1
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E- and Z-trisubstituted macrocyclic alkenes for natural product synthesis and skeletal editing. Nat Chem 2022; 14:640-649. [PMID: 35577918 DOI: 10.1038/s41557-022-00935-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 03/24/2022] [Indexed: 12/24/2022]
Abstract
Many therapeutic agents are macrocyclic trisubstituted alkenes but preparation of these structures is typically inefficient and non-selective. A possible solution would entail catalytic macrocyclic ring-closing metathesis, but these transformations require high catalyst loading, conformationally rigid precursors and are often low yielding and/or non-stereoselective. Here we introduce a ring-closing metathesis strategy for synthesis of trisubstituted macrocyclic olefins in either stereoisomeric form, regardless of the level of entropic assistance. The goal was achieved by addressing several unexpected difficulties, including complications arising from pre-ring-closing metathesis alkene isomerization. The power of the method is highlighted by two examples. The first is the near-complete reversal of substrate-controlled selectivity in the formation of a macrolactam related to an antifungal natural product. The other is a late-stage stereoselective generation of an E-trisubstituted alkene in a 24-membered ring, en route to the cytotoxic natural product dolabelide C.
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2
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Wittmann S, Tiniakos AF, Prunet J. Diastereoselective synthesis of trisubstituted olefins using a silicon-tether ring-closing metathesis strategy. Org Biomol Chem 2020; 18:2297-2306. [PMID: 32159196 DOI: 10.1039/c9ob02563d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The diastereoselective synthesis of trisubstituted olefins with concomitant C-C bond formation is still a difficult challenge, and olefin metathesis reactions for the formation of such alkenes are usually not high yielding or/and diastereoselective. Herein we report an efficient and diastereoselective synthesis of trisubstituted olefins flanked by an allylic alcohol, by a silicon-tether ring-closing metathesis strategy. Both E- and Z-trisubstituted alkenes were synthesised, depending on the method employed to cleave the silicon tether. Furthermore, this methodology features a novel Peterson olefination for the synthesis of allyldimethylsilanes. These versatile intermediates were also converted into the corresponding allylchlorodimethylsilanes, which are not easily accessible in high yields by other methods.
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Affiliation(s)
- Stéphane Wittmann
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK.
| | - Alexander F Tiniakos
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK.
| | - Joëlle Prunet
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK.
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3
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Gonela UM, Yadav JS. Synthesis of chiral propargyl alcohols following the base-induced elimination protocol: application in the total synthesis of natural products. NEW J CHEM 2020. [DOI: 10.1039/c9nj05626b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Synthesis of enantiomerically pure propargyl alcohols is one of the most important tools in organic synthesis and “base-induced elimination of β-alkoxy chlorides” could offer the enantiomerically pure propargyl alcohols.
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Affiliation(s)
- Uma Maheshwar Gonela
- Natural Product Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
| | - Jhillu S. Yadav
- Natural Product Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
- School of Science
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4
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Becerra-Figueroa L, Movilla S, Prunet J, Miscione GP, Gamba-Sánchez D. An intramolecular oxa-Michael reaction on α,β-unsaturated α-amino-δ-hydroxycarboxylic acid esters. Synthesis of functionalized 1,3-dioxanes. Org Biomol Chem 2019; 16:1277-1286. [PMID: 29384169 DOI: 10.1039/c7ob03066e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly diastereoselective intramolecular oxa-Michael reaction on α,β-unsaturated α-amino-δ-hydroxycarboxylic acid esters is presented; 1,3-dioxanes functionalized in positions 2,4 and 6 were obtained in good yields and with excellent selectivities; an experimental and computational study was carried out to understand the reaction course in terms of yields and selectivities. This reaction proceeds under mild reaction conditions using highly electrophilic aldehydes and ketones.
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Affiliation(s)
- L Becerra-Figueroa
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia.
