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Kriegelstein M, Profous D, Přibylka A, Cankař P. The Assignment of the Absolute Configuration of β-Chiral Primary Alcohols with Axially Chiral Trifluoromethylbenzimidazolylbenzoic Acid. J Org Chem 2020; 85:12912-12921. [DOI: 10.1021/acs.joc.0c01510] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Michal Kriegelstein
- Department of Organic Chemistry, Faculty of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
| | - David Profous
- Department of Organic Chemistry, Faculty of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
| | - Adam Přibylka
- Department of Organic Chemistry, Faculty of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
| | - Petr Cankař
- Department of Organic Chemistry, Faculty of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
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2
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Prasad D, Mogurampelly S, Chaudhari SR. R-VAPOL-phosphoric acid based 1H and 13C-NMR for sensing of chiral amines and acids. RSC Adv 2020; 10:2303-2312. [PMID: 35494596 PMCID: PMC9048436 DOI: 10.1039/c9ra07803g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 01/04/2020] [Indexed: 01/07/2023] Open
Abstract
Enantiomers have significant importance in pharmaceuticals, biology and modern chemistry and therefore distinguishing and quantifying the enantiomeric forms is of utmost importance. Herein, we propose diphenyl-3,3'-biphenanthryl-4,4'-diyl phosphate (R-VAPOL-PA) as a promising chiral solvating agent to discriminate amines and acids of poly-functional groups such as chiral amines, amino alcohols and hydroxy acids. The methodological approach involves using the nature of hydrogen bonds and ion pairs as a mode of weak interactions to form diastereomers where the probe is associated with enantiomers. The resulting diastereomer difference in the NMR spectrum enables the chiral discrimination with a complete baseline peak separation and an accurate enantiomeric excess (ee) analysis. We also carried out density functional theory (DFT) calculations to understand the complex formation to explain enantiodiscrimination by analysing the formation and stability of different chiral complexes. The binding energy differences between enantiomeric forms revealed by DFT calculations are qualitatively in agreement with the diastereomer difference in the NMR spectrum and unequivocally establishes the suggested experimental protocol of R-VAPOL-PA-based enantiomeric discrimination.
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Affiliation(s)
- Durga Prasad
- Department of Spice and Flavour Science, CSIR-Central Food Technological Research Institute Mysore Karnataka 570020 India
| | - Santosh Mogurampelly
- Department of Physics, Indian Institute of Technology Jodhpur Karwar Rajasthan 342037 India
| | - Sachin R Chaudhari
- Department of Spice and Flavour Science, CSIR-Central Food Technological Research Institute Mysore Karnataka 570020 India
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3
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Gao J, Rajan S, Wang B. In-tube derivatization for determination of absolute configuration and enantiomeric purity of chiral compounds by NMR spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2017; 55:269-273. [PMID: 26919167 DOI: 10.1002/mrc.4419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 01/08/2016] [Accepted: 01/27/2016] [Indexed: 06/05/2023]
Abstract
We have developed an in-tube derivatization method using commercially available polymer-supported coupling agents to prepare derivatives of chiral compounds directly in NMR tube with high yield and purity. Because the method does not require any workup or purification, the configuration and enatiopurity can be quickly determined by NMR analysis for a small amount of chiral compounds, which is critical for today's fast-paced medicinal chemistry efforts in drug discovery. The application of the method was demonstrated for the derivatization of chiral amines, alcohols, diols, amino alcohols, thiols, and carboxylic acids using various chiral derivatizing agents and coupling agents. This article also serves as a practical guide for in-tube derivatization and selection of suitable chiral derivatizing agents and coupling agents for various types of chiral compounds. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Jinhai Gao
- Global Discovery Chemistry, Novartis Institutes for Biomedical Research, Inc., Cambridge, MA, 02139, USA
| | - Srinivasan Rajan
- Global Discovery Chemistry, Novartis Institutes for Biomedical Research, Inc., Cambridge, MA, 02139, USA
| | - Bing Wang
- Global Discovery Chemistry, Novartis Institutes for Biomedical Research, Inc., Cambridge, MA, 02139, USA
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4
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Shyshkanov SA, Orlov NV. Design of Selenium-Based Chiral Chemical Probes for Simultaneous Enantio- and Chemosensing of Chiral Carboxylic Acids with Remote Stereogenic Centers by NMR Spectroscopy. Chemistry 2016; 22:15458-15467. [DOI: 10.1002/chem.201602884] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Sergey A. Shyshkanov
- Zelinsky Institute of Organic Chemistry; Russian Academy of Sciences; Leninsky Prospekt, 47 Moscow 119991 Russia
| | - Nikolai V. Orlov
- Zelinsky Institute of Organic Chemistry; Russian Academy of Sciences; Leninsky Prospekt, 47 Moscow 119991 Russia
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5
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Peng R, Lin L, Zhang Y, Wu W, Lu Y, Liu X, Feng X. The assignment of the configuration for α-hydroxy acid esters using a CEC strategy. Org Biomol Chem 2016; 14:5258-62. [PMID: 27189590 DOI: 10.1039/c6ob00927a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and efficient (1)H NMR method for determining the absolute configuration of chiral α-hydroxy acid esters using a competing enantioselective conversion (CEC) strategy was developed. The α-hydroxy acid esters were acylated in the presence of Feng's chiral N,N'-dioxide-scandium(iii) complex, and the faster reaction was identified when one enantiomer of the chiral α-hydroxy acid ester was treated with both enantiomers of the ligand by NMR analysis of the reaction mixture without further purification. A mnemonic is presented to aid the assignment of the absolute configuration of the substrates.
