4-Aminobenzonitrile → 1-(4-Cyanophenyl)-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 4-aminobenzonitrile (1.04 g, 8.82 mmol) in ethanol (3 mL) was irradiated in a microwave oven for 3 minutes at 100° C. The solution 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 sodium hydrogen phosphate (1M) to pH=2, extracted with ethyl acetate dried and concentrated under reduced pressure to yield 0.240 g (36%) of a brown solid, which was used in the next step without further purification.

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