polyketide inhibitors of eukaryotic protein synthesis (part II): Total synthesis of gephyronic acid. Angew Chem Int Ed Engl 2010; 50:942-5. [PMID: 21246697 DOI: 10.1002/anie.201005605] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Indexed: 11/10/2022]
Affiliation(s)
- Timo Anderl
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Magano J, Acciacca A, Akin A, Collman BM, Conway B, Waldo M, Chen MH, Mennen KE. The Synthesis of a Dopamine D2 Partial Agonist for the Treatment of Schizophrenia. Org Process Res Dev 2009. [DOI: 10.1021/op800307k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Javier Magano
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| | - Alison Acciacca
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| | - Anne Akin
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| | - Benjamin M. Collman
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| | - Brian Conway
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| | - Michael Waldo
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| | - Michael H. Chen
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| | - Kenneth E. Mennen
- Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, U.S.A
| |
Collapse
|
13
|
Dunetz JR, Julian LD, Newcom JS, Roush WR. Total syntheses of (+)-tedanolide and (+)-13-deoxytedanolide. J Am Chem Soc 2008; 130:16407-16. [PMID: 18980317 PMCID: PMC2645944 DOI: 10.1021/ja8063205] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Convergent total syntheses of the potent cytotoxins (+)-tedanolide (1) and (+)-13-deoxytedanolide (2) are described. The carbon framework of these compounds was assembled via a stereoselective aldol reaction that unifies the C(1)-C(12) ketone fragment 5 with a C(13)-C(23) aldehyde fragment 6 (for 13-deoxytedanolide) or 52 (for tedanolide). Multiple obstacles were encountered en route to (+)-1 and (+)-2 that required very careful selection and orchestration of the stereochemistry and functionality of key intermediates. Chief among these issues was the remarkable stability and lack of reactivity of hemiketals 33b and 34 that prevented the tedanolide synthesis from being completed from aldol 4. Key to the successful completion of the tedanolide synthesis was the observation that the 13-deoxy hemiketal 36 could be oxidized to C(11,15)-diketone 38 en route to 13-deoxytedanolide. This led to the decision to pursue the tedanolide synthesis via C(15)-(S)-epimers, since this stereochemical change would destabilize the hemiketal that plagued the attempted synthesis of tedanolide via C(15)-(R) intermediates. However, use of C(15)-(S)-configured intermediates required that the side-chain epoxide be introduced very late in the synthesis, owing to the ease with which the C(15)-(S)-OH cyclized onto the epoxide of intermediate 50.
Collapse
Affiliation(s)
- Joshua R Dunetz
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, USA
| | | | | | | |
Collapse
|
14
|
|
15
|
Ehrlich G, Hassfeld J, Eggert U, Kalesse M. The total synthesis of (+)-tedanolide--A macrocyclic polyketide from marine sponge Tedania ignis. Chemistry 2008; 14:2232-47. [PMID: 18165955 DOI: 10.1002/chem.200701529] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Tedanolide, which was isolated by Schmitz in 1984 from the marine sponge Tedania ignis, is a highly cytotoxic macrolide leading to strong growth inhibition of P338 tumor cells in bioassays. A unique structural feature of the known tedanolides is the primary hydroxyl group incorporated in the macrolactone. This unusual motif for macrolactones originated from PKS biosynthesis might arise through lactonizations others than those derived by the thioesterase reaction. First experimental data that support this hypothesis and reflect the inherent preference of PKS-induced macrolactonization were obtained during this synthesis. The inherent preference for the formation of a 14-membered macrocyclization is discussed together with the pivotal steps in the synthesis.
Collapse
Affiliation(s)
- Gunnar Ehrlich
- Institut für Organische Chemie, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | | | | | | |
Collapse
|
16
|
Dunetz JR, Roush WR. Concerning the synthesis of the tedanolide C(13)-C(23) fragment via anti-aldol reaction. Org Lett 2008; 10:2059-62. [PMID: 18422319 DOI: 10.1021/ol800546g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Synthesis of C(13)-C(23) aldehyde 4, an important intermediate in a planned total synthesis of tedanolide, is described. The stereoselectivity of the key anti-aldol reaction of aldehyde 5 and ketone 6 (en route to 4) perfectly tracks the enantiomeric purity of 5. It is demonstrated that aldehyde 24, a precursor of 5, undergoes facile epimerization during a Swern oxidation and stabilized ylide olefination sequence.
Collapse
Affiliation(s)
- Joshua R Dunetz
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, USA
| | | |
Collapse
|
17
|
Jung ME, Yoo D. Synthesis of the C1–C12 fragment of the tedanolides. Selective hydroboration–protonation of allylic alcohol approach. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.11.181] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
18
|
|
19
|
Affiliation(s)
- Marco Lombardo
- Dipartimento di Chimica "G. Ciamician", Università degli Studi di Bologna, via Selmi 2, 40126 Bologna, Italy.
| | | |
Collapse
|
20
|
Studies toward the total synthesis of tedanolide: stereoselective synthesis of the C(8)–C(17) segment. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.06.173] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
21
|
Wong CM, Loh TP. Synthetic studies toward the total synthesis of tedanolide: assembly of the C1–C23 carbon backbone. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.04.044] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
22
|
Iwata Y, Tanino K, Miyashita M. Synthetic studies of tedanolide, a marine macrolide displaying potent antitumor activity. Stereoselective synthesis of the C13-C23 segment. Org Lett 2006; 7:2341-4. [PMID: 15932193 DOI: 10.1021/ol050569a] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure: see text] A highly stereoselective synthesis of the C13-C23 segment of tedanolide (1), an 18-membered macrolide isolated from the Caribbean sponge Tedania ignis, displaying significant cytotoxicity against KB and PS tumor cell lines, is described which involves two stereoselective epoxidations of regioisomeric trisubstituted double bonds and a stereospecific S(N)2' methylation reaction of a trans-gamma,delta-epoxy-cis-alpha,beta-unsaturated ester as the key steps.
Collapse
Affiliation(s)
- Yasuhiro Iwata
- Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | | | | |
Collapse
|
23
|
Abstract
A total synthesis of 13-deoxytedanolide is described. The synthesis features a highly stereoselective fragment assembly aldol reaction of methyl ketone 4 and aldehyde 5 to establish the complete carbon skeleton of the natural product in the form of aldol 15. The facile formation of the remarkably unreactive hemiketal 16 thwarted attempts to elaborate 15 to tedanolide. However, deoxygenation of the C(13)-hydroxyl of 16 provided the 13-deoxy hemiketal 17 that was smoothly elaborated to 13-deoxytedanolide.
Collapse
Affiliation(s)
- Lisa D Julian
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA
| | | | | |
Collapse
|
24
|
Smith AB, Adams CM, Barbosa SAL, Degnan AP. A unified approach to the tedanolides: total synthesis of (+)-13-deoxytedanolide. Proc Natl Acad Sci U S A 2004; 101:12042-7. [PMID: 15163795 PMCID: PMC514431 DOI: 10.1073/pnas.0402084101] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A unified approach for the construction of the potent marine antitumor agents (+)-tedanolide (1) and (+)-13-deoxytedanolide (2) is described. Highlights of the synthetic strategy include the development of a versatile bifunctional dithiane-vinyl iodide linchpin, the unorthodox use of the Evans-Tishchenko reaction, and a late-stage high-risk stereocontrolled introduction of the C(18,19) epoxide to achieve a total synthesis of (+)-13-deoxytedanolide (2).
Collapse
Affiliation(s)
- Amos B Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, USA.
| | | | | | | |
Collapse
|