Rearrangement of 1-amino- and 1-alkylamino-pyrazoles to 5-aminopyrazoles
作者:Dionisia Sanz、Rosa Ma Claramunt、Jos� Elguero、Loreto Salazar、Modesta Espada
DOI:10.1039/p19900000809
日期:——
Rearrangement of 1-aminopyrazole and 1-alkylaminopyrazoles into the corresponding 5-aminopyrazoles has been achieved in 48% aqueous hydrobromic acid. The reaction, occurring through a ring opening–ring closure mechanism, constitutes a new and unambiguous procedure for the preparation of 1-substituted 5-aminopyrazoles. The products have been identified on the basis of 1H and 13C n.m.r. spectroscopic
在48%的氢溴酸水溶液中已经实现了将1-氨基吡唑和1-烷基氨基吡唑重排成相应的5-氨基吡唑。通过开环-开环机理发生的反应,构成了制备1-取代的5-氨基吡唑的新方法。产品已根据1 H和13 C nmr光谱结果以及与真实样品的比较进行了鉴定。