An expeditious, 4-step procedure is described for the conversion of bu
lk-scale accessible D-xylose into 5-hydroxymethyl-1-phenylpyrazole-3-c
arboxaldehyde (3), which, in turn, is converted into various pyrazole
building blocks with versatile application profiles, such as the 1-phe
nylpyrazole-3,5-dicarboxylic acid (9), the respective 3,5-dialdehyde (
10), and 3,5-bis(aminomethyl)-1-phenylpyrazole (13).