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Han J, Lyutenko NV, Sorochinsky AE, Okawara A, Konno H, White S, Soloshonok VA. Tailor-Made Amino Acids in Pharmaceutical Industry: Synthetic Approaches to Aza-Tryptophan Derivatives. Chemistry 2021; 27:17510-17528. [PMID: 34913215 DOI: 10.1002/chem.202102485] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/24/2021] [Indexed: 12/22/2022]
Abstract
Over the recent years there has been a noticeable upsurge of interest in aza-analogs of tryptophan which are isosteric to the latter and found numerous applications in medicinal, bioorganic chemistry, and peptide research. In the present review article, five aza-tryptophan derivatives are profiled, including aza-substitution in the positions 2, on the five-membered ring, as well as in positions 4, 5, 6, and 7 on the six-membered ring. A detailed and comprehensive literature overview of the synthetic methods for the preparation of these aza-tryptophans is presented and general facets of the biological properties and most promising applications are discussed.
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Affiliation(s)
- Jianlin Han
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, P. R. China
| | - Nataliya V Lyutenko
- Department of Fine Organic Synthesis V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, The National Academy of Sciences of Ukraine, 1 Murmanska str., Kyiv, 02094, Ukraine
| | - Alexander E Sorochinsky
- Department of Fine Organic Synthesis V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, The National Academy of Sciences of Ukraine, 1 Murmanska str., Kyiv, 02094, Ukraine
| | - Ayaka Okawara
- Graduate School of Science and Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata, 992-8510, Japan
| | - Hiroyuki Konno
- Graduate School of Science and Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata, 992-8510, Japan
| | - Sarah White
- Oakwood Chemical, Inc., 730 Columbia Hwy. N, Estill, SC, 29918, USA
| | - Vadim A Soloshonok
- Department of Organic Chemistry I Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel Lardizábal 3, 20018, San Sebastián, Spain.,IKERBASQUE, Basque Foundation for Science, María Díaz de Haro 3, Plaza Bizkaia, 48013, Bilbao, Spain
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Grocholska P, Bąchor R. Trends in the Hydrogen-Deuterium Exchange at the Carbon Centers. Preparation of Internal Standards for Quantitative Analysis by LC-MS. Molecules 2021; 26:molecules26102989. [PMID: 34069879 PMCID: PMC8157363 DOI: 10.3390/molecules26102989] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/11/2021] [Accepted: 05/14/2021] [Indexed: 12/02/2022] Open
Abstract
The application of internal standards in quantitative and qualitative bioanalysis is a commonly used procedure. They are usually isotopically labeled analogs of the analyte, used in quantitative LC-MS analysis. Usually, 2H, 13C, 15N and 18O isotopes are used. The synthesis of deuterated isotopologues is relatively inexpensive, however, due to the isotopic effect of deuterium and the lack of isotopologue co-elution, usually they are not considered as good internal standards for LC-MS quantification. On the other hand, the preparation of 13C, 15N and 18O containing standards of drugs and their metabolites requires a complicated multistep de novo synthesis, starting from the isotopically labeled substrates, which are usually expensive. Therefore, there is a strong need for the development of low-cost methods for isotope-labeled standard preparations for quantitative analysis by LC-MS. The presented review concentrates on the preparation of deuterium-labeled standards by hydrogen−deuterium exchange reactions at the carbon centers. Recent advances in the development of the methods of isotopologues preparation and their application in quantitative analysis by LC-MS are evaluated.
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Ding PG, Hu XS, Zhou F, Zhou J. Catalytic enantioselective synthesis of α-chiral azides. Org Chem Front 2018. [DOI: 10.1039/c8qo00138c] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalytic asymmetric synthesis of α-chiral azides is of current interest and three synthetic strategies have been developed. This review summarizes the recent progress in this research area, discusses the advantages and limitations of each strategy, and outlines synthetic opportunities for future research.
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Affiliation(s)
- Pei-Gang Ding
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- People's Republic of China
| | - Xiao-Si Hu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- People's Republic of China
| | - Feng Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- People's Republic of China
| | - Jian Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- People's Republic of China
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de Bruin G, Mock ED, Hoogendoorn S, van den Nieuwendijk AMCH, Mazurek J, van der Marel GA, Florea BI, Overkleeft HS. Enantioselective synthesis of adamantylalanine and carboranylalanine and their incorporation into the proteasome inhibitor bortezomib. Chem Commun (Camb) 2016; 52:4064-7. [PMID: 26894389 DOI: 10.1039/c6cc01156j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The incorporation of adamantylalanine and carboranylalanine at the P2 site of bortezomib is well tolerated and provided potent cell permeable proteasome inhibitors with increased off-rates compared to bortezomib. Adamantylalanine and carboranylalanine were synthesized enantioselectively by an asymmetric Strecker reaction on Ellmans tert-butyl sulfinimines.
