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Combinatorial Chemistry & High Throughput Screening

Editor-in-Chief

ISSN (Print): 1386-2073
ISSN (Online): 1875-5402

Research Article

Combinatorial Synthesis of Novel 1-sulfonyloxy/acyloxyeugenol Derivatives as Fungicidal Agents

Author(s): Genqiang Chen, Lina Zhu, Jiaxuan He, Song Zhang, Yuanhao Li, Xiaolong Guo, Di Sun, Yuee Tian, Shengming Liu, Xiaobo Huang and Zhiping Che*

Volume 25, Issue 9, 2022

Published on: 13 August, 2021

Page: [1545 - 1551] Pages: 7

DOI: 10.2174/1386207324666210813114829

Price: $65

Abstract

Background: Developing the high-efficiency and low-risk small-molecule greenfungicide is the key to effective control of the plant pathogenic oomycetes. Essential oils play a very important role in novel fungicide discovery for their unique sources and potential target sites. Eugenol, a kind of plant essential oil, was mainly isolated from the unopened and dried flower buds of Syzygium aromaticum of the Myrtaceae family. Due to its unique structural skeleton, eugenol and its derivatives have exhibited a wide range of biological activities. However, a study on the synthesis of novel 1-sulfonyloxy/acyloxyeugenol derivatives as fungicidal agents against Phytophthora capsici has not yet been reported.

Methods: Twenty-six novel 1-sulfonyloxy/acyloxyeugenol derivatives (3a-p and 5a-j) were prepared and their structures were well characterized by 1H NMR, HRMS, and m.p. Their fungicidal activity was evaluated against P. capsici by using the mycelial growth rate method.

Results: To find novel natural-product-based fungicidal agents to control the plant pathogenic oomycetes, we herein designed and synthesized two series of novel 1-sulfonyloxy/acyloxyeugenol derivatives (3a-p and 5a-j) as fungicidal agents against P. capsici Leonian, in vitro. Results of fungicidal activity revealed that, among all compounds, especially compounds 3a, 3f, and 3n displayed the most potent anti-oomycete activity against P. capsici with EC50 values of 79.05, 75.05, and 70.80, respectively.

Conclusion: The results revealed that the anti-oomycete activity of eugenol with the sulfonyloxy group was higher than that with the acyloxy group. It is suggested that the fungicidal activity of eugenol can be improved by introducing the sulfonyloxy group. This will pave the way for further design, structural modification, and development of eugenol derivatives as fungicidal agents.

Keywords: Natural bioresource, eugenol, 1-sulfonyloxy/acyloxy, Phytophthora capsici, fungicidal activity, botanical fungicides.

Graphical Abstract
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