1
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Structural Basis for Activation of the Heterodimeric GABAB Receptor. J Mol Biol 2020; 432:5966-5984. [DOI: 10.1016/j.jmb.2020.09.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 09/11/2020] [Accepted: 09/29/2020] [Indexed: 12/18/2022]
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2
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Martínez-Campos Z, Pastor N, Pineda-Urbina K, Gómez-Sandoval Z, Fernández-Zertuche M, Razo-Hernández RS. In silico structure-based design of GABA B receptor agonists using a combination of docking and QSAR. Chem Biol Drug Des 2019; 94:1782-1798. [PMID: 31207116 DOI: 10.1111/cbdd.13580] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/29/2019] [Accepted: 06/02/2019] [Indexed: 12/27/2022]
Abstract
The study of γ-aminobutyric acid B receptor (GABAB ) activation is of great interest for several brain disorders. The search of new GABAB receptor agonists has been carried out by many research groups. As a result, Baclofen has become the prototypical GABAB receptor agonist. However, several attempts have been made to modify its structure to generate derivatives with improved activity. In this work, we carried out a theoretical and computational study for a wide range of GABAB receptor agonists reported in the literature. Molecular docking and QSAR techniques were combined by using the interaction energies of the agonists with the key residues of GABAB receptor, as molecular descriptors for the QSAR construction. The resulting mathematical model suggests that the activity of GABAB receptor agonists is influenced by three factors: their shape and molecular size (PW5 and PJI2), their constitutional features (ELUMO and T(N…O)) and the energy interaction with GABAB receptor (ETRP278 ). This model was validated by the QUIK, REDUNDANCY and OVERFITTING rules, and its predicted ability was tasted by the QLOO , QASYM , R 0 2 and r m 2 rules. Finally, six new compounds are proposed (35-40) with high potential to be used as GABAB receptor agonists.
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Affiliation(s)
- Zuleyma Martínez-Campos
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
| | - Nina Pastor
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigación en Dinámica Celular, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
| | | | | | - Mario Fernández-Zertuche
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
| | - Rodrigo Said Razo-Hernández
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigación en Dinámica Celular, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
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Zhong Y, Hong S, Cai Z, Ma S, Jiang X. Direct β-selectivity of α,β-unsaturated γ-butyrolactam for asymmetric conjugate additions in an organocatalytic manner. RSC Adv 2018; 8:28874-28878. [PMID: 35548007 PMCID: PMC9084493 DOI: 10.1039/c8ra05264f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 07/05/2018] [Indexed: 01/06/2023] Open
Abstract
The β-selective asymmetric addition of γ-butyrolactam with cyclic imino esters catalyzed by a bifunctional chiral tertiary amine has been developed, which provides an efficient access to optically active β-position functionalized pyrrolidin-2-one derivatives in both high yield and enantioselectivity (up to 78% yield and 95 : 5 er). This is the first catalytic method to access chiral β-functionalized pyrrolidin-2-one via a direct organocatalytic approach. The asymmetric addition of γ-butyrolactam with cyclic imino esters catalyzed by (DHQD)2AQN has been developed, which provides an access to β-position functionalized pyrrolidin-2-one derivatives in high levels yield and enantioselectivity.![]()
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Affiliation(s)
- Yuan Zhong
- School of Pharmaceutical Sciences
- Sun Yat-Sen University
- Guangzhou
- China
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
| | - Sihua Hong
- School of Pharmaceutical Sciences
- Sun Yat-Sen University
- Guangzhou
- China
| | - Zhengjun Cai
- School of Pharmaceutical Sciences
- Sun Yat-Sen University
- Guangzhou
- China
| | - Shixiong Ma
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- School of Basic Medical Sciences
- Lanzhou University
- Lanzhou
- China
| | - Xianxing Jiang
- School of Pharmaceutical Sciences
- Sun Yat-Sen University
- Guangzhou
- China
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4
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Yan LJ, Wang HF, Chen WX, Tao Y, Jin KJ, Chen FE. Development of Bifunctional Thiourea Organocatalysts Derived from a Chloramphenicol Base Scaffold and their Use in the Enantioselective Alcoholysis ofmesoCyclic Anhydrides. ChemCatChem 2016. [DOI: 10.1002/cctc.201600228] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Lin-Jie Yan
- Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Hai-Feng Wang
- Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Wen-Xue Chen
- Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Yuan Tao
- Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Kai-Jun Jin
- Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
| | - Fen-Er Chen
- Department of Chemistry; Fudan University; Shanghai 200433 P.R. China
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5
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Enantioselective addition of aryl ketones and acetone to nitroalkenes organocatalyzed by carbamate-monoprotected cyclohexa-1,2-diamines. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.07.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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6
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Huang S, Mao J, Wei B, Pei G. The anti-spasticity drug baclofen alleviates collagen-induced arthritis and regulates dendritic cells. J Cell Physiol 2015; 230:1438-47. [PMID: 25556830 DOI: 10.1002/jcp.24884] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 12/05/2014] [Indexed: 12/27/2022]
Abstract
Baclofen is used clinically as a drug that treats spasticity, which is a syndrome characterized by excessive contraction of the muscles and hyperflexia in the central nervous system (CNS), by activating GABA(B) receptors (GABA(B)Rs). Baclofen was recently reported to desensitize chemokine receptors and to suppress inflammation through the activation of GABA(B)Rs. GABA(B)Rs are expressed in various immune cells, but the functions of these receptors in autoimmune diseases remain largely unknown. In this study, we investigated the effects of baclofen in murine collagen-induced arthritis (CIA). Oral administration of baclofen alleviated the clinical development of CIA, with a reduced number of IL-17-producing T helper 17 (T(H)17) cells. In addition, baclofen treatment suppressed dendritic cell (DC)-primed T(H)17 cell differentiation by reducing the production of IL-6 by DCs in vitro. Furthermore, the pharmacological and genetic blockade of GABA(B)Rs in DCs weakened the effects of baclofen, indicating that GABA(B)Rs are the molecular targets of baclofen on DCs. Thus, our findings revealed a potential role for baclofen in the treatment of CIA, as well as a previously unknown signaling pathway that regulates DC function.
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Affiliation(s)
- Shichao Huang
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, P. R. China
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7
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Naciuk FF, Vargas DZ, D'Oca CRM, Moro CC, Russowsky D. One pot domino reaction accessing γ-nitroesters: synthesis of GABA derivatives. NEW J CHEM 2015. [DOI: 10.1039/c4nj01552e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
γ-Nitroesters are synthesized by the one pot domino process. GABA derivatives phenibut and baclofen were readily accessed.
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Affiliation(s)
- Fabricio F. Naciuk
- Laboratório de Sínteses Orgânicas
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Debora Z. Vargas
- Laboratório de Sínteses Orgânicas
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Caroline R. M. D'Oca
- Laboratório de Sínteses Orgânicas
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Celso C. Moro
- Laboratório de Sólidos e Superfícies
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Dennis Russowsky
- Laboratório de Sínteses Orgânicas
- Instituto de Química
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
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8
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Miyazawa K, Koike T, Akita M. Hydroaminomethylation of Olefins with Aminomethyltrifluoroborate by Photoredox Catalysis. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400556] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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GABA(B)-agonistic activity of certain baclofen homologues. Molecules 2013; 18:10266-84. [PMID: 23973998 PMCID: PMC6270091 DOI: 10.3390/molecules180910266] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 08/13/2013] [Accepted: 08/15/2013] [Indexed: 11/17/2022] Open
Abstract
Baclofen (1) is a potent and selective agonist for bicuculline-insensitive GABA(B) receptors and is used clinically as an antispastic and muscle relaxant agent. In the search for new bioactive chemical entities that bind specifically to GABA(B) receptors, we report here the synthesis of certain baclofen homologues, namely (R,S)-5-amino-3-arylpentanoic acid hydrochlorides (R,S)-1a-h as well as (R,S)-5-amino-3-methylpentanoic acid [(RS)-1i] to be evaluated as GABA(B)R agonists. Compound 1a is an agonist to GABA(B) receptors with an EC₅₀ value of 46 μM on tsA201 cells transfected with GABA(B1b)/GABA(B2)/Gqz5, being the most active congener among all the synthesized compounds.
