nucleophilic substitution reaction with amines. The subsequent treatment of the obtained products with aq H2SO4 can lead to either N-denitrosation to obtain 4,6-pyrimidinediamines or to a Fischer-Hepp type rearrangement to obtain 5-nitroso-4,6-pyrimidinediamines. It was found that the outcome of the reaction strongly depends on the structure of the pyrimidines. Activation of the pyrimidine ring by three
N-亚硝基部分可用于将
氯嘧啶活化为与胺发生亲核取代反应。所得产物用 aq H2SO4 进行后续处理可导致 N-脱亚硝基得到 4,6-
嘧啶二胺,或导致 Fischer-Hepp 型重排以得到 5-亚硝基-4,6-
嘧啶二胺。发现反应的结果在很大程度上取决于
嘧啶的结构。三个具有正中间体效应的基团激活
嘧啶环对于分子内亚硝基迁移至关重要。