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Gupta N, Wilczek M, Dobrzycki L, Pulka-Ziach K. Structural Consequences of N‐methylation of N‐terminus in Oligourea Foldamers. Chempluschem 2022; 87:e202200199. [DOI: 10.1002/cplu.202200199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/22/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Naveen Gupta
- University of Warsaw: Uniwersytet Warszawski Faculty of Chemistry Pastuera 1 02-093 Warsaw POLAND
| | - Marcin Wilczek
- University of Warsaw: Uniwersytet Warszawski Faculty of Chemistry Pasteura 1 02-093 Warsaw POLAND
| | - Lukasz Dobrzycki
- University of Warsaw: Uniwersytet Warszawski Faculty of Chemistry Zwirki i Wigury 101 02-089 Warsaw POLAND
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2
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Bag SS, De S, Bhuyan S. Intramolecular cyclization of isothiocyanyl amino acids/peptide: arrival at unnatural thioxoimidazolidinyl/thioxooxazolidinyl amino acids. Amino Acids 2022; 54:1451-1459. [DOI: 10.1007/s00726-022-03186-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 06/28/2022] [Indexed: 11/24/2022]
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3
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Lai Z, Yuan X, Chen H, Zhu Y, Dong N, Shan A. Strategies employed in the design of antimicrobial peptides with enhanced proteolytic stability. Biotechnol Adv 2022; 59:107962. [PMID: 35452776 DOI: 10.1016/j.biotechadv.2022.107962] [Citation(s) in RCA: 61] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 03/14/2022] [Accepted: 04/13/2022] [Indexed: 12/12/2022]
Abstract
Due to the alarming developing rate of multidrug-resistant bacterial pathogens, the development and modification of antimicrobial peptides (AMPs) are unprecedentedly active. Despite the fact that considerable efforts have been expended on the discovery and design strategies of AMPs, the clinical translation of peptide antibiotics remains inadequate. A large number of articles and reviews credited the limited success of AMPs to their poor stability in the biological environment, particularly their poor proteolytic stability. In the past forty years, various design strategies have been used to improve the proteolytic stability of AMPs, such as sequence modification, cyclization, peptidomimetics, and nanotechnology. Herein, we focus our discussion on the progress made in improving the proteolytic stability of AMPs and the principle, successes, and limitations of various anti-proteolytic design strategies. It is of prospective significance to extend current insights into the degradation-related inactivation of AMPs and also alleviate/overcome the problem.
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Affiliation(s)
- Zhenheng Lai
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Xiaojie Yuan
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Hongyu Chen
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Yunhui Zhu
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Na Dong
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Anshan Shan
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China.
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4
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López R, Palomo C. N,N-Diacylaminals as Emerging Tools in Synthesis: From Peptidomimetics to Asymmetric Catalysis. Chemistry 2021; 27:20-29. [PMID: 32667706 DOI: 10.1002/chem.202002637] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 07/12/2020] [Indexed: 12/26/2022]
Abstract
N,N-Diacylaminals are flexible molecular scaffolds that have commonly been utilized as amide surrogates in peptidomimetics. The singularities of this motif as an N-acyl imine equivalent and as hydrogen-bond donor have recently opened new synthetic opportunities, especially in the field of asymmetric catalysis. This concept article highlights this diverse synthetic potential and provides the elements necessary for further developments.
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Affiliation(s)
- Rosa López
- Departamento de Química Orgánica I, Facultad de Química, Universidad del País Vasco (UPV/EHU), Manuel de Lardizabal 3, 20018, San Sebastián, Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I, Facultad de Química, Universidad del País Vasco (UPV/EHU), Manuel de Lardizabal 3, 20018, San Sebastián, Spain
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5
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Bag SS, De S. Isothiocyanyl Alanine as a Synthetic Intermediate for the Synthesis of Thioureayl Alanines and Subsequent Aminotetrazolyl Alanines. J Org Chem 2017; 82:12276-12285. [PMID: 29065260 DOI: 10.1021/acs.joc.7b02103] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The synthesis of unnatural amino acids with small side-chain functionalities usable for further transformations is highly demanding for the expansion of the genetic code and other possible biotechnological applications. To this end, we wanted to report the utility of an unexplored unnatural amino acid, isothiocyanyl alanine (NCSAla = Ita), for the synthesis of another class of unnatural amino acids, thioureayl alanines (TUAla = Tua). The synthesis of a third class of unnatural amino acids, amino tetrazolyl alanines (ATzAla = Ata), in a very good yield was subsequently achieved utilizing thioureayl alanines. Thus, a variety of aliphatic- and aromatic-substituted thioureayl alanines and aromatic-substituted amino tetrazolyl alanines were successfully synthesized in good to excellent yields. The photophysical properties of three of the fluorescent unnatural amino acids from two classes were also studied and presented herein.