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Affiliation(s)
- Gerjan de Bruin
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Elliot D Mock
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Sascha Hoogendoorn
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | | | - Jaroslaw Mazurek
- Crystallics B.V., Meibergdreef 31, 1105 AZ Amsterdam, The Netherlands
| | - Gijsbert A van der Marel
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Bogdan I Florea
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Herman S Overkleeft
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
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Song G, Jin M, Li Z, Ouyang P. Asymmetric synthesis of α,β-diamino acid derivates via Mannich-type reactions of a chiral Ni(ii) complex of glycine with N-tosyl imines. Org Biomol Chem 2011; 9:7144-50. [DOI: 10.1039/c1ob05848g] [Citation(s) in RCA: 7] [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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Abstract
The increasing demand for stable isotopically labeled compounds has led to an increased interest in H/D-exchange reactions at carbon centers. Today deuterium-labeled compounds are used as internal standards in mass spectrometry or to help elucidate mechanistic theories. Access to these deuterated compounds takes place significantly more efficiently and more cost effectively by exchange of hydrogen by deuterium in the target molecule than by classical synthesis. This Review will concentrate on the preparative application of the H/D-exchange reaction in the preparation of deuterium-labeled compounds. Advances over the last ten years are brought together and critically evaluated.
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Affiliation(s)
- Jens Atzrodt
- Isotope Chemistry Metabolite Synthesis (ICMS), Sanofi-Aventis Deutschland GmbH, Industriepark Höchst, 65926 Frankfurt am Main, Germany.
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Lenda F, Guenoun F, Martinez J, Lamaty F. Synthesis of new tetrazole and triazole substituted pyroglutamic acid and proline derivatives. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.11.163] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ogawa C, Sugiura M, Kobayashi S. Stereospecific, enantioselective allylation of alpha-hydrazono esters by using allyltrichlorosilanes with BINAP dioxides as neutral-coordinate organocatalysts. Angew Chem Int Ed Engl 2006; 43:6491-3. [PMID: 15578770 DOI: 10.1002/anie.200461312] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Chikako Ogawa
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Lenda F, Guenoun F, Tazi B, Ben larbi N, Allouchi H, Martinez J, Lamaty F. Synthesis of New Tetrazole-Substituted Pyroaminoadipic and Pipecolic Acid Derivatives. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400328] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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12
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Ogawa C, Sugiura M, Kobayashi S. Stereospecific, Enantioselective Allylation of ?-Hydrazono Esters by Using Allyltrichlorosilanes with BINAP Dioxides as Neutral-Coordinate Organocatalysts. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200461312] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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15
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Abstract
Peptide and protein biological activities depend on their three dimensionals structures in the free state and when interacting with their receptors/acceptors. The backbone conformations such as alpha-helix, beta-sheet, beta-turn, and so forth provide critical templates for the three-dimensional structure, but the overall shape and intrinsic stereoelectronic properties of the peptide or protein important for molecular recognition, signal transduction, enzymatic specificity, immunomodulation, and other biological effects depend on arrangement of the side chain groups in three-dimensional chi space (their chi 1, chi 2, etc. torsional angles). In this paper we explore approaches to the de novo design of polypeptides and peptidomimetics with biased or specific conformational/topographical properties in chi space. We consider computational and experimental methods that can be used to examine the effects of specific structural modifications in constraining side chain groups of amino acid residues and their similarities in chi space to the natural amino acids to evaluate what sort of mimetics are likely to mimic normal amino acids. We then examine some of the asymmetric synthetic methods that are being developed to obtain the amino acid mimetics. Finally, we consider selected examples in the literature where these specialized amino acids have been incorporated in biologically active peptides and the specific insights they have provided regarding the topographical requirements for bioactive peptide potency, selectivity, and other biochemical and pharmacological properties. Constraints in chi space show great promise as useful tools in peptide, protein, and peptidomimetic de novo design of structures and pharmacophores with specific stereostructural, biochemical and biological properties.
