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Methylation of 4-nitro-3(5)-pyrazolecarboxylic acid
Authors:Andrzej Regiec  Agnieszka Mastalarz
Affiliation:a Department of Organic Chemistry, Faculty of Pharmacy, Wroc?aw Medical Academy ul. Grodzka 9, 50-137 Wroc?aw, Poland
b Faculty of Chemistry, Wroc?aw University, 14 F. Joliot-Curie Street, 50-383 Wroc?aw, Poland
Abstract:Reactions of 4-nitro-3(5)-pyrazolecarboxylic acid dipotassium salt with different methylating agents in various solvents have been investigated to improve the synthesis of isomeric 1-methyl-4-nitro-3- and -5-pyrazolecarboxylic acids.
Keywords:Pyrazoles   Selective methylation   Regiochemistry   Chemoselectivity
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