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10
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Biscinchona alkaloids as highly efficient bifunctional organocatalysts for the asymmetric conjugate addition of malonates to nitroalkenes at ambient temperature. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.08.070] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Petersen KS, Stoltz BM. Palladium-catalyzed, asymmetric Baeyer–Villiger oxidation of prochiral cyclobutanones with PHOX ligands. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.04.046] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Shao C, Yu HJ, Wu NY, Tian P, Wang R, Feng CG, Lin GQ. Asymmetric Synthesis of β-Substituted γ-Lactams via Rhodium/Diene-Catalyzed 1,4-Additions: Application to the Synthesis of (R)-Baclofen and (R)-Rolipram. Org Lett 2011; 13:788-91. [DOI: 10.1021/ol103054a] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cheng Shao
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular Biology, Lanzhou University, Lanzhou 730000, China
| | - Hong-Jie Yu
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular Biology, Lanzhou University, Lanzhou 730000, China
| | - Nuo-Yi Wu
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular Biology, Lanzhou University, Lanzhou 730000, China
| | - Ping Tian
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular Biology, Lanzhou University, Lanzhou 730000, China
| | - Rui Wang
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular Biology, Lanzhou University, Lanzhou 730000, China
| | - Chen-Guo Feng
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular Biology, Lanzhou University, Lanzhou 730000, China
| | - Guo-Qiang Lin
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular Biology, Lanzhou University, Lanzhou 730000, China
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13
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Doyle MP, Ratnikov M, Liu Y. Intramolecular catalytic asymmetric carbon–hydrogen insertion reactions. Synthetic advantages in total synthesis in comparison with alternative approaches. Org Biomol Chem 2011; 9:4007-16. [DOI: 10.1039/c0ob00698j] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Pirard B, Evrard G, Norberg B, Berthelot P, Vaccher C, Debaert M, Durant F. Crystal structure of 4-amino-3-(2-benzothiophen) butyric acid, a baclofen analogue. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19931021004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Ji L, Ma Y, Li J, Zhang L, Zhang L. An efficient synthesis of (R)- and (S)-baclofen via desymmetrization. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.08.079] [Citation(s) in RCA: 22] [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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16
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Radiochemical 18F-fluoroarylation of unsaturated α-, β- and γ-amino acids, application to a radiolabelled analogue of baclofen. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.07.117] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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5-(4-Chlorophenyl)-5,6-dihydro-1,3-oxazepin-7(4H)-one derivatives as lipophilic cyclic analogues of baclofen: Design, synthesis, and neuropharmacological evaluation. Bioorg Med Chem 2008; 16:7983-91. [DOI: 10.1016/j.bmc.2008.07.064] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2008] [Revised: 07/22/2008] [Accepted: 07/23/2008] [Indexed: 11/23/2022]
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18
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El-Batta A, Jiang C, Zhao W, Anness R, Cooksy AL, Bergdahl M. Wittig Reactions in Water Media Employing Stabilized Ylides with Aldehydes. Synthesis of α,β-Unsaturated Esters from Mixing Aldehydes, α-Bromoesters, and Ph3P in Aqueous NaHCO3. J Org Chem 2007; 72:5244-59. [PMID: 17559278 DOI: 10.1021/jo070665k] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Water is demonstrated to be an effective medium for the Wittig reaction over a wide range of stabilized ylides and aldehydes. Despite sometimes poor solubility of the reactants, good chemical yields normally ranging from 80 to 98% and high E-selectivities (up to 99%) are achieved, and the rate of the reactions in water is unexpectedly accelerated. The efficiency of water as a medium in the Wittig reaction is compared to conventional organic solvents ranging from carbon tetrachloride to methanol. The aqueous Wittig reaction works best when large hydrophobic entities are present, such as aromatic, heterocyclic aromatic carboxaldehydes, and long-chain aliphatic aldehydes with triphenylphosphoranes. The E/Z-isomeric ratio of the Wittig products appears dependent on the electron-accepting/donating capacity and the location of the substituents present in the aromatic ring. The effect of additives, such as benzoic acid, LiCl, and sodium dodecyl sulfate (SDS), on the Wittig reaction has been explored. The Wittig reaction can also be conducted in the presence of acidic entities, such as phenols and carboxylic acids. In addition, large alpha-substituents in the aliphatic aldehydes do not jeopardize the reaction. It is also demonstrated that hydrates of aldehydes can be used directly in the aqueous Wittig reaction as substrates. The scope of the aqueous Wittig reaction is extended to 24 examples of one-pot mixtures of Ph3P, alpha-bromoesters, and aldehydes in sodium bicarbonate solution (at 20 degrees C for 40 min to 3 h) to provide Wittig products of up to 99% yield and up to 98% E-selectivity. Since water is inexpensive, extremely easy to handle, and represents no environmental concerns, it should be considered a possible medium for new organic reactions.
