Chinese Journal of Organic Chemistry >
Synthesis and Biological Activity of Novel 1,3,4-Thiadiazolo[3,2-a]pyrimidinone Mesoionic Derivatives
Received date: 2019-03-13
Revised date: 2019-04-05
Online published: 2019-04-16
Supported by
Project supported by the National Key Research and Development Program of China (No. 2018YFD0200100).
A series of 1,3,4-thiadiazolo[3,2-a]pyrimidinone mesoionic derivatives were designed and synthesized with triflumezopyrim as the leading compound, and their structures were characterized by 1H NMR, 13C NMR, 19F NMR and HRMS. The preliminary biological activities indicated that the target compounds showed certain insecticidal activities at 100 μg/mL, of which the lethality rates of 2-((4-chlorobenzyl)thio)-8-((2-chlorothiazol-5-yl)methyl)-5-oxo-6-(3-(trifluoromethyl)phen-yl)-5H-[1,3,4]-thiadiazolo[3,2-a]pyrimidin-8-ium-7-olate (8b) and 2-(((2-chlorothiazol-5-yl)methyl)thio)-8-((2-chlorothiazol-5-yl)methyl)-5-oxo-6-(3-(trifluoromethyl)phenyl)-5H-[1,3,4]thiadiazolo-[3,2-a]pyrimidin-8-ium-7-olate (8d) against white-backed planthopper (WBPH) were 70%. Some compounds showed good antibacterial activities against Xanthomonas oryzae pv. oryzae (Xoo), Xanthomonas oryzae pv. oryzicola (Xoc) and Xanthomonas citri pv. citri (Xcc) at 50 μg/mL, and the inhi-bitory rates of 2-((2-(trifluoromethyl)benzyl)thio)-8-((2-chlorothiazol-5-yl)methyl)-5-oxo-6-(3-(trifluoromethyl)phenyl)-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-8-ium-7-olate (8h) to Xoo and Xoc were 70.91% and 53.34%, respectively, which were better than thiodiazole copper (47.76% and 23.25%) and bismerthiazol (66.97% and 17.24%). The inhibition rate of 2-((3-(tri-fluoromethyl)benzyl)thio)-8-((2-chlorothiazol-5-yl)methyl)-5-oxo-6-(3-(trifluoromethyl)phenyl)-5H-[1,3,4]thiadiazolo[3,2-a]-pyrimidin-8-ium-7-olate (8e) to Xcc was 68.97%, which was better than thiediazole copper (35.85%) and bismerthiazol (37.53%)
He Wenjing , Liu Denyue , Gan Xiuhai , Zhang Jian , Liu Zhengjun , Yi Chongfen , Song Bao'an . Synthesis and Biological Activity of Novel 1,3,4-Thiadiazolo[3,2-a]pyrimidinone Mesoionic Derivatives[J]. Chinese Journal of Organic Chemistry, 2019 , 39(8) : 2287 -2294 . DOI: 10.6023/cjoc201903023
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