New Application of Heterocyclic Diazonium Salts: Synthesis of New Pyrazolo[3,4‐<i>d</i>][1,2,3]triazin‐4‐ones
作者:Elizabeth L. Moyano、Juan Pablo Colomer、Gloria I. Yranzo
DOI:10.1002/ejoc.200701109
日期:2008.7
7-Substituted 3,7-dihydro-4H-pyrazolo[3,4-d][1,2,3]triazin-4-ones 2a–d were conveniently prepared by direct diazotization of 5-aminopyrazole-4-carbonitriles 1a–d in HCl media. Different reaction conditions and the effects of substituents on N-1 of the pyrazole ring were studied. A possible mechanistic exlpanation of the observed process is proposed. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim
7-取代的 3,7-二氢-4H-吡唑并[3,4-d][1,2,3]triazin-4-ones 2a-d 可方便地通过 5-氨基吡唑-4-腈 1a-的直接重氮化制备d 在 HCl 介质中。研究了不同反应条件和取代基对吡唑环N-1的影响。提出了对观察到的过程的可能的机械解释。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)