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Yang J, Ruan P, Yang W, Feng X, Liu X. Enantioselective carbene insertion into the N-H bond of benzophenone imine. Chem Sci 2019; 10:10305-10309. [PMID: 32110317 PMCID: PMC6979361 DOI: 10.1039/c9sc03354h] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 09/16/2019] [Indexed: 01/09/2023] Open
Abstract
Efficient enantioselective insertion of α-diazoesters into the N-H bond of N-sp2-hybridized benzophenone imine was realized by using Rh2(esp)2 and chiral guanidine cooperative catalysis. Both aliphatic and aromatic substituted α-amino esters were obtained in high yields (up to 99%) and good enantioselectivities (up to 95.5 : 4.5 er) under mild reaction conditions.
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Affiliation(s)
- Jian Yang
- Key Laboratory of Green Chemistry & Technology , Ministry of Education , College of Chemistry , Sichuan University , Chengdu 610064 , China .
| | - Peiran Ruan
- Key Laboratory of Green Chemistry & Technology , Ministry of Education , College of Chemistry , Sichuan University , Chengdu 610064 , China .
| | - Wei Yang
- Key Laboratory of Green Chemistry & Technology , Ministry of Education , College of Chemistry , Sichuan University , Chengdu 610064 , China .
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology , Ministry of Education , College of Chemistry , Sichuan University , Chengdu 610064 , China .
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology , Ministry of Education , College of Chemistry , Sichuan University , Chengdu 610064 , China .
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2
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Patil PC, Luzzio FA. Unnatural Amino Acid Derivatives through Click Chemistry: Synthesis of Triazolylalanine Analogues. Synlett 2018; 28:1729-1732. [PMID: 29904233 DOI: 10.1055/s-0036-1588510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
A novel tert-butyl 2-(1-oxoisolndolin-2-yl)acetate derivative is selectively alkylated with propargyl bromide in the presence of lithium hexamethyldisilazide. After removal of the tert-butyl protecting group, the resulting N-isoindolinyl (ethynylalanine) derivative is reacted with a series of azides under 'click conditions'. The click reactions afford an array of N-isoindolinyl-1,2,3-triazolylalanine derivatives as the free carboxylic adds. Following esterification, the N-isoindolinone protecting group is then transformed into the more easily removable phthaloyl group by selective oxidation at the benzylic position.
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Affiliation(s)
- Pravin C Patil
- Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, Kentucky 40292, USA
| | - Frederick A Luzzio
- Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, Kentucky 40292, USA
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3
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Jiao J, Zhang JR, Liao YY, Xu L, Hu M, Tang RY. CuCl/air-mediated oxidative coupling reaction of imidazoheterocycles with N-aryl glycine esters. RSC Adv 2017. [DOI: 10.1039/c7ra05303g] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel CuCl/air-mediated oxidative cross-coupling of imidazoheterocycles with glycine esters has been developed.
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Affiliation(s)
- Jing Jiao
- Department of Applied Chemistry
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Jun-Rong Zhang
- Department of Applied Chemistry
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Yan-Yan Liao
- Department of Applied Chemistry
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Li Xu
- Department of Applied Chemistry
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Maolin Hu
- College of Chemistry and Materials Engineering
- Wenzhou University
- Wenzhou 325035
- China
| | - Ri-Yuan Tang
- Department of Applied Chemistry
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
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4
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Zhu Y, Liu X, Dong S, Zhou Y, Li W, Lin L, Feng X. Asymmetric NH Insertion of Secondary and Primary Anilines under the Catalysis of Palladium and Chiral Guanidine Derivatives. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201308501] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Zhu Y, Liu X, Dong S, Zhou Y, Li W, Lin L, Feng X. Asymmetric NH Insertion of Secondary and Primary Anilines under the Catalysis of Palladium and Chiral Guanidine Derivatives. Angew Chem Int Ed Engl 2014; 53:1636-40. [DOI: 10.1002/anie.201308501] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 12/04/2013] [Indexed: 11/11/2022]
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Huang W, Ye JL, Zheng W, Dong HQ, Wei BG. Radical migration-addition of N-tert-butanesulfinyl imines with organozinc reagents. J Org Chem 2013; 78:11229-37. [PMID: 24160561 DOI: 10.1021/jo401640c] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel migration-addition sequence was discovered for the reaction of enantioenriched N-tert-butanesulfinyl iminoacetate 1a with functionalized benzylzinc bromide reagents, producing tert-leucine derivatives in excellent diastereoselectivity (dr 98:2). The absolute configurations of two new chiral centers were unambiguously assigned by chemical transformations and X-ray crystallography. In addition, the regio- and diastereoselectivities of this novel reaction were both explained through the key N-sulfinamine intermediate M6 generated by the tert-butyl radical attack on the imine. Computational analysis of this reaction process, which was performed at the B3LYP/6-311++G(3df,2p)//B3LYP/6-31G*-LANL2DZ level, also supported our proposed two-stage mechanism.
