3-Fluoroaniline → 1-(3-Fluorophenyl)-2-oxopyrrolidine-3-carboxylic acid

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A mixture of 6,6-dimethyl-5,7-dioxaspiro[2.5]octane-4,8-dione (0.500 g; 2.94 mmol) and 3-fluoroaniline (0.847 mL; 8.82 mmol) in ethanol (3 mL) was irradiated in a microwave oven for 3 minutes at 100° C. The mixture was concentrated under reduced pressure and the residue was dissolved in a solution of sodium hydroxide 6N, washed with dichloromethane, acidified with a solution of hydrochloric acid 6N to pH=2, extracted with ethyl acetate dried and concentrated under reduced pressure to yield 0.560 g (85%) of a dark orange solid, which was used in the next step without further purification.

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