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Title:
PRODUCTION OF GINSENOSIDE RH2
Document Type and Number:
Japanese Patent JPH08208688
Kind Code:
A
Abstract:

PURPOSE: To obtain ginsenoside Rh2 useful as raw material for a medicine such as a carcinostatic agent and a perfume by oxidizing a specific terpene with a carbonyl compound, acetylating, reducing, reacting the resultant substance with a halogenated saccharide and further treating an alkali metal alkoxide.

CONSTITUTION: A terpene of formula I (A is 3α-OH or 3β-OH) is oxidized with a carbonyl compound of the formula R2COR3 (R2 and R3 are each a 2-10C alkyl or alkylaryl) in the presence of an Al trialklxide of the formula Al(OR1)3 (R1 is a 1-10C alkyl) to give 3-keto-betulafolienetriol. Then 3-keto- betulafolienetriol is acetylated, reduced to give 12-acetyl-protopanaxadiol, which is reacted with an α-glucopyranosyl halide tetraalkylate, treated with an alkali metal alkoxide in an alcohol and a protecting group is removed to give the objective ginsenoside Rh2 of formula III.


Inventors:
AEBA KEIZO
OKAWA NAOSHI
OGAWA NORIYUKI
GOTOU TOMOHIRO
Application Number:
JP30964494A
Publication Date:
August 13, 1996
Filing Date:
November 18, 1994
Export Citation:
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Assignee:
NEOS KK
International Classes:
A61K31/70; A61P35/00; B01J31/02; C07B61/00; C07J17/00; (IPC1-7): C07J17/00; B01J31/02