Process for preparing aloe-emodin

Details Process for preparing aloe-emodin Process for preparing aloe-emodin

2005-11-11

2008-11-18

Witherspoon, Sikarl A (Department: 1621)

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

Organic compounds

Polycyclo ring system containing anthracene configured ring...

C552S224000, C568S321000

Reexamination Certificate

active

07453004

ABSTRACT:
A process for preparing aloe-emodin from aloin by oxidizing aloin by treatment with an oxygen-containing gas in the presence of an acid. The aloe-emodin may be used for the production of rhein and diacerein by oxidizing aloe-emodin by treatment with a chromium-free oxidizing medium to obtain rhein and purifying the rhein obtained. The rhein may be acetylated to obtain diacerein.

REFERENCES:
patent: 5652265 (1997-07-01), Vittori et al.
patent: 0 928 781 (2002-03-01), None
Oesterle, O. A. et al., “Aloin”, CAPLUS, vol. 47, 1910, pp. 717-721, XP002341227.
Seel, E., et al., “Products of oxidation of aloin”, CAPLUS, vol. 112, No. 1. 1917, XP002341228.
Vogt, E. et al. “Anthraquinones and anthraquinone glycosides. XX. Partial synthesis of chrysophanol and chrysazin anthraquinones and glucosides. 1”, CAPLUS, vol. 46, No. 7, 1971, pp. 431-440, XP002341229.

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