110950-95-3Relevant academic research and scientific papers
A New Synthesis of Pyrazolopyrimidines from Acetylenic β-Diketones
Marei, Mohamed Gaber,Aly, Dalia Mahmoud,Mishrikey, Morcos Michael
, p. 3419 - 3422 (2007/10/02)
2-Aryl-2-phenylpyrazolopyrimidine-7(6H)-thiones have been synthesized by the reaction of 1,5-diaryl-4-pentyne-1,3-diones with thiosemicarbazide and their reactions were studied.The pyrazolopyrimidinethiones give with certain electrophiles the respective 3-substituted 7-thiones.Their oxidation affords the corresponding disulfide.Moreover, they can be converted to the corresponding pyrazolopyrimidinones on reaction with alkaline hydrogen peroxide.The structure of the above compounds was confirmed from their spectral characteristics.
REACTIONS OF HETEROCYCLIC CATIONS WITH N-CONTAINING NUCLEOPHILES. 15. REACTION OF 2,6-DIPHENYLPYRYLIUM PERCHLORATE WITH SEMI- AND THIOSEMICARBAZIDES
Zvezdina, E. A.,Zhdanova, M. P.,Anisimova, O. S.,Nechayuk, I. I.
, p. 1322 - 1326 (2007/10/02)
The reaction of 2,6-diphenylpyrylium perchlorate with semi- and thiosemicarbazides in ethanol leads to 1-carbamoyl- and 1-thiocarbamoyl-3-phenyl-5-phenacyl-4,5-dihydropyrazoles, the cyclization of which yields 2,5-diphenyl-7-oxo(thio)-pyrazolopyrimidines.The tautomeric form of the latter is established by comparing their electronic absorption spectra with the spectra of the methyl derivatives.
