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Lumbroso A, Beaudet I, Quintard J, Fraisse C, Galland N, Toupet L, Le Grognec E. Sn−Li Transmetalation of α‐Aminoorganostannanes for the Stereoselective Synthesis of Substituted Dehydropiperidines and Dehydroazepanes. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900349] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Isabelle Beaudet
- Université de Nantes, CNRS, CEISAM, UMR 6230 F-44000 Nantes France
| | | | - Cécile Fraisse
- Université de Nantes, CNRS, CEISAM, UMR 6230 F-44000 Nantes France
| | - Nicolas Galland
- Université de Nantes, CNRS, CEISAM, UMR 6230 F-44000 Nantes France
| | - Loïc Toupet
- Université de Rennes 1, CNRS UMR 6251Institut de Physique de Rennes Campus de Beaulieu 35042 Rennes France
| | - Erwan Le Grognec
- Université de Nantes, CNRS, CEISAM, UMR 6230 F-44000 Nantes France
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2
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Liu S, Gray D, Zhu L, Girolami GS. Lithium–Olefin π-Complexes and the Mechanism of Carbolithiation: Synthesis, Solution Behavior, and Crystal Structure of (2,2-Dimethylpent-4-en-1-yl)lithium. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00169] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sumeng Liu
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Danielle Gray
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Lingyang Zhu
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Gregory S. Girolami
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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3
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Vyas Devambatla RK, Velagaleti R, Yarravarapu N, Fleming FF. SNi′ displacements with main group organometallics. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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4
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Gao G, Gu FL, Jiang JX, Jiang K, Sheng CQ, Lai GQ, Xu LW. Neighboring Lithium-Assisted [1,2]-Wittig Rearrangement: Practical Access to Diarylmethanol-Based 1,4-Diols and Optically Active BINOL Derivatives with Axial and sp3-Central Chirality. Chemistry 2011; 17:2698-703. [DOI: 10.1002/chem.201003111] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Indexed: 11/08/2022]
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5
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La Cruz TE, Rychnovsky SD. Stereoselectivity of intramolecular SN' cyclizations of alkyllithium reagents on methoxy alkenes. J Org Chem 2006; 71:1068-73. [PMID: 16438522 PMCID: PMC2496923 DOI: 10.1021/jo052166u] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The cyclization of alkyllithium reagents onto methoxy alkenes has been investigated. The alkyllithium reagent was generated by reductive lithiation of an alkyl nitrile. In an unbiased substrate, a methoxy leaving group attached to a stereogenic secondary carbon atom led to the cyclization product with high optical purity. The configuration of the product demonstrated that the cyclization had proceeded with high syn-S(N)' selectivity. Previously we have shown that 2-lithiotetrahydropyran reagents cyclize to form spirocycles with the alkene cis to the pyran oxygen. Substrates were prepared to evaluate the importance of the configuration of the secondary allyl methyl ether against the alpha-alkoxy alkyllithium configuration. In the matched case (cyano acetal 38), a very selective cyclization ensued. In the mismatched case (cyano acetal 39), the spiro ether selectivity dominated. The syn-S(N)' selectivity overcame the normal E selectivity in the cyclization and accounted for the major product, Z-alkene 45. Thus the stereochemical preference in these alkyllithium cyclizations is dominated by the spiroether effect, followed by the syn-S(N)' selectivity and finally the preference for E-alkene formation.
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8
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Christoph G, Hoppe D. Asymmetric synthesis of 2-alkenyl-1-cyclopentanols via tin-lithium exchange and intramolecular cycloalkylation. Org Lett 2002; 4:2189-92. [PMID: 12074664 DOI: 10.1021/ol026068w] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] We report a method for the synthesis of chiral cyclopentanes using tin-lithium exchange and cycloalkylation reactions. The sec-butyllithium/(-)-sparteine-mediated deprotonation of an alkyl carbamate and subsequent substitution furnishes a highly enantioenriched stannane as a stable carbanion equivalent. It was transformed into suitable cyclization precursors, which underwent tin-lithium exchange and stereoselective cycloalkylation when reacted with n-butyllithium, giving highly enantioenriched cyclopentanes in very good yields. A kinetic resolution was observed with a higher substituted stannane.