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5
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Tiniakos AF, Wittmann S, Audic A, Prunet J. Novel Synthesis of Trisubstituted Olefins for the Preparation of the C16-C30 Fragment of Dolabelide C. Org Lett 2019; 21:589-592. [PMID: 30589270 DOI: 10.1021/acs.orglett.8b03552] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A silicon-tether ring-closing metathesis strategy is reported for the synthesis of trisubstituted olefins flanked by allylic or homoallylic alcohols, which are difficult to obtain by classical ring-closing or cross-metathesis reactions. In addition, a novel Peterson olefination reaction has been developed for the preparation of the allyldimethylsilane precursors, which are versatile synthetic intermediates. This method was then applied to the synthesis of the C16-C30 fragment of dolabelide C.
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Affiliation(s)
- Alexander F Tiniakos
- WESTCHEM, School of Chemistry , University of Glasgow , Joseph Black Building, University Avenue, Glasgow G12 8QQ , U.K
| | - Stéphane Wittmann
- WESTCHEM, School of Chemistry , University of Glasgow , Joseph Black Building, University Avenue, Glasgow G12 8QQ , U.K
| | - Alexandre Audic
- 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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6
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Becerra-Figueroa L, Tiniakos AF, Prunet J, Gamba-Sánchez D. Water-Compatible Synthesis of 2-Trifluoromethyl-1,3-Dioxanes. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Liliana Becerra-Figueroa
- Laboratory of Organic Synthesis, Bio and Organocatalysis; Chemistry Department; Universidad de los Andes; Cra 1 No. 18A-12 Q:305. 111711 Bogota Colombia
| | - Alexander F. Tiniakos
- WestCHEM, School of Chemistry; University of Glasgow; Joseph Black Building, University Avenue 8QQ Glasgow G12 UK
| | - Joëlle Prunet
- WestCHEM, School of Chemistry; University of Glasgow; Joseph Black Building, University Avenue 8QQ Glasgow G12 UK
| | - Diego Gamba-Sánchez
- Laboratory of Organic Synthesis, Bio and Organocatalysis; Chemistry Department; Universidad de los Andes; Cra 1 No. 18A-12 Q:305. 111711 Bogota Colombia
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7
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Becerra-Figueroa L, Brun E, Mathieson M, Farrugia LJ, Wilson C, Prunet J, Gamba-Sánchez D. Diastereoselective synthesis of trifluoromethylated 1,3-dioxanes by intramolecular oxa-Michael reaction. Org Biomol Chem 2017; 15:301-305. [PMID: 27897299 DOI: 10.1039/c6ob02333a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A highly diastereoselective synthesis of trifluoromethylated 1,3-dioxanes is described. The reaction proceeds by an addition/oxa-Michael sequence and works efficiently under mild reaction conditions, with a good substrate scope and acceptable to good yields.
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Affiliation(s)
- Liliana Becerra-Figueroa
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia.
| | - Elodie Brun
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Michael Mathieson
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Louis J Farrugia
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Claire Wilson
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Joëlle Prunet
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Diego Gamba-Sánchez
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia.
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8
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Zhao G, He M, Li H, Duan S, Yuan Z, Xie X, She X. Domino intramolecular Diels-Alder reactions to construct a 6/6/5/5 fused tetracyclic framework. Chem Commun (Camb) 2015; 51:17321-3. [PMID: 26463746 DOI: 10.1039/c5cc06923h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Domino intramolecular Diels-Alder (IMDA) reactions towards the 6/6/5/5 fused tetracyclic natural products were developed in satisfactory yield and high stereoselectivity. Four rings, six contiguous stereocenters and four C-C bonds were formed in a single operation. 4-epi-Hydromitchellene B was also synthesised efficiently via this strategy.
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Affiliation(s)
- Gaoyuan Zhao
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, 730000, China.
| | - Min He
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, 730000, China.
| | - Huilin Li
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, 730000, China.
| | - Shuangshuang Duan
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, 730000, China.
| | - Ziyun Yuan
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, 730000, China.
| | - Xingang Xie
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, 730000, China.
| | - Xuegong She
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, 730000, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 30071, China
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9
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Braun MG, Vincent A, Boumediene M, Prunet J. Highly demanding cross-metathesis in the synthesis of the C16-C30 fragment of dolabelide C. J Org Chem 2011; 76:4921-9. [PMID: 21534597 DOI: 10.1021/jo200466t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly demanding cross-metathesis (CM) reaction for the formation of the C24-C25 trisubstituted olefin of dolabelide C has been optimized. A difference in reactivity between the E and Z enone isomers in this reaction was uncovered, and the selection of the Z isomer of the starting enone was critical for the success of the cross-metathesis. Application to the synthesis of the C16-C30 fragment of dolabelide C is reported.