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Affiliation(s)
- Ruixue Peng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China.
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6
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Bian G, Fan H, Huang H, Yang S, Zong H, Song L, Yang G. Highly Effective Configurational Assignment Using Bisthioureas as Chiral Solvating Agents in the Presence of DABCO. Org Lett 2015; 17:1369-72. [DOI: 10.1021/acs.orglett.5b00030] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Guangling Bian
- The Key Laboratory of Coal to Ethylene
Glycol and Its Related Technology, Fujian Institute of Research on
the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Hongjun Fan
- The State Key Lab of Molecular Reaction Dynamics, Dalian Institute
of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Huayin Huang
- The Key Laboratory of Coal to Ethylene
Glycol and Its Related Technology, Fujian Institute of Research on
the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Shiwei Yang
- The Key Laboratory of Coal to Ethylene
Glycol and Its Related Technology, Fujian Institute of Research on
the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Hua Zong
- The Key Laboratory of Coal to Ethylene
Glycol and Its Related Technology, Fujian Institute of Research on
the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Ling Song
- The Key Laboratory of Coal to Ethylene
Glycol and Its Related Technology, Fujian Institute of Research on
the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Genjin Yang
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
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7
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Designing chiral derivatizing agents (CDA) for the NMR assignment of the absolute configuration: a theoretical and experimental approach with thiols as a case study. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.10.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Kainz QM, Linhardt R, Maity PK, Hanson PR, Reiser O. Ring-opening metathesis polymerization-based recyclable magnetic acylation reagents. CHEMSUSCHEM 2013; 6:721-729. [PMID: 23427021 DOI: 10.1002/cssc.201200453] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 10/10/2012] [Indexed: 06/01/2023]
Abstract
An operationally simple method for the acylation of amines utilizing carbon-coated metal nanoparticles as recyclable supports is reported. Highly magnetic carbon-coated cobalt (Co/C) and iron (Fe/C) nanobeads were functionalized with a norbornene tag (Nb-tag) through a "click" reaction followed by surface activation employing Grubbs-II catalyst and subsequent grafting of acylated N-hydroxysuccinimide ROMPgels (ROMP=ring-opening metathesis polymerization). The high loading (up to 2.6 mmolg(-1) ) hybrid material was applied in the acylation of various primary and secondary amines. The products were isolated in high yields (86-99%) and excellent purities (all >95 % by NMR spectroscopy) after rapid magnetic decantation and simple evaporation of the solvents. The spent resins were successfully re-acylated by acid chlorides, anhydrides, and carboxylic acids and reused for up to five consecutive cycles without considerable loss of activity.