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Affiliation(s)
- Guido Christoph
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
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9
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Mealy MJ, Bailey WF. Synthesis of heterocycles by cyclization of unsaturated organolithiums: a review. J Organomet Chem 2002. [DOI: 10.1016/s0022-328x(01)01244-x] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Abstract
Enantiomerically enriched alpha-amino-organolithium species, in which the lithium atom is attached to a stereogenic carbon centre, have been found to be chemically stable at room temperature in a solvent of very low polarity and undergo intramolecular carbolithiation onto an unactivated alkene. The configurational stability of the chiral organolithium species, bearing a variety of N-alkenyl substituents, was probed by studying the enantiomeric purity of the cyclization products. With N-but-3-enyl-2-lithiopyrrolidine, cyclization to the five-membered ring is more rapid than racemization and a high yield of the pyrrolizidine alkaloid (+)-pseudoheliotridane was obtained with no loss of optical purity. In contrast, with N-pent-4-enyl-2-lithiopyrrolidine, cyclization to the six-membered ring was found to occur with significant loss of optical purity. The cyclization to the six-membered ring was determined to occur with a half-life, t(1/2) approximately 90 min at 23 degrees C. The epimerization of this organolithium species in hexane/Et2O 4:1 was calculated to have a half-life, t(1/2) approximately 30 min at 23 degrees C. Enhanced levels of enantioselectivity for the formation of the indolizidine ring system were obtained using an alkene bearing a terminal phenylthio substituent. With N-[(3-phenylthio)-prop-2-enyl]-2-lithiopyrrolidine, cyclization to the four-membered ring occurs with poor enantioselectivity at low temperature in THF but is highly enantioselective at room temperature in a solvent of very low polarity.
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11
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Regio- and Stereoselective Addition Reactions of Organolithiums. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1460-1567(02)80038-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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12
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Laqua H, Fröhlich R, Wibbeling B, Hoppe D. Synthesis of enantioenriched indene-derived bicyclic alcohols and tricyclic cyclopropanes via (−)-sparteine-mediated lithiation of a racemic precursor and kinetic resolution during the cyclocarbolithiation. J Organomet Chem 2001. [DOI: 10.1016/s0022-328x(00)00832-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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13
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Rychnovsky SD, Hata T, Kim AI, Buckmelter AJ. Use of a conformational radical clock for evaluating alkyllithium-mediated cyclization reactions. Org Lett 2001; 3:807-10. [PMID: 11263887 DOI: 10.1021/ol006866r] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reductive lithiation of nitrile 9 led to the cyclic product 11 as a single diastereomer in 42% ee. The intermediate radical is a conformational radical clock. The radical lifetime can be determined from the optical purity of the product 11. We show that the lifetime of the intermediate radical is too brief to allow a radical cyclization, and thus the cyclization proceeds through an alkyllithium intermediate.
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Affiliation(s)
- S D Rychnovsky
- Department of Chemistry, 516 Rowland Hall, University of California, Irvine, California 92697-2025, USA.
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Bailey WF, Mealy MJ. Asymmetric Cyclization of Achiral Olefinic Organolithiums Controlled by a Stereogenic Lithium: Intramolecular Carbolithiation in the Presence of (−)-Sparteine. J Am Chem Soc 2000. [DOI: 10.1021/ja000471l] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- William F. Bailey
- Department of Chemistry, The University of Connecticut Storrs, Connecticut 06269-3060
| | - Michael J. Mealy
- Department of Chemistry, The University of Connecticut Storrs, Connecticut 06269-3060
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15
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Abstract
Tin-lithium exchange and intramolecular carbolithiation (anionic cyclization) have been used to construct the three nitrogen-positional isomers of the azabicyclo[2.2.1]heptane ring system. The 7-azabicyclo[2.2.1]heptane ring system is accessed from either diastereomer of a 2,5-disubstituted pyrrolidine, via a chiral organolithium intermediate. The 2-azabicyclo[2.2.1]heptane ring system is formed stereoselectively in low yield by a tandem cyclization, together with the product from monocyclization. Better yields of the 2-aza ring system can be obtained using an alternative approach from a 2-tributylstannyl-4-allylpyrrolidine, despite the trans arrangement of the tin (and, hence, lithium) atom and the allyl unit. The 1-azabicyclo[2.2.1]heptane ring system is accessed in just three steps from 4-piperidone.
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Tomooka K, Inoue T, Nakai T. Stereochemistry and Mechanism of Vinyl-migrating [1,2]-Wittig Rearrangement ofα-Lithioalkyl Vinyl Ethers. CHEM LETT 2000. [DOI: 10.1246/cl.2000.418] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Tomooka K, Komine N, Nakai T. Modified Cyclization of Enantio-enriched a-Homoallyloxyalkyllithiums Generated by Sn-Li Transmetallation: Effects of Additives and Structural Requirement. HETEROCYCLES 2000. [DOI: 10.3987/com-99-s135] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Oestreich M, Hoppe D. (−)-Sparteine-mediated stereoselective intramolecular conjugate addition reactions of dienes and enynes. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00092-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Tomooka K, Komine N, Sasaki T, Shimizu H, Nakai T. Enantioselective carbanion cyclization of 5-alkenyl carbamates induced by asymmetric lithiation with s-butyllithium/(−)-sparteine system. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)02233-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Amano S, Fujiwara K, Murai A. The Substituent Effect on Stereoselective Reductive Lithiation of 4,5-Disubstituted 2-Phenylthiooxolane. CHEM LETT 1998. [DOI: 10.1246/cl.1998.409] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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