301
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Cabrera S, Reyes E, Alemán J, Milelli A, Kobbelgaard S, Jørgensen KA. Organocatalytic Asymmetric Synthesis of α,α-Disubstituted α-Amino Acids and Derivatives. J Am Chem Soc 2008; 130:12031-7. [DOI: 10.1021/ja804567h] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Silvia Cabrera
- Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Efraim Reyes
- Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - José Alemán
- Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Andrea Milelli
- Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Sara Kobbelgaard
- Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Karl Anker Jørgensen
- Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
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302
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Wilt JC, Pink M, Johnston JN. A diastereo- and enantioselective synthesis of alpha-substituted anti-alpha,beta-diaminophosphonic acid derivatives. Chem Commun (Camb) 2008:4177-9. [PMID: 18802521 DOI: 10.1039/b808393b] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly diastereo- and enantioselective additions of alpha-nitrophosphonates to imines catalyzed by a chiral Brønsted acid are described.
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Affiliation(s)
- Jeremy C Wilt
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235-1822, USA
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303
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Cavelier F, Marchand D, Martinez J. α,α′-Disubstituted Amino Acids with Silylated Side Chains as Lipophilic Building Blocks for the Synthesis of Peptaibol Analogues. Chem Biodivers 2008; 5:1279-87. [DOI: 10.1002/cbdv.200890114] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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304
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Affiliation(s)
- Keiji Maruoka
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502 Japan
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305
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Tanaka K, Takahashi M, Imase H, Osaka T, Noguchi K, Hirano M. Enantioselective synthesis of α,α-disubstituted α-amino acids by Rh-catalyzed [2+2+2] cycloaddition of 1,6-diynes with protected dehydroamino acid. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.04.107] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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306
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Lumini M, Cordero FM, Pisaneschi F, Brandi A. Straightforward Synthesis of α-Substituted Prolines by Cross-Metathesis. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800044] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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307
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Flores-Ortega A, Jiménez AI, Cativiela C, Nussinov R, Alemán C, Casanovas J. Conformational preferences of alpha-substituted proline analogues. J Org Chem 2008; 73:3418-27. [PMID: 18351745 PMCID: PMC2679371 DOI: 10.1021/jo702710x] [Citation(s) in RCA: 41] [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
DFT calculations at the B3LYP/6-31+G(d,p) level have been used to investigate how the replacement of the alpha hydrogen by a more sterically demanding group affects the conformational preferences of proline. Specifically, the N-acetyl-N'-methylamide derivatives of L-proline, L-alpha-methylproline, and L-alpha-phenylproline have been calculated, with both the cis/trans isomerism of the peptide bonds and the puckering of the pyrrolidine ring being considered. The effects of solvation have been evaluated by using a Self-Consistent Reaction Field model. As expected, tetrasubstitution at the alpha carbon destabilizes the conformers with one or more peptide bonds arranged in cis. The lowest energy minimum has been found to be identical for the three compounds investigated, but important differences are observed regarding other energetically accessible backbone conformations. The results obtained provide evidence that the distinct steric requirements of the substituent at C (alpha) may play a significant role in modulating the conformational preferences of proline.
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Affiliation(s)
- Alejandra Flores-Ortega
- Departament d’Enginyeria Química, E. T. S. d’Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Avda. Diagonal n° 647, 08028 Barcelona, Spain
| | - Ana I. Jiménez
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza – CSIC, 50009 Zaragoza, Spain
| | - Carlos Cativiela
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza – CSIC, 50009 Zaragoza, Spain
| | - Ruth Nussinov
- Basic Research Program, SAIC-Frederick, Inc. Center for Cancer Research Nanobiology Program, NCI, Frederick, MD 21702, USA
- Department of Human Genetics Sackler, Medical School, Tel Aviv University, Tel Aviv 69978, Israel
| | - Carlos Alemán
- Departament d’Enginyeria Química, E. T. S. d’Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Avda. Diagonal n° 647, 08028 Barcelona, Spain
| | - Jordi Casanovas
- Departament de Química, Escola Politècnica Superior, Universitat de Lleida, c/Jaume II n° 69, 25001 Lleida, Spain
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308
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Šimonyiová S, Wanner KT. Electrocyclic ring-opening reactions may cause failure of enolate alkylation of 1,4-oxazin-2-one based chiral glycine equivalents. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.03.059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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309
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Singh A, Johnston JN. A diastereo- and enantioselective synthesis of alpha-substituted syn-alpha,beta-diamino acids. J Am Chem Soc 2008; 130:5866-7. [PMID: 18410096 DOI: 10.1021/ja8011808] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Highly diastereo- and enantioselective additions of substituted alpha-nitroesters to imines have been developed. High diastereoselection relies on the finding that the combination of chiral proton catalyst 2b and alpha-nitro aryl esters bearing 2,6-disubstitution combine to raise substrate-controlled diastereoselection to >20:1 in favor of the syn diastereomer. Furthermore, the chiral catalyst provides enantioselection to the 99% level through control of the addition step in which the azomethine pi-faces are differentiated. The bifunctional chiral protic acid catalyst enables these reactions to proceed without separate preactivation of either substrate, leading to a straightforward synthetic protocol for the formation of alpha,beta-diamino phenyl alanine derivatives.
