Construction of pyrimido[5,4-<i>e</i>]-<i>as</i>-triazine, purine,<i>v</i>-triazolo-[4,5-<i>d</i>]pyrimidine and pyrazolo[3,4-<i>d</i>]pyrimidine ring systems from 5-arylazo-6-arylidenehydrazino-1,3-dimethyluracils
作者:Sadao Nishigaki、Misuzu Ichiba、Kiyoko Fukami、Keitaro Senga
DOI:10.1002/jhet.5570190413
日期:1982.7
Reaction of 5-arylazo-6-arylidenehydrazino-1,3-dimethyluracils (II), prepared by the treatment of 6-aryl-idenehydrazino-1,3-dimethyluracils (I) with diazotized arylamines, with dimethylformamide dimethylacetal resulted in the formation of pyrimido[5,4-e]-as-triazine (V) system, while the thermolysis of II resulted in the formation of purine (X), v-triazolo[4,5-d]pyrimidine (XII), and pyrazolo[3,4-d]pyrimidine
通过用重氮化的芳胺处理6-芳基-亚氨基肼基-1,3-二甲基尿嘧啶(I)制备的5-芳基偶氮-6-亚芳基肼基-1,3-二甲基尿嘧啶(II)与二甲基甲酰胺二甲基缩醛反应形成以嘧啶[5,4- e ]-为-三嗪(V)体系,而II的热解导致嘌呤(X),v-三唑并[4,5- d ]嘧啶(XII)和吡唑并[ 3,4- d ]嘧啶(XIV,XIX)系统代替了预期的V。已提出了在这些反应中形成各种环系统的合理机理。