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Affiliation(s)
- Marie-Gabrielle Braun
- Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, DCSO, F-91128 Palaiseau, France
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10
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Hanson PR, Chegondi R, Nguyen J, Thomas CD, Waetzig JD, Whitehead A. Total synthesis of dolabelide C: a phosphate-mediated approach. J Org Chem 2011; 76:4358-70. [PMID: 21528846 DOI: 10.1021/jo2003506] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first synthesis of dolabelide C (1), a cytotoxic marine macrolide, is reported utilizing a phosphate tether-mediated approach. Bicyclic phosphates (S,S,S(P))-5 and (R,R,R(P))-5 serve as the central building blocks for the construction of two major 1,3-anti-diol subunits in 1 through selective cleavage pathways, regioselective olefin reduction, and cross-metathesis. Overall, phosphate-mediated processes provided copious amounts of both major subunits allowing for a detailed RCM macrocyclization study to the 24-membered macrolactone 1.
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Affiliation(s)
- Paul R Hanson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States.
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11
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Winter P, Vaxelaire C, Heinz C, Christmann M. Transforming terpene feedstock into polyketide architecture. Chem Commun (Camb) 2011; 47:394-6. [DOI: 10.1039/c0cc02332a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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13
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A two-step synthesis of allylic syn 1,3-diols via an intramolecular oxa-Michael reaction followed by a modified Julia olefination. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.10.139] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Gamba-Sanchez D, Oriez R, Prunet J. Regio- and diastereoselective addition of allylic thioethers to aldehydes. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2008.12.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Aouzal R, Prunet J. Synthesis of functionalized Morita–Baylis–Hillman adducts by a conjugate addition–elimination sequence. Org Biomol Chem 2009; 7:3594-8. [DOI: 10.1039/b907373f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Roche C, Desroy N, Haddad M, Phansavath P, Genet JP. Ruthenium-SYNPHOS-Catalyzed Asymmetric Hydrogenations: an Entry to Highly Stereoselective Synthesis of the C15−C30 Subunit of Dolabelide A. Org Lett 2008; 10:3911-4. [DOI: 10.1021/ol801493w] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christophe Roche
- Laboratoire de Synthèse Sélective Organique et Produits Naturels UMR 7573 CNRS, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 01, France
| | - Nicolas Desroy
- Laboratoire de Synthèse Sélective Organique et Produits Naturels UMR 7573 CNRS, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 01, France
| | - Mansour Haddad
- Laboratoire de Synthèse Sélective Organique et Produits Naturels UMR 7573 CNRS, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 01, France
| | - Phannarath Phansavath
- Laboratoire de Synthèse Sélective Organique et Produits Naturels UMR 7573 CNRS, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 01, France
| | - Jean-Pierre Genet
- Laboratoire de Synthèse Sélective Organique et Produits Naturels UMR 7573 CNRS, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 01, France
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17
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Whitehead A, Waetzig JD, Thomas CD, Hanson PR. A multifaceted phosphate tether: application to the C15-C30 subunit of dolabelides A-D. Org Lett 2008; 10:1421-4. [PMID: 18324822 PMCID: PMC2641022 DOI: 10.1021/ol8001865] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Construction of the C15-C30 subunit of dolabelide utilizing a temporary phosphate tether is described. Two routes are reported that make use of the orthogonal protecting- and leaving-group properties innate to phosphate esters. One route relies on a selective terminal oxidation, while a second utilizes a CM/selective hydrogenation sequence. Both routes depend on a highly regio- and diastereoselective cuprate addition to set the requisite stereochemistry at C22.
