申请人:Takeda Chemical Industries, Ltd.
公开号:US04898947A1
公开(公告)日:1990-02-06
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 the meaning given above) with a halogenating agent or sulfonyl halide to give a compound of the formula: ##STR3## (wherein R.sup.1 has the 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: ##STR5## (wherein R.sup.1 has the meaning given above), (3) reacting the resulting compound with a compound of the formula: ##STR6## to give a compound of the formula: ##STR7## (wherein R.sup.1 has the meaning given above), and (4) subjecting the resulting compound to catalytic reduction.
公式:##STR1##(其中R.sup.1是氢或较低的烷基)可以通过以下方法优势地制备:(1)将公式为##STR2##(其中R.sup.1具有上述给定的含义)的化合物与卤化剂或磺酰卤反应,得到公式为##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)的化合物,(2)将所得化合物与公式为##STR4##的化合物反应,得到公式为##STR5##(其中R.sup.1具有上述给定的含义)的化合物,(3)将所得化合物与公式为##STR6##的化合物反应,得到公式为##STR7##(其中R.sup.1具有上述给定的含义)的化合物,(4)将所得化合物进行催化还原。