212248-00-5Relevant articles and documents
Applications of alkaloid essramycin and derivative thereof in resisting of plant viruses
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Paragraph 0021; 0027-0033, (2020/01/30)
The invention relates to applications of alkaloid essramycin and a derivative thereof in resisting of plant viruses, wherein the chemical structural formula of the alkaloid essramycin is represented in the specification, specifically the alkaloid essramyc
6-Nitro- and 6-Bromo Derivatives of 4,7-Dihydro-1,2,4-triazolo[1,5-a]pyrimidin-7-one
Kofman,Uvarova,Kartseva,Uspenskaya
, p. 1784 - 1793 (2007/10/03)
Cyclocondensation of 3-substituted 5-amino-1,2,4-triazoles with ethyl acetoacetate gave a series of 2-substituted 5-methyl-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidin-7-ones, including those containing functional groups in the 2-substituent. Nitration of these compounds with a mixture of sulfuric and nitric acids and bromination with bromine in alkaline medium resulted in the corresponding 6-nitro- and 6-bromo derivatives; in some cases the nitration occurred both at the pyrimidine ring and at the side chain in the triazole moiety. The bromination involved only the heteroring. Functional groups in the 2-substituent underwent transformations typical of these groups. 6-Nitro- and 6-bromo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidin-7-ones readily form salts with nitrogen-containing organic bases.