An L-aspartyl-L-phenylalanine lower alkyl ester of which the amino group of the aspartyl residue is protected with a formyl group can be deformylated under selected conditions, i.e. in a strong acid, having a specific normality range at a specific elevated temperature range, and the splitting of the formyl group from the aspartyl moiety amino group can be effected selectively and efficiently in a short time (e.g. as short as 15 seconds to 60 minutes), while the splitting of the ester bond or the peptide bond is suppressed. The deformylation is useful in the production of a-L-aspartyl-L-phenylalanine methyl ester, a dipeptide sweetener.
天冬
氨酰残基的
氨基被甲酰基保护的 L-天冬
氨酰-
L-苯丙氨酸低级烷基
酯可在选定的条件下,即在具有特定常态范围的强酸中,在特定的升高温度范围内,进行
脱甲酰反应。甲酰基与天冬
氨酰残基
氨基的分离可在短时间内(例如短至 15 秒至 60 分钟)选择性地有效进行,同时
酯键或肽键的分离受到抑制。这种变形作用可用于生产一种二肽
甜味剂--L-天冬
氨酰-
L-苯丙氨酸甲酯。