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Affiliation(s)
- Quirin M Kainz
- Institute for Organic Chemistry, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany
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9
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Leiras S, Freire F, Seco JM, Quiñoá E, Riguera R. Controlled modulation of the helical sense and the elongation of poly(phenylacetylene)s by polar and donor effects. Chem Sci 2013. [DOI: 10.1039/c3sc50835h] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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10
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Park M, Kim SM, Choi K. Aminoindanol-based chiral derivatizing agents for the determination of the absolute configuration of carboxylic acids. Org Biomol Chem 2012; 10:8051-4. [PMID: 22955968 DOI: 10.1039/c2ob26168e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New chiral derivatizing agents have been prepared through a simple, short-step synthesis. The absolute configuration of α-chiral carboxylic acids can be assigned on the basis of the NMR chemical shift difference between diastereomeric esters. Because of the modular structures of the agents, the anisotropic effect could be easily manipulated to afford large chemical shift differences even in polar solvents.
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Affiliation(s)
- Minjung Park
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 136-701, Republic of Korea
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11
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Chaudhari SR, Suryaprakash N. Simple and efficient methods for discrimination of chiral diacids and chiral alpha-methyl amines. Org Biomol Chem 2012; 10:6410-9. [PMID: 22735343 DOI: 10.1039/c2ob25599e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The three-component chiral derivatization protocols have been developed for (1)H, (13)C and (19)F NMR spectroscopic discrimination of chiral diacids by their coordination and self-assembly with optically active (R)-α-methylbenzylamine and 2-formylphenylboronic acid or 3-fluoro-2-formylmethylboronic acid. These protocols yield a mixture of diastereomeric imino-boronate esters which are identified by the well-resolved diastereotopic peaks with significant chemical shift differences ranging up to 0.6 and 2.1 ppm in their corresponding (1)H and (19)F NMR spectra, without any racemization or kinetic resolution, thereby enabling the determination of enantiopurity. A protocol has also been developed for discrimination of chiral alpha-methyl amines, using optically pure trans-1,2-cyclohexanedicarboxylic acid in combination with 2-formylphenylboronic acid or 3-fluoro-2-fluoromethylboronic acid. The proposed strategies have been demonstrated on large number of chiral diacids and chiral alpha-methyl amines.
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Affiliation(s)
- Sachin R Chaudhari
- NMR Research Center and Solid State and Structural Chemistry Unit Indian Institute of Science, Bangalore-560012, India
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12
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Seco JM, Quiñoá E, Riguera R. Assignment of the Absolute Configuration of Polyfunctional Compounds by NMR Using Chiral Derivatizing Agents. Chem Rev 2012; 112:4603-41. [DOI: 10.1021/cr2003344] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- J. M. Seco
- Department of Organic
Chemistry and Center for Research in Biological
Chemistry and Molecular Materials (CIQUS), University of Santiago
de Compostela, E-15782 Santiago de Compostela, Spain
| | - E. Quiñoá
- Department of Organic
Chemistry and Center for Research in Biological
Chemistry and Molecular Materials (CIQUS), University of Santiago
de Compostela, E-15782 Santiago de Compostela, Spain
| | - R. Riguera
- Department of Organic
Chemistry and Center for Research in Biological
Chemistry and Molecular Materials (CIQUS), University of Santiago
de Compostela, E-15782 Santiago de Compostela, Spain
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13
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Ghiviriga I. Selective Excitation 1D-NMR Experiments for the Assignment of the Absolute Configuration of Secondary Alcohols. J Org Chem 2012; 77:3978-85. [DOI: 10.1021/jo3003375] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ion Ghiviriga
- Chemistry Department, University of Florida, Gainesville, Florida 32611-7200,
United States
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14
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Louzao I, Seco JM, Quiñoá E, Riguera R. The Use of a Single Derivative in the Configurational Assignment of Ketone Cyanohydrins. European J Org Chem 2010. [DOI: 10.1002/ejoc.201001107] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Murai T, Tsuji H, Imaizumi S, Maruyama T. Assignment of the Absolute Configurations of 1-Aryl-2-propanols with the Use of Phosphoroselenoyl Chlorides as Chiral Derivatizing Agents. CHEM LETT 2010. [DOI: 10.1246/cl.2010.524] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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Shim YJ, Choi K. Cyclic Ketals of Tartaric Acid: Simple and Tunable Reagents for the Determination of the Absolute Configuration of Primary Amines. Org Lett 2010; 12:880-2. [DOI: 10.1021/ol902942k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- You-Jin Shim
