申请人:Eisai Co., Ltd.
公开号:EP0658552A1
公开(公告)日:1995-06-21
A process is provided for the preparation of an α-tocopherol derivative represented by the following formula (VII):
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(RSO₃)₃], a nitrate [M(NO₃)₃] or a sulfate [M₂(SO₄)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.
提供了一种制备下式 (VII) 所代表的 α-
生育酚衍
生物的工艺:
其中 n 代表 0 或 1 至 5 的整数。根据该工艺,在
氟磺酸盐[M(RSO₃)₃]存在下,三甲基
对苯二酚和特定的烯丙基醇衍
生物或特定的烯丙基醇发生缩合反应、
硝酸盐[M(NO₃)₃]或
硫酸盐[M₂(SO₄)₃],其中 M 代表
钪、
钇或
镧原子,R 代表
氟原子、
氟化低级烷基或可被一个或多个
氟原子取代的芳基。
镧系原子是指
镧、
铈、
镨、
钕、
钷、
钐、
铕、
钆、
铽、
镝、
钬、
铒、
铥、
镱或
镥原子。