6439-85-6Relevant academic research and scientific papers
5,5′-bipyridyl-2,4,6,2′,4′,6′-hexaone derivatives (hydurilic acids): Syntheses, mechanism of C-C-Bond formation and properties of the dimeric barbituric acid derivatives
Mueller, Christa E.,Roegler, Carolin,Hockemeyer, Joerg
experimental part, p. 703 - 720 (2009/12/26)
A series of hydurilic acid derivatives (5,5′-bipyrimidinyl-2,4,6,2′,4′,6′-hexaones) including several new derivatives was synthesized from 5,6-diaminouracils. Mechanisms for their formation are proposed and discussed. Furthermore, a new method for the preparation of pyrimidine-2,4,5,6-tetraone-5-oxime derivatives (violuric acids) was found starting from 5-amino-6-nitrosouracils.
A facile synthesis of pyrrolo-[3,2-d]pyrimidines from 6-azidouracils and ylide phosphoranes
Abdou, Wafaa M.,Fahmy, Amin F. M.,Kamel, Azza A.
, p. 357 - 365 (2007/10/03)
A series of the title compounds, 9-deazaxanthines, was regioselectively prepared in reasonable yields as major products from the reactions of 6-azidouracils 1a,b with stabilized ester-2a,b or keto-2c ylide phosphoranes and a moderated phosphorus ylide 3, instead of the expected triazoles. Side products were also observed wherein pyrimido[5,4-g]pteridine-2,4,5,7-tetrone (15) and other fused ring systems or acyclic-substituted uracil derivatives were isolated. A comparative study on the reactivity of 1a in analogy to 1b toward phosphoranes is also described.
A CONVERSION OF OXADIAZOLOPYRIMIDINE 1-OXIDES INTO PURINES
Yoneda, Fumio,Tachibana, Takako,Tanoue, Junko,Yano, Tetsumi,Sakuma, Yoshiharu
, p. 341 - 344 (2007/10/02)
Treatment of oxadiazolopyrimidine 1-oxides with amines led to the formation of the corresponding 8-substituted purine derivatives, along with other heterocyclic compounds in some cases.