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Affiliation(s)
- V J Hruby
- Department of Chemistry, University of Arizona, Tucson 85721, USA
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Abstract
Various methodologies published in the literature dealing with alpha-amino carboxylic acid asymmetric synthesis are presented in a digest form. In each case, only some recent or most typical works are mentioned.
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Affiliation(s)
- M Calmes
- Laboratoire des Aminoacides, Peptides et Protéines, UMR-CNRS 5810, Universités Montpellier I, France
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18
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Barrett AGM, Braddock DC, Christian PWN, Pilipauskas D, White AJP, Williams DJ. Diastereoselective Conjugate Addition to (+)-Camphorsulfonic Acid Derived Nitroalkenes: Synthesis of alpha-Hydroxy and alpha-Amino Acids. J Org Chem 1998; 63:5818-5823. [PMID: 11672182 DOI: 10.1021/jo980582r] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective tandem conjugate addition of both oxygen- and nitrogen-centered nucleophiles to the novel (1S)-10-camphorsulfonic acid derived nitroalkenes 9, 10, and 11 and ozonolysis gave the alpha-hydroxy and alpha-amino thiol acid derivatives 12, 13, and 14. In all cases, the (R)-diastereomer was formed as the major component albeit with only modest levels of selectivity (33-71% de). The structures of the products and the stereochemistry of the Michael addition step were unequivocally established by X-ray crystallographic studies of nitroalkenes 9 and 10 and (2S)-12c and (2R)-13a and by alternative syntheses from (S)-alanine, (S)-valine, and ethyl (S)-lactate.
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Affiliation(s)
- Anthony G. M. Barrett
- Department of Chemistry, Imperial College, South Kensington, London, SW7 2AY, UK and Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208
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Allin SM, Bulman Page PC. THE DEVELOPMENT AND APPLICATION OF 1,3-DITHIANE 1-OXIDE DERIVATIVES AS CHIRAL AUXILIARIES AND ASYMMETRIC BUILDING BLOCKS FOR ORGANIC SYNTHESIS. A REVIEW. ORG PREP PROCED INT 1998. [DOI: 10.1080/00304949809355275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Péter A, Tóth G. Chromatographic methods for the separation of enantiomers and epimers of β-alkyl amino acids and peptides containing them. Anal Chim Acta 1997. [DOI: 10.1016/s0003-2670(97)00224-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kelly NM, Sutherland A, Willis CL. Syntheses of amino acids incorporating stable isotopes. Nat Prod Rep 1997. [DOI: 10.1039/np9971400205] [Citation(s) in RCA: 32] [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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22
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Ghosh SK, Verma R, Ghosh U, Mamdapur VR. A Fast Procedure for the Preparation of Amides/Peptides from Carboxylic Acids and Azides via Two Redox Reactions: Application to the Synthesis of Methionine Enkephalin. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1996. [DOI: 10.1246/bcsj.69.1705] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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23
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Angibaud P, Chaumette J, Desmurs J, Duhamel L, Plé G, Valnot J, Duhamel P. Asymmetric Synthesis of 2-chloro- and 2-bromo-alkanoic acids by halogenation of α-D-glucofuranose-derived silyl ketene acetals. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0957-4166(95)00251-j] [Citation(s) in RCA: 11] [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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24
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Bulman Page PC, McKenzie MJ, Allin SM, Collington EW, Carr RA. Enolate bromination in 2-acyl-1,3-dithiane 1-oxides. Tetrahedron 1995. [DOI: 10.1016/0040-4020(94)01007-m] [Citation(s) in RCA: 9] [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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25
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Li G, Patel D, Hruby VJ. 1, 2-Asymmetric cis induction and its application to the asymmetric synthesis of precursors of β-branched unusual amino acids. Tetrahedron Lett 1994. [DOI: 10.1016/0040-4039(94)85204-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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26
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Boteju LW, Wegner K, Qian X, Hruby VJ. Asymmetric synthesis of unusual amino acids: Synthesis of optically pure isomers of N-indole- (2-mesitylenesulfonyl)-β-methyltryptophan. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)86957-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Asymmetric synthesis of (2R, 3S) and (2S, 3R) precursors of β-methyl-histidine, -phenylalanine and -tyrosine. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/s0957-4166(00)80091-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Li G, Russell KC, Jarosinski MA, Hruby VJ. Asymmetric synthesis of unusual amino acids : An enantioselective synthesis of the four isomers of D- and L-O-Methyl-2′, β-Dimethyltyrosine. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)77626-x] [Citation(s) in RCA: 27] [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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30