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Affiliation(s)
- Amer El-Batta
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, USA
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19
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Vaccher C, Berthelot P, Flouquet N, Vaccher MP, Debaert M. Bromination of α-Methylstyrenes with N-Bromosuccinimide in Chlorobenzene One-Pot and Selective Preparation of 1,3-Dibromo-2-phenylprop-1-enes. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397919308009826] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Claude Vaccher
- a Laboratoire de Pharmacie Chimique , Faculté de Pharmacie - BP 83 rue du Pr. Laguesse, 59O06, LILLE CEDEX, FRANCE
| | - Pascal Berthelot
- a Laboratoire de Pharmacie Chimique , Faculté de Pharmacie - BP 83 rue du Pr. Laguesse, 59O06, LILLE CEDEX, FRANCE
| | - Nathalie Flouquet
- a Laboratoire de Pharmacie Chimique , Faculté de Pharmacie - BP 83 rue du Pr. Laguesse, 59O06, LILLE CEDEX, FRANCE
| | - Marie-Pierre Vaccher
- a Laboratoire de Pharmacie Chimique , Faculté de Pharmacie - BP 83 rue du Pr. Laguesse, 59O06, LILLE CEDEX, FRANCE
| | - Michel Debaert
- a Laboratoire de Pharmacie Chimique , Faculté de Pharmacie - BP 83 rue du Pr. Laguesse, 59O06, LILLE CEDEX, FRANCE
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20
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Muller T, Vaccher C, Vaccher MP, Flouquet N. A New Process for Preparing Dibromides by Decarboxylation of Unsaturated Acids with NBS. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397919808004287] [Citation(s) in RCA: 1] [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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21
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Vaccher MP, Bonte JP, Vaccher C. Capillary Electrophoretic Resolution of Enantiomers of Aromatic Amino-Acids with Highly Sulfated α-, β- and γ-Cyclodextrins. Chromatographia 2006. [DOI: 10.1365/s10337-006-0838-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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22
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Co-catalyzed reductive cyclization of azido and cyano substituted α,β-unsaturated esters with NaBH4: enantioselective synthesis of (R)-baclofen and (R)-rolipram. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.03.017] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Okino T, Hoashi Y, Furukawa T, Xu X, Takemoto Y. Enantio- and Diastereoselective Michael Reaction of 1,3-Dicarbonyl Compounds to Nitroolefins Catalyzed by a Bifunctional Thiourea. J Am Chem Soc 2005; 127:119-25. [PMID: 15631461 DOI: 10.1021/ja044370p] [Citation(s) in RCA: 893] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We synthesized a new class of bifunctional catalysts bearing a thiourea moiety and an amino group on a chiral scaffold. Among them, thiourea 1e bearing 3,5-bis(trifluoromethyl)benzene and dimethylamino groups was revealed to be highly efficient for the asymmetric Michael reaction of 1,3-dicarbonyl compounds to nitroolefins. Furthermore, we have developed a new synthetic route for (R)-(-)-baclofen and a chiral quaternary carbon center with high enantioselectivity by Michael reaction. In these reactions, we assumed that a thiourea moiety and an amino group of the catalyst activates a nitroolefin and a 1,3-dicarbonyl compound, respectively, to afford the Michael adduct with high enantio- and diastereoselectivity.
