A Simple and Environmentally Benign Nitration of Pyrazoles by Impregnated Bismuth Nitrate
作者:P. Ravi、Girish M. Gore、Surya P. Tewari、Arun K. Sikder
DOI:10.1002/jhet.1093
日期:2013.11
environmentally friendly synthesis of nitropyrazoles in good yields using silica‐bismuth nitrate and silica‐sulfuric acid‐bismuth nitrate at room temperature for the first time. The relatively non‐toxic nature, ease of handling, easy availability, and low cost make the present procedure attractive for the nitration of a wide variety of diazoles in the drug and pharmaceutical industries.
Synthesis of 2-Alkylpyrazole-1-oxides: A Facile Access to 1-Alkyl-5-halopyrazoles
作者:Per Vedsø、Jørgen Eskildsen、Mikael Begtrup
DOI:10.1055/s-2001-14572
日期:——
Selective N-alkylation of 1-hydroxypyrazole 1 into the corresponding 2-alkyl-pyrazole-1-oxides 2a-f has been achieved by treatment with alkyl bromides in the absence of base. Subsequent deoxygenation/halogenation into 1-alkyl-5-halopyrazoles 3a-d and 4a-d using phosphorus oxyhalides is described.
Facile and environmentally friendly synthesis of nitropyrazoles using montmorillonite K-10 impregnated with bismuth nitrate
作者:P. Ravi、Surya P. Tewari
DOI:10.1016/j.catcom.2011.12.016
日期:2012.3
Nitropyrazoles in higher yields were synthesized using montmorillonite K-10 impregnated with bismuth nitrate and the present procedure may be applied for the nitration of a wide variety of azoles in the drug and pharmaceutical industries. (C) 2011 Elsevier B.V. All rights reserved.
Alcazar, Jesus; Almena, Ines; Begtrup, Mikael, Journal of the Chemical Society. Perkin transactions I, 1995, # 21, p. 2773 - 2782
作者:Alcazar, Jesus、Almena, Ines、Begtrup, Mikael、Hoz, Antonio de la