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Martelli G, Cirillo M, Giraldi V, Giacomini D. Chemoenzymatic enantioselective route to get (+) and (-) 4-acetoxy-azetidin-2-one by Lipase-catalysed kinetic resolution and their applications. Bioorg Chem 2021; 120:105580. [DOI: 10.1016/j.bioorg.2021.105580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 11/04/2021] [Accepted: 12/19/2021] [Indexed: 11/02/2022]
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Wang F, Tan X, Wu T, Zheng LS, Chen GQ, Zhang X. Ni-Catalyzed asymmetric reduction of α-keto-β-lactams via DKR enabled by proton shuttling. Chem Commun (Camb) 2020; 56:15557-15560. [PMID: 33244528 DOI: 10.1039/d0cc05599a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Chiral α-hydroxy-β-lactams are key fragments of many bioactive compounds and antibiotics, and the development of efficient synthetic methods for these compounds is of great value. The highly enantioselective dynamic kinetic resolution (DKR) of α-keto-β-lactams was realized via a novel proton shuttling strategy. A wide range of α-keto-β-lactams were reduced efficiently and enantioselectively by Ni-catalyzed asymmetric hydrogenation, providing the corresponding α-hydroxy-β-lactam derivatives with high yields and enantioselectivities (up to 92% yield, up to 94% ee). Deuterium-labelling experiments indicate that phenylphosphinic acid plays a pivotal role in the DKR of α-keto-β-lactams by promoting the enolization process. The synthetic potential of this protocol was demonstrated by its application in the synthesis of a key intermediate of Taxol and (+)-epi-Cytoxazone.
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Affiliation(s)
- Fangyuan Wang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
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Kaur R, Singh R, Kumar A, Kaur S, Priyadarshi N, Singhal NK, Singh K. 1,2,3-Triazole β-lactam conjugates as antimicrobial agents. Heliyon 2020; 6:e04241. [PMID: 32637684 PMCID: PMC7327255 DOI: 10.1016/j.heliyon.2020.e04241] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/29/2020] [Accepted: 06/15/2020] [Indexed: 01/12/2023] Open
Abstract
A convenient and efficient synthesis of new triazole β-lactam conjugates using click chemistry is described. β-lactam 15 and 16 were prepared using cycloaddition strategy and propargylated at N-1 to afford compounds 17 and 18. Cu-catalyzed click reaction of these β-lactams 17 and 18 with different aryl azides provided 1,2,3-triazole conjugates 6 and 7, respectively. The products were fully characterized spectroscopically and tested against Gram-(+) and Gram-(-) bacteria. Compound 7a and 7c were found to be most active.
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Affiliation(s)
- Rajneesh Kaur
- Department of Chemistry, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Haryana, 133207, India
| | - Raman Singh
- Department of Chemistry, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Haryana, 133207, India
| | - Antresh Kumar
- Department of Biotechnology, Central University of South Bihar, Panchanpur, Gaya, 824236, India
- Department of Biochemistry, Central University of Haryana, Mahendergarh, Haryana, 123031, India
| | - Satvinder Kaur
- Department of Chemistry, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Haryana, 133207, India
| | - Nitesh Priyadarshi
- National Agri-Food Biotechnology Institute (NABI), Sector-81, S.A.S. Nagar, Mohali, Punjab, 140306, India
| | - Nitin Kumar Singhal
- National Agri-Food Biotechnology Institute (NABI), Sector-81, S.A.S. Nagar, Mohali, Punjab, 140306, India
| | - Kuldeep Singh
- Department of Chemistry, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Haryana, 133207, India
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