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Yamamoto J, Kawashima A, Kawamura A, Abe H, Moriwaki H, Shibata N, Soloshonok VA. Operationally Convenient and Scalable Asymmetric Synthesis of (2S
)- and (2R
)-α-(Methyl)cysteine Derivatives through Alkylation of Chiral Alanine Schiff Base NiII
Complexes. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Junya Yamamoto
- Hamari Chemicals Ltd.; 1-4-29 Kunijima, Higashi-Yodogawa-ku 53300024 Osaka Japan
| | - Aki Kawashima
- Hamari Chemicals Ltd.; 1-4-29 Kunijima, Higashi-Yodogawa-ku 53300024 Osaka Japan
| | - Akie Kawamura
- Hamari Chemicals Ltd.; 1-4-29 Kunijima, Higashi-Yodogawa-ku 53300024 Osaka Japan
| | - Hidenori Abe
- Hamari Chemicals Ltd.; 1-4-29 Kunijima, Higashi-Yodogawa-ku 53300024 Osaka Japan
| | - Hiroki Moriwaki
- Hamari Chemicals Ltd.; 1-4-29 Kunijima, Higashi-Yodogawa-ku 53300024 Osaka Japan
| | - Norio Shibata
- Department of Nanopharmaceutical Science & Department of Frontier Materials; Nagoya Institute of Technology; Gokiso, Showa-ku 466-8555 Nagoya Japan
| | - Vadim A. Soloshonok
- Department of Organic Chemistry I; Faculty of Chemistry; University of the Basque Country UPV/EHU; Paseo Manuel Lardizabal 20018 San Sebastian Spain
- IKERBASQUE; Basque Foundation for Science; Maria Diaz de Haro 3 48013 Bilbao Spain
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2
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Liu L, Budnjo A, Jokela J, Haug BE, Fewer DP, Wahlsten M, Rouhiainen L, Permi P, Fossen T, Sivonen K. Pseudoaeruginosins, nonribosomal peptides in Nodularia spumigena. ACS Chem Biol 2015; 10:725-33. [PMID: 25419633 DOI: 10.1021/cb5004306] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nodularia spumigena is a filamentous cyanobacterium that forms toxic blooms in brackish waters around the world through the production of the pentapeptide toxin nodularin. This cyanobacterium also produces large amounts of protease inhibitors belonging to the aeruginosin and spumigin families. Here we report the discovery of previously unknown protease inhibitors, pseudoaeruginosins NS1 (1) and NS2 (2), from 33 strains of N. spumigena isolated from the Baltic Sea. Pseudoaeruginosin NS1 (1) and NS2 (2) contain hexanoic acid, tyrosine, 4-methylproline, and argininal/argininol. The chemical structure of the two pseudoaeruginosins was verified by thorough comparison of the liquid chromatography-mass spectrometry (LC-MS) analyses of the extracts from the N. spumigena strains with synthetic peptides. The structures of the synthetic pseudoaeruginosins were confirmed using nuclear magnetic resonance spectroscopy. Surprisingly, the structure of pseudoaeruginosin NS1 (1) and NS2 (2) combines features of both aeruginosins and spumigins, suggesting that they have been produced through the joint action of both the spumigin and aeruginosin biosynthesis pathways. We screened with polymerase chain reaction and LC-MS 68 N. spumigena strains from the Baltic Sea and Australia. Pseudoaeruginosins were present in half of the Baltic Sea strains but were not found from the Australian strains. The production of pseudoaeruginosin seems to be coupled to the production of aeruginosins and 4-methylproline-containing spumigins. Pseudoaeruginosin NS1 was found to be as potent trypsin inhibitor as the most potent aeruginosins and spumigins with an IC50 of 0.19 ± 0.04 μM. This finding suggests that cooperation between the spumigin and aeruginosin biosynthetic pathways results in hybrid pseudoaeruginosin peptides.