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Affiliation(s)
- Wei Huang
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University , 220 Handan Road, Shanghai 200433, China
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7
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Du J, Duan JJ, Zhang Q, Hou J, Bai F, Chen N, Bai G. Enzymatic synthesis of L-tryptophan from D,L-2-amino-Δ2-thiazoline-4-carboxylic acid and indole by Pseudomonas sp. TS1138 L-2-amino-Δ2-thiazoline-4-carboxylic acid hydrolase, S-carbamyl-L-cysteine amidohydrolase and Escherichia coli L-tryptophanase. APPL BIOCHEM MICRO+ 2012. [DOI: 10.1134/s0003683812020056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Scott WL, Alsina J, Audu CO, Babaev E, Cook L, Dage JL, Goodwin LA, Martynow JG, Matosiuk D, Royo M, Smith JG, Strong AT, Wickizer K, Woerly EM, Zhou Z, O'Donnell MJ. Distributed Drug Discovery, Part 2: global rehearsal of alkylating agents for the synthesis of resin-bound unnatural amino acids and virtual D(3) catalog construction. ACTA ACUST UNITED AC 2009; 11:14-33. [PMID: 19105725 PMCID: PMC2651687 DOI: 10.1021/cc800184v] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
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Distributed Drug Discovery (D3) proposes solving large drug discovery problems by breaking them into smaller units for processing at multiple sites. A key component of the synthetic and computational stages of D3 is the global rehearsal of prospective reagents and their subsequent use in the creation of virtual catalogs of molecules accessible by simple, inexpensive combinatorial chemistry. The first section of this article documents the feasibility of the synthetic component of Distributed Drug Discovery. Twenty-four alkylating agents were rehearsed in the United States, Poland, Russia, and Spain, for their utility in the synthesis of resin-bound unnatural amino acids 1, key intermediates in many combinatorial chemistry procedures. This global reagent rehearsal, coupled to virtual library generation, increases the likelihood that any member of that virtual library can be made. It facilitates the realistic integration of worldwide virtual D3 catalog computational analysis with synthesis. The second part of this article describes the creation of the first virtual D3 catalog. It reports the enumeration of 24 416 acylated unnatural amino acids 5, assembled from lists of either rehearsed or well-precedented alkylating and acylating reagents, and describes how the resulting catalog can be freely accessed, searched, and downloaded by the scientific community.
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Affiliation(s)
- William L Scott
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, Indiana 46202-3274, USA.
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9
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Nakatsuka H, Shimokawa K, Miwa R, Yamada K, Uemura D. First total synthesis and biological evaluation of the cyclic heptapeptide rhizonin A. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2008.10.124] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Lu TJ, Lin CK. Asymmetric Synthesis of α-Amino Acids: Preparation and Alkylation of Monocyclic Iminolactones Derived from α-Methyl trans-Cinnamaldehyde. J Org Chem 2008; 73:9527-34. [DOI: 10.1021/jo801514g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Ta-Jung Lu
- Department of Chemistry, National Chung-Hsing University, Taichung, Taiwan 40227, Republic of China
| | - Cheng-Kun Lin
- Department of Chemistry, National Chung-Hsing University, Taichung, Taiwan 40227, Republic of China
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12
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Preparation of chiral derivatives of β-Ala containing the α-phenylethyl group: useful starting materials for the asymmetric synthesis of β-amino acids. Nat Protoc 2007; 2:2759-66. [DOI: 10.1038/nprot.2007.375] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Bull SD, Davies SG, Garner AC, Parkes AL, Roberts PM, Sellers TGR, Smith AD, Tamayo JA, Thomson JE, Vickers RJ. On the origins of diastereoselectivity in the alkylation of diketopiperazine enolates. NEW J CHEM 2007. [DOI: 10.1039/b701628j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Szymanski W, Ostaszewski R. Multicomponent diversity and enzymatic enantioselectivity as a route towards both enantiomers of α-amino acids—a model study. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.09.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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16
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Ortega M, Rodríguez MA, Campos PJ. Photoreduction of imines. An environmentally friendly approach to obtain amines. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.09.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Dixon DJ, Horan RAJ, Monck NJT. CamTHP*OH: A Camphor-Derived δ-Lactol Auxiliary for the Effective Desymmetrization of Attached Glycinamide Residues. Asymmetric Synthesis of α-Amino Carbonyl Compounds. Org Lett 2004; 6:4423-6. [PMID: 15548041 DOI: 10.1021/ol048569i] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Stereoselective allylation of camphor and subsequent terminal hydroformylation affords a new delta-lactol auxiliary (camTHP*OH) on multigram scale. Stereoselective condensation with glycine dimethylamide and Cbz protection affords a camTHP*-desymmetrized glycinamide building block which undergoes efficient and highly diastereoselective metal enolate alkylation reactions. Acid-mediated deprotection affords the N-Cbz-protected alpha-amino amide products which may be converted directly to alpha-amino ketones on treatment with Grignard or organolithium reagents without loss of stereochemical integrity. [reaction: see text]
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Affiliation(s)
- Darren J Dixon
- Department of Chemistry, University of Manchester, Manchester M13 9PL, U.K.
