作者:Kayed A. Abu Safieh、Ahmad M. Abu Mahthieh、Mustafa M. El-Abadelah、Mikdad T. Ayoub、Wolfgang Voelter
DOI:10.1007/s00706-006-0583-0
日期:2007.2
A novel method for the synthesis of a new series of 5-substituted 1,3-dimethyl pyrazolo[4,3- e ][1,2,4]triazines is described. The new synthetic strategy is based on the classical Bischler 1,2,4-benzotriazine synthesis. This approach involves the preparation of 5-hydrazinopyrazole from 5-chloro-1,3-dimethyl-4-nitropyrazole followed by acylation and nitro group reduction to form the corresponding 4
描述了一种合成一系列新的5-取代的1,3-二甲基吡唑并[4,3- e ] [1,2,4]三嗪的新方法。新的合成策略基于经典的 Bischler 1,2,4-苯并三嗪合成。该方法涉及由5-氯-1,3-二甲基-4-硝基吡唑制备5-肼基吡唑,然后进行酰化和硝基还原以形成相应的4-氨基-3-(酰基肼基)吡唑。后一种衍生物的分子内氧化环化,使用多磷酸,产生了各自的目标吡唑并三嗪。