3-Pyridinecarboxaldehyde → 5-(Benzoxazol-2-yl)-2-(3-pyridyl)-1-(tetrahydropyran-4-yl)benzimidazole

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Reaction Steps

5-(Benzoxazol-2-yl)-2-(tetrahydropyran-4-yl)aminoaniline (see Working Example 20-2) (0.15 g, 0.484 mmol) was dissolved in DMF (3 mL) and water (0.1 mL), 3-pyridinecarboxaldehyde (0.06 g, 0.561 mmol) was added followed by oxone (0.19 g, 0.310 mmol), and this was stirred at room temperature for 2.5 hours. Aqueous potassium carbonate solution (0.09 g/15 mL) was added to the reaction solution. This was extracted with chloroform, washed with water, and after drying over magnesium sulfate, this was concentrated and purified by silica gel column chromatography. The crystals obtained were washed with hexane and a small amount of ethyl acetate, and dried to yield the title compound (95.0 mg, 49.5% yield) as white crystals.

Provenance & Evidence