1-(Pyrimidin-4-yl)pyrazol-5(4H)-one derivatives: I. Synthesis of 3-methyl-1-(6-methyl-2-methylsulfanylpyrimidin-4-yl)-pyrazol-5-ol and specificity of its Knoevenagel reaction
摘要:
3-Methyl-1-(6-methyl-2-methylsulfanylpyrimidin-4-yl)-1H-pyrazol-5-ol available via cyclocondensation of 6-methyl-2-methylsulfanylpyrimidin-4-ylhydrazine with ethyl acetoacetate reacted with aromatic aldehydes to give two kinds of products, 4-arylmethylidene-5-oxo-4,5-dihydropyrazole and arylbis(5-hydroxypyrazol-4-yl)methane derivatives, depending on the substituent in the aromatic aldehyde.
1-(Pyrimidin-4-yl)pyrazol-5(4H)-one derivatives: I. Synthesis of 3-methyl-1-(6-methyl-2-methylsulfanylpyrimidin-4-yl)-pyrazol-5-ol and specificity of its Knoevenagel reaction
摘要:
3-Methyl-1-(6-methyl-2-methylsulfanylpyrimidin-4-yl)-1H-pyrazol-5-ol available via cyclocondensation of 6-methyl-2-methylsulfanylpyrimidin-4-ylhydrazine with ethyl acetoacetate reacted with aromatic aldehydes to give two kinds of products, 4-arylmethylidene-5-oxo-4,5-dihydropyrazole and arylbis(5-hydroxypyrazol-4-yl)methane derivatives, depending on the substituent in the aromatic aldehyde.
Alkoxy-1,2,4-triazolo (1,5-c) pyrimidine-2-sulfonamides, process for their preparation and intermediates
申请人:DowElanco
公开号:EP0343752A1
公开(公告)日:1989-11-29
Alkoxy substituted 1,2,4-triazolo[1,5-c]pyrimidine-2-sulfonamides are general and selective pre- and postemergence herbicides. These compounds are disclosed which are prepared from alkoxy substituted 1,2,4-triazolo[1,5-c]pyrimidine-2-sulfonyl halides by condensation with substituted N-trialkylsilylanilines and by other methods.
Claesen; Vanderhaeghe, Bulletin des Societes Chimiques Belges, 1959, vol. 68, p. 30,55
作者:Claesen、Vanderhaeghe
DOI:——
日期:——
5-Aryl-1-[pyrimidin-2(4)-yl]-3-phenyl-4,5-dihydro-1H-pyrazoles. Synthesis from substituted 2(4)-hydrazinopyrimidines and fragmentation under positive electrospray ionization
作者:A. V. Erkin、O. S. Yuzikhin、V. I. Krutikov
DOI:10.1134/s1070428016080133
日期:2016.8
Reaction of substituted 2(4)-hydrazinopyrimidines with 3-aryl-1-phenyl-2-propen-1-ones in the presence of a base results prevailingly in 5-aryl-1-[pyrimidin-2(4)-yl]-3-phenyl-4,5-dihydro-1H-pyrazoles. The fragmentation path of these compounds under positive electrospray ionization consists in simultaneous decomposition of their heterocyclic fragments.
BROWN D. J.; NAGAMATSU T., AUSTRAL. J. CHEM., 1979, 32, NO 7, 1585-1593
作者:BROWN D. J.、 NAGAMATSU T.
DOI:——
日期:——
Abdel-Fattah Abdel-Samei M., Sherif Sherif M., Youssef Mohamed M., Ahmed +, J. Chem. Res. Synop, (1994) N 11, S 412-413
作者:Abdel-Fattah Abdel-Samei M., Sherif Sherif M., Youssef Mohamed M., Ahmed +