Abstract: A method is disclosed for preparing pyrazole derivative 3-bromo-5-methyl-1-H-pyrazole-N-2-chloropyridine (compound of Formula I) by reacting of a compound of Formula II with halogen substituted pyridine optionally in the presence of base and organic solvent or by decarboxylation of pyrazole carboxylic acid of Formula XI in the presence of acid. In addition, provided a method of preparation of synthetic precursors of Formula II, Formula IV, Formula V, Formula VI, Formula XI, and a method of preparing a compound of Formula VII comprising reacting a compound of Formula I with an oxidant optionally in the presence of a catalyst. Also disclosed a compound of Formula I as useful synthetic precursor for preparation of anthranilamide of Formula VIII.