Trifluoroacetic anhydride → 2-Phenylcarbonylaminoimidazole

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Reaction Steps

To a solution of 3-furoic acid in 50 ml. of tetrahydrofuran, there is added 10.5 g. of trifluoroacetic anhydride. To the resulting solution, after 30 minutes and at 20°-25°C., there is added 15 ml. of triethylamine and 4.1 g. of 2-aminoimidazole hydrochloride and 20 ml. of tetrahydrofuran. The thus-obtained reaction mixture is allowed to stand overnight at 20° -25°C., followed by concentration, dilution with water, filtration and recrystallization from methanol to yield 2-(3-furylcarbonylamino)-imidazole [(III), R = 3-furyl], identical to that obtained in Example 1A.

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