1
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Pollack SR, Dion A. Metal-Free Stereoselective Synthesis of ( E)- and ( Z)-N-Monosubstituted β-Aminoacrylates via Condensation Reactions of Carbamates. J Org Chem 2021; 86:11748-11762. [PMID: 34479408 DOI: 10.1021/acs.joc.1c01212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
N-monosubstituted β-aminoacrylates are building blocks, which have been used in the preparation of amino acids and pharmaceuticals. Two efficient, stereoselective methods of preparation, via acid- or base-promoted condensation reactions of carbamates, are described. The base-promoted reaction is E-selective, while acid catalysis can, through the choice of solvent, selectively form E or Z. The acid-catalyzed E-selective process proceeds through a crystallization obviating the need for chromatographic purification.
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Affiliation(s)
- Scott R Pollack
- Department of Process Research & Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Amélie Dion
- Department of Process Research & Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
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2
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Jung WO, Mai BK, Spinello BJ, Dubey ZJ, Kim SW, Stivala CE, Zbieg JR, Liu P, Krische MJ. Enantioselective Iridium-Catalyzed Allylation of Nitroalkanes: Entry to β-Stereogenic α-Quaternary Primary Amines. J Am Chem Soc 2021; 143:9343-9349. [PMID: 34152145 PMCID: PMC8284932 DOI: 10.1021/jacs.1c05212] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first systematic study of simple nitronate nucleophiles in iridium-catalyzed allylic alkylation is described. Using a tol-BINAP-modified π-allyliridium C,O-benzoate catalyst, α,α-disubstituted nitronates substitute racemic branched alkyl-substituted allylic acetates, thus providing entry to β-stereogenic α-quaternary primary amines. DFT calculations reveal early transition states that render the reaction less sensitive to steric effects and distinct trans-effects of diastereomeric chiral-at-iridium π-allyl complexes that facilitate formation of congested tertiary-quaternary C-C bonds.
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Affiliation(s)
- Woo-Ok Jung
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Binh Khanh Mai
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Brian J Spinello
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Zachary J Dubey
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Seung Wook Kim
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Craig E Stivala
- Discovery Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jason R Zbieg
- Discovery Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Michael J Krische
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
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3
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Zhang J, Liu C, Wang X, Chen J, Zhang Z, Zhang W. Rhodium-catalyzed asymmetric hydrogenation of β-branched enamides for the synthesis of β-stereogenic amines. Chem Commun (Camb) 2018; 54:6024-6027. [DOI: 10.1039/c8cc02798f] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
β-Branched simple enamides were hydrogenated to give β-stereogenic amines in quantitative yields and with excellent enantioselectivities.
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Affiliation(s)
- Jian Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs
- School of Pharmacy
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
| | - Chong Liu
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
| | - Xingguang Wang
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
| | - Jianzhong Chen
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
| | - Zhenfeng Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs
- School of Pharmacy
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs
- School of Pharmacy
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
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4
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Pollack SR, Kuethe JT. Chemoselective Reduction of α-Cyano Carbonyl Compounds: Application to the Preparation of Heterocycles. Org Lett 2016; 18:6388-6391. [DOI: 10.1021/acs.orglett.6b03285] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Scott R. Pollack
