1
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Núñez-Villanueva D, Plata-Ruiz A, Romero-Muñiz I, Martín-Pérez I, Infantes L, González-Muñiz R, Martín-Martínez M. β-Turn Induction by a Diastereopure Azepane-Derived Quaternary Amino Acid. J Org Chem 2023; 88:14688-14696. [PMID: 37774108 PMCID: PMC10594656 DOI: 10.1021/acs.joc.3c01689] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Indexed: 10/01/2023]
Abstract
β-Turns are one of the most common secondary structures found in proteins. In the interest of developing novel β-turn inducers, a diastereopure azepane-derived quaternary amino acid has been incorporated into a library of simplified tetrapeptide models in order to assess the effect of the azepane position and peptide sequence on the stabilization of β-turns. The conformational analysis of these peptides by molecular modeling, NMR spectroscopy, and X-ray crystallography showed that this azepane amino acid is an effective β-turn inducer when incorporated at the i + 1 position. Moreover, the analysis of the supramolecular self-assembly of one of the β-turn-containing peptide models in the solid state reveals that it forms a supramolecular helical arrangement while maintaining the β-turn structure. The results here presented provide the basis for the use of this azepane quaternary amino acid as a strong β-turn inducer in the search for novel peptide-based bioactive molecules, catalysts, and biomaterials.
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Affiliation(s)
| | - Adrián Plata-Ruiz
- Instituto
de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | - Ignacio Romero-Muñiz
- Instituto
de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
- Universidad
Autónoma de Madrid, Química Orgánica, Francisco Tomás y Valiente,
7, 28049 Madrid, Spain
| | - Ignacio Martín-Pérez
- Instituto
de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | - Lourdes Infantes
- Instituto
de Química Física Rocasolano (IQFR-CSIC), Serrano 119, 28006 Madrid, Spain
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2
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Bodenschatz K, Stöckl J, Winterer M, Schobert R. A synthetic approach to 5/5/6-polycyclic tetramate macrolactams of the discodermide type. Tetrahedron 2022. [DOI: 10.1016/j.tet.2021.132113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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3
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Zhang X, Ligny R, Chewchanwuttiwong S, Hadade R, Laurent MY, Martel A, Jacquemmoz C, Lhoste J, Bricaud S, Py S, Dujardin G. δ-Valerolactamic Quaternary Amino Acid Derivatives: Enantiodivergent Synthesis and Evidence for Stereodifferentiated β-Turn-Inducing Properties. J Org Chem 2021; 86:8041-8055. [PMID: 33960779 DOI: 10.1021/acs.joc.1c00456] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Enantiopure (R) and (S) cyclic α,α-disubstituted amino acid derivatives displaying a δ-valerolactam side chain were prepared from a common isoxazolidine precursor. The (R)-configured δ-valerolactam 11 was converted into diastereoisomeric pseudopeptides to investigate its ability to induce secondary structures in peptidomimetics. Conformational studies of these pseudopeptides were carried out in the solid state (X-ray diffraction), in solution (NMR analyses), and in silico (computer-aided conformational analysis), which demonstrated that such quaternary amino acids induce β-turn conformations stable enough to be retained in polar media (DMSO). Incorporation of this new type of α,α-disubstituted amino acid into a representative pseudopeptidic sequence by N- then C-elongation and N-debenzylation is also described herein and could serve for the synthesis of various structured peptidomimetics.