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Affiliation(s)
- Liwei Liu
- Food and
Environmental Sciences, Division of Microbiology and Biotechnology, University of Helsinki, P.O. Box 56, Viikki Biocenter, Viikinkaari 9, FI-00014 Helsinki, Finland
| | - Adnan Budnjo
- Department of Chemistry and Centre for Pharmacy, University of Bergen, Allégaten 41, 5007 Bergen, Norway
| | - Jouni Jokela
- Food and
Environmental Sciences, Division of Microbiology and Biotechnology, University of Helsinki, P.O. Box 56, Viikki Biocenter, Viikinkaari 9, FI-00014 Helsinki, Finland
| | - Bengt Erik Haug
- Department of Chemistry and Centre for Pharmacy, University of Bergen, Allégaten 41, 5007 Bergen, Norway
| | - David P. Fewer
- Food and
Environmental Sciences, Division of Microbiology and Biotechnology, University of Helsinki, P.O. Box 56, Viikki Biocenter, Viikinkaari 9, FI-00014 Helsinki, Finland
| | - Matti Wahlsten
- Food and
Environmental Sciences, Division of Microbiology and Biotechnology, University of Helsinki, P.O. Box 56, Viikki Biocenter, Viikinkaari 9, FI-00014 Helsinki, Finland
| | - Leo Rouhiainen
- Food and
Environmental Sciences, Division of Microbiology and Biotechnology, University of Helsinki, P.O. Box 56, Viikki Biocenter, Viikinkaari 9, FI-00014 Helsinki, Finland
| | - Perttu Permi
- Program in Structural
Biology and Biophysics, Institute of Biotechnology, University of Helsinki, P.O. Box 65, FI-00014 Helsinki, Finland
| | - Torgils Fossen
- Department of Chemistry and Centre for Pharmacy, University of Bergen, Allégaten 41, 5007 Bergen, Norway
| | - Kaarina Sivonen
- Food and
Environmental Sciences, Division of Microbiology and Biotechnology, University of Helsinki, P.O. Box 56, Viikki Biocenter, Viikinkaari 9, FI-00014 Helsinki, Finland
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3
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Torbeev V, Ebert MO, Dolenc J, Hilvert D. Substitution of proline32 by α-methylproline preorganizes β2-microglobulin for oligomerization but not for aggregation into amyloids. J Am Chem Soc 2015; 137:2524-35. [PMID: 25633201 DOI: 10.1021/ja510109p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Conversion of soluble folded proteins into insoluble amyloids generally proceeds in three distinct mechanistic stages: (1) initial protein misfolding into aggregation-competent conformers, (2) subsequent formation of oligomeric species and, finally, (3) self-assembly into extended amyloid fibrils. In the work reported herein, we interrogated the amyloidogenesis mechanism of human β2-microglobulin (β2m), which is thought to be triggered by a pivotal cis-trans isomerization of a proline residue at position 32 in the polypeptide, with nonstandard amino acids. Using chemical protein synthesis we prepared a β2m analogue in which Pro32 was replaced by the conformationally constrained amino acid α-methylproline (MePro). The strong propensity of MePro to adopt a trans prolyl bond led to enhanced population of a non-native [trans-MePro32]β2m protein conformer, which readily formed oligomers at neutral pH. In the presence of the antibiotic rifamycin SV, which inhibits amyloid growth of wild-type β2m, [MePro32]β2m was nearly quantitatively converted into different spherical oligomeric species. Self-assembly into amyloid fibrils was not observed in the absence of seeding, however, even at low pH (<3), where wild-type β2m spontaneously forms amyloids. Nevertheless, we found that aggregation-preorganized [MePro32]β2m can act in a prion-like fashion, templating misfolded conformations in a natively folded protein. Overall, these results provide detailed insight into the role of cis-trans isomerization of Pro32 and ensuing structural rearrangements that lead to initial β2m misfolding and aggregation. They corroborate the view that conformational protein dynamics enabled by reversible Pro32 cis-trans interconversion rather than simple population of the trans conformer is critical for both nucleation and subsequent growth of β2m amyloid structures.
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Affiliation(s)
- Vladimir Torbeev
- Laboratory of Organic Chemistry and ‡Laboratory of Physical Chemistry, ETH Zurich , Zurich CH-8093, Switzerland
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4
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Synthesis, resolution, and determination of absolute configuration of protected α-ethynylphenylalanine enantiomers. Amino Acids 2015; 47:899-907. [DOI: 10.1007/s00726-015-1917-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 01/07/2015] [Indexed: 10/24/2022]
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5
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Bhagwanth S, Mishra RK, Johnson RL. Development of peptidomimetic ligands of Pro-Leu-Gly-NH(2) as allosteric modulators of the dopamine D(2) receptor. Beilstein J Org Chem 2013; 9:204-14. [PMID: 23400263 PMCID: PMC3566759 DOI: 10.3762/bjoc.9.24] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 12/24/2012] [Indexed: 12/24/2022] Open
Abstract
A variety of stable, small-molecule peptidomimetic ligands have been developed to elucidate the mechanism by which the neuropeptide Pro-Leu-Gly-NH2 (PLG) modulates dopaminergic neurotransmission. Photoaffinity labeling ligands based upon PLG peptidomimetics have been used to establish that PLG binds to the D2 dopamine receptor at a site that is different from the orthosteric site, thus making PLG and its peptidomimetics allosteric modulators of the dopamine receptor. Through the design, synthesis and pharmacological evaluation of conformationally constrained peptidomimetics containing lactam, bicyclic, and spiro-bicyclic scaffolds, support was provided for the hypothesis that the bioactive conformation of PLG is a type II β-turn. In addition, studies with peptidomimetics designed to mimic either a type VI β-turn or polyproline II helix conformation yielded molecules that were able to modulate dopamine receptors because of their ability to place the carboxamide NH2 pharmacophore in the same topological space as that seen in the type II β-turn. Extensive studies with the spiro-bicyclic PLG peptidomimetics also established that both positive and negative modes of modulation were possible for the same series of peptidomimetics simply as a result of minor differences in the stereochemistry about the bridgehead carbon within the scaffold. This information was used to transform existing positive modulators into negative modulators, which demonstrated that small structural changes in the spiro-bicyclic dopamine receptor modulators are capable of causing major changes in the modulatory activity of PLG peptidomimetics.