- Department of Process Research & Development, Merck & Co., Inc., MRL, Rahway, New Jersey 07065, United States
| | - Jeffrey T. Kuethe
- Department of Process Research & Development, Merck & Co., Inc., MRL, Rahway, New Jersey 07065, United States
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5
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Campello HR, Parker J, Perry M, Ryberg P, Gallagher T. Asymmetric Reduction of Lactam-Based β-Aminoacrylates. Synthesis of Heterocyclic β2-Amino Acids. Org Lett 2016; 18:4124-7. [DOI: 10.1021/acs.orglett.6b02074] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
| | - Jeremy Parker
- AstraZeneca, Pharmaceutical Development, Silk Road Business Park, Macclesfield SK10 2NA U.K
| | - Matthew Perry
- AstraZeneca, Innovative Medicines, R&I Chemistry, AstraZeneca R&D Mölndal, Peparedsleden, SE-431 83 Mölndal, Sweden
| | - Per Ryberg
- AstraZeneca, PR&D Södertälje, S-151 85 Södertälje, Sweden
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6
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Kiss L, Cherepanova M, Fülöp F. Recent advances in the stereoselective syntheses of acyclic disubstituted β2,3-amino acids. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.060] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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7
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Remarchuk T, Babu S, Stults J, Zanotti-Gerosa A, Roseblade S, Yang S, Huang P, Sha C, Wang Y. An Efficient Catalytic Asymmetric Synthesis of a β2-Amino Acid on Multikilogram Scale. Org Process Res Dev 2013. [DOI: 10.1021/op4002966] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Travis Remarchuk
- Small
Molecule Process Chemistry, Genentech Inc., A member of the Roche Group, 1 DNA
Way, South San Francisco, California 94080
| | - Srinivasan Babu
- Small
Molecule Process Chemistry, Genentech Inc., A member of the Roche Group, 1 DNA
Way, South San Francisco, California 94080
| | - Jeffrey Stults
- Small
Molecule Process Chemistry, Genentech Inc., A member of the Roche Group, 1 DNA
Way, South San Francisco, California 94080
| | - Antonio Zanotti-Gerosa
- Catalysis
and Chiral Technologies, Johnson Matthey, Unit 28, Cambridge Science Park, Cambridge CB4 0FP, United Kingdom
| | - Stephen Roseblade
- Catalysis
and Chiral Technologies, Johnson Matthey, Unit 28, Cambridge Science Park, Cambridge CB4 0FP, United Kingdom
| | - Shaohui Yang
- WuXi AppTec Co., Ltd., No.
1 Building, #288 FuTe ZhongLu, WaiGaoQiao
Free Trade Zone, Shanghai 200131, P.R. China
| | - Ping Huang
- WuXi AppTec Co., Ltd., No.
1 Building, #288 FuTe ZhongLu, WaiGaoQiao
Free Trade Zone, Shanghai 200131, P.R. China
| | - Chunbo Sha
- WuXi AppTec Co., Ltd., No.
1 Building, #288 FuTe ZhongLu, WaiGaoQiao
Free Trade Zone, Shanghai 200131, P.R. China
| | - Youchu Wang
- WuXi AppTec Co., Ltd., No.
1 Building, #288 FuTe ZhongLu, WaiGaoQiao
Free Trade Zone, Shanghai 200131, P.R. China
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8
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Li L, Chen B, Ke Y, Li Q, Zhuang Y, Duan K, Huang Y, Pang J, Qiu L. Highly efficient synthesis of heterocyclic and alicyclic β2-amino acid derivatives by catalytic asymmetric hydrogenation. Chem Asian J 2013; 8:2167-74. [PMID: 23776190 DOI: 10.1002/asia.201300339] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Indexed: 11/10/2022]
Abstract
A valuable class of new heterocyclic and alicyclic prochiral α-aminomethylacrylates has been conveniently synthesized through a three-step transformation involving a Baylis-Hillman reaction, O-acetylation, and a subsequent allylic amination. The corresponding novel β(2)-amino acid derivatives were prepared with excellent enantioselectivities and high yields by catalytic asymmetric hydrogenation using the catalyst rhodium(Et-Duphos) (Et-Duphos = 2',5',2'',5''-tetraethyl-1,2-bis(phospholanyl)benzene)) under mild reaction conditions (up to 99 % ee and S/C = 1000). The influence of the substrate on the enantioselectivity and reactivity is investigated, and the most suitable substrate configuration for the highly efficient enantioselective hydrogenation of β-substituted α-aminomethylacrylates under the Rh-Duphos system is reported. The current protocol provides a very practical, facile, and scalable method for the preparation of heterocyclic and alicyclic β(2)-amino acids and their derivatives.
