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Rapp M, Margas-Musielak K, Kaczmarek P, Witkowska A, Cytlak T, Siodła T, Koroniak H. Highly Diastereoselective Construction of Carbon- Heteroatom Quaternary Stereogenic Centers in the Synthesis of Analogs of Bioactive Compounds: From Monofluorinated Epoxyalkylphosphonates to α-Fluoro-, β-, or γ-Amino Alcohol Derivatives of Alkylphosphonates. Front Chem 2021; 9:613633. [PMID: 34150715 PMCID: PMC8208234 DOI: 10.3389/fchem.2021.613633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 03/26/2021] [Indexed: 11/25/2022] Open
Abstract
The synthesis of the stable surrogates of an important amino acid (R)-4-amino-3-hydroxybutyric acid (GABOB) such as substituted hydroxy aminophosphonic acids bearing a quaternary stereogenic center is presented. Highly diastereoselective formations of fluorinated spiroepoxy alkylphosphonate or related tertiary carbon-containing oxiranes from β-keto phosphonates possessing methyl, phenyl, or cyclohexenyl substituents, are reported. Stereoselective acid-promoted epoxide opening by bromide or azide followed by reduction/protection afforded tertiary bromides or N-Boc derivatives of β-amino-γ-hydroxy alkylphosphonates in most cases, while the reactions of oxiranes with different amines yielded their β-hydroxy-γ-amino regioisomers. Surprisingly, during the synthesis of amino phosphonic acids, we observe that the acid-induced rearrangement proceeded in a high diastereospecific manner, leading finally to substituted β-hydroxy-γ-aminoalkylphosphonic acids.
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Affiliation(s)
- Magdalena Rapp
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Poznań, Poland
| | | | - Patrycja Kaczmarek
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Poznań, Poland
| | | | - Tomasz Cytlak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Poznań, Poland
- Centre for Advanced Technologies Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Tomasz Siodła
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Henryk Koroniak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Poznań, Poland
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Kolodiazhnyi OI. Advances in Asymmetric Hydrogenation and Hydride Reduction of Organophosphorus Compounds. PHOSPHORUS SULFUR 2014. [DOI: 10.1080/10426507.2014.905778] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Oleg I. Kolodiazhnyi
- Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Sciences of Ukraine, Murmanska Str., 1, Kiev, Ukraine
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Nesterov V, Kolodiazhnyi O. Efficient method for the asymmetric reduction of α- and β-ketophosphonates. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.04.101] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Frydenvang K, Kristiansen U, Frølund B, Herdeis C, Krogsgaard-Larsen P. GABABantagonists: Enantiopharmacology of 5-amino-4-hydroxy-2-methylvaleric acid and X-ray structure of the eutomer. Chirality 2004. [DOI: 10.1002/chir.530070706] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ordóñez M, González-Morales A, Salazar-Fernández H. Highly diastereoselective reduction of β-ketophosphonates bearing homochiral bis(α-methylbenzyl)amine: preparation of both enantiomers of phosphogabob (GABOBP). ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.07.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Wróblewski AE, Hałajewska-Wosik A. An efficient synthesis of an enantiomerically pure phosphonate analogue of l-GABOB. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/j.tetasy.2003.09.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ong J, Marino V, Parker DA, Kerr DI, Blythin DJ. The morpholino-acetic acid analogue Sch 50911 is a selective GABA(B) receptor antagonist in rat neocortical slices. Eur J Pharmacol 1998; 362:35-41. [PMID: 9865527 DOI: 10.1016/s0014-2999(98)00723-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The pharmacological properties of (+)-(S)-5,5-dimethylmorpholinyl-2-acetic acid (Sch 50911) were evaluated on GABA(B) receptors in rat neocortical slices. The GABA(B) receptor agonist, baclofen, produced a concentration-dependent depression of the frequency of spontaneous discharges in slices maintained in Mg2+-free Krebs medium with an EC50 of 6 microM, reversibly antagonised by Sch 50911 (5, 10 and 25 microM) with an apparent pA2 of 6.0 +/- 0.1. The (-) enantiomer Sch 50910 (500 microM) and the racemic des-methyl analogue Sch 48588 (500 microM) were inactive. In slices preloaded with [3H]GABA, Sch 50911 antagonised GABA(B) autoreceptors, increasing the electrically-stimulated 3H overflow in a concentration-dependent manner, with an IC50 of 3 microM. The maximal effect (148 +/- 10.5%) was found at 10 microM, but at 50 microM the response was reduced to 67 +/- 19%. In contrast, evoked release was unaffected by Sch 50910 (100 microM) whilst Sch 48588 at 100 microM increased the overflow by 51.3 +/- 11.6%. In summary, Sch 50911 is a relatively potent antagonist of considerable potential in studies of GABA(B) receptor function.
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Affiliation(s)
- J Ong
- Department of Anaesthesia and Intensive Care, The University of Adelaide, South Australia, Australia.
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Krogsgaard-Larsen P, Fr∅lund B, Kristiansen U, Frydenvang K, Ebert B. GABAA and GABAB receptor agonists, partial agonists, antagonists and modulators: design and therapeutic prospects. Eur J Pharm Sci 1997. [DOI: 10.1016/s0928-0987(97)10009-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
gamma-Aminobutyric acid (GABA)A receptors for the inhibitory neurotransmitter GABA are likely to be found on most, if not all, neurons in the brain and spinal cord. They appear to be the most complicated of the superfamily of ligand-gated ion channels in terms of the large number of receptor subtypes and also the variety of ligands that interact with specific sites on the receptors. There appear to be at least 11 distinct sites on GABAA receptors for these ligands.
