Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1994-12-09
1996-07-02
Chan, Nicky
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D31172
Patent
active
055323871
ABSTRACT:
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.
Matsui Makoto
Yamamoto Hisashi
Chan Nicky
Eisai Co. Ltd.
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