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Affiliation(s)
- Subhendu Sekhar Bag
- Bioorganic Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati 781039, India
| | - Suranjan De
- Bioorganic Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati 781039, India
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6
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Konnert L, Lamaty F, Martinez J, Colacino E. Recent Advances in the Synthesis of Hydantoins: The State of the Art of a Valuable Scaffold. Chem Rev 2017. [PMID: 28644621 DOI: 10.1021/acs.chemrev.7b00067] [Citation(s) in RCA: 117] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The review highlights the hydantoin syntheses presented from the point of view of the preparation methods. Novel synthetic routes to various hydantoin structures, the advances brought to the classical methods in the aim of producing more sustainable and environmentally friendly procedures for the preparation of these biomolecules, and a critical comparison of the different synthetic approaches developed in the last twelve years are also described. The review is composed of 95 schemes, 8 figures and 528 references for the last 12 years and includes the description of the hydantoin-based marketed drugs and clinical candidates.
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Affiliation(s)
- Laure Konnert
- Université de Montpellier, Institut des Biomolécules Max Mousseron UMR 5247 CNRS - Universités Montpellier - ENSCM , Place E. Bataillon, Campus Triolet, cc 1703, 34095 Montpellier, France
| | - Frédéric Lamaty
- Université de Montpellier, Institut des Biomolécules Max Mousseron UMR 5247 CNRS - Universités Montpellier - ENSCM , Place E. Bataillon, Campus Triolet, cc 1703, 34095 Montpellier, France
| | - Jean Martinez
- Université de Montpellier, Institut des Biomolécules Max Mousseron UMR 5247 CNRS - Universités Montpellier - ENSCM , Place E. Bataillon, Campus Triolet, cc 1703, 34095 Montpellier, France
| | - Evelina Colacino
- Université de Montpellier, Institut des Biomolécules Max Mousseron UMR 5247 CNRS - Universités Montpellier - ENSCM , Place E. Bataillon, Campus Triolet, cc 1703, 34095 Montpellier, France
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7
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Chen Z, Cao Y, Tian Z, Zhou X, Xu W, Yang J, Teng H. An efficient reduction of N -substituted carbonylimidazolides into formamides by NaBH 4. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.04.072] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Verardo G, Gorassini A. Sodium Borohydride Reduction of Carbamoyl Azide Function: A Synthesis of N-Protected N′-Formyl- gem-diaminoalkyl Derivatives. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300442] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Wojno J, Jukes JP, Ghadbane H, Shepherd D, Besra GS, Cerundolo V, Cox LR. Amide analogues of CD1d agonists modulate iNKT-cell-mediated cytokine production. ACS Chem Biol 2012; 7:847-55. [PMID: 22324848 PMCID: PMC3409616 DOI: 10.1021/cb2005017] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Invariant natural killer T (iNKT) cells
are restricted
by the non-polymorphic MHC class I-like protein, CD1d, and activated
following presentation of lipid antigens bound to CD1d molecules.