- Department of Chemistry, Korea University, Seoul 136-701, Republic of Korea
| | - Kihang Choi
- Department of Chemistry, Korea University, Seoul 136-701, Republic of Korea
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17
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Orlov NV, Ananikov VP. First principles design of derivatizing agent for direct determination of enantiomeric purity of chiral alcohols and amines by NMR spectroscopy. Chem Commun (Camb) 2010; 46:3212-4. [DOI: 10.1039/b923359h] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Freire F, Lallana E, Quiñoá E, Riguera R. The Stereochemistry of 1,2,3-Triols Revealed by1H NMR Spectroscopy: Principles and Applications. Chemistry 2009; 15:11963-75. [DOI: 10.1002/chem.200901505] [Citation(s) in RCA: 18] [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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19
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Vera B, Rodríguez AD, Avilés E, Ishikawa Y. Aplysqualenols A and B: Squalene-Derived Polyethers with Antitumoral and Antiviral Activity from the Caribbean Sea Slug Aplysia dactylomela.. European J Org Chem 2009; 2009:5327-5336. [PMID: 23459021 DOI: 10.1002/ejoc.200900775] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The novel bromotriterpene polyethers aplysqualenol A (1) and aplysqualenol B (2) have been isolated from the Caribbean sea slug Aplysia dactylomela collected in Puerto Rico, and their structures and relative configurational assignments established from spectroscopic data aided by quantum mechanical calculations of NMR chemical shifts. Although both these compounds may be conceived as polyoxycyclic derivatives of the C30 squalene skeleton, remarkably 1 and 2 possess an unprecedented C15 to C24 flexible chain of 14S* spatial disposition that contains a unique ether bridge between C16 and C19. Biological activity screening tests revealed that, although aplysqualenol A (1) does not have significant anti-infective properties, it possesses potent antitumoral and antiviral activities.
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Affiliation(s)
- Brunilda Vera
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U. P. R. Station, San Juan
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20
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Błażewska KM, Gajda T. Assignment of the absolute configuration of hydroxy- and aminophosphonates by NMR spectroscopy. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.05.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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The novel macrocyclic compounds as chiral solvating agents for determination of enantiomeric excess of carboxylic acids. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.06.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Porto S, Seco JM, Espinosa JF, Quiñoá E, Riguera R. Resin-Bound Chiral Derivatizing Agents for Assignment of Configuration by NMR Spectroscopy. J Org Chem 2008; 73:5714-22. [DOI: 10.1021/jo800469c] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Silvia Porto
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain, Centro de Investigación Lilly, Avda de la Industria 30, 28108, Alcobendas, Madrid, Spain
| | - José Manuel Seco
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain, Centro de Investigación Lilly, Avda de la Industria 30, 28108, Alcobendas, Madrid, Spain
| | - Juan Félix Espinosa
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain, Centro de Investigación Lilly, Avda de la Industria 30, 28108, Alcobendas, Madrid, Spain
| | - Emilio Quiñoá
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain, Centro de Investigación Lilly, Avda de la Industria 30, 28108, Alcobendas, Madrid, Spain
| | - Ricardo Riguera
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain, Centro de Investigación Lilly, Avda de la Industria 30, 28108, Alcobendas, Madrid, Spain
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Gao J, Haas H, Wang KY, Chen Z, Breitenstein W, Rajan S. The use of MPA amide for the assignment of absolute configuration of a sterically hindered cyclic secondary amine by 'mix and shake' NMR method. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:17-22. [PMID: 18098224 DOI: 10.1002/mrc.2115] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We present here a new method using methoxyphenylacetic acid (MPA) as the chiral derivatizing agent (CDA) for the assignment of absolute configuration of cyclic secondary amines. The MPA amides were prepared using the purification-free 'mix and shake' method. A detailed conformational analysis for the two diastereomeric amides was conducted by 2D NMR experiments and molecular mechanics calculations. We have established that, in the most stable conformation of each syn rotamer of MPA amides, the H-alpha in the MPA moiety is oriented toward the bulky substituent group at the asymmetric carbon in the chiral amine, presumably to avoid steric and/or electrostatic interactions. The observed NMR data were correlated with the conformational model to allow unambiguous assignment of absolute configuration of secondary amines. The results demonstrate that the MPA can be used as a useful CDA in the case of sterically crowded cyclic secondary amines from which the MTPA amides are usually difficult to make.
