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。
DOI:
10.1039/p19900000809
作为产物:
描述:
1H-吡唑-1-胺 、 alkaline earth salt of/the/ methylsulfuric acid 以71%的产率得到N-(pyrazol-1-yl)formamide
参考文献:
名称:
Rearrangement of N-(alkylamino)azoles in acid media: a new entry to C-amino-N-substituted azoles
摘要:
A ring-opening/ring-closure mechanism for the thermal rearrangement of 1-(alkylamino)pyrazoles into 5-amino-1-alkylpyrazoles in acid medium has been established. 1-(Benzylamino)pyrazoles show a different reactivity, affording bis(5-amino-1-benzyl-4-pyrazolyl)phenylmethanes. The reaction was extended to 1-(alkylamino)indazoles but failed in the case of 1-(alkylamino)-1,2,4-triazoles.
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。
SANZ, DIONISIA;CLARAMUNT, ROSA M.;ELGUERO, JOSE;SALAZAR, LORETO;ESPADA, M+, J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N, C. 809-810
作者:SANZ, DIONISIA、CLARAMUNT, ROSA M.、ELGUERO, JOSE、SALAZAR, LORETO、ESPADA, M+
DOI:——
日期:——
Rearrangement of N-(alkylamino)azoles in acid media: a new entry to C-amino-N-substituted azoles
作者:Loreto Salazar、Modesta Espada、Carmen Avendano、Rosa Maria Claramunt、Dionisia Sanz、Jose Elguero
DOI:10.1021/jo00031a042
日期:1992.2
A ring-opening/ring-closure mechanism for the thermal rearrangement of 1-(alkylamino)pyrazoles into 5-amino-1-alkylpyrazoles in acid medium has been established. 1-(Benzylamino)pyrazoles show a different reactivity, affording bis(5-amino-1-benzyl-4-pyrazolyl)phenylmethanes. The reaction was extended to 1-(alkylamino)indazoles but failed in the case of 1-(alkylamino)-1,2,4-triazoles.