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Affiliation(s)
- Tomotaka Okino
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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25
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Thiemann T, Watanabe M, Tanaka Y, Mataka S. Solvent-free Wittig olefination with stabilized phosphoranes—scope and limitations. NEW J CHEM 2004. [DOI: 10.1039/b311894k] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Chang MY, Sun PP, Chen ST, Chang NC. A facile synthesis of 3-aryl pyroglutamic acid. Facile synthesis of baclofen and chlorpheg. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)01278-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Ogasawara K, Hayashi M. A Diastereocontrolled Route to (R)-(-)- Baclofen Using a Cyclopentanoid Chiral Building Block. HETEROCYCLES 2003. [DOI: 10.3987/com-02-s73] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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28
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Doyle MP, Hu W. Enantioselective carbon-hydrogen insertion is an effective and efficient methodology for the synthesis of (R)-(-)-baclofen. Chirality 2002; 14:169-72. [PMID: 11835561 DOI: 10.1002/chir.10060] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A highly enantioselective methodology for the synthesis of the GABA(B) receptor agonist (R)-(-)-baclofen is described. This synthesis begins with p-chlorophenethyl alcohol and involves a catalytic carbon-hydrogen insertion reaction of a chiral dirhodium(II) carboxamidate with the corresponding diazoacetate (81% yield, 95% ee). Subsequent steps convert the intermediate gamma-lactone to (R)- (-)-baclofen in a 60% overall yield. The amount of catalyst required for the C-H insertion transformation is only 0.5 mol%.
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Affiliation(s)
- Michael P Doyle
- Department of Chemistry, University of Arizona, Tucson, Arizona, USA.
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29
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Simonelli F, Clososki GC, dos Santos AA, Oliveira AR, de A. Marques F, Zarbin PH. Oxazoline cuprate addition to nitroalkenes: a new route approaching γ-amino acids. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01576-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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30
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Costantino G, Macchiarulo A, Entrena Guadix A, Pellicciari R. QSAR and Molecular Modeling Studies of Baclofen Analogues as GABABAgonists. Insights into the Role of the Aromatic Moiety in GABABBinding and Activation. J Med Chem 2001; 44:1827-32. [PMID: 11356116 DOI: 10.1021/jm0100133] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An integrated QSAR/molecular modeling study is carried out on a series of baclofen analogues with the aim of addressing the role of their aromatic moiety in GABA(B) receptor binding and activation. The strong correlation found between electronic descriptors (HOMO and LUMO orbital energies) and the biological activity expressed as receptor binding is discussed also on the basis of available experimental mutagenesis data and of the results obtained from homology modeling of GABA(B) receptor. In particular, it can be inferred from the QSAR analysis that the ability of being involved in aromatic-aromatic pi interaction is the distinctive feature of the p-chlorophenyl moiety of baclofen. This conclusion is confirmed by homology modeling and docking studies which indicate that the p-chlorophenyl moiety of baclofen is disposed into a pocket formed by Tyr366 and Tyr395. These results are discussed in terms of mechanism of GABA(B) activation promoted by baclofen or GABA.
