Synthesis of 5-substituted 1-aryl-1<i>H</i>-pyrazole-4-acetonitriles, 4-methyl-1-phenyl-1<i>H</i>-pyrazole-3-carbonitriles and pharmacologically active 1-aryl-1<i>H</i>-pyrazole-4-acetic acids
Lithiumaluminumhydridereduction of 5-substituted or unsubstituted ethyl or methyl 1-aryl-1H-pyrazole-4-carboxylates gave, generally in excellent yields, 5-substituted or unsubstituted 1-aryl-1H-pyrazole-4-methanols which afforded the corresponding 1-aryl-4-(bromomethyl)-1H-pyrazoles with hydrobromic acid in acetic acid solution. These crude intermediates gave by reaction with potassium cyanide in