Method of preparing .alpha.-L-aspartyl-L-phenylalanine methyl es

Details Method of preparing .alpha.-L-aspartyl-L-phenylalanine methyl es Method of preparing .alpha.-L-aspartyl-L-phenylalanine methyl es

1992-05-20

1993-09-28

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C07C10352

Patent

active

052488063

ABSTRACT:
An acid addition salt of .alpha.-APM is dissolved or suspended in an aqueous medium at 50.degree. C. or lower at a pH of 3 or less and a concentration of the salt of 3 wt.% or more (solution A). A liquid having a pH of 3 or more and containing or not containing .alpha.-APM is prepared (solution B) and gradually mixed with solution A with stirring. The temperature of the liquid mixture is kept to be 40.degree. C. or lower and the pH value of the mixture is kept at 3 or more, optionally adding a base thereto, whereby crystals of .alpha.-APM are precipitated out.

REFERENCES:
patent: 4606854 (1986-08-01), Ozawa et al.
patent: 4618695 (1986-10-01), Ozawa et al.

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