Process for preparing paclitaxel
    4.
    发明授权
    Process for preparing paclitaxel 失效
    制备紫杉醇的方法

    公开(公告)号:US6130336A

    公开(公告)日:2000-10-10

    申请号:US242736

    申请日:1999-02-23

    摘要: The present invention elates to a process for preparing paclitaxel represented by formula (1) characterized in that: (a) an oxazolidine derivative represented by formula (2) or its salt in which X represents halogen, is coupled with a 7-trihaloacetyl-baccatin III represented by formula (3) in which R.sub.1 represents trihaloacetyl, in a solvent in the presence of a condensing agent to produce an oxazolidine substituent-containing taxane represented by formula (4) in which X and R.sub.1 are each as previously defined; (b) the oxazolidine ring is opened in a solvent in the presence of an acid, and the product thus obtained is reacted with benzoyl chloride in the presence of a base to produce a protected paclitaxel wherein the hydroxy group at 7-position is protected with trihaloacetyl group represented by formula (5) in which R.sub.1 is as previously defined; (c) then the protecting group at 7-position is removed by ammonia or a salt of ammonia with a weak acid in a solvent.

    摘要翻译: PCT No.PCT / KR97 / 00157 Sec。 371日期1999年2月23日 102(e)1999年2月23日PCT PCT 1997年8月25日PCT公布。 出版物WO98 / 08832 1998年3月5日本发明涉及一种制备式(1)表示的紫杉醇的方法,其特征在于:(a)式(2)表示的恶唑烷衍生物或其中X表示卤素的盐与 由式(3)表示的7-三卤乙酰基浆果赤霉素III,其中R 1表示三卤代乙酰基,在溶剂中,在缩合剂存在下制备由式(4)表示的含恶唑烷取代基的紫杉烷,其中X和R 1各自为 以前定义; (b)在酸存在下,在溶剂中打开恶唑烷环,将得到的产物与苯甲酰氯在碱的存在下反应,得到保护的紫杉醇,其中7位的羟基被 由式(5)表示的三卤代乙酰基,其中R 1如前所定义; (c)然后在溶剂中用氨或氨与弱酸将7位保护基除去。