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Affiliation(s)
- G A Johnston
- Adrien Albert Laboratory of Medicinal Chemistry, Department of Pharmacology, University of Sydney, NSW, Australia
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Kerr DI, Ong J, Doolette DJ, Schafer K, Prager RH. The (S)-enantiomer of 2-hydroxysaclofen is the active GABAB receptor antagonist in central and peripheral preparations. Eur J Pharmacol 1995; 287:185-9. [PMID: 8749034 DOI: 10.1016/0014-2999(95)00641-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In the guinea-pig isolated ileum, (RS)-(+/-)-baclofen induced a depression of cholinergic twitch contractions, reversibly and competitively antagonised by (S)-2-hydroxysaclofen (pA2 = 5.2 +/- 0.2), but not by (R)-2-hyroxysaclofen. The depression of excitatory field potentials by baclofen ( 5 mu M) in rat CA1 hippocampal slices was antagonised by (S)-2-hydroxysaclofen (100 mu m) (pA2 = 4.3), whilst in rat neocortex, (S)-2-hyroxysaclofen (50-500 mu M) antagonised the baclofen (10 mu M)-induced suppression of spontaneous discharges, the (R)-enantiomer being inactive. These results show that (S)-2-hydroxysaclofen is the active antagonist at central and peripheral GABAB receptors.
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Affiliation(s)
- D I Kerr
- Department of Anaesthesia and Intensive Care, The University of Adelaide, Adelaide, South Australia 5005, Australia
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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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Frydenvang K, Hansen JJ, Krogsgaard-Larsen P, Mitrovic A, Tran H, Drew CA, Johnston GA. GABAB antagonists: resolution, absolute stereochemistry, and pharmacology of (R)- and (S)-phaclofen. Chirality 1994; 6:583-9. [PMID: 7986672 DOI: 10.1002/chir.530060712] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Phaclofen, which is the phosphonic acid analogue of the GABAB agonist (RS)-3-(4-chlorophenyl)-4-aminobutyric acid (baclofen), is a GABAB antagonist. As part of our studies on the structural requirements for activation and blockade of GABAB receptors, we have resolved phaclofen using chiral chromatographic techniques. The absolute stereochemistry of (-)-(R)-phaclofen was established by X-ray crystallographic analysis. (-)-(R)-Phaclofen was shown to inhibit the binding of [3H]-(R)-baclofen to GABAB receptor sites on rat cerebellar membranes (IC50 = 76 +/- 13 microM), whereas (+)-(S)-phaclofen was inactive in this binding assay (IC50 > 1000 microM). (-)-(R)-Phaclofen (200 microM) was equipotent with (RS)-phaclofen (400 microM) in antagonizing the action of baclofen in rat cerebral cortical slices, while (+)-(S)-phaclofen (200 microM) was inactive. The structural similarity of the agonist (R)-baclofen and the antagonist (-)-(R)-phaclofen suggests that these ligands interact with the GABAB receptor sites in a similar manner. Thus, it may be concluded that the different pharmacological effects of these compounds essentially result from the different spatial and proteolytic properties of their acid groups.
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Affiliation(s)
- K Frydenvang
- Department of Medicinal Chemistry, Royal Danish School of Pharmacy, Copenhagen
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Affiliation(s)
- D I Kerr
- Department of Anaesthesia and Intensive Care, University of Adelaide, Australia
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Kristiansen U, Hedegaard A, Herdeis C, Lund TM, Nielsen B, Hansen JJ, Falch E, Hjeds H, Krogsgaard-Larsen P. Hydroxylated analogues of 5-aminovaleric acid as 4-aminobutyric acidB receptor antagonists: stereostructure-activity relationships. J Neurochem 1992; 58:1150-9. [PMID: 1310720 DOI: 10.1111/j.1471-4159.1992.tb09374.x] [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: 12/26/2022]
Abstract
The (R) and (S) forms of 5-amino-2-hydroxyvaleric acid (2-OH-DAVA) and 5-amino-4-hydroxyvaleric acid (4-OH-DAVA) were designed as structural hybrids of the 4-aminobutyric acidB (GABAB) agonist (R)-(-)-4-amino-3-hydroxybutyric acid [(R)-(-)-3-OH-GABA] and the GABAB antagonist 5-aminovaleric acid (DAVA). (S)-(-)-2-OH-DAVA and (R)-(-)-4-OH-DAVA showed a moderately potent affinity for GABAB receptor sites in rat brain and showed GABAB antagonist effects in a guinea pig ileum preparation. The respective enantiomers, (R)-(+)-2-OH-DAVA and (S)-(+)-4-OH-DAVA, were markedly weaker in both test systems. All four compounds were weak inhibitors of GABAA receptor binding in rat brain, and none of them significantly affected synaptosomal GABA uptake. Based on molecular modeling studies it has been demonstrated that low-energy conformations of (R)-(-)-3-OH-GABA, (S)-(-)-2-OH-DAVA, and (R)-(-)-4-OH-DAVA can be superimposed. These conformations may reflect the shapes adopted by these conformationally flexible compounds during their interaction with GABAB receptors. The present studies emphasize the similar, but distinct, constraints imposed on agonists and antagonists for GABAB receptors.
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Affiliation(s)
- U Kristiansen
- Department of Organic Chemistry, Royal Danish School of Pharmacy, Copenhagen
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