申请人:Takeda Chemical Industries, Ltd.
公开号:US04812570A1
公开(公告)日:1989-03-14
A compound of the formula: ##STR1## (wherein R.sup.1 is hydrogen or a lower alkyl) can be produced advantageously by (1) reacting a compound of the formula: ##STR2## (wherein R.sup.1 has a meaning given above) with a halogenating agent or sulfonyl halide to give a compound of the formula: ##STR3## (wherein R.sup.1 has a meaning given above and X is a halogen or an alkyl- or aryl-sulfonyloxy), (2) reacting the resulting compound with a compound of the formula: ##STR4## to give a compound of the formula: (wherein R.sup.1 has the meaning given above), (3) reacting the resulting compound with a compound of the formula: ##STR5## to give a compound of the formula: ##STR6## (wherein R.sup.1 has the meaning given above), and (4) subjecting the resulting compound to catalytic reduction.
化合物的化学式为:##STR1##(其中R.sup.1是氢或较低的烷基),可以通过以下步骤优势地制备:(1)将化合物的式子:##STR2##(其中R.sup.1具有上述给定的含义)与卤化剂或磺酰卤反应,得到化合物的式子:##STR3##(其中R.sup.1具有上述给定的含义,X是卤素或烷基或芳基磺酰氧基),(2)将所得化合物与化合物的式子:##STR4##反应,得到化合物的式子:(其中R.sup.1具有上述给定的含义),(3)将所得化合物与化合物的式子:##STR5##反应,得到化合物的式子:##STR6##(其中R.sup.1具有上述给定的含义),(4)将所得化合物进行催化还原。