反应详情

A solution of 2-methyl-4-[(phenylmethyl)oxy]-1H-benzimidazole-6-carbonitrile (3.82 g, 14.5 mmol, STEP 3) and potassium hydroxide (85%, 10.2 g, 15.4 mmol) in ethylene glycol (50 mL) was heated to 170° C. for 20 minutes in the microwave synthesizer (Biotage, Emrys Optimizer). After cooling to room temperature, the mixture was acidified with 2M hydrochloric acid aqueous solution (pH=3). The precipitated solid was collected by filtration to afford the title compound as a white solid (3.83 g, 93%).

1. filtrationThe precipitated solid was collected by filtration