Process for producing tetrahydroisoquinoline-3-carboxylic acid compounds
    4.
    发明授权
    Process for producing tetrahydroisoquinoline-3-carboxylic acid compounds 失效
    制备四氢异喹啉-3-羧酸化合物的方法

    公开(公告)号:US5602255A

    公开(公告)日:1997-02-11

    申请号:US416512

    申请日:1995-04-04

    IPC分类号: C07D217/26

    CPC分类号: C07D217/26

    摘要: 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.

    摘要翻译: 本发明涉及由下式(II)表示的1,2,3,4-四氢异喹啉-3-羧酸化合物或其盐的制备方法:其中R1,R2和R3独立地表示 氢,羟基或低级烷氧基,R 4代表氢,低级烷基,芳基或芳烷基,该方法包括使苯丙氨酸化合物与甲醛或多聚甲醛在硫酸或氢溴酸的存在下反应,苯丙氨酸化合物由下列 式(I):其中R 1,R 2,R 3和R 4具有与上述相同的含义。