A new method for the synthesis of 1 methyl 3 propylpyrazole 5 carboxlic acid from 2 pentanone and diethyl oxalate is reported.

以2-戊酮和草酸二乙酯为起始原料,、环、水解等三个步骤成了1--3-丙吡唑-5-羧酸。