Differentiation between [1,2,4]triazolo[1,5-a] pyrimidine and [1,2,4]triazolo[4,3-a]- pyrimidine regioisomers by 1H15N HMBC experiments
作者:Antonio Salgado、Carmen Varela、Ana María García Collazo、Paolo Pevarello
DOI:10.1002/mrc.2634
日期:——
with either a 3-amino-[1,2,4]-triazole or a 3,5-diamino-[1,2,4]-triazole precursor was studied. In agreement with previous reports, two different bicycles, namely, bearing the regioisomeric [1,2,4]triazolo[1,5-a]pyrimidine (1) or [1,2,4]triazolo[4,3-a]pyrimidine (2) structural surrogates, could be obtained. We found that, depending on the triazole precursor, only one regioisomer resulted, either of the
研究了丙二醛衍生物与3-氨基-[1,2,4]-三唑或3,5-二氨基-[1,2,4]-三唑前体的缩合。与以前的报告一致,有两种不同的自行车,即带有区域异构体的[1,2,4]三唑[1,5-a]嘧啶(1)或[1,2,4]三唑[4,3-a]可获得嘧啶(2)结构替代物。我们发现,取决于三唑前体,仅产生一种区域异构体,为1系列或2系列。我们还观察到,可以通过(1)H-(15)N HMBC实验间接测量它们的(15)N化学位移来明确区分这两个结构替代物。[1,2,4]三唑并[4,3-a]嘧啶向[1,2,4]三唑并[1,5-a]嘧啶对应物的偶发转化可以通过(15)N NMR数据明确确定。