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Affiliation(s)
- Xiaofei Zhang
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France.,Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France.,CNRS, DCM, F-38000 Grenoble, France
| | - Romain Ligny
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
| | - Sopa Chewchanwuttiwong
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France.,Prince of Songkla University, Faculty of Science and Industrial Technology Surat Thani 84000, Thailand
| | - Rawan Hadade
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
| | - Mathieu Y Laurent
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
| | - Arnaud Martel
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
| | - Corentin Jacquemmoz
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
| | - Jérôme Lhoste
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
| | - Sullivan Bricaud
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
| | - Sandrine Py
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France.,CNRS, DCM, F-38000 Grenoble, France
| | - Gilles Dujardin
- Institut des Molécules et Matériaux du Mans (IMMM) - UMR 6283 CNRS-Le Mans Université, Equipe Méthodologie et Synthèse Organique, F-72085 Le Mans Cedex 09, France
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4
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Bucci R, Foschi F, Loro C, Erba E, Gelmi ML, Pellegrino S. Fishing in the Toolbox of Cyclic Turn Mimics: a Literature Overview of the Last Decade. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100244] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Raffaella Bucci
- Dipartimento di Scienze farmaceutiche,DISFARM Università degli Studi di Milano Via Venezian 21 Milano 20133 Italy
| | - Francesca Foschi
- Dipartimento di Scienze e Alta Tecnologie,DiSAT Università degli Studi dell'Insubria Via Valleggio 9 Como 20100 Italy
| | - Camilla Loro
- Dipartimento di Scienze e Alta Tecnologie,DiSAT Università degli Studi dell'Insubria Via Valleggio 9 Como 20100 Italy
| | - Emanuela Erba
- Dipartimento di Scienze farmaceutiche,DISFARM Università degli Studi di Milano Via Venezian 21 Milano 20133 Italy
| | - Maria Luisa Gelmi
- Dipartimento di Scienze farmaceutiche,DISFARM Università degli Studi di Milano Via Venezian 21 Milano 20133 Italy
| | - Sara Pellegrino
- Dipartimento di Scienze farmaceutiche,DISFARM Università degli Studi di Milano Via Venezian 21 Milano 20133 Italy
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5
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Tao Y, Lall MS, Boyles DC, Lilley SC, Pattavina SD, Rafka RJ, Sitter BJ, Stewart AM, Szeliga J, Weisenburger GA. Enabled Process To Synthesize Monobactam 1 for Early Development. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.9b00374] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Yong Tao
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Manjinder S. Lall
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - David C. Boyles
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Susan C. Lilley
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Sebastian D. Pattavina
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Robert J. Rafka
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Barbara J. Sitter
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Andrew Morgan Stewart
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Jan Szeliga
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Gerald A. Weisenburger
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
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6
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Abstract
The β-lactams constitute a well-known class of compounds having tremendous biological significance. Besides being a motif of biological interest, they serve as versatile synthons in organic chemistry. In fact, their easy accessibility in the laboratory by several methods combined with inherent reactivity of the β -lactam ring due to ring-strain places it among the most sought for substrate in the arsenal of synthetic organic chemists. Several chemical reagents, heat, and light promote its ring-opening, ring-expansions and rearrangement reactions yielding a wide variety of biologically relevant nitrogen-containing acyclic and heterocyclic compounds. In recent years, the reactivity of differently functionalized β-lactam rings towards diverse kinds of reagents has been investigated. These investigations exploit selective bond cleavage of the β-lactam nucleus via N1-C2, C3- C4, C2-C3 or N1-C4 bond cleavage using simple reagents. The reduction of amide carbonyl group, thionation, and pyrolysis/photolysis have also been explored. These investigations have led to the discovery of many easy synthetic methods for biologically important classes of compounds such as β-amino acids, β-amino esters, amino sugars, amino alcohols, peptides, azetidines, and other heterocyclic compounds. This article discusses the advances made in the studies on the reactivity of β- lactam ring during the last ten years.
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Affiliation(s)
- Japheth O. Ombito
- Chemistry Department, University of Botswana, P. Bag: 0022, Gaborone, Botswana
| | - Girija S. Singh
- Chemistry Department, University of Botswana, P. Bag: 0022, Gaborone, Botswana
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7
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Zha GF, Rakesh K, Manukumar H, Shantharam C, Long S. Pharmaceutical significance of azepane based motifs for drug discovery: A critical review. Eur J Med Chem 2019; 162:465-494. [DOI: 10.1016/j.ejmech.2018.11.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/13/2018] [Accepted: 11/09/2018] [Indexed: 12/11/2022]
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8
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Csomós P, Fodor L, Csámpai A, Sohár P. A useful ring transformation route to novel thiazepino[7,6- b ]indoles from monochloro-β-lactam-fused 1,3-thiazino[6,5- b ]indoles, analogues of cyclobrassinin. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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9
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Wang ZA, Ding XZ, Tian CL, Zheng JS. Protein/peptide secondary structural mimics: design, characterization, and modulation of protein–protein interactions. RSC Adv 2016. [DOI: 10.1039/c6ra13976k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This review discusses general aspects of novel artificial peptide secondary structure mimics for modulation of PPIs, their therapeutic applications and future prospects.
