Chinese Journal of Organic Chemistry >
Synthesis and Fungicidal Evaluation of Novel β-Carboline-Benzimidazole and β-Carboline-Benzothiazole Hybrids
Received date: 2018-05-29
Revised date: 2018-07-07
Online published: 2018-08-22
Supported by
Project supported by the Scientific Research Innovation Project in Xinjiang Uygur Autonomous Region (No. XJGRI2017045), the National Students Innovation and Entrepreneuship Training Program (No. 201810759055), the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT15R46), and the Yangtze River Scholar Research Project of Shihezi University (No. CJXZ201601).
In order to discover novel compounds with biological activities, new molecular hybrids combining benzimidazole or its bioisostere benzothiazole with β-carboline were synthesized. The benzimidazole or benzothiazole scaffold was linked at position-1 with β-carboline which was further characterized by 1H NMR, 13C NMR and HRMS. All of the target compounds were evaluated in vitro for their antifungal activity against Rhizoctorzia solani, Fusarium oxysporum, Botrytis cinerea Pers., sunflower sclerotinia rot and rape sclerotinia rot by mycelia growth inhibition assay at 50 μg·mL-1. The preliminary results showed that most compounds exhibit mild inhibiting effect against all the tested strains. Among them, 1-(1H-benzo[d]-imida-zol-2-yl)-9-ethyl-β-carboline (4a), 1-(1H-benzo[d]imidazol-2-yl)-9-benzyl-β-carboline (4c) and 1-(1H-benzo[d]imidazol-2-yl)-9-(3-chlorobenzyl)-β-carboline (4e) showed satisfactory antifungal activity against sunflower sclerotinia rot, 1-(1H-benzo[d]-imidazol-2-yl)-9-ethyl-β-carboline (4a), 1-(1H-benzo[d]imidazol-2-yl)-9-n-butyl-β-carboline (4b), 1-(1H-benzo[d]imidazol-2-yl)-9-benzyl-β-carboline (4c), 1-(1H-benzo[d]imidazol-2-yl)-9-((perfluorophenyl)methyl)-β-carboline (4f), 1-(benzo[d]-thiazol-2-yl)-9-(3-chlorobenzyl)-β-carboline (5e) and 1-(benzo[d]thiazol-2-yl)-9-((perfluorophenyl)methyl)-β-carboline (5f) displayed excellent fungicidal activity against rape sclerotinia rot. Specifically, compound 4c exhibited broad-spectrum fungicidal activity against most of the tested fungi.
Key words： β-carboline; benzimidazole; benzothiazole; antifungal activity
Huo Xinyu , Li Wenbin , Zhang Boya , Chen Xiaofei , Zhou Yueting , Zhang Jie , Han Xiaoqiang , Dai Bin . Synthesis and Fungicidal Evaluation of Novel β-Carboline-Benzimidazole and β-Carboline-Benzothiazole Hybrids[J]. Chinese Journal of Organic Chemistry, 2018 , 38(12) : 3356 -3362 . DOI: 10.6023/cjoc201805053
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