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Affiliation(s)
- Swapna Bhagwanth
- Department of Medicinal Chemistry, University of Minnesota, 308 Harvard Street SE, Minneapolis, MN 55455, USA
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6
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Torbeev VY, Fumi E, Ebert MO, Schweizer WB, Hilvert D. cis-transPeptide-Bond Isomerization inα-Methylproline Derivatives. Helv Chim Acta 2012. [DOI: 10.1002/hlca.201200483] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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7
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Dighe SN, Jadhav HR. Microwave assisted mild, rapid, solvent-less, and catalyst-free chemoselective N-tert-butyloxycarbonylation of amines. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.08.089] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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8
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Fatás P, Gil AM, Calaza MI, Jiménez AI, Cativiela C. Access to Enantiomerically Pure cis
- and trans
-β-Phenylproline by High-Performance Liquid Chromatography Resolution. Chirality 2012; 24:1082-91. [DOI: 10.1002/chir.22101] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Accepted: 07/04/2012] [Indexed: 02/03/2023]
Affiliation(s)
- Paola Fatás
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; 50009 Zaragoza Spain
| | - Ana M. Gil
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; 50009 Zaragoza Spain
| | - M. Isabel Calaza
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; 50009 Zaragoza Spain
| | - Ana I. Jiménez
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; 50009 Zaragoza Spain
| | - Carlos Cativiela
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; 50009 Zaragoza Spain
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9
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New 1,3-amino alcohols derived from enantiopure bridgehead β-aminobicyclo[2.2.2]oct-5-ene-2-carboxylic acids. Amino Acids 2011; 43:415-21. [PMID: 21968501 DOI: 10.1007/s00726-011-1097-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 09/19/2011] [Indexed: 10/17/2022]
Abstract
Constrained enantiopure bicyclic β-amino acids derived from the asymmetric Diels-Alder reaction of the (R)-benzyl-4-(3-acryloyloxy-4,4-dimethyl-2-oxopyrrolidin-1-yl)-benzoate and the 1-(benzyloxycarbonylamino)cyclohexadiene provide original templates for the construction of new rigid enantiopure 1,3-amino alcohols.
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10
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Jahani F, Tajbakhsh M, Khaksar S, Azizi MR. An efficient and highly chemoselective N-Boc protection of amines, amino acids, and peptides under heterogeneous conditions. MONATSHEFTE FUR CHEMIE 2011. [DOI: 10.1007/s00706-011-0534-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Thioglycoluril as a highly efficient, recyclable and novel organocatalyst for N-Boc protection of amines. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.09.096] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Siddaiah V, Basha GM, Rao GP, Prasad UV, Rao RS. PEG-mediated Facile Protocol forN-Boc Protection of Amines. CHEM LETT 2010. [DOI: 10.1246/cl.2010.1127] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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13
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Ganguly B, Kesharwani MK, Matković M, Basarić N, Singh A, Mlinarić-Majerski K. Hydrolysis and retro-aldol cleavage of ethyl threo-2-(1-adamantyl)-3-hydroxybutyrate: competing reactions. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1793] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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A Concise, metathesis based approach to construction of the lepadiformine/cylindricine tricyclic framework. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.06.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Lumini M, Cordero FM, Pisaneschi F, Brandi A. Straightforward Synthesis of α-Substituted Prolines by Cross-Metathesis. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800044] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Chiral separation of selected proline derivatives using a polysaccharide-type stationary phase by supercritical fluid chromatography and comparison with high-performance liquid chromatography. J Chromatogr A 2008; 1189:245-53. [DOI: 10.1016/j.chroma.2007.11.033] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2007] [Revised: 10/30/2007] [Accepted: 11/09/2007] [Indexed: 11/20/2022]
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17
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Raghavan B, Balasubramanian R, Steele JC, Sackett DL, Fecik RA. Cytotoxic simplified tubulysin analogues. J Med Chem 2008; 51:1530-3. [PMID: 18314944 DOI: 10.1021/jm701321p] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient route for the synthesis of the tubulysin family of antimitotic peptides was developed. Simplified tubulysin analogues were synthesized to define the minimum pharmacophore required for cytotoxicity. Simplified tubulysin analogues retain significant cytotoxicity and reveal important preliminary structure-activity relationships.
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Affiliation(s)
- Bhooma Raghavan
- Department of Medicinal Chemistry. 308 Harvard Street SE, University of Minnesota, Minneapolis, MN 55455, USA
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18
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Vartak AP, Skoblenick K, Thomas N, Mishra RK, Johnson RL. Allosteric modulation of the dopamine receptor by conformationally constrained type VI beta-turn peptidomimetics of Pro-Leu-Gly-NH2. J Med Chem 2007; 50:6725-9. [PMID: 18052024 DOI: 10.1021/jm070895r] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A peptidomimetic of Pro-Leu-Pro-NH2, 7, possessing an indolizidinone type VI beta-turn mimic was synthesized via improved high-yielding protocols for the preparation and Cbz protection of alpha-allylproline. Bicyclic peptidomimetic 7 and spirobicylic peptidomimetic 8 enhanced the binding of [3H] N-propylnorapomorphine to dopamine receptors indicating that a type VI beta-turn is a possible bioactive conformation of the homochiral Pro-Leu-Pro-NH2 and Pro-Pro-Pro-NH 2 analogues of Pro-Leu-Gly-NH2 at the dopamine receptor allosteric regulatory site.