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Affiliation(s)
- Jinhai Gao
- Discovery Technologies, Novartis Institutes for Biomedical Research, Inc, Cambridge, MA 02139, USA
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24
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Pham VC, Jossang A, Sévenet T, Nguyen VH, Bodo B. Absolute Configuration of Myrobotinol, New Fused-Hexacyclic Alkaloid Skeleton from Myrioneuron nutans. J Org Chem 2007; 72:9826-9. [DOI: 10.1021/jo7017203] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Van Cuong Pham
- Laboratoire de Chimie et Biochimie des Substances Naturelles-CNRS, Muséum National d'Histoire Naturelle, 63 rue Buffon, 75005 Paris, France, Institut de Chimie des Substances Naturelles, CNRS-91198 Gif-sur-Yvette cedex, France, and Institute of Chemistry−Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet road, Hanoi, Vietnam ;
| | - Akino Jossang
- Laboratoire de Chimie et Biochimie des Substances Naturelles-CNRS, Muséum National d'Histoire Naturelle, 63 rue Buffon, 75005 Paris, France, Institut de Chimie des Substances Naturelles, CNRS-91198 Gif-sur-Yvette cedex, France, and Institute of Chemistry−Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet road, Hanoi, Vietnam ;
| | - Thierry Sévenet
- Laboratoire de Chimie et Biochimie des Substances Naturelles-CNRS, Muséum National d'Histoire Naturelle, 63 rue Buffon, 75005 Paris, France, Institut de Chimie des Substances Naturelles, CNRS-91198 Gif-sur-Yvette cedex, France, and Institute of Chemistry−Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet road, Hanoi, Vietnam ;
| | - Van Hung Nguyen
- Laboratoire de Chimie et Biochimie des Substances Naturelles-CNRS, Muséum National d'Histoire Naturelle, 63 rue Buffon, 75005 Paris, France, Institut de Chimie des Substances Naturelles, CNRS-91198 Gif-sur-Yvette cedex, France, and Institute of Chemistry−Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet road, Hanoi, Vietnam ;
| | - Bernard Bodo
- Laboratoire de Chimie et Biochimie des Substances Naturelles-CNRS, Muséum National d'Histoire Naturelle, 63 rue Buffon, 75005 Paris, France, Institut de Chimie des Substances Naturelles, CNRS-91198 Gif-sur-Yvette cedex, France, and Institute of Chemistry−Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet road, Hanoi, Vietnam ;
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25
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Ahn HC, Choi K. N-(2-Nitrophenyl)proline: An Intramolecular Hydrogen Bond Forming Reagent for the Determination of the Absolute Configuration of Primary Amines. Org Lett 2007; 9:3853-5. [PMID: 17711292 DOI: 10.1021/ol7017455] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
N-(2-Nitrophenyl)proline (2-NPP) amides of primary amines have a conformational preference for intramolecular hydrogen bonding. Because of the strong and selective anisotropic effects on the amine substituents, the absolute configuration of alpha-chiral primary amines can be assigned by comparing the 1H chemical shifts of diastereomeric 2-NPP amides.
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Affiliation(s)
- Hee Choon Ahn
- Department of Chemistry and Center for Electro- and Photo-Responsive Molecules, Korea University, Seoul 136-701, Republic of Korea
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26
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Freire F, Calderón F, Seco JM, Fernandez-Mayoralas A, Quiñoá E, Riguera R. Relative and Absolute Stereochemistry of Secondary/Secondary Diols: Low-Temperature 1H NMR of Their bis-MPA Esters. J Org Chem 2007; 72:2297-301. [PMID: 17343414 DOI: 10.1021/jo061939r] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Comparison of the room- and low-temperature 1H NMR spectra of the bis-(R)- or bis-(S)-MPA ester derivative of an open chain sec,sec-1,2-diol allows the easy determination of its relative stereochemistry and in some cases absolute configuration. If the diol is anti, its absolute configuration can be directly deduced from the signs of DeltadeltaT1T2 for substituents R1/R2, but if the relative stereochemistry of the diol is syn, the assignment of its absolute configuration requires the preparation of two derivatives (both the bis-(R)- and bis-(S)-MPA esters), comparison of their room-temperature 1H NMR spectra, and calculation of the DeltadeltaRS signs for the methines Halpha(R1) and Halpha(R2) and R1/R2 protons. The reliability of these correlations is validated with 17 diols of known absolute configuration used as model compounds.