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Affiliation(s)
- Alan Whitehead
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA
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18
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Waetzig JD, Hanson PR. A multifaceted phosphate tether: application to the C1-C14 subunit of dolabelides A-D. Org Lett 2007; 10:109-12. [PMID: 18062695 DOI: 10.1021/ol7025944] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A phosphate tether approach to the C1-14 subunit of dolabelide is described. The phosphate tether serves a multifaceted role mediating several processes, including (i) diastereotopic differentiation via RCM, (ii) selective CM by imparting Type III behavior to the exocyclic olefin, (iii) regioselective hydrogenation, and (iv) regioselective Pd(0)-catalyzed reductive opening of the bicyclic phosphate. Overall, this strategy uses orthogonal protecting- and leaving-group properties innate to phosphate esters to rapidly assembly the titled subunit.
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Affiliation(s)
- Joshua D Waetzig
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA
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19
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Rotulo-Sims D, Prunet J. Tandem Conjugate Addition−Elimination for the Diastereoselective Synthesis of 4E-Alkenyl syn-1,3-Diols. Org Lett 2007; 9:4147-50. [PMID: 17880094 DOI: 10.1021/ol701624y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have developed a tandem conjugate addition-elimination sequence for the diastereoselective synthesis of protected allylic syn-1,3-diols, starting from vinyl sulfones. The sulfonyl group was then reduced with sodium amalgam to furnish the E-olefin as the major isomer. This method was applied to the synthesis of a trisubstituted alkene modeling the C21-C25 fragment of Dolabelide C.
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Affiliation(s)
- Delphine Rotulo-Sims
- Laboratoire de Synthèse Organique, UMR CNRS 7652, Ecole Polytechnique, DCSO, F-91128 Palaiseau, France
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20
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Yadav J, Reddy MS, Prasad A. Stereoselective synthesis of polyketide precursors containing an anti-1,3-diol system via a Prins cyclisation and reductive cleavage sequence. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.05.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Yadav J, Reddy MS, Rao PP, Prasad A. Stereoselective synthesis of anti-1,3-diol units via Prins cyclisation: application to the synthesis of (−)-sedamine. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.04.102] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Abstract
The first total synthesis of dolabelide D (or of any of the closely related dolabelides) has been achieved with a longest linear sequence of 17 steps. Key features of the synthesis include an application of the catalytic asymmetric silane alcoholysis, the tandem silylformylation-crotylsilylation, and a Brook-like 1,4-carbon to oxygen silyl migration.
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23
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Abstract
The efficient construction of the C(1)-C(13) segment of dolabelide B is described. A key element of the synthesis entails BITIP catalyzed asymmetric methallylation to establish the C(7) stereocenter, which was then used to direct the stereoselective installation of the C(9) and C(11) centers through Evans reduction and 1,5-anti aldol condensation, respectively.
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Affiliation(s)
- Gary E Keck
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, UT 84112-0850, USA
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24
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Condensation of β-hydroxy sulfones and vinyl sulfones with aldehydes and ketones using phenyllithium as base. CR CHIM 2004. [DOI: 10.1016/j.crci.2004.02.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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25
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Desroy N, Le Roux R, Phansavath P, Chiummiento L, Bonini C, Genêt JP. Stereoselective synthesis of C15C24 and C25C30 fragments of dolabelides. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00110-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Rotulo-Sims D, Prunet J. A new, simple, and selective palladium-catalyzed cleavage of triethylsilyl ethers. Org Lett 2002; 4:4701-4. [PMID: 12489965 DOI: 10.1021/ol0271382] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A simple procedure for the cleavage of triethylsilyl (TES) ethers in the presence of 10 wt % Pd/C in methanol or 95% ethanol is reported. This method allows selective removal of alkyl TES ethers in the presence of aromatic TES ethers or tert-butyldimethylsilyl (TBS) protecting groups.
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Affiliation(s)
- Delphine Rotulo-Sims
- Laboratoire de Synthèse Organique, UMR CNRS 7652, Ecole Polytechnique, DCSO, F-91128 Palaiseau, France
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27
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Grimaud L, Rotulo D, Ros-Perez R, Guitry-Azam L, Prunet J. Synthesis of protected syn 1,3-diols by intramolecular conjugate addition to vinyl sulfones. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01796-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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