申请人:DE-BI DERIVATI BIOLOGICI INTERNATIONAL S.p.A.
公开号:EP0149263A2
公开(公告)日:1985-07-24
A process for preparing a-L-aspartyl-L-phenylalanine methyl ester:
in which:
a) the compound methyl N(a-L-aspartyl)a-aminocinn- amate, protected at the nitrogen, of formula:
where R is a protector group at the nitrogen, is subjected to hydrogenation at the olefin bond by means of gaseous hydrogen in the presence of a hydrogenation catalyst, to give the compound of formula:
where R has the aforesaid meaning, in the form of a mixture of a-L-aspartyl-L-phenylalanine methyl ester protected at the nitrogen, and α-αL-aspartyl-D-phenylalanine methyl ester protected at the nitrogen;
b) the protector group is removed from said a-L-aspartyl-L-phenylalanine and a-L-aspartyl-D-phenylalanine methyl esters protected at the nitrogen;
c) the a-L-aspartyl-L-phenylalanine methyl ester is separated and recovered from said deprotection reaction product.
一种制备 L-天冬氨酰-L-苯丙氨酸甲酯的工艺:
其中
a) N-(a-L-天冬氨酰)-a-氨基辛-氨甲酸甲酯化合物,氮端受保护,其式如下
式中 R 为氮上的保护基,在氢化催化剂存在下,通过气态氢在烯烃键处进行氢化,得到 式中化合物:
其中 R 具有上述含义,以氮保护的 a-L-天冬氨酰-L-苯丙氨酸甲酯和氮保护的 α-α-L-天冬氨酰-D-苯丙氨酸甲酯混合物的形式存在;
b) 从所述受氮保护的 a-L-天冬氨酰-L-苯丙氨酸和 a-L-天冬氨酰-D-苯丙氨酸甲酯中去除保护基;
c) 从所述脱保护反应产物中分离并回收 a-L-天冬氨酰-L-苯丙氨酸甲酯。