申请人:Kyowa Hakko Kogyo Co., Ltd.
公开号:US05602255A1
公开(公告)日:1997-02-11
The present invention relates to a process for producing 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid compounds or salts thereof represented by the following formula (II): ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 independently represent hydrogen, hydroxy or lower alkoxy, and R.sup.4 represent hydrogen, lower alkyl, aryl or aralkyl, the process comprising, allowing phenylalanine compounds to react with formaldehyde or paraformaldehyde in the presence of sulfuric acid or hydrobromic acid, the phenylalanine compounds being represented by the following formula (I): ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the same meaning as defined above.
本发明涉及一种生产1,2,3,4-四氢异喹啉-3-羧酸化合物或其盐的方法,其化学结构如下所示:其中R^1、R^2和R^3分别代表氢、羟基或较低的烷氧基,而R^4代表氢、较低的烷基、芳基或芳基烷基。该方法包括将苯丙氨酸化合物与甲醛或多聚甲醛在硫酸或盐酸存在下反应,其中苯丙氨酸化合物的结构如下:其中R^1、R^2、R^3和R^4的含义与上文定义相同。