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18
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Harding CI, Dixon DJ, Ley SV. The preparation and alkylation of a butanedione-derived chiral glycine equivalent and its use for the synthesis of α-amino acids and α,α-disubstituted amino acids. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.063] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Dixon DJ, Horan RA, Monck NJ. 6-Methyl δ-lactol derived chiral glycine equivalents for the asymmetric synthesis of protected α-amino amides. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.01.026] [Citation(s) in RCA: 6] [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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20
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Tarábek P, Bonifačić M, Naumov S, Beckert D. Time Resolved FT EPR Identification of (E) and (Z) Conformational Isomers of Glycyl Radicals Formed upon Photoinduced Oxidation of Glycine Esters in Aqueous Solutions. J Phys Chem A 2004. [DOI: 10.1021/jp0367070] [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)
- Peter Tarábek
- Interdisciplinary Research Group “Time-Resolved Spectroscopy”, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany, Department of Physical Chemistry, Ruder Bošković Institute, Bijenička c. 54, HR-10 000 Zagreb, Croatia, and Leibniz-Institute of Surface Modification, Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany
| | - Marija Bonifačić
- Interdisciplinary Research Group “Time-Resolved Spectroscopy”, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany, Department of Physical Chemistry, Ruder Bošković Institute, Bijenička c. 54, HR-10 000 Zagreb, Croatia, and Leibniz-Institute of Surface Modification, Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany
| | - Sergei Naumov
- Interdisciplinary Research Group “Time-Resolved Spectroscopy”, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany, Department of Physical Chemistry, Ruder Bošković Institute, Bijenička c. 54, HR-10 000 Zagreb, Croatia, and Leibniz-Institute of Surface Modification, Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany
| | - Dieter Beckert
- Interdisciplinary Research Group “Time-Resolved Spectroscopy”, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany, Department of Physical Chemistry, Ruder Bošković Institute, Bijenička c. 54, HR-10 000 Zagreb, Croatia, and Leibniz-Institute of Surface Modification, Leipzig, Permoserstrasse 15, Leipzig, D-04318 Germany
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Abstract
With the exploitation of new uses and the growing markets of amino acids, amino acid production technology has made large progress during the latter half of the 20th century. Fermentation technology has played crucial roles in this progress, and currently the fermented amino acids represent chief products of biotechnology in both volume and value. This area is highly competitive in the world market and process economics are of primary importance. For cost-effective production, many technologies have been developed to establish high-productive fermentation and recovery processes. The producer organisms used in large-scale, well-established processes have been developed to a high level of production efficiency. The tools of genetic engineering of amino acid-producing organisms have been well developed and are now being applied for enlargement of biosynthetic and transport capacity, which is beginning to have a great impact on the amino acid industry. Furthermore, the rapid strides in genome analysis are bound to revolutionize the strain improvement methodology.
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Affiliation(s)
- Masato Ikeda
- Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Ltd, 3-6-6, Asahi-machi, Machida, Tokyo 194-8533, Japan.