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Affiliation(s)
- Lanning Li
- School of Chemistry and Chemical Engineering, Guangdong Engineering Research Center of Chiral Drugs, Sun Yat-sen University, No. 135 Xingangxi Road, Guangzhou 510275, People's Republic of China
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9
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Lühr S, Holz J, Zayas O, Seidelmann O, Domke L, Börner A. Synthesis of enantiopure β2-homoalanine derivatives via rhodium catalyzed asymmetric hydrogenation. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.02.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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11
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Harrad MA, Boualy B, Ali MA, Firdoussi LE, Rizzoli C. rac-Ethyl (2Z)-3-{2-[(Z)-4-eth-oxy-4-oxobut-2-en-2-yl-amino]-cyclo-hexyl-amino}-but-2-enoate. Acta Crystallogr Sect E Struct Rep Online 2011; 67:o1269-o1270. [PMID: 21754555 PMCID: PMC3089325 DOI: 10.1107/s1600536811015248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 04/22/2011] [Indexed: 05/31/2023]
Abstract
The asymmetric unit of the title compound, C(18)H(30)N(2)O(4), contains two independent mol-ecules. In each mol-ecule, the cyclo-hexane ring adopts a chair conformation with equatorial orientation of the substituents, and the conformation is stabilized by two intra-molecular N-H⋯O hydrogen bonds, forming rings of S(6) graph-set motif. One eth-oxy group and one ethyl group are disordered over two sets of sites with refined occupancy ratios of 0.704 (2):0.296 (2) and 0.505 (3):0.495 (3), respectively. In the crystal, a weak inter-molecular C-H⋯O hydrogen inter-action is observed, involving the O atom of the major component of the disordered eth-oxy group.
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Affiliation(s)
- Mohamed Anoir Harrad
- Equipe de Chimie de Coordination et Catalyse, Faculté des Sciences-Semlalia, BP 2390, 40001 Marrakech, Morocco
| | - Brahim Boualy
- Equipe de Chimie de Coordination et Catalyse, Faculté des Sciences-Semlalia, BP 2390, 40001 Marrakech, Morocco
| | - Mustapha Ait Ali
- Equipe de Chimie de Coordination et Catalyse, Faculté des Sciences-Semlalia, BP 2390, 40001 Marrakech, Morocco
| | - Larbi El Firdoussi
- Equipe de Chimie de Coordination et Catalyse, Faculté des Sciences-Semlalia, BP 2390, 40001 Marrakech, Morocco
| | - Corrado Rizzoli
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Universitá degli Studi di Parma, Viale G. P. Usberti 17/A, I-43124 Parma, Italy
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12
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Fichtler R, Neudörfl JM, Jacobi von Wangelin A. Practical three-component synthesis of crowded arenes with donor–acceptor substitution. Org Biomol Chem 2011; 9:7224-36. [DOI: 10.1039/c1ob05984j] [Citation(s) in RCA: 11] [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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13
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Li L, Du D, Ren J, Wang Z. N-Heterocyclic Carbene Catalyzed Domino Reactions of Formylcyclopropane 1,1-Diesters: Construction of a 6-5-5 Tricyclic Pyrrolo[1,2-a]indole. European J Org Chem 2010. [DOI: 10.1002/ejoc.201001364] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Guo Y, Shao G, Li L, Wu W, Li R, Li J, Song J, Qiu L, Prashad M, Kwong FY. A General Approach to the Synthesis of β2-Amino Acid Derivatives via Highly Efficient Catalytic Asymmetric Hydrogenation of α-Aminomethylacrylates. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000122] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Harrad MA, Outtouch R, Ait Ali M, Firdoussi LE, Karim A, Roucoux A. Ca(CF3COO)2: An efficient Lewis acid catalyst for chemo- and regio-selective enamination of β-dicarbonyl compounds. CATAL COMMUN 2010. [DOI: 10.1016/j.catcom.2009.11.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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16
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Chen J, Zhang W, Geng H, Li W, Hou G, Lei A, Zhang X. Efficient synthesis of chiral beta-arylisopropylamines by using catalytic asymmetric hydrogenation. Angew Chem Int Ed Engl 2009; 48:800-2. [PMID: 19101975 DOI: 10.1002/anie.200805058] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jian Chen
- College of Chemistry and Molecular Sciences, Wuhan University, PR China
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17
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Chen J, Zhang W, Geng H, Li W, Hou G, Lei A, Zhang X. Efficient Synthesis of Chiral β-Arylisopropylamines by Using Catalytic Asymmetric Hydrogenation. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200805058] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Malkov AV, Stoncius S, Vranková K, Arndt M, Kocovský P. Dynamic Kinetic Resolution in the Asymmetric Synthesis of β-Amino Acids by Organocatalytic Reduction of Enamines with Trichlorosilane. Chemistry 2008; 14:8082-5. [PMID: 18666274 DOI: 10.1002/chem.200801244] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Andrei V Malkov
- Department of Chemistry, WestChem, University of Glasgow, Glasgow G12 8QQ, UK.
