Acetaldehyde → 5-(Benzoxazol-2-yl)-2-methyl-1-tert-butoxycarbonylmethylbenzimidazole

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Reaction Steps

To a solution of 2-(2-(tert-butoxycarbonylmethylamino)anilin-5-yl)benzoxazole (see Working Example 91-1) (120 mg, 0.353 mmol) in dimethylformamide (2 mL) was added an aqueous solution of acetaldehyde (approx. 90%, 66 μL, 1.06 mmol) and oxone (217 mg, 0.353 mmol), and this was stirred at room temperature for 2 hours. After the reaction was complete, aqueous potassium carbonate solution was added, this was filtered and washed with water. The crystals obtained were purified by silica gel column chromatography to yield the title compound (30.7 mg, 24% yield) as white crystals.

Provenance & Evidence