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N-Terminal guanidine derivatives of teicoplanin antibiotics strongly active against glycopeptide resistant Enterococcus faecium. J Antibiot (Tokyo) 2020; 73:603-614. [PMID: 32409678 DOI: 10.1038/s41429-020-0313-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/26/2020] [Accepted: 04/15/2020] [Indexed: 01/18/2023]
Abstract
Antibiotic resistance is one of the major challenges in healthcare of our time. To meet this challenge, we designed and prepared guanidine and lipophilic guanidine derivatives of the glycopeptide antibiotic teicoplanin to armed them with activity against the most threatening nosocomial bacteria, multiresistant enterococci. From teicoplanin and its pseudoaglycone, a series of N-terminal guanidine derivatives have been prepared with free and amide C-terminal parts. Six aliphatic and aromatic lipophilic carbodiimides were prepared and used for the synthesis of lipophilic guanidine teicoplanin conjugates. All new N-terminal guanidine antibiotics showed high activity against a standard panel of Gram-positive bacteria. Four selected derivatives displayed excellent antibacterial activity against a series of nosocomial VanA Enterococcus faecium strains.
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2
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Sagar NR, Durgamma S, Srinivasulu C, Basavaprabhu H, Sureshbabu V. A Unified Approach to Access
N
‐Acyl Sulfonamide Tethered Peptide Conjugates. ChemistrySelect 2019. [DOI: 10.1002/slct.201901024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nagamangala Ramachandra Sagar
- Room No. 109Peptide Research LaboratoryDepartment of ChemistryCentral College CampusDr. B. R. Ambedkar VeedhiBangalore University Bangalore 560 001 India
| | - Suram Durgamma
- Room No. 109Peptide Research LaboratoryDepartment of ChemistryCentral College CampusDr. B. R. Ambedkar VeedhiBangalore University Bangalore 560 001 India
| | - Chinthaginjala Srinivasulu
- Room No. 109Peptide Research LaboratoryDepartment of ChemistryCentral College CampusDr. B. R. Ambedkar VeedhiBangalore University Bangalore 560 001 India
| | - Hosamani Basavaprabhu
- Room No. 109Peptide Research LaboratoryDepartment of ChemistryCentral College CampusDr. B. R. Ambedkar VeedhiBangalore University Bangalore 560 001 India
| | - Vommina Venkata Sureshbabu
- Room No. 109Peptide Research LaboratoryDepartment of ChemistryCentral College CampusDr. B. R. Ambedkar VeedhiBangalore University Bangalore 560 001 India
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Pulka-Ziach K, Antunes S, Perdriau C, Kauffmann B, Pasco M, Douat C, Guichard G. Postelongation Strategy for the Introduction of Guanidinium Units in the Main Chain of Helical Oligourea Foldamers. J Org Chem 2018; 83:2530-2541. [PMID: 29381363 DOI: 10.1021/acs.joc.7b01895] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of hybrid urea-based foldamers containing isosteric guanidinium linkages at selected positions in the sequence is described. We used a postelongation approach whereby the guanidinium moiety is introduced by direct transformation of a parent oligo(urea/thiourea) foldamer precursor. The method involves activation of the thiourea by treatment with methyl iodide and subsequent reaction with amines. To avoid undesired cyclization with the preceding urea moiety, resulting in heterocyclic guanidinium formation in the main chain, the urea unit preceding the thiourea unit in the sequence was replaced by an isoatomic and isostructural γ-amino acid. The approach was extended to solid-phase techniques to accelerate the synthesis of longer and more functionalized sequences. Under optimized conditions, an octamer hybrid oligomer incorporating a central guanidinium linkage was obtained in good overall yield and purity. This work also reports data related to the structural consequences of urea by guanidinium replacements in solution and reveals that helical folding is substantially reduced in oligomers containing a guanidinium group.
