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Method of optically pure erythro-(-)-3-(2-aminophenylthio)-2-hydroxy-3-(4-methoxyphenyl)propanoic acid production
CS271143B1
Czechoslovakia
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English - Inventor
Jiri Pharmdr Hrbata Josef Ing Csc Hajicek Ladislav Strojil Eva Skacelova Pavel Pihera Milan Rndr Ferenc
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Description
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Claims (2)
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- PŘEDMĚT VYNÁLEZU1·Způsob výroby opticky čisté kyseliny erythro-(-)-3-(2-eminofenylthio)-2-hydroxy-3-(4-methoxyfenyl)propanové, vyznačující se tím, že se částečně opticky aktivní surová kyselina ponechá krystalovat s (-)-efedrinem v množství 1 ekvivalentu v prostředí methanolu, ethanolu nebo 2-propanolu v rozmezí teplot +6 až 4-40 °C·
- 2·Způsob výroby podle bodu 1, vyznačující se tím, že se krystalizace provádí popřípadě v přítomnosti až 50 objemových dílů vody nebo inertního organického rozpouštědla, například acetonu nebo ethylacetátu·