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Affiliation(s)
- Félix Freire
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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27
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Rojas-Cabrera H, Fernández-Zertuche M, García-Barradas O, Muñoz-Muñiz O, Ordóñez M. Preparation of dimethyl (R)- and (S)-2-(2-hydroxyphenyl)-2-hydroxyethylphosphonate derived from salicylaldehyde via resolution using (S)-methoxyphenylacetic acid (MPA). ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2006.12.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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McConnell O, Bach A, Balibar C, Byrne N, Cai Y, Carter G, Chlenov M, Di L, Fan K, Goljer I, He Y, Herold D, Kagan M, Kerns E, Koehn F, Kraml C, Marathias V, Marquez B, McDonald L, Nogle L, Petucci C, Schlingmann G, Tawa G, Tischler M, Williamson RT, Sutherland A, Watts W, Young M, Zhang MY, Zhang Y, Zhou D, Ho D. Enantiomeric separation and determination of absolute stereochemistry of asymmetric molecules in drug discovery—Building chiral technology toolboxes. Chirality 2007; 19:658-82. [PMID: 17390370 DOI: 10.1002/chir.20399] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The application of Chiral Technology, or the (extensive) use of techniques or tools for the determination of absolute stereochemistry and the enantiomeric or chiral separation of racemic small molecule potential lead compounds, has been critical to successfully discovering and developing chiral drugs in the pharmaceutical industry. This has been due to the rapid increase over the past 10-15 years in potential drug candidates containing one or more asymmetric centers. Based on the experiences of one pharmaceutical company, a summary of the establishment of a Chiral Technology toolbox, including the implementation of known tools as well as the design, development, and implementation of new Chiral Technology tools, is provided.
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Affiliation(s)
- Oliver McConnell
- Wyeth Research, Chemical and Screening Sciences, Collegeville, PA 19426, USA.
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29
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Determination of absolute configuration of secondary alcohols using new chiral auxiliary and chemical shift calculation. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.01.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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García R, Seco JM, Vázquez SA, Quiñoá E, Riguera R. Role of Barium(II) in the Determination of the Absolute Configuration of Chiral Amines by 1H NMR Spectroscopy. J Org Chem 2006; 71:1119-30. [PMID: 16438530 DOI: 10.1021/jo0522207] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The assignment of the absolute configuration of alpha-chiral primary amines by complexation of their MPA derivatives with Ba2+ and NMR analysis of the changes generated is presented. All that is required is (a) the derivatization of the amine of unknown configuration with one enantiomer of the auxiliary reagent (MPA), either (R) or (S)-alpha-methoxyphenylacetic acid, (b) the recording of the 1H NMR spectrum of the resulting amide in MeCN-d3, (c) the addition of Ba(ClO4)2 to the NMR tube, and (d) the recording of a second spectrum after a few minutes of shaking. The above steps take a few minutes and are followed by an analysis of the shifts (measured as Deltadelta(Ba)) produced on the L1 and L2 substituents of the amine by the addition of Ba2+ and their comparison with those expected from the conformational changes produced by the complexation. The conformational changes initiated by complexation have been subjected to NMR and CD studies, which showed that the formation of the complex shifts the equilibrium from an antiperiplanar (AP) to a synperiplanar (SP) form, leading to an increase of the shielding by the phenyl group of MPA of the substituent of the amine located on the same side. In addition, theoretical calculations [density functional theory (DFT)] provide further support for the formation, structure, and stability of the complexes. The general applicability of this method and the trustworthiness of the resulting configurational assignment were guaranteed with a series of amines of known absolute configuration and varied structures, used as test compounds. The method proposed is simple, fast, and inexpensive, and it requires a very small amount of sample, only one derivatization, and the recording of just two 1H NMR spectra at room temperature. A graphical guide to simplify the application of this method is included.