The prototypical iNKT cell agonist is α-galactosyl
ceramide (α-GalCer). CD1d-mediated activation of iNKT cells by this molecule results in the rapid secretion of a range
of pro-inflammatory (Th1) and regulatory (Th2) cytokines. Polarization
of the cytokine response can be achieved by modifying the structure
of the glycolipid, which opens up the possibility of using CD1d agonists
as therapeutic agents for a range of diseases. Analysis of crystal
structures of the T-cell receptor−α-GalCer–CD1d
complex led us to postulate that amide isosteres of known CD1d agonists
should modulate the cytokine response profile upon iNKT-cell activation. To this end, we describe the synthesis and biological
activity of amide analogues of α-GalCer and its non-glycosidic
analogue threitol ceramide (ThrCer). All of the analogues were found
to stimulate murine and human iNKT cells by CD1d-mediated
presentation to varying degrees; however, the thioamide and carbamate
analogues of ThrCer were of particular interest in that they elicited
a strongly polarized cytokine response (more interferon-gamma (IFN-γ),
no interleukin-4 (IL-4)) in mice. While the ThrCer-carbamate analogue
was shown to transactivate natural killer (NK) cells, a mechanism
that has been used to account for the preferential production of IFN-γ
by other CD1d agonists, this pathway does not account for the polarized
cytokine response observed for the thioamide analogue.
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Affiliation(s)
| | - John-Paul Jukes
- Medical Research Council Human
Immunology Unit, Nuffield Department of Medicine, Weatherall Institute
of Molecular Medicine, University of Oxford, Oxford OX3 9DS, U.K
| | - Hemza Ghadbane
- Medical Research Council Human
Immunology Unit, Nuffield Department of Medicine, Weatherall Institute
of Molecular Medicine, University of Oxford, Oxford OX3 9DS, U.K
| | - Dawn Shepherd
- Medical Research Council Human
Immunology Unit, Nuffield Department of Medicine, Weatherall Institute
of Molecular Medicine, University of Oxford, Oxford OX3 9DS, U.K
| | | | - Vincenzo Cerundolo
- Medical Research Council Human
Immunology Unit, Nuffield Department of Medicine, Weatherall Institute
of Molecular Medicine, University of Oxford, Oxford OX3 9DS, U.K
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Venneri CD, Verardo G, Strazzolini P. Simple and Mild One-Pot Synthesis of Dipeptidyl Ureas via Carbamoyl Azides of α- N-Protected Amino Acids. SYNTHETIC COMMUN 2011. [DOI: 10.1080/00397911003710570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
| | - Giancarlo Verardo
- a Department of Chemical Sciences and Technology , University of Udine , Udine , Italy
| | - Paolo Strazzolini
- a Department of Chemical Sciences and Technology , University of Udine , Udine , Italy
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12
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Lozano JM, Lesmes LP, Carreño LF, Gallego GM, Patarroyo ME. Development of designed site-directed pseudopeptide-peptido-mimetic immunogens as novel minimal subunit-vaccine candidates for malaria. Molecules 2010; 15:8856-89. [PMID: 21135800 PMCID: PMC6259129 DOI: 10.3390/molecules15128856] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2010] [Accepted: 10/28/2010] [Indexed: 11/16/2022] Open
Abstract
Synthetic vaccines constitute the most promising tools for controlling and preventing infectious diseases. When synthetic immunogens are designed from the pathogen native sequences, these are normally poorly immunogenic and do not induce protection, as demonstrated in our research. After attempting many synthetic strategies for improving the immunogenicity properties of these sequences, the approach consisting of identifying high binding motifs present in those, and then performing specific changes on amino-acids belonging to such motifs, has proven to be a workable strategy. In addition, other strategies consisting of chemically introducing non-natural constraints to the backbone topology of the molecule and modifying the α-carbon asymmetry are becoming valuable tools to be considered in this pursuit. Non-natural structural constraints to the peptide backbone can be achieved by introducing peptide bond isosters such as reduced amides, partially retro or retro-inverso modifications or even including urea motifs. The second can be obtained by strategically replacing L-amino-acids with their enantiomeric forms for obtaining both structurally site-directed designed immunogens as potential vaccine candidates and their Ig structural molecular images, both having immuno-therapeutic effects for preventing and controlling malaria.