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Affiliation(s)
- G Costantino
- Dipartimento di Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, Via del Liceo 1, 06123 Perugia, Italy
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Vaccher C. SYNTHESIS OF 4-SUBSTITUTED-1,5-DIHYDRO-2H-PYRROL-2-ONES, POTENTIAL SYNTHONS FOR THE PREPARATION OF RADIOLABELED 3-SUBSTITUTED-γ-AMINO ACIDS. SYNTHETIC COMMUN 2001. [DOI: 10.1081/scc-100104059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Bräuner-Osborne H, Krogsgaard-Larsen P. Functional pharmacology of cloned heterodimeric GABAB receptors expressed in mammalian cells. Br J Pharmacol 1999; 128:1370-4. [PMID: 10602314 PMCID: PMC1571770 DOI: 10.1038/sj.bjp.0702914] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/1999] [Revised: 08/25/1999] [Accepted: 09/02/1999] [Indexed: 11/09/2022] Open
Abstract
1. In this study we report a new assay of heterodimeric gamma-amino-butanoic acid subtype B (GABAB) receptors where either GABABR1a or GABABR1b are co-expressed with GABABR2 and the chimeric G-protein Galphaq-z5 in tsA cells. In this manner we obtained a robust response to GABAB agonists measured as increase in phosphoinositide hydrolysis. 2. We used this assay to characterize a number of commonly used GABAB receptor ligands. Both splice variants displayed the same rank order of agonist potency; 3-aminopropyl(methyl)phosphinic acid (SKF-97541)>GABA>(R)-4-amino-3-(4-chlorophenyl)butanoic acid ((R)-baclofen)>(RS)-4-amino-3-(5-chloro-2-thienyl)butanoic acid (BCTG)>3-aminopropylphosphonic acid (3-APPA) and furthermore, the absolute agonist potency values were very close to each other. 3. 3-APPA was a partial agonist displaying maximal responses of 41 and 61% compared to GABA at GABABR1a and GABABR1b, respectively. The antagonist (RS)-3-amino-2-(4-chlorophenyl)-2-hydroxypropylsulphonic acid (2-OH-saclofen) displayed KB values of 15 and 7.8 microM at GABABR1a and GABABR1b, respectively. 4. The rank order of agonist potency as well as the absolute ligand potencies correspond very well with those previously reported in different tissues, and this study thus provides a functional assay of cloned GABAB receptors which should be a valuable tool for further characterization of GABAB ligands. Finally, we can conclude that the functional pharmacological profiles of the two GABABR1 splice variants are very similar.
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Affiliation(s)
- H Bräuner-Osborne
- NeuroScience PharmaBiotec Centre, Department of Medicinal Chemistry, The Royal Danish School of Pharmacy, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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Andersen KE, Sørensen JL, Huusfeldt PO, Knutsen LJ, Lau J, Lundt BF, Petersen H, Suzdak PD, Swedberg MD. Synthesis of novel GABA uptake inhibitors. 4. Bioisosteric transformation and successive optimization of known GABA uptake inhibitors leading to a series of potent anticonvulsant drug candidates. J Med Chem 1999; 42:4281-91. [PMID: 10543872 DOI: 10.1021/jm980492e] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By bioisosteric transformations and successive optimization of known GABA uptake inhibitors, several series of novel GABA uptake inhibitors have been prepared by different synthetic approaches. These compounds are derivatives of nipecotic acid and guvacine, substituted at the nitrogen of these amino acids by various lipophilic moieties such as diarylaminoalkoxyalkyl or diarylalkoxyalkyl. The in vitro values for inhibition of [(3)H]GABA uptake in rat synaptosomes was determined for each compound, and it was found that the most potent compound from this series, (R)-1-(2-(3,3-diphenyl-1-propyloxy)ethyl)-3-piperidinecarboxyli c acid hydrochloride (29), is so far the most potent parent compound inhibiting GABA uptake into synaptosomes. Structure-activity results confirm our earlier observations, that an electronegative center in the chain connecting the amino acid and diaryl moiety is very critical in order to obtain high in vitro potency. Several of the novel compounds were also evaluated for their ability in vivo to inhibit clonic seizures induced by a 15 mg/kg (ip) dose of methyl 6, 7-dimethoxy-4-ethyl-beta-carboline-3-carboxylate (DMCM). Some of the compounds tested show a high in vivo potency comparable with that of the recently launched anticonvulsant product 6 ((R)-1-(4, 4-bis(3-methyl-2-thienyl)-3-butenyl)-3-piperidinecarboxylic acid).
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Affiliation(s)
- K E Andersen
- Health Care Discovery, Novo Nordisk A/S, Novo Nordisk Park, DK 2760 Måløv, Denmark.