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Affiliation(s)
- Rosa García
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
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31
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Dondoni A, Massi A, Sabbatini S. Multiple Component Approaches to C-Glycosyl β-Amino Acids by Complementary One-Pot Mannich-Type and Reformatsky-Type Reactions. Chemistry 2005; 11:7110-25. [PMID: 16224807 DOI: 10.1002/chem.200500823] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The development of new methods for the preparation of C-glycosyl beta-amino acid libraries with chemical and stereochemical diversity levels was investigated and the results are described herein. Two complementary one-pot three-component Mannich-type and Reformatsky-type synthetic strategies have been developed for the construction of chiral 3-amino propanoate fragments (eventually bis-substituted at C-2) directly linked to the anomeric carbon of pyranose and furanose residues. Both methods involved as the initial step the coupling of a sugar aldehyde to p-methoxybenzylamine but differed in the nucleophile (a d(2) synthon equivalent) which was successively added: a ketene silyl acetal (Mannich route) or a bromozinc enolate (Reformatsky route). Individual C-glycosyl beta-amino esters were isolated as single 3R diastereoisomers in fair to excellent yield (60-90%) and their structure assigned by NMR spectroscopy (Riguera protocol) supported by X-ray crystallography. A tentative explanation of the observed stereochemical outcome based on transition-state models is provided. A preliminary study on the synthesis of alpha,alpha-difluoro C-glycosyl beta-amino acids via a more traditional Reformatsky route is also reported.
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Affiliation(s)
- Alessandro Dondoni
- Laboratorio di Chimica Organica, Dipartimento di Chimica, Università di Ferrara, Via L. Borsari 46, 44100 Ferrara, Italy.
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Freire F, Seco JM, Quiñoá E, Riguera R. The Assignment of the Absolute Configuration of 1,2-Diols by Low-Temperature NMR of a Single MPA Derivative. Org Lett 2005; 7:4855-8. [PMID: 16235906 DOI: 10.1021/ol051764s] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The absolute configuration of 1,2-primary/secondary diols can be easily assigned by low-temperature NMR of a bis-MPA ester derivative. The assignment requires the analysis of just the methylene protons, is not limited by the absence of signals from the R group of the diol, and requires a very small and recoverable sample.
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Affiliation(s)
- Félix Freire
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, Spain
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33
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Freire F, Seco JM, Quiñoá E, Riguera R. The Prediction of the Absolute Stereochemistry of Primary and Secondary 1,2-Diols by1H NMR Spectroscopy: Principles and Applications. Chemistry 2005; 11:5509-22. [PMID: 16028300 DOI: 10.1002/chem.200500181] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The absolute configuration of 1,2-diols formed by a primary and a secondary (chiral) hydroxyl group can be deduced by comparison of the 1H NMR spectra of the corresponding (R)- and bis-(S)-MPA esters (MPA = methoxyphenylacetic acid). This method involves the use of the chemical shifts of substituents L1/L2 attached to the secondary (chiral) carbon, and of the hydrogen atom linked to the chiral center (C alpha-H) as diagnostic signals. Theoretical (AM1, HF, and B3 LYP calculations) and experimental data (dynamic and low-temperature NMR spectroscopy, studies on deuterated derivatives, constant coupling analysis, circular dichroism (CD) spectra, and NMR studies with a number of diols of known absolute configuration) prove that the signs of the delta delta(RS) obtained for those signals correlate with the absolute configuration of the diol. A graphical model for the reliable assignment of the absolute configuration of a 1,2-diol by comparison of the NMR spectra of its bis-(R)- and bis-(S)-MPA esters is presented.
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Affiliation(s)
- Félix Freire
- Departamento de Química Orgánica and Unidad de NMR de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
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34
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Freire F, Seco JM, Quiñoá E, Riguera R. Determining the absolute stereochemistry of secondary/secondary diols by 1H NMR: basis and applications. J Org Chem 2005; 70:3778-90. [PMID: 15876061 DOI: 10.1021/jo048643a] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[structures: see text] The absolute configuration of 1,2-, 1,3-, 1,4-, and 1,5-diols formed by two secondary (chiral) hydroxy groups can be deduced by comparison of the NMR spectra of the corresponding bis-(R)- and bis-(S)-MPA esters. The correlation between the NMR spectra of the bis-ester derivatives and the absolute stereochemistry of the diol involves the comparison of the chemical shifts of the signals for substituents R1/R2 and for the hydrogens attached to the two chiral centers [H(alpha)(R1) and H(alpha)(R2)] in the bis-(R)- and the bis-(S)-ester and is expressed as delta deltaRS. Theoretical calculations [energy minimization by semiempirical (AM1), ab initio (HF), DFT (B3LYP), and Onsager methods, and aromatic shielding effect calculations] and experimental data (NMR and CD spectroscopy) indicate that in these bis-MPA esters, the experimental delta deltaRS values are the result of the contribution of the shielding/deshielding effects produced by the two MPA units that combine according to the actual stereochemistry of the diol. The reliability of these correlations is demonstrated with a wide range of diols of known absolute configuration derivatized with MPA and 9-AMA as auxiliary reagents. A simple graphical model that allows the simultaneous assignment of the two asymmetric carbons of a 1,n-diol by comparison of the NMR spectra (delta deltaRS signs) of its bis-(R)- and bis-(S)-AMAA ester derivatives is presented.