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Affiliation(s)
- Anand Singh
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235-1822, USA
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310
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Branca M, Gori D, Guillot R, Alezra V, Kouklovsky C. Tertiary Aromatic Amide for Memory of Chirality: Access to Enantioenriched α-Substituted Valine. J Am Chem Soc 2008; 130:5864-5. [DOI: 10.1021/ja801165z] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mathieu Branca
- Laboratoire de Chimie des Procédés et Substances Naturelles, ICMMO, CNRS UMR 8182, Bât 410, Université Paris-Sud, F-91405 Orsay, France
| | - Didier Gori
- Laboratoire de Chimie des Procédés et Substances Naturelles, ICMMO, CNRS UMR 8182, Bât 410, Université Paris-Sud, F-91405 Orsay, France
| | - Régis Guillot
- Laboratoire de Chimie des Procédés et Substances Naturelles, ICMMO, CNRS UMR 8182, Bât 410, Université Paris-Sud, F-91405 Orsay, France
| | - Valérie Alezra
- Laboratoire de Chimie des Procédés et Substances Naturelles, ICMMO, CNRS UMR 8182, Bât 410, Université Paris-Sud, F-91405 Orsay, France
| | - Cyrille Kouklovsky
- Laboratoire de Chimie des Procédés et Substances Naturelles, ICMMO, CNRS UMR 8182, Bât 410, Université Paris-Sud, F-91405 Orsay, France
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311
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Mitani M, Tanaka Y, Sawada A, Misu A, Matsumoto Y. Preparation of α,α-Disubstituted α-Amino Acid Derivatives via Alkyl Addition to α-Oxime Esters with Organozinc Species. European J Org Chem 2008. [DOI: 10.1002/ejoc.200700929] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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312
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Connon S. The Catalytic Asymmetric Strecker Reaction: Ketimines Continue to Join the Fold. Angew Chem Int Ed Engl 2008; 47:1176-8. [DOI: 10.1002/anie.200703879] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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313
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Di Giacomo M, Vinci V, Serra M, Colombo L. New fast and practical method for the enantioselective synthesis of α-vinyl, α-alkyl quaternary α-amino acids. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2007.12.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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314
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Connon S. Die katalytische asymmetrische Strecker-Reaktion: Fortschritte bei Ketiminen. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200703879] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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315
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Berlin JM, Fu GC. Enantioselective nucleophilic catalysis: the synthesis of aza-beta-lactams through [2+2] cycloadditions of ketenes with azo compounds. Angew Chem Int Ed Engl 2008; 47:7048-50. [PMID: 18668500 PMCID: PMC2790040 DOI: 10.1002/anie.200802439] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Gregory C. Fu
- Prof. Dr. G. C. Fu, Dr. J. M. Berlin, Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139 (USA), Fax: (+1) 617-324-3611, E-mail:
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316
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Calaza MI, Cativiela C. Stereoselective Synthesis of Quaternary Proline Analogues. European J Org Chem 2008; 20:3427-3448. [PMID: 19655047 PMCID: PMC2719988 DOI: 10.1002/ejoc.200800225] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2008] [Indexed: 11/06/2022]
Abstract
This review describes available methods for the diastereoselective and asymmetric synthesis of quaternary prolines. The focus is on the preparation of alpha-functionalized prolines with the pyrrolidine moiety not embedded in a polycyclic frame. The diverse synthetic approaches are classified according to the bond which is formed to complete the quaternary skeleton.