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Affiliation(s)
- Ashish P Vartak
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis 55455-0343, USA
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19
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Heydari A, Shiroodi RK, Hamadi H, Esfandyari M, Pourayoubi M. N-tert-Butoxycarbonylation of amines using H3PW12O40 as an efficient heterogeneous and recyclable catalyst. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.06.064] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Zhao Y, Pritts WA. Chiral separation of selected proline derivatives using a polysaccharide type stationary phase by high-performance liquid chromatography. J Chromatogr A 2007; 1156:228-35. [PMID: 17266975 DOI: 10.1016/j.chroma.2007.01.015] [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] [Received: 07/31/2006] [Revised: 12/28/2006] [Accepted: 01/02/2007] [Indexed: 11/22/2022]
Abstract
Proline derivatives, such as Boc-proline, Boc-2-methylproline, Boc-2-methylproline benzyl ester and Boc-2-methyl-4-hydroxy-proline benzyl ester, have been widely used as a building block leading to a variety of pharmaceutical compounds. Therefore, there is a wide interest in the chiral separation of these compounds. High-performance liquid chromatography (HPLC) methods were developed using a Chiralpak AD-H column to separate enantiomers of these proline derivatives. The effect of mobile phase composition and column temperature was studied. For the proline derivatives studied in this work, good resolution was achieved using a mobile phase composition of hexane, ethanol and 0.1% TFA. For prolines containing carboxyl or hydroxy group, resolution was changed dramatically corresponding to changes as little as 1% of ethanol in the mobile phase, suggesting that the dominant chiral recognition is from hydrogen bonding interactions. On the other hand, for prolines containing a benzyl ester instead of hydroxy group next to the chiral center, resolution was not affected as significantly with the changes of ethanol content in the mobile phase, indicating a different leading chiral recognition mechanism, such as inclusion, steric effect, or possible pi-pi interaction. Linearity, precision and limit of detection were also measured for Boc-2-methylproline and Boc-2-methylproline benzyl ester.
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Affiliation(s)
- Yanqun Zhao
- Abbott Laboratories, 1401 Sheridan Road, North Chicago, IL 60046, USA.
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21
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Brasca MG, Albanese C, Amici R, Ballinari D, Corti L, Croci V, Fancelli D, Fiorentini F, Nesi M, Orsini P, Orzi F, Pastori W, Perrone E, Pesenti E, Pevarello P, Riccardi-Sirtori F, Roletto F, Roussel P, Varasi M, Vulpetti A, Mercurio C. 6-Substituted Pyrrolo[3,4-c]pyrazoles: An Improved Class of CDK2 Inhibitors. ChemMedChem 2007; 2:841-52. [PMID: 17450625 DOI: 10.1002/cmdc.200600302] [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: 11/10/2022]
Abstract
We have recently reported a new class of CDK2/cyclin A inhibitors based on a bicyclic tetrahydropyrrolo[3,4-c]pyrazole scaffold. The introduction of small alkyl or cycloalkyl groups in position 6 of this scaffold allowed variation at the other two diversity points. Conventional and polymer-assisted solution phase chemistry provided a way of generating compounds with improved biochemical and cellular activity. Optimization of the physical properties and pharmacokinetic profile led to a compound which exhibited good efficacy in vivo on A2780 human ovarian carcinoma.
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Affiliation(s)
- Maria Gabriella Brasca
- Oncology Business Unit, Department of Chemistry, Nerviano Medical Sciences, Viale Pasteur 10, 20014 Nerviano MI, Italy.
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Montmorillonite K 10 and montmorillonite KSF as new and reusable catalysts for conversion of amines to N-tert-butylcarbamates. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.03.042] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Chankeshwara SV, Chakraborti AK. Catalyst-Free Chemoselective N-tert-Butyloxycarbonylation of Amines in Water. Org Lett 2006; 8:3259-62. [PMID: 16836380 DOI: 10.1021/ol0611191] [Citation(s) in RCA: 144] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[Structure: see text] Catalyst-free N-tert-butyloxycarbonylation of amines in water is reported. The N-t-Boc derivatives were formed chemoselectively without any isocyanate, urea, N,N-di-t-Boc, and O/S-t-Boc as side products. Chiral amines, esters of alpha-amino acids, and beta-amino alcohol afforded optically pure N-t-Boc derivatives. Amino alcohol and 2-aminophenol afforded the N-t-Boc derivative without oxazolidinone formation. Selectivity was observed during competition of aromatic amine vs aliphatic amine, amine vs amino acid ester, amine vs amino alcohol, and primary amine vs secondary amine.
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Affiliation(s)
- Sunay V Chankeshwara
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar 160 062, Punjab, India
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Alonso De Diego SA, Gutiérrez-Rodríguez M, Pérez de Vega MJ, González-Muñiz R, Herranz R, Martín-Martínez M, Cenarruzabeitia E, Frechilla D, Del Río J, Jimeno ML, García-López MT. The neuroprotective activity of GPE tripeptide analogues does not correlate with glutamate receptor binding affinity. Bioorg Med Chem Lett 2006; 16:3396-400. [PMID: 16650992 DOI: 10.1016/j.bmcl.2006.04.033] [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] [Received: 02/27/2006] [Revised: 04/05/2006] [Accepted: 04/05/2006] [Indexed: 11/21/2022]
Abstract
The influence of several modifications on the GPE tripeptide structure upon the binding to GluRs and on their neuroprotective effects has been studied. The results indicated that the prevention of neuronal death showed by GPE and some analogues is not directly related to their affinity at glutamate receptors.