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Affiliation(s)
- Zhipeng A. Wang
- School of Life Sciences
- University of Science and Technology of China
- Hefei 230026
- China
- Department of Chemistry
| | - Xiaozhe Z. Ding
- School of Life Sciences
- Tsinghua University
- Beijing 100084
- China
- Department of Bioengineering
| | - Chang-Lin Tian
- School of Life Sciences
- University of Science and Technology of China
- Hefei 230026
- China
| | - Ji-Shen Zheng
- School of Life Sciences
- University of Science and Technology of China
- Hefei 230026
- China
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10
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Patel AR, Bhadbhade MM, Liu F. Crystal structure of (4R,5S,6R)-6-azido-5-benz-yloxy-3,3,4-tri-fluoro-azepan-1-ium 2,2,2-tri-fluoro-acetate from synchrotron data. Acta Crystallogr E Crystallogr Commun 2015; 71:1361-5. [PMID: 26594511 PMCID: PMC4645019 DOI: 10.1107/s2056989015019416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 10/14/2015] [Indexed: 11/10/2022]
Abstract
The structure of the title compound, C15H16F6N4O3, was determined using synchrotron radiation on an extremely small crystal (0.015 × 0.01 × 0.01 mm). Although the diffraction was weak, leading to high residuals and a poor data-to-parameter ratio, the data allowed ready solution and refinement to reveal the entire structure. The solid-state structure is in accordance with the absolute configuration assigned based on that of the known starting material. The compound comprises a highly substituted seven-membered N-heterocyclic cation and a tri-fluoro-methane-sulfonate counter-anion. The title compound crystallizes with two independent cations (A and B) and anions (C and D) in the asymmetric unit. Two geminal F atoms, a single F atom, a benzyl ether and an azide group are substituted on consecutive C atoms between the NH2 and CH2 units of the azepan-1-ium ring system. The seven-membered rings adopt different conformations with the principal differences occurring in the CF2CHFCH2 segments of the ring systems. The geminal F atoms on the quaternary C atom exhibit essentially identical bond angles [109 (2) and 106 (2)°] in the two independent mol-ecules. The two mol-ecules associate as a dimeric unit via two C-H⋯F inter-actions. An extensive series of N-H⋯O, N-H⋯F, C-H⋯O, C-H⋯N, C-H⋯F and C-H⋯π contacts generate a three-dimensional network with cations and anions linked into ABCD repeat columns along a.
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Affiliation(s)
- Alpesh Ramanlal Patel
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Mohan M. Bhadbhade
- Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, 2052 NSW, Australia
| | - Fei Liu
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
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11
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Kumar V, Klimovica K, Rasina D, Jirgensons A. 2-Vinyl Threoninol Derivatives via Acid-Catalyzed Allylic Substitution of Bisimidates. J Org Chem 2015; 80:5934-43. [PMID: 25941908 DOI: 10.1021/acs.joc.5b00529] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A diastereoselective synthesis of 4-vinyl oxazolines syn-2 was developed based on an acid-catalyzed cyclization of bistrichloroacetimidates (E)-1. The reaction likely involves an allyl carbenium ion intermediate in which the adjacent stereocenter directs the stereoselectivity for C-N bond formation. Oxazolines syn-2 were transformed to C-quaternary threoninol, threoninal, and threonine derivatives which can be further incorporated into complex natural compounds.
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Affiliation(s)
- Varun Kumar
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
| | - Kristine Klimovica
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
| | - Dace Rasina
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
| | - Aigars Jirgensons
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
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12
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Singh P, Samanta K, Das SK, Panda G. Amino acid chirons: a tool for asymmetric synthesis of heterocycles. Org Biomol Chem 2015; 12:6297-339. [PMID: 24989176 DOI: 10.1039/c4ob00943f] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As a result of their easy availability in enantiomerically enriched form and their possession of synthetically transformable diverse functional groups, amino acids have been extensively used by synthetic organic and medicinal chemists as a chiral pool for access to heterocycles (monocycles, bicycles or polycycles, either bridged or fused). This review describes the syntheses of diverse asymmetric heterocycles with various membered rings (n = 3-9) followed by benzo or heteroannulated ones, for the period from 1996 to Dec. 2013. It details solution phase synthetic methodologies in which the naturally occurring α-amino acid is incorporated, totally or partially, into the final product.
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Affiliation(s)
- Priyanka Singh
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, B.S. 10/1, Jankipuram Extension, Sitapur Road, Lucknow 226031, India.
