1
|
Martinez ST, Belouezzane C, Pinto AC, Glasnov T. Synthetic Strategies towards the Azabicyclo[3.3.0]-Octane Core of Natural Pyrrolizidine Alkaloids. An Overview. ORG PREP PROCED INT 2016. [DOI: 10.1080/00304948.2016.1165058] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
2
|
Lhermet R, Ahmad M, Hauduc C, Fressigné C, Durandetti M, Maddaluno J. Intramolecular Carbolithiation of Heterosubstituted Alkynes: An Experimental and Theoretical Study. Chemistry 2015; 21:8105-11. [DOI: 10.1002/chem.201500201] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Indexed: 11/09/2022]
|
3
|
Cobalt-catalyzed arylation and alkenylation of alpha-bromo eneformamides and enecarbamates by cross-coupling with organic bromides: Application to the synthesis of functionalized piperidines and azepanes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
4
|
Beng TK, Fox N, Bassler DP, Alwali A, Sincavage K, Silaire AWV. Trapping of carbolithiation-derived tertiary benzylic α-lithio piperidines with carbon electrophiles: Controlling the formation of α-amino quaternary and vicinal stereocenters. Org Biomol Chem 2015. [DOI: 10.1039/c5ob01371b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interception of carbolithiation-derived tertiary benzylic α-lithio piperidines with carbon electrophiles has led to the diastereoselective synthesis of vicinally functionalized piperidines bearing α-amino quaternary stereocenters.
Collapse
Affiliation(s)
| | - Nathan Fox
- Department of Chemistry
- Susquehanna University
- Selinsgrove
- USA
| | | | - Amir Alwali
- Department of Chemistry
- Susquehanna University
- Selinsgrove
- USA
| | | | | |
Collapse
|
5
|
Beng TK, Sincavage K, Silaire AWV, Alwali A, Bassler DP, Spence LE, Beale O. Direct access to functionalized benzotropones, azepanes, and piperidines by reductive cross-coupling of α-bromo enones with α-bromo enamides. Org Biomol Chem 2015; 13:5349-53. [DOI: 10.1039/c5ob00517e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
High-yielding syntheses of functionalized azepenes and piperidines, bearing an α-benzotropone derivative, have been achieved through cobalt-catalysed reductive cross-coupling of α-bromo enamides with α-bromo enones.
Collapse
Affiliation(s)
| | | | | | - Amir Alwali
- Department of Chemistry
- Susquehanna University
- Selinsgrove
- USA
| | | | | | - Oliver Beale
- Department of Chemistry
- Susquehanna University
- Selinsgrove
- USA
| |
Collapse
|
6
|
Reddy AR, Zhou CY, Guo Z, Wei J, Che CM. Ruthenium-porphyrin-catalyzed diastereoselective intramolecular alkyl carbene insertion into C-H bonds of alkyl diazomethanes generated in situ from N-tosylhydrazones. Angew Chem Int Ed Engl 2014; 53:14175-80. [PMID: 25319195 DOI: 10.1002/anie.201408102] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Indexed: 11/08/2022]
Abstract
With a ruthenium-porphyrin catalyst, alkyl diazomethanes generated in situ from N-tosylhydrazones efficiently underwent intramolecular C(sp(3))-H insertion of an alkyl carbene to give substituted tetrahydrofurans and pyrrolidines in up to 99% yield and with up to 99:1 cis selectivity. The reaction displays good tolerance of many functionalities, and the procedure is simple without the need for slow addition with a syringe pump. From a synthetic point of view, the C-H insertion of N-tosylhydrazones can be viewed as reductive coupling between a C=O bond and a C-H bond to form a new C-C bond, since N-tosylhydrazones can be readily prepared from carbonyl compounds. This reaction was successfully applied in a concise synthesis of (±)-pseudoheliotridane.
Collapse
Affiliation(s)
- Annapureddy Rajasekar Reddy
- HKU Shenzhen Institute of Research and Innovation, Shenzhen (China); State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Hong Kong (China)
| | | | | | | | | |
Collapse
|
7
|
Reddy AR, Zhou CY, Guo Z, Wei J, Che CM. Ruthenium-Porphyrin-Catalyzed Diastereoselective Intramolecular Alkyl Carbene Insertion into CH Bonds of Alkyl Diazomethanes Generated In Situ fromN-Tosylhydrazones. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408102] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
8
|
Gómez-Sanjuan A, Sotomayor N, Lete E. Inter- and intramolecular enantioselective carbolithiation reactions. Beilstein J Org Chem 2013; 9:313-22. [PMID: 23504613 PMCID: PMC3596099 DOI: 10.3762/bjoc.9.36] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 01/23/2013] [Indexed: 11/23/2022] Open
Abstract
In this review we summarize recent developments in inter- and intramolecular enantioselective carbolithiation reactions carried out in the presence of a chiral ligand for lithium, such as (-)-sparteine, to promote facial selection on a C=C bond. This is an attractive approach for the construction of new carbon-carbon bonds in an asymmetric fashion, with the possibility of introducing further functionalization on the molecule by trapping the reactive organolithium intermediates with electrophiles.
