Dimethylformamide dimethyl acetal → tert-Butyl 3-[(dimethylamino)methylidene]-4-oxopyrrolidine-1-carboxylate

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Reaction Steps

A solution of 1-(tert-butoxyl carbonyl)-3-pyrrolidone (4.10 g) and N,N-dimethylformamide dimethyl acetal (30.0 mL) was heated to 140° C. for 1 h. The resulting mixture was cooled to room temperature and concentrated under reduced pressure. The residue was redissolved in a minimum amount of dichloromethane and triturated with hexane to yield a yellow precipitate. LC-MS=241.1 (M+1).

Provenance & Evidence