8.
(11) Patent number: 2158598
(46) Date of publication: 10.11.2000
(51) Int. Cl.7: A 61 K 35/78, C 07 D 311/32
(21) Application number: 98107676/14
(22) Application date: 21.04.1998
(71) Applicant:
Irkutskij institut khimii SO RAN
(72) Inventor:
Babkin V.A.,
Ostroukhova L.A.,
Babkin D.V.,
Malkov Ju.A.
(73) Proprietor:
Irkutskij institut khimii SO RAN
(98) Mail address:
664033, g. Irkutsk, ul. Favorskogo 1, Irkutskij institut khimii SO RA
(54) METHOD OF PREPARING DIHYDROQUERCETIN
(57)
FIELD: pharmaceutical chemistry. SUBSTANCE: invention aims at simplifying preparation of natural bioflavonoid, which is achieved by extraction with ethyl acetate of broken larch wood preliminarily impregnated with water, followed by concentration of extract solution, treating residue with hexane of gasoline, and recrystallization of dihydroquercetin from hot water. EFFECT: eliminated wood deresinification stage and considerably reduced consumption of organic extractants. 1 tbl, 2 ex
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