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MESH Headings
- Animals
- Haplorhini
- Humans
- Malaria Vaccines/chemical synthesis
- Malaria Vaccines/chemistry
- Malaria Vaccines/immunology
- Malaria Vaccines/pharmacology
- Malaria, Falciparum/immunology
- Malaria, Falciparum/prevention & control
- Mice
- Mice, Inbred BALB C
- Peptidomimetics/chemical synthesis
- Peptidomimetics/chemistry
- Peptidomimetics/immunology
- Peptidomimetics/pharmacology
- Vaccines, Subunit/chemical synthesis
- Vaccines, Subunit/chemistry
- Vaccines, Subunit/immunology
- Vaccines, Subunit/pharmacology
- Vaccines, Synthetic/chemistry
- Vaccines, Synthetic/immunology
- Vaccines, Synthetic/pharmacology
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Affiliation(s)
- José Manuel Lozano
- Fundación Instituto de Inmunología de Colombia (FIDIC), Universidad del Rosario and Universidad Nacional de Colombia, Bogotá DC, Colombia.
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Chennakrishnareddy G, Nagendra G, Hemantha HP, Das U, Guru Row TN, Sureshbabu VV. Isoselenocyanates derived from Boc/Z-amino acids: synthesis, isolation, characterization, and application to the efficient synthesis of unsymmetrical selenoureas and selenoureidopeptidomimetics. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.06.082] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Sureshbabu VV, Lalithamba HS, Narendra N, Hemantha HP. New and simple synthesis of acid azides, ureas and carbamates from carboxylic acids: application of peptide coupling agents EDC and HBTU. Org Biomol Chem 2010; 8:835-40. [DOI: 10.1039/b920290k] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Sureshbabu VV, Naik SA, Hemantha HP, Narendra N, Das U, Guru Row TN. N-Urethane-Protected Amino Alkyl Isothiocyanates: Synthesis, Isolation, Characterization, and Application to the Synthesis of Thioureidopeptides. J Org Chem 2009; 74:5260-6. [DOI: 10.1021/jo900675s] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vommina V. Sureshbabu
- Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus, Bangalore University, Dr. B. R. Ambedkar Veedhi, Bangalore 560 001, India
| | - Shankar A. Naik
- Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus, Bangalore University, Dr. B. R. Ambedkar Veedhi, Bangalore 560 001, India
| | - H. P. Hemantha
- Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus, Bangalore University, Dr. B. R. Ambedkar Veedhi, Bangalore 560 001, India
| | - N. Narendra
- Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus, Bangalore University, Dr. B. R. Ambedkar Veedhi, Bangalore 560 001, India
| | - Ushati Das
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
| | - Tayur N. Guru Row
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
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Fischer L, Decossas M, Briand JP, Didierjean C, Guichard G. Control of Duplex Formation and Columnar Self-Assembly with Heterogeneous Amide/Urea Macrocycles. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200804019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Fischer L, Decossas M, Briand JP, Didierjean C, Guichard G. Control of Duplex Formation and Columnar Self-Assembly with Heterogeneous Amide/Urea Macrocycles. Angew Chem Int Ed Engl 2009; 48:1625-8. [DOI: 10.1002/anie.200804019] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fischer L, Lena G, Briand JP, Didierjean C, Guichard G. Mixing Urea and Amide Bonds: Synthesis and Self-Organization of New Hybrid Oligomers. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009; 611:39-40. [DOI: 10.1007/978-0-387-73657-0_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Narendra N, Chennakrishnareddy G, Sureshbabu VV. Application of carbodiimide mediated Lossen rearrangement for the synthesis of α-ureidopeptides and peptidyl ureas employing N-urethane α-amino/peptidyl hydroxamic acids. Org Biomol Chem 2009; 7:3520-6. [DOI: 10.1039/b905790k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Ávalos M, Babiano R, Cintas P, Gómez-Carretero A, Jiménez J, Lozano M, Ortiz A, Palacios J, Pinazo A. A Family of Hydrogels Based on Ureido-Linked Aminopolyol-Derived Amphiphiles and Bolaamphiphiles: Synthesis, Gelation under Thermal and Sonochemical Stimuli, and Mesomorphic Characterization. Chemistry 2008; 14:5656-69. [DOI: 10.1002/chem.200701897] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Fischer L, Didierjean C, Jolibois F, Semetey V, Manuel Lozano J, Briand JP, Marraud M, Poteau R, Guichard G. Propensity for local folding induced by the urea fragment in short-chain oligomers. Org Biomol Chem 2008; 6:2596-610. [PMID: 18600281 DOI: 10.1039/b801139g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Examination