Patent ID: 6316657
Filing Date: 2001-11-13
Classification: C07C,C07K

Abstract:
A process for purification of N-(3, 3-dimethylbutyl)-.alpha.-L-aspartyl-L- phenylalanine methy ester comprising:contacting impure N-(3,3-dimethybutyl)-.alpha.-L-aspartyl-L-phenylalanine methyl ester containing at least .alpha.-L-aspartyl-L-phenylalanine methyl ester as an impurity, with mixed solvents having two layers of one layer given from at least one organic solvent which does not mix with water homogenously and one layer of water to extract N-(3,3-dimethylbutyl)- .alpha.-L-aspartyl-L-phenylalamine methyl ester in the organic layer.