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Kowalczyk W, Prahl A, Derdowska I, Sobolewski D, Olejnik J, Zabrocki J, Borovicková L, Slaninová J, Lammek B. Analogues of neurohypophyseal hormones, oxytocin and arginine vasopressin, conformationally restricted in the N-terminal part of the molecule. J Med Chem 2006; 49:2016-21. [PMID: 16539389 DOI: 10.1021/jm058038f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
It is generally accepted that the conformation of the N-terminal part of neurohypophyseal hormones analogues is important for their pharmacological activity. In this work, we decided to investigate how the substitution of positions 2 and 3 with the ethylene-bridged dipeptide would alter the pharmacological properties of OT, [Mpa1]OT, and [Cpa1]OT (OT=oxytocin; Mpa=3-mercaptopropionic acid; Cpa=1-mercaptocyclohexaneacetic acid) and to investigate how a bulky 3,3-diphenyl-L-alanine residue incorporated in position 2 of AVP, [Mpa1]AVP, and [Cpa1]AVP (AVP=arginine vasopressin) would change the pharmacological profile of the compounds. The next analogues, [Val4]AVP, [Mpa1,Val4]AVP, and [Cpa1,Val4]AVP, had N-benzyl-L-alanine introduced at position 3. The last peptide was designed by Cys1 substitution in AVP by its sterically restricted bulky counterpart, alpha-hydroxymethylcysteine. All the peptides were tested for their in vitro uterotonic, pressor, and antidiuretic activities in the rat. The results of these assays showed that the reduction of conformational freedom of the N-terminal part of the molecule had a significant impact on pharmacological activities.
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Affiliation(s)
- Wioleta Kowalczyk
- Faculty of Chemistry, University of Gdañsk, Sobieskiego 18, 80-952 Gdañsk, Poland.
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Chankeshwara SV, Chakraborti AK. Copper(II) tetrafluoroborate as a novel and highly efficient catalyst for N-tert-butoxycarbonylation of amines under solvent-free conditions at room temperature. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2005.12.044] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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27
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Chakraborti AK, Chankeshwara SV. HClO4–SiO2as a new, highly efficient, inexpensive and reusable catalyst for N-tert-butoxycarbonylation of amines. Org Biomol Chem 2006; 4:2769-71. [PMID: 16826301 DOI: 10.1039/b605074c] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Perchloric acid adsorbed on silica-gel (HClO4-SiO2) was found to be a new, highly efficient, inexpensive and reusable catalyst for chemoselective N-tert-butoxycarbonylation of amines at room temperature and under solvent-free conditions.
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Affiliation(s)
- Asit K Chakraborti
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S. A. S. Nagar 160 062, Punjab, India.
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28
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Tsai P, Marra JM, Pou S, Bowman MK, Rosen GM. Is There Stereoselectivity in Spin Trapping Superoxide by 5-tert-Butoxycarbonyl-5-methyl-1-pyrroline N-Oxide? J Org Chem 2005; 70:7093-7. [PMID: 16122227 DOI: 10.1021/jo050692f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Ester-containing nitrones, including 5-tert-butoxycarbonyl-5-methyl-1-pyrroline N-oxide 5, have been reported to be robust spin traps for superoxide (O2*-). Using a chiral column, we have been able to isolate the two enantiomers of nitrone 5. With enantiomerically pure nitrone 5a and 5b we explored whether one of these isomers was solely responsible for the EPR spectrum of aminoxyl 6. Data obtained demonstrate that the spin trapping of O2*- by nitrone 5a and nitrone 5b affords the identical EPR spectra and lifetimes in homogeneous aqueous solution and exhibits the same ratio of cis and trans isomers. Quantum chemical modeling in vacuo also finds no difference, aside from the expected optical activity, arising from the difference in stereochemistry.
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Affiliation(s)
- Pei Tsai
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, Maryland 21201, USA
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29
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Pettersen D, Ahlberg P. Synthesis of enantiopure 5.7-spirodiamines: (S)-1,7-diaza[4.6]undecane and related compounds. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.tetasy.2005.04.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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30
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Witkowska R, Chung NN, Schiller PW, Zabrocki J. Synthesis and biological activity profile of new analogues of the cyclic opioid peptide H-Tyr-c[D
-Cys-Gly-Phe(p
NO2
)-D
-Cys]-NH2
containing (S
)-α-hydroxymethylcysteine in place of cysteine. J Pept Sci 2004; 11:361-3. [PMID: 15635653 DOI: 10.1002/psc.620] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To examine the effect on biological activity of replacing D-Cys in the opioid peptide H-Tyr-c[D-Cys-Gly-Phe(pNO(2))-D-Cys]-NH(2) in position 2 or/and 5 with alpha-hydroxymethylcysteine (alpha-Hmc), three analogues were synthesized. These compounds exhibit agonist activity at both mu and delta receptors. However, the most active analogue, with (S)-alpha-Hmc residue in position 5, was 3360- and 2190-fold less active than the parent peptide in the GPI and MVD assays, respectively.
