Hybrids of β-triketone and monoterpenoids from the peels of Callistemon viminalis
- PMID: 36804779
- DOI: 10.1016/j.fitote.2023.105459
Hybrids of β-triketone and monoterpenoids from the peels of Callistemon viminalis
Abstract
Phytoconstituents of the peels of Callistemon viminalis has been investigated for the first time. As a result, two pair of diastereomers of hybrids of β-triketone and α-phellandrene, named viminalisones A-B (1-2) and viminalisones CD (3-4), and three known analogues were obtained. Their structures and absolute configurations were elucidated through a combination of the analysis of their MS data, NMR spectra, single-crystal X-ray diffraction, and their experimental and calculated electronic circular dichroism (ECD) spectra. All isolates were evaluated for their antimicrobial activities against Botrytis cinerea and Cutibacterium acnes. Meroterpenoid 7 exhibited antibacterial activity against Botrytis cinerea with a MIC value of 0.256 mg/mL.
Keywords: Antibacterial activity; Callistemon viminalis; Meroterpenoids; Viminalisones A-D.
Copyright © 2023 Elsevier B.V. All rights reserved.
Conflict of interest statement
Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. No potential conflict of interest was reported by the authors.
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