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13
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Núñez-Villanueva D, García-López MT, Martín-Martínez M, González-Muñiz R. Divergent, stereoselective access to heterocyclic α,α-quaternary- and β(2,3,3)-amino acid derivatives from a N-Pmp-protected Orn-derived β-lactam. Org Biomol Chem 2015; 13:5195-201. [PMID: 25849279 DOI: 10.1039/c5ob00429b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A suitably protected Orn-derived (3S,4S)-β-lactam was used as common intermediate in the synthesis of conformationally constrained (3S,4S)-2-oxoazepane α,α- and (2S,3S)-2-oxopiperidine-β(2,3,3)-amino acid derivatives. Compared to alternative procedures using an N-p-methoxybenzyl group at the 2-azetidinone, the incorporation of a p-methoxyphenyl moiety is crucial for the excellent stereochemical outcomes in the preparation of these heterocyclic amino acids. Chemoselective 7- or 6-exo-trig cyclization was achieved through alternative sequences of Pmp-deprotection/Boc-activation, followed by inter- and intramolecular β-lactam ring opening, respectively.
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14
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Pellegrino S, Bonetti A, Clerici F, Contini A, Moretto A, Soave R, Gelmi ML. 1H-Azepine-2-oxo-5-amino-5-carboxylic Acid: A 310 Helix Inducer and an Effective Tool for Functionalized Gold Nanoparticles. J Org Chem 2015; 80:5507-16. [DOI: 10.1021/acs.joc.5b00396] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Sara Pellegrino
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Andrea Bonetti
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Francesca Clerici
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Alessandro Contini
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
| | - Alessandro Moretto
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, Via
Marzolo 1 35131, Padova, Italy
| | - Raffaella Soave
- CNR- Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19 20133, Milano, Italy
| | - Maria Luisa Gelmi
- Dipartimento
di Scienze Farmaceutiche- Sezione di Chimica Generale e Organica-
“A. Marchesini” Università degli Studi di Milano, Via Venezian 21 20133, Milano, Italy
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15
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Núñez-Villanueva D, Bonache MÁ, Lozano L, Infantes L, Elguero J, Alkorta I, García-López MT, González-Muñiz R, Martín-Martínez M. Experimental and theoretical studies on the rearrangement of 2-oxoazepane α,α-amino acids into 2'-oxopiperidine β(2,3,3) -amino acids: an example of intramolecular catalysis. Chemistry 2015; 21:2489-500. [PMID: 25522111 DOI: 10.1002/chem.201405640] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Indexed: 11/07/2022]
Abstract
Enantiopure β-amino acids represent interesting scaffolds for peptidomimetics, foldamers and bioactive compounds. However, the synthesis of highly substituted analogues is still a major challenge. Herein, we describe the spontaneous rearrangement of 4-carboxy-2-oxoazepane α,α-amino acids to lead to 2'-oxopiperidine-containing β(2,3,3) -amino acids, upon basic or acid hydrolysis of the 2-oxoazepane α,α-amino acid ester. Under acidic conditions, a totally stereoselective synthetic route has been developed. The reordering process involved the spontaneous breakdown of an amide bond, which typically requires strong conditions, and the formation of a new bond leading to the six-membered heterocycle. A quantum mechanical study was carried out to obtain insight into the remarkable ease of this rearrangement, which occurs at room temperature, either in solution or upon storage of the 4-carboxylic acid substituted 2-oxoazepane derivatives. This theoretical study suggests that the rearrangement process occurs through a concerted mechanism, in which the energy of the transition states can be lowered by the participation of a catalytic water molecule. Interestingly, it also suggested a role for the carboxylic acid at position 4 of the 2-oxoazepane ring, which facilitates this rearrangement, participating directly in the intramolecular catalysis.
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16
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Lesma G, Meneghetti F, Sacchetti A, Stucchi M, Silvani A. Asymmetric Ugi 3CR on isatin-derived ketimine: synthesis of chiral 3,3-disubstituted 3-aminooxindole derivatives. Beilstein J Org Chem 2014; 10:1383-9. [PMID: 24991292 PMCID: PMC4077467 DOI: 10.3762/bjoc.10.141] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Accepted: 05/19/2014] [Indexed: 12/23/2022] Open
Abstract
An efficient Ugi three-component reaction of a preformed chiral ketimine derived from isatin with various isonitrile and acid components has been developed. The reactions proceeded smoothly and in a stereocontrolled manner with regard to the new center of the Ugi products due to the stereoinduction of the amine chiral residue. A wide variety of novel chiral 3,3-disubstituted 3-aminooxindoles were obtained, a selection of which were subjected to post-Ugi transformations, paving the way to application as peptidomimetics.