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Asymmetric synthesis of α-amino acids through α-iodination of chiral unsaturated carboxamides and stereoselective iodolactonization. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)60372-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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31
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Cativiela C, Diaz-de-Vuiegas MD, Gálvez JA. Synthesis of Chiral 2-Chloroacrylic Esters. SYNTHETIC COMMUN 1992. [DOI: 10.1080/00397919208021107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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32
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Preparation of (R)-2-azidoesters from 2-((p-nitrobenzene)sulfonyl)oxy esters and their use as protected amino acid equivalents for the synthesis of di- and tripeptides containing D-amino acid constituents. Tetrahedron 1992. [DOI: 10.1016/s0040-4020(01)92245-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Diastereoselective fluorination of chiral imide enolates using n-fluoro-o-benzenedisulfonimide (nfobs). Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)91883-5] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Ager DJ, East MB. Methodology to establish 1,2- and 1,3-difunctionality for the synthesis of carbohydrate derivates. Tetrahedron 1992. [DOI: 10.1016/s0040-4020(01)90970-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Boteju LW, Wegner K, Hruby VJ. Asymmetric synthesis of unusual amino acids: Synthesis of the optically pure isomers of indole-protected β-methyltryptophan suitable for peptide synthesis. Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)60804-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Oppolzer W, Tamura O. Asymmetric synthesis of α-amino acids and α-N-hydroxyamino acids via electrophilic amination of bornanesultam-derived enolates with 1-chloro-1-nitrosocyclohexane. Tetrahedron Lett 1990. [DOI: 10.1016/s0040-4039(00)94411-3] [Citation(s) in RCA: 114] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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40
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Baldwin JE, North M, Flinn A, Moloney MG. Synthesis of nonproteinogenic amino acids part 2: preparation of a synthetic equivalent of the γ anion synthon for asymmetric amino acid synthesis. Tetrahedron 1989. [DOI: 10.1016/0040-4020(89)80144-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Baldwin JE, Moloney MG, North M. Non-proteinogenic amino acid synthesis. The β-anion derived from aspartic acid, and its application to α-amino acid synthesis. Tetrahedron 1989. [DOI: 10.1016/s0040-4020(01)85140-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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43
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Kunz H, Pfrengle W. Carbohydrates as chiral templates: asymmetric ugi-synthesis of alpha-amino acids using galactosylamines as the chiral matrices. Tetrahedron 1988. [DOI: 10.1016/s0040-4020(01)86054-3] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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44
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Dillen JL, Meth-Cohn O, Moore C, van Rooyen PH. Chiral thiophene dioxides and thiophene S,N-ylides as dienes for asymmetric diels-aldlr application. Tetrahedron 1988. [DOI: 10.1016/s0040-4020(01)85944-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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45
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46
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Oppolzer W, Moretti R. Enantioselective systheses of α-amino acids from 10-sulfonamido-isobornyl esters and di-t-butyl azodicarboxylate. Tetrahedron 1988. [DOI: 10.1016/s0040-4020(01)86059-2] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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47
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Oppolzer W, Poli G, Kingma AJ, Starkemann C, Bernardinelli G. Asymmetric Induction at C(?) and C(?) ofN-Enoylsultams by Organomagnesium 1,4-Addition/Enolate Trapping. Helv Chim Acta 1987. [DOI: 10.1002/hlca.19870700825] [Citation(s) in RCA: 98] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Giger RK, Loosli HR, Walkinshaw MD, Clark BJ, Vigouret JM. A new semisynthetic ergot peptide alkaloid: DCN 203-922. EXPERIENTIA 1987; 43:1125-30. [PMID: 2959497 DOI: 10.1007/bf01956061] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We report the synthesis, stereochemistry and preliminary pharmacological evaluation of DCN 203-922, a novel ergot alkaloid of the cyclol type, which contains in its peptide moiety the uncommon amino acid L-allo-isoleucine.
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Affiliation(s)
- R K Giger
- Preclinical Research, Sandoz Ltd., Basel, Switzerland
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49
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Evans DA, Ellman JA, Dorow RL. Asymmetric halogenation of chiral imide enolates. A general approach to the synthesis of enantiomerically pure α-amino acids. Tetrahedron Lett 1987. [DOI: 10.1016/s0040-4039(00)95305-x] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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50
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Sasaki N, Hashimoto C, Potier P. A novel approach to the synthesis of optically pure non protein α-amino acids in both L and D configurations from L-serine. Tetrahedron Lett 1987. [DOI: 10.1016/s0040-4039(00)96866-7] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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