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Affiliation(s)
- Renata Witkowska
- Institute of Organic Chemistry, Technical University of Łódź, Łódź, Poland
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31
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Gutiérrez-Rodríguez M, Martín-Martínez M, García-López MT, Herranz R, Cuevas F, Polanco C, Rodríguez-Campos I, Manzanares I, Cárdenas F, Feliz M, Lloyd-Williams P, Giralt E. Synthesis, Conformational Analysis, and Cytotoxicity of Conformationally Constrained Aplidine and Tamandarin A Analogues Incorporating a Spirolactam β-Turn Mimetic. J Med Chem 2004; 47:5700-12. [PMID: 15509169 DOI: 10.1021/jm040788m] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
With the aim of studying the contribution of the beta II turn conformation at the side chain of didemnins to the bioactive conformation responsible for their antitumoral activity, conformationally restricted analogues of aplidine and tamandarin A, where the side chain dipeptide Pro8-N-Me-d-Leu7 is replaced with the spirolactam beta II turn mimetic (5R)-7-[(1R)-1-carbonyl-3-methylbutyl]-6-oxo-1,7-diazaspiro[4.4]nonane, were prepared. Additionally, restricted analogues, where the aplidine (pyruvyl9) or tamandarin A [(S)-Lac9] acyl groups are replaced with the isobutyryl, Boc, and 2-methylacryloyl groups, were also prepared. These structural modifications were detrimental to cytotoxic activity, leading to a decrease of 1-2 orders of magnitude with respect to that exhibited by aplidine and tamandarin A. The conformational analysis of one of these spirolactam aplidine analogues, by NMR and molecular modeling methods, showed that the conformational restriction caused by the spirolactam does not produce significant changes in the overall conformation of aplidine, apart from preferentially stabilizing the trans rotamer at the pyruvyl9-spirolactam amide bond, whereas in aplidine both cis and trans rotamers at the pyruvyl9-Pro8 amide bond are more or less equally stabilized. These results seem to indicate a preference for the cis form at that amide bond in the bioactive conformation of aplidine. The significant influence of this cis/trans isomerism upon the cytotoxicity suggests a possible participation of a peptidylprolyl cis/trans isomerase in the mechanism of action of aplidine.
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32
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Gutiérrez-Rodrı́guez M, Garcı́a-López M, Herranz R. Improved synthesis of a [4.4]-spirolactam β-turn mimetic as surrogate of the didemnin side chain dipeptide Pro-N-Me-d-Leu. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.04.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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33
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Colombo L, Di Giacomo M, Vinci V, Colombo M, Manzoni L, Scolastico C. Synthesis of new bicyclic lactam peptidomimetics by ring-closing metathesis reactions. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00684-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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34
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Kawasaki M, Namba K, Tsujishima H, Shinada T, Ohfune Y. Efficient synthesis of optically active α-substituted glutamate analogs possessing α-hydroxymethyl and α-alkoxymethyl groups. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(02)02810-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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35
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Fernández MM, Diez A, Rubiralta M, Montenegro E, Casamitjana N, Kogan MJ, Giralt E. Spirolactams as conformationally restricted pseudopeptides: synthesis and conformational analysis. J Org Chem 2002; 67:7587-99. [PMID: 12398477 DOI: 10.1021/jo025999i] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of 1-(tert-butoxycarbonyl)-7-[1-(tert-butoxycarbonyl)-3-methylbutyl]-6-oxo-1,7-diazaspiro[4.5]decanes (S,S)-1a and (S,R)-1b is described. Derivatives 17a,b and 19a are prepared for use in peptide synthesis as constrained surrogates of the Pro-Leu and Gly-Leu dipeptides. The Ac-[Gly-Leu]-Met-NH(2) derivatives (S,S,S)-2a and (S,R,S)-2b, with the tripeptidic C-terminal region present in tachykinins, are also synthesized. Conformational analyses of these tripetide analogues by NMR experiments and molecular modeling calculations show that both (S,S,S)-2a and (S,R,S)-2b epimers are gamma-turn/distorted type II beta-turn mimetics.
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Affiliation(s)
- M Montserrat Fernández
- Departament de Química Orgànica, Facultat de Química, Universitat de Barcelona, c/Martí i Franquès, Spain
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36
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Peggion C, Moretto V, Formaggio F, Crisma M, Toniolo C, Kamphuis J, Kaptein B, Broxterman QB. Partial [alphaMe]Aun scan of [l-Leu11-OMe]-trichogin GA IV, a membrane active synthetic precursor of the natural lipopeptaibol. THE JOURNAL OF PEPTIDE RESEARCH : OFFICIAL JOURNAL OF THE AMERICAN PEPTIDE SOCIETY 2001; 58:317-24. [PMID: 11606216 DOI: 10.1034/j.1399-3011.2001.00919.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We synthesized using solution-phase methods three analogs of [l-Leu11-OMe] trichogin GA IV, a membrane active synthetic precursor of the lipopeptaibol antibiotic in which the N-terminal n-octanoyl group and each of the three Aib residues in positions 1, 4 and 8 are replaced by an acetyl group and the lipophilic Calpha,alpha-disubstituted glycine l-(alphaMe)Aun, respectively [partial (alphaMe)Aun scan]. FT-IR absorption and CD analyses unequivocally show that the main three-dimensional structural features of [l-Leu11-OMe] trichogin GA IV are preserved in the analogs. Also, [l-Leu11-OMe] trichogin GA IV and the three Nalpha-acetylated l-(alphaMe)Aun analogs exhibit strictly comparable membrane-modifying properties. Taken together, these results strongly favor the conclusion that a shift of the long hydrocarbon moiety from the Nalpha-blocking group to the side-chain of the 1, 4 or 8 residue does not have any significant effect on the conformational properties or the membrane activity of [l-Leu11-OMe] trichogin GA IV and, by extension, of the natural lipopeptaibol.