Collapse
Affiliation(s)
- Asier Gómez-Sanjuan
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco / Euskal Herriko Unibertsitatea UPV/EHU, Apdo. 644, 48080 Bilbao, Spain
| | | | | |
Collapse
|
9
|
García-Calvo O, Coya E, Lage S, Coldham I, Sotomayor N, Lete E. Intramolecular Carbolithiation Reactions in the Construction of Medium-Sized Rings. Synthesis of Pyrroloisoquinolines, Benzazepines, and Benzazocines. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200994] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
10
|
Girard AL, Lhermet R, Fressigné C, Durandetti M, Maddaluno J. Influence of the Acetylenic Substituent on the Intramolecular Carbolithiation of Alkynes. European J Org Chem 2012. [DOI: 10.1002/ejoc.201101777] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
11
|
Gessner VH, Koller SG, Strohmann C, Hogan AM, O'Shea DF. Mechanistic insight into stereoselective carbolithiation. Chemistry 2011; 17:2996-3004. [PMID: 21294193 DOI: 10.1002/chem.201000814] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Revised: 10/05/2010] [Indexed: 11/07/2022]
Abstract
This article addresses the mechanistic features of asymmetric carbolithiation of β-methylstyrenes. While often the presence of functional groups is required to obtain high enantioselectivities in carbolithiation reactions, simple β-methylstyrene also gives high selectivities in (-)-sparteine-mediated addition of alkyl lithium compounds. Computational studies on the carbolithiation of β-methylstyrene with (-)-sparteine show that the observed selectivities are the result of repulsion effects in the diastereomeric transition states between the (-)-sparteine⋅alkyl lithium adduct and the β-methylstyrene, upon approximation of the two reactants. In contrast, for the ortho-amino β-methylstyrene (E)-benzyl(2-propenylphenyl)amine (4) X-ray structure analyses of intermediate lithium amides indicate a carbolithiation mechanism in which one side of the double bond is shielded by the amide moiety, leaving only one side free for approach of the chiral alkyl lithium adduct.
Collapse
Affiliation(s)
- Viktoria H Gessner
- Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
| | | | | | | | | |
Collapse
|
12
|
Coldham I, Adams H, Ashweek NJ, Barker TA, Reeder AT, Skilbeck MC. Synthesis of 2-hydroxy-3-indolinones and 3-hydroxy-2-indolinones by anionic cyclization, in situ oxidation and rearrangement. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.159] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
13
|
Martínez-Estíbalez U, Sotomayor N, Lete E. Intramolecular Carbolithiation Reactions for the Synthesis of 2,4-Disubstituted Tetrahydro-quinolines: Evaluation of TMEDA and (−)-Sparteine as Ligands in the Stereoselectivity † Dedicated to Prof. Josep Font on the occasion of his 70th birthday. Org Lett 2009; 11:1237-40. [DOI: 10.1021/ol900066c] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Unai Martínez-Estíbalez
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Apdo. 644. 48080 Bilbao, Spain
| | - Nuria Sotomayor
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Apdo. 644. 48080 Bilbao, Spain
| | - Esther Lete
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Apdo. 644. 48080 Bilbao, Spain
| |
Collapse
|
14
|
Bahde RJ, Rychnovsky SD. Cyclization via carbolithiation of alpha-amino alkyllithium reagents. Org Lett 2008; 10:4017-20. [PMID: 18700774 DOI: 10.1021/ol801523r] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report a new route to tertiary alpha-amino stereocenters by sequential alkylation of alpha-amino nitriles followed by reductive lithiation of the nitrile and cyclization onto an alkene. Reductive lithiation of alpha-amino nitriles using lithium 4,4'-di-tert-butylbiphenylide (LiDBB) and subsequent intramolecular carbolithiation proceeded with modest to high diastereoselectivity to deliver cyclic or spirocyclic ring systems. The stereoselectivity of these intramolecular carbolithiations was examined using density function calculations to evaluate plausible transition state models.
