Dimethylformamide dimethyl acetal → tert-butyl 3-[(dimethylamino)methylene]-4-oxotetrahydro-1(2H)-pyridinecarboxylate

Participants

Reaction Steps

Dimethoxymethyl-dimethyl-amine (DMA) 35.5 ml (266 mmol) was added to a solution of 4-oxo-piperidine-1-carboxylic acid tert-butyl ester 10.59 g (53.14 mmol) in toluene (50 ml) with stirring and with nitrogen as inert gas and refluxing was performed for 3.5 h. After removal of the solvent, the product 3-dimethylaminomethylene-4-oxo-piperidine-1-carboxylic acid tert-butyl ester was obtained, which was used in the subsequent reaction without further purification.

Provenance & Evidence