Hydrochloric Acid → 2-(3-Amino-5-methyl-1H-pyrazol-4-YL)-benzothiazole-6-carboxylic acid methyl ester

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Reaction Steps

A solution of 2-(3-amino-5-methyl-1H-pyrazol-4-yl)-benzothiazole-6-carboxylic acid (1.52 g, 5.5 mmol) in 500 mL of anhydrous methanol containing HCl gas was heated to reflux for 5 hrs. The excess methanol was removed by distillation and the solution was neutralized by the addition of a solution of saturated sodium carbonate. The resulting solids were isolated by filtration to yield 500 mg of the title compound as a yellow solid. MS (m/z, ES+): 289.1 (M+1,100%).

Provenance & Evidence