Collapse
Affiliation(s)
- Robert J Bahde
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025, USA
| | | |
Collapse
|
15
|
Hogan AML, O’Shea DF. Synthetic applications of carbolithiation transformations. Chem Commun (Camb) 2008:3839-51. [DOI: 10.1039/b805595e] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Sivaprakasam M, Couty F, David O, Marrot J, Sridhar R, Srinivas B, Rama Rao K. A Straightforward Synthesis of Enantiopure Bicyclic Azetidines. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700616] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
17
|
Melero C, Guijarro A, Baumann V, Pérez-Jiménez ÁJ, Yus M. Carbolithiation of Simple Terminal and Strained Internal Alkenes by the Naphthalene and the Biphenyl Dianion: New Modes of Reactivity of Highly Reduced Organic Species in Solution. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700447] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
18
|
Sanz R, Ignacio JM, Rodríguez MA, Fañanás FJ, Barluenga J. Intramolecular Carbolithiation of 2,6-Dilithio-1,6-heptadienes: An Experimental and Theoretical Study. Chemistry 2007; 13:4998-5008. [PMID: 17372993 DOI: 10.1002/chem.200601863] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
2,6-Dilithio-1,6-heptadienes 3 undergo intramolecular carbolithiation in Et(2)O/N,N,N',N'-tetramethylethylenediamine (TMEDA) at the lithiated double bonds to afford 1,2-bis(lithiomethyl)cyclopentenes 5. Reaction of these dianions with electrophiles affords a number of 1,2-difunctionalized cyclopentene derivatives 7-10. The ease of carbolithiation of 2,6-dilithio-1,6-heptadiene (3a) compared to that of 2-lithio-1,6-heptadiene (14) has been studied experimentally. A series of ab initio molecular-orbital calculations on the course of the reaction were carried out and the results were compared to those for the corresponding intramolecular carbolithiation of an isolated double bond. The Li-C interactions found in the transition state by this theoretical study support a carbolithiation pathway for the cyclization of 2,6-dilithio-1,6-heptadienes.
Collapse
Affiliation(s)
- Roberto Sanz
- Departamento de Química, Area de Química Orgánica, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001-Burgos, Spain
| | | | | | | | | |
Collapse
|
19
|
Ortiz FL, Iglesias MJ, Fernandez I, Sanchez CMA, Gómez GR. Nucleophilic Dearomatizing (DNAr) Reactions of Aromatic C,H-Systems. A Mature Paradigm in Organic Synthesis. Chem Rev 2007; 107:1580-691. [PMID: 17488057 DOI: 10.1021/cr030207l] [Citation(s) in RCA: 266] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fernando López Ortiz
- Area de Química Orgánica, Universidad de Almería, Carretera de Sacramento s/n, 04120 Almería, Spain.
| | | | | | | | | |
Collapse
|
20
|
Christoph G, Stratmann C, Coldham I, Hoppe D. Asymmetric Synthesis of 3-Hydroxy-pyrrolidines via Tin−Lithium Exchange and Cyclization. Org Lett 2006; 8:4469-71. [PMID: 16986927 DOI: 10.1021/ol061615p] [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: 11/28/2022]
Abstract
We report a method for the synthesis of chiral pyrrolidines using tin-lithium exchange and cyclization reactions. The precursors are formed readily from simple starting materials and undergo tin-lithium exchange by treatment with n-butyllithium. Subsequent intramolecular carbolithiation is stereoselective to give highly enantiomerically enriched pyrrolidines in excellent yields.
Collapse
Affiliation(s)
- Guido Christoph
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | | | | | | |
Collapse
|
21
|
Stereochemistry of the cyclization of alkoxy-substituted 5-hexenyllithiums: effect of solvent and lithium iodide on diastereoselectivity. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.01.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
22
|
|
23
|
|
24
|
Coldham I, Dufour S, Haxell TF, Vennall GP. Dynamic resolution of N-alkyl-2-lithiopyrrolidines with the chiral ligand (−)-sparteine. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.01.096] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
25
|
Ashweek NJ, Brandt P, Coldham I, Dufour S, Gawley RE, Haeffner F, Klein R, Sanchez-Jimenez G. Barrier to Enantiomerization of Unstabilized, Chelated, and Dipole-Stabilized 2-Lithiopyrrolidines. J Am Chem Soc 2004; 127:449-57. [PMID: 15631496 DOI: 10.1021/ja048090l] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Kinetics experiments have been used to establish the free energy, enthalpy, and entropy of activation for the enantiomerization of three structural classes of 2-lithiopyrrolidines. We find that alpha-aminoorganolithiums chelated by a N-methoxyethyl or N-Boc group have a barrier to enantiomerization (DeltaG++) 2-3 kcal/mol lower than that of unstabilized alpha-aminoorganolithiums at 273 K. Density functional calculations were performed to clarify possible ground state and transition structures and to identify possible pathways for inversion of these chiral organolithium species.
