Hexamethylenetetramine → N1-(5-formyl-2-methoxybenzyl)-2,4-dichlorobenzamide

Participants

Reaction Conditions

Reaction Steps

9.04 g of hexamethylene tetramine was added to a solution of 10.0 g N1-(2-methoxybenzyl)-2,4-dichlorobenzamide in trifluoroacetic acid (200 mL), followed by stirring at 50° C. for 23 hours. The reaction solution was left and cooled to room temperature and then concentrated. The residue was diluted with ice-water and adjusted to pH 11 to 12 with 1N aqueous sodium hydroxide solution. The solution was extracted with ethyl acetate. The organic layer was washed with 1 N aqueous sodium hydroxide solution (×3), 1 N hydrochloric acid (×2) and brine, dried over anhydrous sodium sulfate and filtered thorough 100 g silica gel. After concentrating the filtrate, the residue was suspended in ethyl acetate. The solid was collected by filtration and washed with ethyl acetate, to give 7.15 g of N1-(5-formyl-2-methoxybenzyl)-2,4-dichlorobenzamide as a colorless solid.

Provenance & Evidence