Hydrochloric Acid → N-(4-diethylamino-2-butynyl)benzoylformamide

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Reaction Conditions

Reaction Steps

N-(2-propynyl)benzoylformamide (0.36 g), 80% paraformaldehyde (90 mg) and diethylamine (162 mg) were added to anhydrous dioxane, 4 mg cuprous chloride was further added, and the mixture was heated at 70 to 80° C. for 1.5 hours with stirring. After cooling to room temperature, the reaction mixture was acidified with 5% hydrochloric acid. The separated aqueous layer was collected and washed with diethyl ether, 5% aqueous solution of caustic soda was added under ice cooling to make the solution weakly alkaline, and the alkaline solution was extracted with diethyl ether. The etheral extract was washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The oily residue thus obtained was purified by silica gel column chromatography (Wako Gel C-200; chloroform), giving 0.39 g of the objective compound.

Provenance & Evidence