1-Aminocyclohexanecarboxylic acid → 1-[(2-Furanylcarbonyl)amino]cyclohexanecarboxylic acid

Participants

Reaction Conditions

Reaction Steps

71.6 g (0.5 mol) of 1-aminocyclohexanecarboxylic acid was added to 20 g (0.5 mol) of sodium hydroxide in 250 ml of aqueous solution, and the mixture was stirred at 80° C. for 2 hours. The mixture solution was cooled by ice-water, 71.8 g (0.2 mol) of 2-furancarbonyl chloride and 24 g (0.6 mol) of sodium hydroxide in 100 ml of aqueous solution were simultaneously added thereto over approximately 1 hour. The reaction solution was slowly returned to room temperature and stirred overnight. 80 ml of ethyl acetate was added to the reaction solution and after the mixture was stirred for 1 hour, the insolubles were removed by filtration. The aqueous layer was separately collected, and 49 ml of concentrated hydrochloric acid was added thereto under ice-cooling. The precipitated crystal was collected by filtration and dried under reduced pressure to obtain 112.6 g (95%) of the title compound.

Provenance & Evidence