N-Alkylhydrazones of aliphatic ketones in the synthesis of 1,3,4-trisubstituted non-symmetric pyrazoles
摘要:
Reactions of N-alkylhydrazones of aliphatic ketones with the Vilsmeier-Haack reagent (DMF-POCl3) were evaluated as a promising approach toward the synthesis of trisubstituted non-symmetric pyrazoles. It was found that either 1,3,4-trialkylpyrazoles or 1,3-dialkylpyrazole-4-carbaldehydes could be obtained in these transformations in high yields (72-83%), in a regioselective manner. (C) 2014 Elsevier Ltd. All rights reserved.
N-Alkylhydrazones of aliphatic ketones in the synthesis of 1,3,4-trisubstituted non-symmetric pyrazoles
作者:Sergey P. Ivonin、Bohdan B. Kurpil’、Eduard B. Rusanov、Oleksandr O. Grygorenko、Dmitry M. Volochnyuk
DOI:10.1016/j.tetlet.2014.02.058
日期:2014.4
Reactions of N-alkylhydrazones of aliphatic ketones with the Vilsmeier-Haack reagent (DMF-POCl3) were evaluated as a promising approach toward the synthesis of trisubstituted non-symmetric pyrazoles. It was found that either 1,3,4-trialkylpyrazoles or 1,3-dialkylpyrazole-4-carbaldehydes could be obtained in these transformations in high yields (72-83%), in a regioselective manner. (C) 2014 Elsevier Ltd. All rights reserved.