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Kim N, Sengupta S, Lee J, Dash U, Kim S, Kim HJ, Song C, Sim T. Synthesis and antibacterial activities of baulamycin A inspired derivatives. Eur J Med Chem 2023; 259:115592. [PMID: 37478559 DOI: 10.1016/j.ejmech.2023.115592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 06/20/2023] [Accepted: 06/23/2023] [Indexed: 07/23/2023]
Abstract
SbnE is an essential enzyme for staphyloferrin B biosynthesis in Staphylococcus aureus. An earlier study showed that natural product baulamycin A has in vitro inhibitory activity against SbnE and antibacterial potency. A SAR study with analogues of baulamycin A was conducted to identify potent inhibitors of SbnE and/or effective antibiotics against MRSA. The results show that selected analogues, including 11, 18, 21, 24a, 24c, 24m and 24n, exhibit single-digit micromolar inhibitory potencies against SbnE (IC50s = 1.81-8.94 μM) and 11, 24m, 24n possess significant activities against both SbnE (IC50s = 4.12-6.12 μM) and bacteria (MICs = 4-32 μg/mL). Biological investigations revealed that these substances possess potent cell wall disruptive activities and that they inhibit siderophore production in MRSA. Among the selected analogues, 7 has excellent antibiotic activities both gram-positive and -negative bacteria (0.5-4 μg/mL). Moreover, these analogues significantly impede biofilm formation in a concentration-dependent manner. Taken together, the results of the investigation provide valuable insight into the nature of novel baulamycin A analogues that have potential efficacy against MRSA owing to their membrane damaging activity and/or inhibitory efficacy against siderophore production.
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Affiliation(s)
- Namkyoung Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea; Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea; Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Sandip Sengupta
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea; Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Jiwon Lee
- Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Uttam Dash
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Soojeung Kim
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Hak Joong Kim
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Chiman Song
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Taebo Sim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea; Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea; Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
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Skrotzki EA, Vandavasi JK, Newman SG. Ozone-Mediated Amine Oxidation and Beyond: A Solvent-Free, Flow-Chemistry Approach. J Org Chem 2021; 86:14169-14176. [PMID: 34100607 DOI: 10.1021/acs.joc.1c00768] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ozone is a powerful oxidant, most commonly used for oxidation of alkenes to carbonyls. The synthetic utility of other ozone-mediated reactions is hindered by its high reactivity and propensity to overoxidize organic molecules, including most solvents. This challenge can largely be mitigated by adsorbing both substrate and ozone onto silica gel, providing a solvent-free oxidation method. In this manuscript, a flow-based packed bed reactor approach is described that provides exceptional control of reaction temperature and time to achieve improved control and chemoselectivity over this challenging transformation. A powerful method to oxidize primary amines into nitroalkanes is achieved. Examples of pyridine, C-H bond, and arene oxidations are also demonstrated, confirming the system is generalizable to diverse ozone-mediated processes.
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Affiliation(s)
- Eric A Skrotzki
- Centre for Catalysis Research and Innovation, Department of Chemistry & Biomolecular Sciences, 10 Marie Curie, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5
| | - Jaya Kishore Vandavasi
- Centre for Catalysis Research and Innovation, Department of Chemistry & Biomolecular Sciences, 10 Marie Curie, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5
| | - Stephen G Newman
- Centre for Catalysis Research and Innovation, Department of Chemistry & Biomolecular Sciences, 10 Marie Curie, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5
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Hassan Z, Stahlberger M, Rosenbaum N, Bräse S. Criegee‐Intermediate über die Ozonolyse hinaus: Ein Einblick in Synthesen und Mechanismen. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zahid Hassan
- Institut für Organische Chemie (IOC) Karlsruher Institut für Technologie (KIT) Fritz-Haber-Weg 6 76131 Karlsruhe Deutschland
- 3DMM2O – Exzellenzcluster (EXC-2082/1-390761711) Karlsruher Institut für Technologie (KIT) Karlsruhe Deutschland
| | - Mareen Stahlberger
- Institut für Organische Chemie (IOC) Karlsruher Institut für Technologie (KIT) Fritz-Haber-Weg 6 76131 Karlsruhe Deutschland
| | - Nicolai Rosenbaum
- Institut für Organische Chemie (IOC) Karlsruher Institut für Technologie (KIT) Fritz-Haber-Weg 6 76131 Karlsruhe Deutschland
| | - Stefan Bräse
- Institut für Organische Chemie (IOC) Karlsruher Institut für Technologie (KIT) Fritz-Haber-Weg 6 76131 Karlsruhe Deutschland
- 3DMM2O – Exzellenzcluster (EXC-2082/1-390761711) Karlsruher Institut für Technologie (KIT) Karlsruhe Deutschland
- Institut für Biologische und Chemische Systeme –, Funktionelle molekulare Systeme (IBCS-FMS) Karlsruher Institut für Technologie (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
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Hassan Z, Stahlberger M, Rosenbaum N, Bräse S. Criegee Intermediates Beyond Ozonolysis: Synthetic and Mechanistic Insights. Angew Chem Int Ed Engl 2021; 60:15138-15152. [PMID: 33283439 PMCID: PMC8359312 DOI: 10.1002/anie.202014974] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Indexed: 12/20/2022]
Abstract
After more than 70 years since their discovery, Criegee intermediates (CIs) are back at the forefront of modern chemistry of short-lived reactive intermediates. They play an important role in the mechanistic context of chemical synthesis, total synthesis, pharmaceuticals, and, most importantly, climate-controlling aerosol formation as well as atmospheric chemistry. This Minireview summarizes key aspects of CIs (from the mechanism of formation, for example, by ozonolysis of alkenes and photolysis methods employing diiodo and diazo compounds, to their electronic structures and chemical reactivity), highlights the most recent findings and some landmark results of gas-phase kinetics, and detection/measurements. The recent progress in synthetic and mechanistic studies in the chemistry of CIs provides a guide to illustrate the possibilities for further investigations in this exciting field.
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Affiliation(s)
- Zahid Hassan
- Institute of Organic ChemistryKarlsruhe Institute of TechnologyFritz-Haber-Weg 676131KarlsruheGermany
- 3DMM2O—Cluster of Excellence (EXC-2082/1–390761711)Karlsruhe Institute of Technology (KIT)76131KarlsruheGermany
| | - Mareen Stahlberger
- Institute of Organic ChemistryKarlsruhe Institute of TechnologyFritz-Haber-Weg 676131KarlsruheGermany
| | - Nicolai Rosenbaum
- Institute of Organic ChemistryKarlsruhe Institute of TechnologyFritz-Haber-Weg 676131KarlsruheGermany
| | - Stefan Bräse
- Institute of Organic ChemistryKarlsruhe Institute of TechnologyFritz-Haber-Weg 676131KarlsruheGermany
- 3DMM2O—Cluster of Excellence (EXC-2082/1–390761711)Karlsruhe Institute of Technology (KIT)76131KarlsruheGermany
- Institute of Biological and Chemical Systems (IBCS-FMS)Karlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany
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