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Vaccher C, Vaccher MP, Bonte JP. Enantiomeric HPLC Separations of 4-Substituted-Pyrrolidin-2-Ones using Cellulose Based Chiral Stationary Phases. ANAL LETT 1999. [DOI: 10.1080/00032719908542838] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Smeyers NJ, Melendez FJ, Smeyers YG. Exploring potential energy hypersurfaces for triple symmetric inversion in 3-azabicyclo[3.3.1]nonan-9-one and itsN-methyl derivative. J Comput Chem 1998. [DOI: 10.1002/(sici)1096-987x(19981115)19:14<1567::aid-jcc2>3.0.co;2-h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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36
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Coelho F, de Azevedo MBM, Boschiero R, Resende P. A Simple and Efficient New Approach to the Total Synthesis of (±)-4-Amino-3-(4-Chlorophenyl)-Butyric Acid (BACLOFEN). SYNTHETIC COMMUN 1997. [DOI: 10.1080/00397919708004109] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Vaccher C, Vaccher MP, Bonte JP. Chiral resolution of 4-substituted pyrrolidin-2-ones using high-performance liquid chromatography on cellulose and amylose chiral stationary phases. J Chromatogr A 1997. [DOI: 10.1016/s0021-9673(96)01078-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pirard B, Durant F. Molecular modelling and conformational analysis of a GABAB antagonist. J Comput Aided Mol Des 1996; 10:31-40. [PMID: 8786413 DOI: 10.1007/bf00124463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Crystallographic database studies and molecular dynamics simulations in different media have enabled us to sample the conformational space of a GABAB antagonist. As a result, we have defined a pharmacophoric pattern for GABAB antagonists. This study has led us to compare the conformational preferences deduced from database studies and molecular dynamics simulations. The influence of the medium on the conformations has also been investigated.
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Affiliation(s)
- B Pirard
- Laboratoire de Chimie Moléculaire Structurale, Facultés, Universitaires Notre-Dame de la Paix, Namur, Belgium
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Ansar M, Al Akoum Ebriki S, Mouhoub R, Berthelot P, Vaccher C, Vaccher MP, Flouquet N, Caignard DH, Renard P, Pirard B, Rettori MC, Evrard G, Durant F, Debaert M. 3-Benzo[b]furyl- and 3-benzo[b]thienylaminobutyric acids as GABAB ligands. Synthesis and structure-activity relationship studies. Eur J Med Chem 1996. [DOI: 10.1016/0223-5234(96)85165-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Pirard B, Carrupt PA, Testa B, Tsai RS, Berthelot P, Vaccher C, Debaert M, Durant F. Structure-affinity relationships of baclofen and 3-heteroaromatic analogues. Bioorg Med Chem 1995; 3:1537-45. [PMID: 8634834 DOI: 10.1016/0968-0896(95)00144-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Substituting a furan, a thiophene, a benzo[b]furan, a benzo[b]thiophene, or a quinoline ring for the p-chlorophenyl moiety of baclofen has led to GABAB ligands with different affinities depending on the nature of the heteroaromatic ring, and on the nature and position of its substituent. As steric effects cannot account for all the affinity variations, we have studied the lipophilic and electronic properties of baclofen and selected 3-heteroaromatic analogues, gaining insight into the structural features necessary for GABAB affinity. Centrifugal partition chromatography (CPC) has been used to measure octan-1-ol water distribution coefficients, while ab initio molecular orbital (MO) calculations were performed to study electronic properties.
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Affiliation(s)
- B Pirard
- Laboratoire de Chimie Moléculaire Structurale, Facultés Universitaires Notre-Dame de la Paix, Namur, Belgium
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Vaccher C, Berthelot P, Debaert M. GABA-B agonists: enantiomeric resolution of 4-amino-3-(5-chlorothien-2-yl)butyric acid and analogues on chiral crown ether stationary phase. J Chromatogr A 1995. [DOI: 10.1016/0021-9673(95)00616-u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
GABAB receptors are a distinct subclass of receptors for the major inhibitory transmitter 4-aminobutanoic acid (GABA) that mediate depression of synaptic transmission and contribute to the inhibition controlling neuronal excitability. The development of specific agonists and antagonists for these receptors has led to a better understanding of their physiology and pharmacology, highlighting their diverse coupling to different intracellular effectors through Gi/G(o) proteins. This review emphasises our current knowledge of the neurophysiology and neurochemistry of GABAB receptors, including their heterogeneity, as well as the therapeutic potential of drugs acting at these sites.