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Affiliation(s)
- C Peggion
- Biopolymer Research Center, CNR, Department of Organic Chemistry, University of Padova, Via Marzolo 1, 35131 Padua, Italy
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37
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Boesch H, Cesco-Cancian S, Hecker LR, Hoekstra WJ, Justus M, Maryanoff CA, Scott L, Shah RD, Solms G, Sorgi KL, Stefanick SM, Thurnheer U, Villani, FJ, Walker DG. An Expedient Method for Resolution of 3-Amino-3-(3‘-pyridyl)propionic Acid and Related Compounds. Org Process Res Dev 2000. [DOI: 10.1021/op990192m] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Heinz Boesch
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Sergio Cesco-Cancian
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Leonard R. Hecker
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - William J. Hoekstra
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Michael Justus
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Cynthia A. Maryanoff
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Lorraine Scott
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Rekha D. Shah
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Guenter Solms
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Kirk L. Sorgi
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Stephen M. Stefanick
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Urs Thurnheer
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Frank J. Villani,
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
| | - Donald G. Walker
- Cilag AG, Hochstrasse 201, CH-8205 Schaffhausen, Switzerland, The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, 1000 Route 202, P.O. Box 300, Raritan, New Jersey 08869-0602, U.S.A., The R.W. Johnson Pharmaceutical Research Institute, New Product Research, Department of Chemical Development, Welsh & McKean Roads, Spring House, Pennsylvania 19477-0776, U.S.A., and The R.W. Johnson Pharmaceutical Research Institute, Drug Discovery, Welsh & McKean
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38
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Peggion C, Mossel E, Formaggio F, Crisma M, Kaptein B, Broxterman QB, Kamphuis J, Toniolo C. (alphaMe)Aun: a highly lipophilic, chiral, Calpha-tetrasubstituted alpha-amino acid. Incorporation into model peptides and preferred conformation. THE JOURNAL OF PEPTIDE RESEARCH : OFFICIAL JOURNAL OF THE AMERICAN PEPTIDE SOCIETY 2000; 55:262-9. [PMID: 10727109 DOI: 10.1034/j.1399-3011.2000.00171.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Using a chemo-enzymatic approach we prepared the highly lipophilic, chiral, Calpha-methylated alpha-amino acid (alphaMe)Aun. Two series of terminally protected model peptides containing either D-(alphaMe)Aun in combination with Aib or L-(alphaMe)Aun in combination with Gly were synthesized using solution methods and fully characterized. A detailed solution conformational analysis, based on FT-IR absorption, 1H NMR and CD techniques, allowed us to determine the preferred conformation of this amino acid and the relationship between chirality at its alpha-carbon atom and screw sense of the helix that is formed. The results obtained strongly support the view that D-(alphaMe)Aun favors the formation of the left-handed 3(10)-helical conformation.
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Affiliation(s)
- C Peggion
- Department of Organic Chemistry, University of Padova, Italy
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39
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Peggion C, Formaggio F, Crisma M, Toniolo C, Kaptein B, Broxterman QB, Kamphuis J. Preferred solution conformation of peptides rich in the lipophilic, chiral, C(alpha)-methylated alpha-amino acid (alpha Me)Aoc. J Pept Sci 1999; 5:547-54. [PMID: 10628654 DOI: 10.1002/(sici)1099-1387(199912)5:12<547::aid-psc221>3.0.co;2-8] [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: 11/06/2022]
Abstract
The lipophilic, chiral, C(alpha)-methylated alpha-amino acid L-(alphaMe)Aoc (2-methyl-2-amino-octanoic acid) was prepared using a chemo-enzymatic approach. Two series of terminally protected model peptides, from dimer through to hexamer, containing L-(alphaMe)Aoc in combination with either Gly or Aib, were synthesized by solution methods and were fully characterized. A solution conformational analysis, based on FT-IR absorption, 1H-NMR and circular dichroism (CD) techniques, was performed with the aim at determining the preferred conformation of this novel amino acid and the relationship between chirality at its alpha-carbon atom and screw sense of the helix that is formed. The results obtained strongly support the view that L-(alphaMe)Aoc favours the formation of the right-handed 3(10)-helical conformation.