of local folding and H-bonding patterns in model compounds can be extremely informative to gain insight into the propensity of longer-chain oligomers to adopt specific folding patterns (i.e. foldamers) based on remote interactions. Using a combination of experimental techniques (i.e. X-ray diffraction, FT-IR absorption and NMR spectroscopy) and theoretical calculations at the density functional theory (DFT) level, we have examined the local folding patterns induced by the urea fragment in short-chain aza analogues of beta- and gamma-amino acid derivatives. We found that the urea-turn, a robust C(8) conformation based on 1<--3 H-bond interaction, is largely populated in model ureidopeptides (I-IV) obtained by replacing the alpha-carbon of a beta-amino acid by a nitrogen. This H-bonding scheme is likely to compete with remote H-bond interactions, thus preventing the formation of secondary structures based on remote intrastrand interactions in longer oligomers. In related oligomers obtained by the addition of a methylene in the main chain (V-VIII), nearest-neighbour H-bonded interactions are unfavourable i.e. the corresponding C9 folding pattern is hardly populated. In this series, folding based on remote intrastrand interactions becomes possible for longer oligomers. We present spectroscopic evidence that tetraurea VIII is likely to be the smallest unit capable of reproducing the H-bonded motif found in 2.5-helical N,N'-linked oligoureas.
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Affiliation(s)
- Lucile Fischer
- CNRS, Institut de Biologie Moléculaire et Cellulaire, Immunologie et Chimie Thérapeutiques, 15, rue Descartes, F-67000, Strasbourg, France
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Sureshbabu VV, Narendra N. Synthesis of N-Z, N′-Formyl α-Amino Acid Derived Gem-Diamines. Int J Pept Res Ther 2008. [DOI: 10.1007/s10989-008-9127-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Violette A, Lancelot N, Poschalko A, Piotto M, Briand JP, Raya J, Elbayed K, Bianco A, Guichard G. Exploring Helical Folding of Oligoureas During Chain Elongation by High-Resolution Magic-Angle-Spinning (HRMAS) NMR Spectroscopy. Chemistry 2008; 14:3874-82. [DOI: 10.1002/chem.200701923] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Sureshbabu VV, Chennakrishnareddy G, Narendra N. A facile and one-pot synthesis of Nα-Fmoc/Bsmoc/Boc/Z-protected ureidopeptides and peptidyl ureas employing diphenylphosphoryl azide [DPPA]. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.12.060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Clavé G, Boutal H, Hoang A, Perraut F, Volland H, Renard PY, Romieu A. A novel heterotrifunctional peptide-based cross-linking reagent for facile access to bioconjugates. Applications to peptide fluorescent labelling and immobilisation. Org Biomol Chem 2008; 6:3065-78. [DOI: 10.1039/b807263a] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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26
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Sudarshan NS, Narendra N, Hemantha HP, Sureshbabu VV. An Efficient Conversion of the Carboxylic Group of N-Fmoc α-Amino Acids/Peptide Acids into N-Formamides Employing Isocyanates as Key Intermediates. J Org Chem 2007; 72:9804-7. [DOI: 10.1021/jo701371k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. S. Sudarshan
- Department of Studies in Chemistry, Central College Campus, Bangalore University, Bangalore 560001, India
| | - N. Narendra
- Department of Studies in Chemistry, Central College Campus, Bangalore University, Bangalore 560001, India
| | - H. P. Hemantha
- Department of Studies in Chemistry, Central College Campus, Bangalore University, Bangalore 560001, India
| | - Vommina V. Sureshbabu
- Department of Studies in Chemistry, Central College Campus, Bangalore University, Bangalore 560001, India
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27
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Suresh Babu VV, Sudarshan NS, Naik SA. Synthesis of Ureidopeptides and Peptidyl Ureas Employing Bsmoc Chemistry. Int J Pept Res Ther 2007. [DOI: 10.1007/s10989-007-9117-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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Fischer L, Semetey V, Lozano JM, Schaffner AP, Briand JP, Didierjean C, Guichard G. Succinimidyl Carbamate Derivatives fromN-Protected α-Amino Acids and Dipeptides―Synthesis of Ureidopeptides and Oligourea/Peptide Hybrids. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700541] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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