Process for production of diacetylrhein

Details Process for production of diacetylrhein Process for production of diacetylrhein

1994-04-29

1995-02-21

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Polycyclo ring system containing anthracene configured ring...

C07C 5034

Patent

active

053917758

ABSTRACT:
The present invention provides a process for obtaining diacetylrhein, wherein diacetylrhein containing aloe-emodin components is subjected to a liquid-liquid partitioning between a polar organic solvent which is only partly miscible with water and an aqueous phase of pH 6.5. to 7.5 and the diacetylrhein is recovered and optionally recrystallised.
The present invention is also concerned with diacetylrhein obtainable by this process and with pharmaceutical compositions containing it.

REFERENCES:
patent: 4244968 (1981-01-01), Friedmann
V. K. Murty et al, Chemical Examination of Cassia Fistula, Tetrahedron, 1967, vol. 23, 515 to 518.
Drugs of the Future, vol. IV, No. 6, 1979.
U. R. Zope et al, A short synthesis of diacerhein, Chemistry and Industry, Communication to the Editor, p. 124, Feb. 15, 1988.
Merck Index, 10th ed., 1983, p. 1179.

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