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22
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Durham TB, Miller MJ. An enantioselective synthesis of differentially protected erythro-alpha,beta-diamino acids and its application to the synthesis of an analogue of rhodopeptin B5. J Org Chem 2003; 68:35-42. [PMID: 12515458 DOI: 10.1021/jo016276m] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Methodology for the enantioselective synthesis of differentially protected erythro-alpha,beta-diamino acids from N-tosyloxy beta-lactams is reported. The requisite N-tosyloxy beta-lactams are readily available from simple beta-keto esters. The reported approach is flexible and compatible with a variety of functional groups. The synthetic utility of the method is demonstrated through its application to the preparation of an analogue of the antifungal cyclic peptide rhodopeptin B5.
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Affiliation(s)
- Timothy B Durham
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA
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Spetzler JC, Hoeg-Jensen T. A new amino acid derivative with a masked side-chain aldehyde and its use in peptide synthesis and chemoselective ligation. J Pept Sci 2001; 7:537-51. [PMID: 11695649 DOI: 10.1002/psc.349] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A new amino acid derivative with a diol side-chain, L-2-amino-4,5-dihydroxy-pentanoic acid (Adi), has been prepared from L-allylglycine by suitable protection, for use in peptide synthesis, as Fmoc-L-Adi(Trt)2. This building block enables the introduction of a side-chain aldehyde at any position in a given peptide sequence without use of specialized side-chain protection schemes. The aldehyde is revealed by mild oxidation with sodium periodate, circumventing the problematic release of reactive peptidic aldehydes in TFA solution. Peptides with aldehyde side-chains are useful for chemo-selective ligation, reacting selectively with oxyamines to yield oxime links, while all other peptide functions can be left unprotected. The utility of the new building block has been demonstrated by the synthesis of peptide dimers and a cyclo-peptide.
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Knowles HS, Hunt K, Parsons AF. A photochemical approach to phenylalanines and related compounds by alkylation of glycine. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00783-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Gutiérrez-Garcı́a VM, López-Ruiz H, Reyes-Rangel G, Juaristi E. Enantioselective synthesis of β-amino acids. Part 11: Diastereoselective alkylation of chiral derivatives of β-aminopropionic acid containing the α-phenethyl group. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00540-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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26
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O'Donnell MJ, Delgado F. Enantiomeric enrichment of α-amino acid derivatives: recrystallization of N-Fmoc α-amino acid tert-butyl esters. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00554-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Boesten WH, Seerden JP, de Lange B, Dielemans HJ, Elsenberg HL, Kaptein B, Moody HM, Kellogg RM, Broxterman QB. Asymmetric Strecker Synthesis of α-Amino Acids via a Crystallization-Induced Asymmetric Transformation Using (R)-Phenylglycine Amide as Chiral Auxiliary. Org Lett 2001; 3:1121-4. [PMID: 11348174 DOI: 10.1021/ol007042c] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text]. Diastereoselective Strecker reactions based on (R)-phenylglycine amide as chiral auxiliary are reported. The Strecker reaction is accompanied by an in situ crystallization-induced asymmetric transformation, whereby one diastereomer selectively precipitates and can be isolated in 76-93% yield and dr > 99/1. The diastereomerically pure alpha-amino nitrile obtained from pivaldehyde (R1 = t-Bu, R2 = H) was converted in three steps to (S)-tert-leucine in 73% yield and >98% ee.
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Affiliation(s)
- W H Boesten
- DSM Research Life Sciences-Organic Chemistry and Biocatalysis, P.O. Box 18, 6160 MD Geleen, and Syncom B.V., Kadijk 3, 9747 AT Groningen, The Netherlands
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28
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The asymmetric synthesis of unnatural α-amino acids as building blocks for complex molecule synthesis. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1047-773x(01)80004-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Saaby S, Fang X, Gathergood N, Jørgensen K. Formation of Optically Active Aromaticα-Amino Acids by Catalytic Enantioselective Addition of Imines to Aromatic Compounds. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20001117)112:22<4280::aid-ange4280>3.0.co;2-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Saaby S, Fang X, Gathergood N, Jørgensen KA. Formation of Optically Active Aromatic alpha-Amino Acids by Catalytic Enantioselective Addition of Imines to Aromatic Compounds This work was made possible by a grant from the Danish National Research Foundation. Thanks are provided to Dr. Rita G. Hazell for X-ray analysis. Angew Chem Int Ed Engl 2000; 39:4114-4116. [PMID: 11093224 DOI: 10.1002/1521-3773(20001117)39:22<4114::aid-anie4114>3.0.co;2-v] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- S Saaby
- Center for Metal Catalyzed Reactions Department of Chemistry Aarhus University 8000 Aarhus C (Denmark)
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