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Affiliation(s)
- C Peggion
- Biopolymer Research Centre, CNR, Department of Organic Chemistry, University of Padova, Italy
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40
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Khalil EM, Ojala WH, Pradhan A, Nair VD, Gleason WB, Mishra RK, Johnson RL. Design, synthesis, and dopamine receptor modulating activity of spiro bicyclic peptidomimetics of L-prolyl-L-leucyl-glycinamide. J Med Chem 1999; 42:628-37. [PMID: 10052970 DOI: 10.1021/jm980525q] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the present study, the synthesis of the 5.5.6. and 5.6.5. spiro bicyclic lactam PLG peptidomimetics, compounds 3 and 4, respectively, was undertaken. These peptidomimetics were designed to examine the following: (1) the effect that changing the size of the thiazolidine and lactam ring systems would have on the ability of these systems to mimic the type-II beta-turn and (2) the effect that these structural perturbations would have on the ability of the peptidomimetics to modulate dopamine receptors. Through the use of the [3H]spiroperidol/N-propylnorapomorphine (NPA) dopamine D2 receptor competitive binding assay, 3 and 4, at a concentration of 100 nM, decreased the dissociation constant of the high-affinity state of the dopamine receptor for the agonist. These effects were observed when either Gpp(NH)p was absent or present and they were comparable to those produced by PLG at a concentration of 1 microM. Peptidomimetics 3 and 4 also increased the percentage of D2 receptors that existed in the high-affinity state. Even with Gpp(NH)p present, 3 and 4 were able to return the RH/RL ratios to values observed in the respective controls where Gpp(NH)p was absent. Furthermore, both peptidomimetics were able to attenuate the Gpp(NH)p-induced shift to the low-affinity state to a greater extent than PLG. Peptidomimetics 3 and 4 were evaluated in vivo as modulators of apomorphine-induced rotational behavior in the 6-hydroxydopamine-lesioned rat model of hemiparkinsonism, and each affected the rotational behavior in a bell-shaped dose-response relationship producing increases of 95 +/- 31% (0.01 mg/kg, ip) and 88 +/- 14% (0.001 mg/kg, ip), respectively. In comparison, the previously reported 5.5.5. spiro bicyclic lactam 2 increased rotational behavior by 25 +/- 11% (0.01 mg/kg, ip).
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Affiliation(s)
- E M Khalil
- Department of Medicinal Chemistry and The Biomedical Engineering Center, University of Minnesota, Minneapolis, Minnesota 55455, USA
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41
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Galoppini C, Meini S, Tancredi M, Di Fenza A, Triolo A, Quartara L, Maggi CA, Formaggio F, Toniolo C, Mazzucco S, Papini A, Rovero P. A new class of pseudopeptide antagonists of the kinin B1 receptor containing alkyl spacers. J Med Chem 1999; 42:409-14. [PMID: 9986712 DOI: 10.1021/jm980495r] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Four previously reported kinin receptor peptide antagonists, including the B1 receptor-selective peptides desArg10-HOE 140 (H-D-Arg-Arg-Pro-Hyp-Gly-Thi-Ser-D-Tic-Oic-OH) and B-9858 (H-Lys-Lys-Arg-Pro-Hyp-Gly-Igl-Ser-D-Igl-Oic-OH), have been modified by replacement of the central tetrapeptide Pro-Hyp-Gly-Xaa with linear alkyl spacers of variable length. The analogue of desArg10-HOE 140 containing the 11-aminoundecanoic acid as spacer, MEN 11575 [H-D-Arg-Arg-NH-(CH2)10-CO-Ser-D-Tic-Oic-OH], was found to be slightly more potent than the unmodified peptide (pA2 = 7.1) as a kinin B1 receptor antagonist in the rat ileum longitudinal smooth muscle assay. Moreover, MEN 11575 is devoid of residual agonist activity at the kinin B1 receptor (rat ileum) and antagonist activity at the kinin B2 receptor (guinea pig ileum longitudinal smooth muscle). Both these activities are displayed by the parent peptide desArg10-HOE 140. Therefore, despite its greatly simplified chemical structure, MEN 11575 shows an improved pharmacological profile in terms of both potency and selectivity, and it represents a good template for the development of new peptidomimetic kinin B1 receptor antagonists. We also report an attempt to investigate the conformational role of the flexible, linear spacer of MEN 11575 and to design more constrained analogues, possibly locked in the bioactive conformation, using semirigid spacers based on Calpha-tetrasubstituted alpha-amino acids of the family of 1-aminocycloalkane-1-carboxylic acids (Acnc).
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Affiliation(s)
- C Galoppini
- Peptide Synthesis Laboratory, CNR, Institute of Mutagenesis and Differentiation, Via Svezia 2A, I-56124 Pisa, Italy
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42
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Synthesis of (S)-N-tert-butoxycarbonyl-N,O-isopropylidene-α-methylserinal: A potential building block for the asymmetric synthesis of non-natural amino acids. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00937-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Johnson EP, Cantrell, WR, Jenson TM, Miller SA, Parker DJ, Reel NM, Sylvester LG, Szendroi RJ, Vargas KJ, Xu J, Carlson JA. Efficient Large Scale Preparation of Neutral Endopeptidase/Angiotensin-Converting Enzyme Dual Inhibitor CGS30440. Org Process Res Dev 1998. [DOI: 10.1021/op970242s] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Erik P. Johnson
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - William R. Cantrell,
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - Todd M. Jenson
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - Scott A. Miller
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - David J. Parker
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - Noela M. Reel
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - Leo G. Sylvester
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - Robert J. Szendroi
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - Kevin J. Vargas
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - Jean Xu
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
| | - John A. Carlson
- Process Research and Development, Chemical and Analytical Development, Novartis Pharmaceuticals Corporation, 59 Route 10, East Hanover, New Jersey 07936
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