Acetic Acid → Ethyl 2-(2-methoxycarbonylbenzyliden)-4,4-diethoxyacetoacetate

Participants

Reaction Steps

2-(i) To a mixture of methyl 2-formylbenzoate (4.92 g), ethyl 4,4-diethoxyacetoacetate (7.2 g) and acetic acid (0.36 g) in benzene (15 ml) was added portionwise each one third portion of a solution of piperidone (306 mg) in benzene (5 ml) for each 20 minutes' interval, and the mixture was heated to reflux for 3 hours under removing off azeotropically the resulting water. After cooling, the reaction mixture was diluted with additional benzene (25 ml), washed three times with water and successively with diluted aqueous sodium bicarbonate solution, water and saturated aqueous sodium chloride solution and dried over magnesium sulfate. The solvent was distilled off under reduced pressure to give reddish oil (12.7 g) of crude ethyl 2-(2-methoxycarbonylbenzyliden)-4,4-diethoxyacetoacetate which was used in the following reaction without any further purification.

Provenance & Evidence