Study on Oxazolopyrimidines. VI. Formation of 3-Substituted Xanthines<i>via</i>7(6<i>H</i>)-Iminooxazolopyrimidines
作者:Yozo Ohtsuka
DOI:10.1246/bcsj.46.506
日期:1973.2
The condensation of several primary amines with 4-cyano-5-dialkoxymethylenaminooxazole gave 6-substituted 5-alkoxy-7(6H)-immooxazolo[5,4-d]pyrimidines. These compounds were converted into 3-substituted xanthines by treatment with aqueous alkali or by heating in formamide. The present reaction was compared with an analogous reaction, formation of 9-substituted hypoxantines via 7-aminooxazolo[5,4-d]pyridimine
几种伯胺与 4-氰基-5-二烷氧基亚甲基氨基恶唑的缩合得到 6-取代的 5-烷氧基-7(6H)-immooxazolo[5,4-d] 嘧啶。通过用碱水溶液处理或在甲酰胺中加热,这些化合物被转化为3-取代的黄嘌呤。将本反应与类似反应,通过7-氨基恶唑并[5,4-d]吡啶衍生物形成9-取代的次黄嘌呤进行比较,并从取代基对稳定性的影响方面讨论了反应过程的差异。恶唑并嘧啶中间体。