申请人:Daiichi Pharmaceutical Co., Ltd.
公开号:US05849945A1
公开(公告)日:1998-12-15
The present invention pertains to a process for the preparation of Compound (4) through the below-described reaction route: ##STR1## wherein R.sup.1 and R.sup.2 each represents H, halogen, OH or C.sub.1-6 alkyl group; X and Y each represents a protected amino group and n stands for 0 to 4. According to the above process, an aminotetralone derivative which is an intermediate useful for an industrial preparation of a camptothecin derivative can be obtained in a convenient manner and in a high yield.
本发明涉及一种通过以下描述的反应路线制备化合物(4)的方法:##STR1## 其中R1和R2各自代表H、卤素、OH或C1-6烷基;X和Y各自代表保护的氨基,n代表0至4。根据上述方法,可以方便且高效地产出一种氨基四氢萘酮衍生物,该衍生物是一种工业上制备喜树碱衍生物的有用中间体。