申请人:Eisai Co., Ltd.
公开号:US05532387A1
公开(公告)日:1996-07-02
A process is provided for the preparation of an .alpha.-tocopherol derivative represented by the following formula (VII): ##STR1## wherein n stands for 0 or an integer of from 1 to 5. According to the process, trimethylhydroquinone and a particular allyl alcohol derivative or a specific alkenyl alcohol are subjected to a condensation reaction in the presence of a fluorosulfonate [M(RSO.sub.3).sub.3 ], a nitrate [M(NO.sub.3).sub.3 ] or a sulfate [M.sub.2 (SO.sub.4).sub.3 ], wherein M represents a scandium, yttrium or lanthanide atom, and R represents a fluorine atom, a fluorinated lower alkyl group, or an aryl group which may be substituted by one or more fluorine atoms. The lanthanide atom means a lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium or lutetium atom.
提供了一种制备α-生育酚衍生物的方法,该衍生物由以下公式(VII)表示:##STR1## 其中n代表0或1至5的整数。根据该方法,在氟磺酸盐[M(RSO.sub.3).sub.3]、硝酸盐[M(NO.sub.3).sub.3]或硫酸盐[M.sub.2(SO.sub.4).sub.3]的存在下,将三甲基羟基苯和特定的烯丙醇衍生物或特定的烯基醇进行缩合反应,其中M代表钪、钇或镧系原子,R代表氟原子、氟化较低烷基团或苯基团,该苯基团可以被一个或多个氟原子取代。镧系原子表示镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱或镥原子。