abstract |
THE OBJECT OF THE INVENTION IS TO MANUFACTURE THE METHYL ESTER OF A-L-ASPARTYL-L-PHENYLALANINE. ACCORDING TO THE INVENTION, 3-BENZYL-6-CARBOXYMETHYL-2,5-DICETOPIPERAZINE IS CONTACT WITH A STRONG ACID IN A SOLVENT MIXTURE COMPRISING METHANOL AND WATER FOR A SUFFICIENT TIME TO CAUSE PARTIAL HYDROLYSIS. |