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19
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Han J, Ai T, Nguyen T, Li G. Chiral N-phosphonyl imine chemistry: asymmetric additions of ester enolates for the synthesis of beta-amino acids. Chem Biol Drug Des 2008; 72:120-6. [PMID: 18631372 PMCID: PMC2575089 DOI: 10.1111/j.1747-0285.2008.00682.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chiral phosphonyl imines attached by 1-naphthyl protection group were found to react with lithium ester enolates smoothly and give chiral beta-amino esters in good yields (70-88%) and up to excellent diastereoselectivity (>99:1 dr). Triisopropoxytitanium (IV) chloride was found to enhance diastereoseletivity when used as the Lewis acid promoter. The chiral auxiliary can be readily removed by treating with HBr to give free amino esters. The absolute structure has been unambiguously determined by converting one of the products into an authentic sample. This reaction provides an easy access to beta-amino acid derivatives.
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Affiliation(s)
- Jianlin Han
- Deprrtment of Chemistry & Biochemistry, Texas Tech University Lubbock, TX, 79401−1061 USA
| | - Teng Ai
- Deprrtment of Chemistry & Biochemistry, Texas Tech University Lubbock, TX, 79401−1061 USA
| | - Thao Nguyen
- Deprrtment of Chemistry & Biochemistry, Texas Tech University Lubbock, TX, 79401−1061 USA
| | - Guigen Li
- Deprrtment of Chemistry & Biochemistry, Texas Tech University Lubbock, TX, 79401−1061 USA
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20
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Tessier A, Lahmar N, Pytkowicz J, Brigaud T. Highly Diastereoselective Synthetic Route to Enantiopure β2-Amino Acids and γ-Amino Alcohols Using a Fluorinated Oxazolidine (Fox) as Chiral Auxiliary. J Org Chem 2008; 73:3970-3. [DOI: 10.1021/jo800562x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arnaud Tessier
- Laboratoire “Synthèse Organique Sélective et Chimie Organométallique” (SOSCO), UMR CNRS 8123, Université de Cergy-Pontoise, 5, Mail Gay Lussac Neuville sur Oise 95031, Cergy-Pontoise Cedex, France
| | - Nour Lahmar
- Laboratoire “Synthèse Organique Sélective et Chimie Organométallique” (SOSCO), UMR CNRS 8123, Université de Cergy-Pontoise, 5, Mail Gay Lussac Neuville sur Oise 95031, Cergy-Pontoise Cedex, France
| | - Julien Pytkowicz
- Laboratoire “Synthèse Organique Sélective et Chimie Organométallique” (SOSCO), UMR CNRS 8123, Université de Cergy-Pontoise, 5, Mail Gay Lussac Neuville sur Oise 95031, Cergy-Pontoise Cedex, France
| | - Thierry Brigaud
- Laboratoire “Synthèse Organique Sélective et Chimie Organométallique” (SOSCO), UMR CNRS 8123, Université de Cergy-Pontoise, 5, Mail Gay Lussac Neuville sur Oise 95031, Cergy-Pontoise Cedex, France
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21
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Bruneau C, Renaud JL, Jerphagnon T. Synthesis of β-aminoacid derivatives via enantioselective hydrogenation of β-substituted-β-(acylamino)acrylates. Coord Chem Rev 2008. [DOI: 10.1016/j.ccr.2007.09.013] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Abstract
An efficient, mild, and general method for the C-arylation of beta-enamino esters and ketones with arynes has been developed. This methodology provides a facile and direct access to a variety of substituted aromatic beta-enamino compounds in moderate to excellent yield. [reaction: see text]
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Affiliation(s)
- Yeeman K Ramtohul
- Department of Medicinal Chemistry, Merck Frosst Centre for Therapeutic Research, Merck Frosst Canada & Co. Inc., P.O. Box 1005, 16711 Trans Canada Highway, Kirkland, Quebec, Canada H9H 3L1.