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Affiliation(s)
- D I Kerr
- Department of Anaesthesia and Intensive Care, University of Adelaide, Australia
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Pirard B, Paquet B, Evrard G, Berthelot P, Vaccher C, Ansard M, Debaert M, Durant F. GABAB pharmacophoric pattern based on conformational analysis of 3-heteroaromatic baclofen analogues. Eur J Med Chem 1995. [DOI: 10.1016/0223-5234(96)88304-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Conformational distribution of baclofen analogues by 1H and 13C NMR analysis and ab initio HF MO STO-3G or STO-3G* calculations. J Mol Struct 1993. [DOI: 10.1016/0022-2860(93)80245-q] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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47
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Crystal structures of baclofen analogs: 3-thienyl- and 3-furylaminobutyric acids. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf01195730] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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48
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Lacey G, Berthelot P, Vaccher C, Flouquet N, Vaccher MP, Debaert M, Curtis DR. Thienyl-GABA derivatives as specific baclofen agonists in the rat and cat spinal cord in vivo. Neurosci Lett 1993; 159:64-6. [PMID: 8264980 DOI: 10.1016/0304-3940(93)90799-q] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The depression of the amplitude of extracellularly recorded monosynaptic excitatory field potentials in the lumbar spinal cord of pentobarbitone anaesthetised rats and cats by three thienyl derivatives of GABA: 4-amino-3-(2-thienyl)-butanoic acid; 4-amino-3-(2-thienyl-5-methyl)-butanoic acid and 4-amino-3-(2-thienyl-5-chloro)-butanoic acid was reversibly blocked by the (-)-baclofen antagonist 3-aminopropyl-diethoxymethyl-phosphinic acid (CGP 35348). These compounds, of which the most potent, the 5-chloro derivative, was weaker than (-)-baclofen, thus activate baclofen receptors in the cat and rat spinal cord.
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Affiliation(s)
- G Lacey
- Division of Neuroscience, John Curtin School of Medical Research, Canberra, ACT Australia
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Kerr DI, Ong J, Doolette DJ, Abbenante J, Prager RH. 3-amino-2-(4-chlorophenyl)-nitropropane is a new GABAB receptor agonist, more active peripherally. Eur J Pharmacol 1993; 236:239-45. [PMID: 8391459 DOI: 10.1016/0014-2999(93)90594-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The activity of the nitropropane analog of baclofen, 3-amino-2-(4-chlorophenyl)-nitropropane (N-BAC), has been examined at central and peripheral GABAB receptors. N-BAC was less potent than baclofen as a GABAB receptor agonist in depressing repetitive twitch contractions in the guinea-pig isolated ileum (IC50s for baclofen = 4.1 +/- 1.3 microM; N-BAC = 9.2 +/- 0.3 microM) and vas deferens (IC50s for baclofen = 30 microM; N-BAC = 100 microM), competitively antagonised by phaclofen, 2-hydroxysaclofen and CGP 35348 (3-aminopropyl-P-di-ethoxymethylphosphinic acid). In the ileum, the pA2 values for CGP 35348 with baclofen (4.7 +/- 0.2) and N-BAC (4.6 +/- 0.3) were not significantly different (P > 0.05), indicating that both agonists activate the same receptor type. By contrast, in rat neocortical slices, N-BAC was 20 times weaker than baclofen in attenuating spontaneous discharges, sensitive to CGP 35348, whilst it was 100 times less potent than baclofen in depressing evoked CA1 population spikes in the hippocampus. This new GABAB receptor agonist, N-BAC, is thus more active at peripheral than central GABAB receptors.
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Affiliation(s)
- D I Kerr
- Department of Anaesthesia and Intensive Care, University of Adelaide, South Australia
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Smeyers YG, Hernandez-Laguna A, Smeyers NJ, Arias-Perez M, Fernandez M. Exploring the potential energy hypersurfaces for the triple symmetric inversion in 3-azabicyclo[3.3.1]nonan-9-one and its N-methyl derivative. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0166-1280(93)85040-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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