Preparation of methyl ester of alpha-L-aspartyl-L-phenyl alanine or one of its hydrohalide.

OBTAIN METHYL ESTER (ALFA) -L-aspartyl-L-Phenylalanine OR ITS hydrohalide esterifying (ALFA) -L-aspartyl-L-Phenylalanine O (ALFA) -L-aspartyl-L-phenylalanine HAS BEEN OBTAINED IN SITU A TRYING (ALFA) -L-aspartyl-L-phenylalanine N PROTECTED IN An aqueous solution SULFURIC ACID AQUEOUS sOLUTION OR CONTAINING SULFURIC ACID IN THE PRESENCE OF mETHANOL a metal halide or alkaline alkaline earth metal in a medium composed sULFURIC ACID, water and methanol, which SEPERMITE THE METHYL eSTER (ALFA) -L-aspartyl-L-phenylalanine RESULTING hydrohalide precipitate and its corresponding, then isolating the hydrohalide, AND WHEN YOU WANT OBTAIN methylester neutralizing the hydrohalide.