2(3H)-Benzoxazolone → 6-(3-Chloropropanoyl)-1,3-benzoxazol-2(3H)-one

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Reaction Steps

56.1 g (0.42 mole) of aluminum chloride are weighed into a ground-necked flask, 10 cm3 of dimethylformamide are then added using a dropping funnel and the mixture is left stirring until it becomes homogeneous. 8.1 g (0.06 mole) of benzoxazolinone are then added and the mixture is left stirring for 10 minutes before adding (0.072 mole) of 3-chloropropionic acid chloride. This mixture is maintained in an oil bath at 80°-85° C. for approximately 2 hours 30 minutes. After cooling, the reaction mixture is poured into ice-cold water. The precipitate is drained and washed with water to neutrality. The product is recrystallized in ethanol.

Provenance & Evidence