5770-28-5Relevant academic research and scientific papers
Concise Xanthine Synthesis through a Double-Amidination Reaction of a 6-Chlorouracil with Amidines using Base-Metal Catalysis
Morel, Bénédicte,Franck, Philippe,Bidange, Johan,Sergeyev, Sergey,Smith, Dan A.,Moseley, Jonathan D.,Maes, Bert U. W.
, p. 624 - 628 (2017/02/15)
A new and concise route towards xanthines through a double-amidination reaction is described; consecutive intermolecular C?Cl and intramolecular oxidative C?H amidination. N-uracil amidines are obtained through SNAE on a 6-chlorouracil with amidines. Direct Cu-catalyzed oxidative C?H amidination on these N-uracil amidines yields polysubstituted xanthines. Sustainable oxidants, tBu2O2or O2, can be used in this oxidase-type reaction. The protocol allows for the introduction of N1, N3, N7, and C8 substituents during the xanthine-scaffold construction, thus avoiding post-functionalization steps. Both 6-chlorouracils and amidines are readily available commercially or through synthesis.
A high chemical reactivity of 5-azidouracils and its synthetic application: Novel synthesis of 8-substituted 1,3-dimethylxanthine derivatives
Hirota, Kosaku,Sako, Magoichi,Sajiki, Hironao
, p. 547 - 554 (2007/10/03)
A novel method for the preparation of 8-substituted 1,3-dimethylxanthine derivatives (7 or 8) is described: treatment of 6-alkylamino-5-bromo-1,3-dimethyluracils (6a-e), easily prepared by brornination of the corresponding 6-alkyIamino-1,3-dimethyluracils (5), with sodium azide in DMF at ambient temperature allowed the direct formation of the 8-substituted 1,3-dimethylxanthines (7) proceeding via a transient formation of the corresponding 5-azido-1,3-dimethyluracils. The 5-bromo-1,3-dimethyluracils (6f, g) possessing an α-branched alkylamino group at the 6-position similarly react with sodium azide to afford 8,8-disubstituted 1,3-dimethyl-8H-xanthines (8,8-disubstituted 1,3-dimethyl-3,8-dihydropurine-2,6-diones)(8).
A NOVEL RING CONTRACTION OF LUMAZINES TO THEOPHYLLINES
Sugimoto, Takashi,Nishioka, Noriko,Murata, Shizuaki,Matsuura, Sadao
, p. 1565 - 1566 (2007/10/02)
An unusual ring contraction of 7-methoxy-1,3-dimethyllumazines proceeded by an activated aluminum in methanolic ammonia to give 8-alkyltheophyllines.
