Acetic Acid → N-(Benzyloxycarbonyl)-L-aspartyl-L-phenylalanine methyl ester

Participants

Reaction Steps

To 24.9 g (0.1 mole) of N-benzyloxycarbonyl-L-aspartic acid anhydride in 100.4 g of ethyl acetate were added 21.6 g (0.1 mole) of L-phenylalanine methyl ester hydrochloride and 7.6 g (0.055 mole) of potassium carbonate dissolved in 9.3 g of water. The reaction was carried out for 3 hours with stirring at 15°-20 C. Thereafter, 100.4 g of acetic acid and 75.3 g of water was added to the concentrate and the mixture was stirred for one hour at 15°-20.C. Precipitated crystals were filtered, washed and dried to obtain crystals of N-benzyloxycarbonyl-α-L-aspartyl-L-phenylalanine methyl ester.

Provenance & Evidence