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23
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Hoen R, Tiemersma-Wegman T, Procuranti B, Lefort L, de Vries JG, Minnaard AJ, Feringa BL. Enantioselective synthesis of β2-amino acids using rhodium-catalyzed hydrogenation. Org Biomol Chem 2007; 5:267-75. [PMID: 17205170 DOI: 10.1039/b615131k] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of protected beta2-dehydroamino acids has been prepared in three steps from commercially available starting materials in good yields. These were used as substrates in rhodium-catalyzed asymmetric hydrogenation applying a mixed ligand system of monodentate phosphoramidites and phosphines. Optimization of the catalyst structure was achieved by high throughput experimentation. High enantioselectivities were obtained (up to 91%) with full conversion for a number of beta-amino acids.
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Affiliation(s)
- Rob Hoen
- Stratingh Institute, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
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24
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Beddow JE, Davies SG, Ling KB, Roberts PM, Russell AJ, Smith AD, Thomson JE. Asymmetric synthesis of β2-amino acids: 2-substituted-3-aminopropanoic acids from N-acryloyl SuperQuat derivatives. Org Biomol Chem 2007; 5:2812-25. [PMID: 17700850 DOI: 10.1039/b707689d] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Conjugate addition of lithium dibenzylamide to (S)-N(3)-acryloyl-4-isopropyl-5,5-dimethyloxazolidin-2-one (derived from l-valine) and alkylation of the resultant lithium beta-amino enolate provides, after deprotection, a range of (S)-2-alkyl-3-aminopropanoic acids in good yield and high ee. Alternatively, via a complementary pathway, conjugate addition of a range of secondary lithium amides to (S)-N(3)-(2'-alkylacryloyl)-4-isopropyl-5,5-dimethyloxazolidin-2-ones, diastereoselective protonation with 2-pyridone, and subsequent deprotection furnishes a range of (R)-2-alkyl- and (R)-2-aryl-3-aminopropanoic acids in good yield and high ee. Additionally, the boron-mediated aldol reaction of beta-amino N-acyl oxazolidinones is a highly diastereoselective method for the synthesis of a range of beta-amino-beta'-hydroxy N-acyl oxazolidinones.
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Affiliation(s)
- James E Beddow
- Department of Organic Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, UK OX1 3TA
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25
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Swiderska MA, Stewart JD. Asymmetric Bioreductions of β-Nitro Acrylates as a Route to Chiral β2-Amino Acids. Org Lett 2006; 8:6131-3. [PMID: 17165947 DOI: 10.1021/ol062612f] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[Structure: see text] Reductions of beta-nitroacrylates by Saccharomyces carlsbergensis old yellow enzyme is the key step in a concise route to optically active beta2-amino acids. The enzymatic reductions occur with 87-96% ee, with larger substrates providing greater stereoselectivities. This work extends enantioselective enzymatic alkene reductions to include acyclic systems with weakly coordinating substituents.
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26
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Huang H, Liu X, Deng J, Qiu M, Zheng Z. Rhodium-Catalyzed Enantioselective Hydrogenation of β-Phthalimide Acrylates to Synthesis of β2-Amino Acids. Org Lett 2006; 8:3359-62. [PMID: 16836405 DOI: 10.1021/ol0612399] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Structure: see text] The enantioselective hydrogenation of beta-phthalimide acrylates provides the corresponding chiral beta2-amino acids in excellent enantiomeric excess catalyzed by Rh-monophosphorus.
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Affiliation(s)
- Hanmin Huang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China
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