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Affiliation(s)
- Giordano Lesma
- Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi, 19, 20133 Milano (Italy)
| | - Fiorella Meneghetti
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, via L. Mangiagalli 25, 20133 Milano, Italy
| | - Alessandro Sacchetti
- Dipartimento di Chimica, Materiali e Ingegneria Chimica 'Giulio Natta', Politecnico di Milano, p.zza Leonardo da Vinci 32, 20133 Milano, Italy
| | - Mattia Stucchi
- Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi, 19, 20133 Milano (Italy)
| | - Alessandra Silvani
- Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi, 19, 20133 Milano (Italy)
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17
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18
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Patel AR, Hunter L, Bhadbhade MM, Liu F. Conformational Regulation of Substituted Azepanes through Mono-, Di-, and Trifluorination. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301811] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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19
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Lesma G, Cecchi R, Cagnotto A, Gobbi M, Meneghetti F, Musolino M, Sacchetti A, Silvani A. Tetrahydro-β-carboline-based spirocyclic lactam as type II' β-turn: application to the synthesis and biological evaluation of somatostatine mimetics. J Org Chem 2013; 78:2600-10. [PMID: 23409740 DOI: 10.1021/jo302737j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The synthesis of novel spirocyclic lactams, embodying D-tryptophan (Trp) amino acid as the central core and acting as peptidomimetics, is presented. It relies on the strategic combination of Seebach's self-reproduction of chirality chemistry and Pictet-Spengler condensation as key steps. Investigation of the conformational behavior by molecular modeling, X-ray crystallography, and NMR and IR spectroscopies suggests very stable and highly predictable type II' β-turn conformations for all compounds. Relying on this feature, we also pursued their application to two potential mimetics of the hormone somatostatin, a pharmaceutically relevant natural peptide, which contains a Trp-based type II' β-turn pharmacophore.
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Affiliation(s)
- Giordano Lesma
- Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi 19, 20133 Milano, Italy
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Giorgi G, Favi G, Attanasi OA. Insights into diastereoisomeric characterization of tetrahydropyridazine amino acid derivatives: crystal structures and gas phase ion chemistry. Org Biomol Chem 2013; 11:5006-11. [DOI: 10.1039/c3ob41034j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Patel AR, Ball G, Hunter L, Liu F. Conformational regulation of substituted azepanes through selective monofluorination. Org Biomol Chem 2013; 11:3781-5. [DOI: 10.1039/c3ob40391b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Haya L, Osante I, Mainar AM, Cativiela C, Urieta JS. Intramolecular hydrogen-bonding activation in cysteines: a new effective radical scavenger. Phys Chem Chem Phys 2013; 15:9407-13. [DOI: 10.1039/c3cp50743b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Núñez-Villanueva D, Infantes L, García-López MT, González-Muñiz R, Martín-Martínez M. Azepane Quaternary Amino Acids As Effective Inducers of 310 Helix Conformations. J Org Chem 2012; 77:9833-9. [DOI: 10.1021/jo301379r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Lourdes Infantes
- Instituto de Química Física Rocasolano (IQFR-CSIC), Serrano 119, 28006
Madrid, Spain
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Pellegrino S, Contini A, Clerici F, Gori A, Nava D, Gelmi ML. 1H-Azepine-4-amino-4-carboxylic acid: a new α,α-disubstituted ornithine analogue capable of inducing helix conformations in short Ala-Aib pentapeptides. Chemistry 2012; 18:8705-15. [PMID: 22689465 DOI: 10.1002/chem.201104023] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 03/30/2012] [Indexed: 11/08/2022]
Abstract
A very efficient synthesis of orthogonally protected 1H-azepine-4-amino-4-carboxylic acid, abbreviated as Azn, a conformationally restricted analogue of ornithine, was realized. It was obtained on a gram scale in good overall yield in five steps, three of which did not require isolation of the intermediates, starting from the readily available 1-amino-4-oxo-cyclohexane-4-carboxylic acid. Both enantiomers were used for the preparation of pentapeptide models containing Ala, Aib, and Azn. Conformational studies using both spectroscopic techniques (NMR, CD) and molecular dynamics on model 5-mer peptides showed that the (R)-Azn isomer possesses a marked helicogenic effect.
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Affiliation(s)
- Sara Pellegrino
- DISMAB, Sezione di Chimica Organica A. Marchesini, Facoltà di Farmacia, Università degli Studi Milano, Via Venezian 21, 20133 Milano, Italy.
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Ryan JH, Hyland C, Meyer AG, Smith JA, Yin J. Seven-Membered Rings. PROGRESS IN HETEROCYCLIC CHEMISTRY 2012. [DOI: 10.1016/b978-0-08-096807-0.00016-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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