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Affiliation(s)
- M. Isabel Calaza
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza–CSIC, 50009 Zaragoza, Spain, Fax: +34 976 761210
| | - Carlos Cativiela
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza–CSIC, 50009 Zaragoza, Spain, Fax: +34 976 761210
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317
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Regioselective electrophilic substitution of 2,3-aziridino-γ-lactones: preliminary studies aimed at the synthesis of α,α-disubstituted α- or β-amino acids. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.10.082] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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318
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Ntaganda R, Milovic T, Tiburcio J, Thadani AN. Direct, facile synthesis of N-acyl-α-amino amides from α-keto esters and ammonia. Chem Commun (Camb) 2008:4052-4. [DOI: 10.1039/b808302a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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319
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Hashimoto T, Maruoka K. Recent Development and Application of Chiral Phase-Transfer Catalysts. Chem Rev 2007; 107:5656-82. [DOI: 10.1021/cr068368n] [Citation(s) in RCA: 652] [Impact Index Per Article: 38.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takuya Hashimoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502 Japan
| | - Keiji Maruoka
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502 Japan
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320
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Chinchilla R, Nájera C, Ortega FJ. Convenient Conditions for the Enantioselective Synthesis of α-Methyl-α-amino Acids with the Use ofCinchonaAmmonium Salts as Phase-Transfer Organocatalysts. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700925] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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321
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Fischer DF, Xin ZQ, Peters R. Asymmetric Formation of Allylic Amines with N-Substituted Quaternary Stereocenters by PdII-Catalyzed Aza-Claisen Rearrangements. Angew Chem Int Ed Engl 2007; 46:7704-7. [PMID: 17722138 DOI: 10.1002/anie.200702086] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Daniel F Fischer
- Laboratory of Organic Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, Hönggerberg HCI E 111, 8093 Zürich, Switzerland
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322
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Fischer D, Xin ZQ, Peters R. Asymmetrische Synthese von Allylaminen mit N-substituierten quartären Stereozentren durch Palladium(II)-katalysierte Aza-Claisen-Umlagerungen. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200702086] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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323
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Tanaka M, Demizu Y, Nagano M, Hama M, Yoshida Y, Kurihara M, Suemune H. Lipase-Catalyzed Kinetic Resolution of Cyclic trans-1,2-Diols Bearing a Diester Moiety: Synthetic Application to Chiral Seven-Membered-Ring α,α-Disubstituted α-Amino Acid. J Org Chem 2007; 72:7750-6. [PMID: 17713957 DOI: 10.1021/jo701317d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Chiral cycloalkane-trans-1,2-diols (+/-)-3 and (+/-)-8 having a diester moiety have been prepared from dimethyl dialkenylmalonate using olefin metathesis by Grubbs catalyst, followed by epoxidation and acidic hydrolysis. Kinetic resolution of racemic cyclopentane-trans-1,2-diol (+/-)-3 by lipase-catalyzed transesterification afforded an optically active monoacetate (-)-5 of 95% ee in 46% yield and the recovered diol (-)-3 of 92% ee in 51% yield, and that of cycloheptane-trans-1,2-diol (+/-)-8 gave a monoacetate (+)-10 of 95% ee in 51% yield and the diol (-)-8 of >99% ee in 43% yield, respectively. The enantiomer selectivity of racemic cyclic trans-1,2-diols bearing a diester moiety by lipases (Amano PS and Amano AK) was opposite to that of the reported simple racemic cycloalkane-trans-1,2-diols. To explain the lipase-catalyzed enantiomer selectivity, computer modeling of lipase-substrate complexes was performed. Furthermore, the optically active diester (-)-8 could be efficiently converted into an optically active seven-membered-ring alpha,alpha-disubstituted amino acid (4R,5R)-(-)-15.
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Affiliation(s)
- Masakazu Tanaka
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo 158-8501, Japan.
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324
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Jiménez-Osés G, Aydillo C, Busto JH, Zurbano MM, Peregrina JM, Avenoza A. Role of the Countercation in Diastereoselective Alkylations of Pyramidalized Bicyclic Serine Enolates. An Easy Approach to α-Benzylserine. J Org Chem 2007; 72:5399-402. [PMID: 17555358 DOI: 10.1021/jo070656b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The use of a chiral serine equivalent as an excellent chiral building block has been demonstrated in the synthesis of alpha-benzylserine through a diastereoselective lithium enolate alkylation reaction and subsequent acid hydrolysis. The role of a coordinating countercation (lithium) in the alkylation reaction has been investigated. Theoretical studies have been performed in order to elucidate the stereochemical outcome of the alkylation process, which occurs with total retention of configuration.
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Affiliation(s)
- Gonzalo Jiménez-Osés
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, UA-CSIC, 26006 Logroño, Spain
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325
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Bräse S, Baumann T, Dahmen S, Vogt H. Enantioselective catalytic syntheses of α-branched chiral amines. Chem Commun (Camb) 2007:1881-90. [PMID: 17695218 DOI: 10.1039/b611619a] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Stefan Bräse
- Institut für Organische Chemie, Universität Karlsruhe (TH), Fritz-Haber-Weg 6, D-76131 Karlsruhe, Germany.
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326
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Frisch K, Jørgensen KA. Organocatalytic asymmetric destruction of 1-benzylated Reissert compounds catalysed by quaternary cinchona alkaloids. Org Biomol Chem 2007; 5:2966-74. [PMID: 17728863 DOI: 10.1039/b710494d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enantiomeric enrichment of racemic 1-benzylated Reissert compounds under organocatalytic biphasic conditions is presented. The enrichment is the consequence of an asymmetric destruction of the racemic compounds resulting in the formation of the corresponding 1-benzylated isoquinolines. The highest selectivity has been achieved using quaternary cinchona alkaloids as phase-transfer catalysts. The resolution of a number of racemic 1-benzylated Reissert compounds reveals a significant substrate dependence and a proposal for the mechanism of the reaction is presented.
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Affiliation(s)
- Kim Frisch
- Danish National Research Foundation, Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000, Aarhus C, Denmark
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