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Affiliation(s)
- Félix Freire
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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35
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Mülhaupt T, Kaspar H, Otto S, Reichert M, Bringmann G, Lindel T. Isolation, Structural Elucidation, and Synthesis of Curcutetraol. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400336] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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Yang Y, Kayser MM, Hooper D. Assignment of absolute configuration of 3-hydroxy ?-lactams by the NMR ?mix and shake? method. Chirality 2005; 17:131-4. [PMID: 15704195 DOI: 10.1002/chir.20125] [Citation(s) in RCA: 12] [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
The absolute configurations of several 3-hydroxy beta-lactams were assigned by the NMR "mix and shake" methodology developed by Riguera and co-workers. The results from the NMR study correlated perfectly with the absolute configurations obtained from X-ray crystallographic structure analyses and chiral-phase HPLC data.
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Affiliation(s)
- Yan Yang
- Department of Physical Sciences, University of New Brunswick, Saint John, NB, Canada
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37
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Abstract
Functionalized "designer" polymers derived from ring-opening metathesis polymerization (ROMPgels) are attractive for their high loading, high purity, and ease of synthesis. Their physical state may vary from liquid to gel to granular solid, making a general method of handling these polymers difficult. By incorporating a suitable norbornene-substituted linker on standard Wang beads, ROMPgels can be easily grafted onto the resin, adding the convenience of a bead format while still maintaining the high loading and excellent site accessibility. This advantage is demonstrated by the use of an N-hydroxysuccinimide ROMPgel (3.3 mmol g(-1), a 3-fold increase from the parent linker resin) in IRORI Kan format. Conditions for the acylation of these IRORI-formatted ROMPgels are reported, along with the scope and limitations of the choice of acylating reagents. Yields are greatly improved by the use of perfluorinated solvents as a nonparticipating cosolvent in the acylation process. A simple titration method for the quantification of the acylated ROMPgels is also reported. Spent Kans are regenerated after each use without apparent loss of activity or purity after several cycles. Due to the high loading and reduced swelling of the ROMPgel resin, up to 0.39 mmol acyl group has successfully been recovered from a single IRORI miniKan, demonstrating the high capacity of the resin and applicability to both lead discovery and optimization programs.
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38
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Boc–phenylglycine: a chiral solvating agent for the assignment of the absolute configuration of amino alcohols and their ethers by NMR. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.04.032] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Herath KB, Jayasuriya H, Bills GF, Polishook JD, Dombrowski AW, Guan Z, Felock PJ, Hazuda DJ, Singh SB. Isolation, structure, absolute stereochemistry, and HIV-1 integrase inhibitory activity of integrasone, a novel fungal polyketide. JOURNAL OF NATURAL PRODUCTS 2004; 67:872-874. [PMID: 15165153 DOI: 10.1021/np0340504] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
HIV-1 integrase is a critical enzyme for replication of HIV, and its inhibition is one of the most promising new drug targets for anti-retroviral therapy with potentially significant advantages over existing therapies. In this Note, the isolation, structure elucidation, and absolute stereochemistry of integrasone, a novel polyketide, derived from an unidentified sterile mycelium have been described. This bicyclic dihydroxy epoxide lactone inhibited the strand transfer reaction of HIV-1 integrase with an IC(50) of 41 microM.
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Affiliation(s)
- Kithsiri B Herath
- Natural Products Chemistry, Merck Research Laboratories, PO Box 2000, Rahway, New Jersey 07065, USA
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40
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González-Morales A, Dı́az-Coutiño D, Fernández-Zertuche M, Garcı́a-Barradas O, Ordóñez M. Preparation of dimethyl (R)- and (S)-2-(2-aminophenyl)-2-hydroxyethylphosphonate from anthranilic acid. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2003.11.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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41
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Affiliation(s)
- José Manuel Seco
- Departamento de Química Orgánica and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
| | - Emilio Quiñoá
- Departamento de Química Orgánica and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
| | - Ricardo Riguera
- Departamento de Química Orgánica and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
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