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Letort A, Long DL, Prunet J. Study of Cascade Ring-Closing Metathesis Reactions en Route to an Advanced Intermediate of Taxol. J Org Chem 2016; 81:12318-12331. [PMID: 27978745 DOI: 10.1021/acs.joc.6b02264] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly functionalized intermediate in the synthesis of Taxol has been synthesized, which features the tricyclic core and the required oxygen substituents at C1, C2, C7, C10, and C13. The key step, a ring-closing dienyne metathesis (RCDEYM) reaction, has been thoroughly optimized to favor the tricyclic product over the undesired bicyclic product resulting from diene metathesis.
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Affiliation(s)
- Aurélien Letort
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building , University Avenue, Glasgow G12 8QQ, U.K
| | - De-Liang Long
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building , University Avenue, Glasgow G12 8QQ, U.K
| | - Joëlle Prunet
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building , University Avenue, Glasgow G12 8QQ, U.K
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Ma C, Letort A, Aouzal R, Wilkes A, Maiti G, Farrugia LJ, Ricard L, Prunet J. Cascade Metathesis Reactions for the Synthesis of Taxane and Isotaxane Derivatives. Chemistry 2016; 22:6891-8. [PMID: 27062670 PMCID: PMC4982030 DOI: 10.1002/chem.201600592] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Indexed: 12/28/2022]
Abstract
Tricyclic isotaxane and taxane derivatives have been synthesized by a very efficient cascade ring‐closing dienyne metathesis (RCDEYM) reaction, which formed the A and B rings in one operation. When the alkyne is present at C13 (with no neighboring gem‐dimethyl group), the RCEDYM reaction leads to 14,15‐isotaxanes 16 a,b and 18 b with the gem‐dimethyl group on the A ring. If the alkyne is at the C11 position (and thus flanked by a gem‐dimethyl group), RCEDYM reaction only proceeds in the presence of a trisubstituted olefin at C13, which disfavors the competing diene ring‐closing metathesis reaction, to give the tricyclic core of Taxol 44.
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Affiliation(s)
- Cong Ma
- Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, DCSO, 91128, Palaiseau, France
| | - Aurélien Letort
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK
| | - Rémi Aouzal
- Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, DCSO, 91128, Palaiseau, France
| | - Antonia Wilkes
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK
| | - Gourhari Maiti
- Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, DCSO, 91128, Palaiseau, France
| | - Louis J Farrugia
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK
| | - Louis Ricard
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, Ecole Polytechnique, LCM, 91128, Palaiseau, France
| | - Joëlle Prunet
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK.
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Roy S, Spilling CD. An expeditious total synthesis of both diastereoisomeric lipid dihydroxytetrahydrofurans from Notheia anomala. Org Lett 2012; 14:2230-3. [PMID: 22506757 PMCID: PMC3345562 DOI: 10.1021/ol300597u] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Short, high yielding syntheses of both diastereomers of the naturally occurring oxylipids 1 and 2 using a combination of organocatalytic hydroxylation of an aldehyde, alkene cross metathesis, and palladium(0) catalyzed cyclization chemistry (six-step process) are reported. Furthermore, the influence of the catalyst on the cross metathesis reaction of the homoallylic 1,2-diol has been studied in detail.
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Affiliation(s)
- Sudeshna Roy
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri 63121
| | - Christopher D. Spilling
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri 63121
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Affiliation(s)
- Joëlle Prunet
- WestCHEM, Department of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK, Fax: +44‐141‐330‐4888
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Construction of eight-membered carbocycles with trisubstituted double bonds using the ring closing metathesis reaction. Molecules 2010; 15:4242-60. [PMID: 20657438 PMCID: PMC6264272 DOI: 10.3390/molecules15064242] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Revised: 06/07/2010] [Accepted: 06/10/2010] [Indexed: 11/17/2022] Open
Abstract
Medium sized carbocycles are particularly difficult to synthesize. Ring closing metathesis reactions (RCM) have recently been applied to construct eight-membered carbocycles, but trisubstituted double bonds in the eight-membered rings are more difficult to produce using RCM reactions. In this review, model examples and our own results are cited and the importance of the preparation of suitably designed precursors is discussed. Examples of RCM reactions used in the total synthesis of natural products are also outlined.
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