申请人:G. D. Searle & Co.
公开号:US04555362A1
公开(公告)日:1985-11-26
This invention encompasses a method and intermediates for preparing a commercial sweetening agent, .alpha.-L-aspartyl-L-phenylalanine methyl ester. The process involves reacting L-aspartic acid with diketene to form N-acetoacetyl-L-aspartic acid which is converted to N-acetoacetyl-L-aspartic anhydride by reaction with acetic anhydride. N-acetoacetyl-L-aspartic anhydride is reacted with L-phenylalanine methyl ester to provide N-acetoacetyl-.alpha.-L-aspartyl-L-phenylalanine methyl ester which is converted to .alpha.-L-aspartyl-L-phenylalanine methyl ester by reaction with hydroxylamine hydrochloride.
这项发明涵盖了一种制备商业甜味剂α-L-天冬氨酸基-L-苯丙氨酸甲酯的方法和中间体。该过程涉及将L-天冬氨酸与二酮乙烯酯反应,形成N-乙酰乙酰-L-天冬氨酸,然后通过与乙酸酐反应将其转化为N-乙酰乙酰-L-天冬氨酸酐。N-乙酰乙酰-L-天冬氨酸酐与L-苯丙氨酸甲酯反应,提供N-乙酰乙酰-α-L-天冬氨酸基-L-苯丙氨酸甲酯,然后通过与盐酸羟胺反应将其转化为α-L-天冬氨酸基-L-苯丙氨酸甲酯。