A High Chemical Reactivity of 5-Azidouracils and Its Synthetic Application: Novel Synthesis of 8-Substituted 1,3-Dimethylxanthine Derivatives
摘要:
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 bromination of the corresponding 6-alkylamino-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 ct-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,g-dihydropurine-2,6-diones)(8).
Selective <i>N</i>
-Monoalkylation of 6-Aminouracils with Alcohols: An Environmentally Benign Protocol for the Synthesis of 6-Alkylaminouracils
作者:Anggi Eka Putra、Yohei Oe、Tetsuo Ohta
DOI:10.1002/ejoc.201701445
日期:2018.1.23
A highly selective N‐monoalkylation of 6‐aminouracils with alcohols was achieved through the borrowing hydrogen approach using iridium catalysis. This reaction provides an efficient and green approach to the synthesis of 6‐alkylaminouracils, which are useful intermediates in organic synthesis.
On the treatment of 1,3-dialkyl-6-alkylaminouracil (1) with dimethylacetylenedicarboxylate (DMAD), we were able to develop a new synthesis of deazapurine (pyrrolo[2,3-d]pyrimidine, 4), and proposed the plausible mechanism for the formation of 3 and 4 from the adduct [dimethyl 2-(1,3-dialkyl-6-alkylamino-2,4-dioxopyrimidin-5-yl)fumarate, 2] of 1 with DMAD.
在用乙炔二羧酸二甲酯(DMAD)处理1,3-二烷基-6-烷基氨基尿嘧啶(1)的过程中,我们能够开发出一种新的脱氮嘌呤合成方法(pyrrolo [2,3- d ] pyrimidine,4),并提出了可行的机制的形成的3和4从加合物[二甲基2-(1,3-二烷基-6-氨基-2,4- dioxopyrimidin -5-基)富马酸盐,2]的1与DMAD。
Cyanoacetylation of 6-aminouracils. Synthesis of 7-aminopyrido[2,3-d]pyrimidine-2,4,5-triones
作者:N. M. Smirnova、N. M. Cherdantseva、O. A. Burova、V. M. Nesterov、T. S. Safonova
DOI:10.1007/bf00509714
日期:1990.7
A Novel and Facile Synthesis of Pyrrolo[2,3-d]pyrimidines