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Affiliation(s)
- Karolina Pulka-Ziach
- Institut de Chimie et Biologie des Membranes et des Nano-objets 6 (CBMN), UMR 5248, Institut Européen de Chimie et Biologie, Université de Bordeaux, Centre National de la Recherche Scientifique (CNRS) , 2 rue Robert Escarpit, F-33607 Pessac, France.,Faculty of Chemistry, Universtiy of Warsaw , Pasteura 1, 02-093 Warsaw, Poland
| | - Stéphanie Antunes
- Institut de Chimie et Biologie des Membranes et des Nano-objets 6 (CBMN), UMR 5248, Institut Européen de Chimie et Biologie, Université de Bordeaux, Centre National de la Recherche Scientifique (CNRS) , 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Camille Perdriau
- Institut de Chimie et Biologie des Membranes et des Nano-objets 6 (CBMN), UMR 5248, Institut Européen de Chimie et Biologie, Université de Bordeaux, Centre National de la Recherche Scientifique (CNRS) , 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Brice Kauffmann
- Institut Européen de Chimie et Biologie, UMS3033/US001, Université de Bordeaux, Institut National de la Santé et de la Recherche Médicale (INSERM), CNRS , F-33607 Pessac, France
| | - Morgane Pasco
- Institut de Chimie et Biologie des Membranes et des Nano-objets 6 (CBMN), UMR 5248, Institut Européen de Chimie et Biologie, Université de Bordeaux, Centre National de la Recherche Scientifique (CNRS) , 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Céline Douat
- Institut de Chimie et Biologie des Membranes et des Nano-objets 6 (CBMN), UMR 5248, Institut Européen de Chimie et Biologie, Université de Bordeaux, Centre National de la Recherche Scientifique (CNRS) , 2 rue Robert Escarpit, F-33607 Pessac, France
| | - Gilles Guichard
- Institut de Chimie et Biologie des Membranes et des Nano-objets 6 (CBMN), UMR 5248, Institut Européen de Chimie et Biologie, Université de Bordeaux, Centre National de la Recherche Scientifique (CNRS) , 2 rue Robert Escarpit, F-33607 Pessac, France
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Santhosh L, Durgamma S, Shekharappa, Sureshbabu VV. Staudinger/aza-Wittig reaction to access N β-protected amino alkyl isothiocyanates. Org Biomol Chem 2018; 16:4874-4880. [PMID: 29931019 DOI: 10.1039/c8ob01061g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A unified approach to access Nβ-protected amino alkyl isothiocyanates using Nβ-protected amino alkyl azides through a general strategy of Staudinger/aza-Wittig reaction is described. The type of protocol used to access isothiocyanates depends on the availability of precursors and also, especially in the amino acid chemistry, on the behavior of other labile groups towards the reagents used in the protocols; fortunately, we were not concerned about both these factors as precursor-azides were prepared easily by standard protocols, and the present protocol can pave the way for accessing title compounds without affecting Boc, Cbz and Fmoc protecting groups, and benzyl and tertiary butyl groups in the side chains. The present strategy eliminates the need for the use of amines to obtain title compounds and thus, this method is step-economical; additional advantages include retention of chirality, convenient handling and easy purification. A few hitherto unreported compounds were also prepared, and all final compounds were completely characterized by IR, mass, optical rotation, and 1H and 13C NMR studies.
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Affiliation(s)
- L Santhosh
- # 109, Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus, Dr. B. R. Ambedkar Veedhi, Bangalore University, Bangalore, 560001, India.
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Berlinck RGS, Romminger S. The chemistry and biology of guanidine natural products. Nat Prod Rep 2016; 33:456-90. [DOI: 10.1039/c5np00108k] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The present review discusses the isolation, structure determination, synthesis, biosynthesis and biological activities of secondary metabolites bearing a guanidine group.
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Affiliation(s)
| | - Stelamar Romminger
- Instituto de Química de São Carlos
- Universidade de São Paulo
- São Carlos
- Brazil
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