Collapse
|
26
|
|
27
|
Ramallal AM, López-Ortiz F, González J. Ionic vs Pericyclic Transition States for the Cyclization Reactions of Cα-N Anions Derived from Amides and Phosphinamides. Org Lett 2004; 6:2141-4. [PMID: 15200305 DOI: 10.1021/ol0493204] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[structure: see text] Ab initio and DFT calculations indicate that the anionic cyclization of vinyl- and phenyl-carboxamides and phosphinamides metalated at the C(alpha)-N carbon fits better to a Michael-type ionic addition than to an electrocyclic ring closure. The lithium atom has no influence on the type of reaction mechanism.
Collapse
Affiliation(s)
- Antonio Morán Ramallal
- Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, c/Julián Clavería 8, 33006, Oviedo, Spain
| | | | | |
Collapse
|
28
|
Chinchilla R, Nájera C, Yus M. Metalated Heterocycles and Their Applications in Synthetic Organic Chemistry. Chem Rev 2004; 104:2667-722. [PMID: 15137804 DOI: 10.1021/cr020101a] [Citation(s) in RCA: 272] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rafael Chinchilla
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica, Facultad de Ciencias, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain.
| | | | | |
Collapse
|
29
|
Cintrat JC, Léat V, Parrain JL, Le Grognec E, Beaudet I, Toupet L, Quintard JP. N-Boc-2-stannyloxazolidines Derived from (R)-Phenylgly- cinol: Preparation, Transmetalation, and Use as Precursors of Enantioenriched (α-Aminoalkyl)triorganostannanes. Organometallics 2004. [DOI: 10.1021/om034267t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-Christophe Cintrat
- Laboratoire de Synthèse Organique, UMR-CNRS 6513, Faculté des Sciences et des Techniques de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France and Groupe Matière Condensée et Matériaux, UMR-CNRS 6626, Université de Rennes, Bâtiment A11, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Véronique Léat
- Laboratoire de Synthèse Organique, UMR-CNRS 6513, Faculté des Sciences et des Techniques de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France and Groupe Matière Condensée et Matériaux, UMR-CNRS 6626, Université de Rennes, Bâtiment A11, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Jean-Luc Parrain
- Laboratoire de Synthèse Organique, UMR-CNRS 6513, Faculté des Sciences et des Techniques de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France and Groupe Matière Condensée et Matériaux, UMR-CNRS 6626, Université de Rennes, Bâtiment A11, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Erwan Le Grognec
- Laboratoire de Synthèse Organique, UMR-CNRS 6513, Faculté des Sciences et des Techniques de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France and Groupe Matière Condensée et Matériaux, UMR-CNRS 6626, Université de Rennes, Bâtiment A11, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Isabelle Beaudet
- Laboratoire de Synthèse Organique, UMR-CNRS 6513, Faculté des Sciences et des Techniques de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France and Groupe Matière Condensée et Matériaux, UMR-CNRS 6626, Université de Rennes, Bâtiment A11, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Loïc Toupet
- Laboratoire de Synthèse Organique, UMR-CNRS 6513, Faculté des Sciences et des Techniques de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France and Groupe Matière Condensée et Matériaux, UMR-CNRS 6626, Université de Rennes, Bâtiment A11, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Jean-Paul Quintard
- Laboratoire de Synthèse Organique, UMR-CNRS 6513, Faculté des Sciences et des Techniques de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France and Groupe Matière Condensée et Matériaux, UMR-CNRS 6626, Université de Rennes, Bâtiment A11, Campus de Beaulieu, F-35042 Rennes Cedex, France
| |
Collapse
|
30
|
Gralla G, Wibbeling B, Hoppe D. Synthesis of 2-alkylidene-cycloalkane-1,3-diols via enantioselective intramolecular carbolithiation. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.10.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
31
|
|
32
|
Beak P, Johnson TA, Kim DD, Lim SH. Enantioselective Synthesis by Lithiation Adjacent to Nitrogen and Electrophile Incorporation. TOP ORGANOMETAL CHEM 2003. [DOI: 10.1007/3-540-36117-0_5] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
|
33
|
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.
Collapse
Affiliation(s)
- Guido Christoph
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | | |
Collapse
|
34
|
Yus M, Ortiz R, Huerta FF. DTBB-catalysed lithiation of 6-chloro-1-hexene and related systems: synthetically useful temperature-dependent behaviour. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00415-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|