[EN] PROCESS FOR THE PREPARATION OF ALOE-EMODIN<br/>[FR] PROCESSUS DE PRÉPARATION D'ÉMODINE D'ALOÈS
申请人:MEDIDOM LAB
公开号:WO2009106910A1
公开(公告)日:2009-09-03
Process for the preparation of aloe-emodin from aloin comprising oxidizing aloin by treatment with an oxygen containing gas, in an acid reaction medium, in the presence of a copper salt catalyst.
A process for obtaining diacerein with an aloe-emodine content lower thatn 100 ppm, prefereably of 0-5 ppm, is herein disclosed. The process comprises subjecting an an aqueous-organic solution of a diacerein salt with a weak base to extraction with a water immiscible or sparingly water-miscible solvent, such as toluene, aetates of C
2
-C
4
alcohols, halohydrocarbons and the like.
Aloin (10-glucopyranosyl-1,8-dihydroxy-3-hydroxymethyl-9(10H)-anthracenone), a bioactive compound in Aloe vera, although known to have an anticancer effect, has not been used in current drug research. Optimization of the lead structure could enhance the utility of this compound. Hence, aloin was modified using natural amino acids to produce Schiff's base, a potential pharmacophore, and its corresponding aglycones. The synthetic derivatives exhibited significant enhancement in their efficacy toward antioxidant (DPPH radical scavenging) and cytotoxic activities than those of the parent compound, aloin showing promise for application in cancer treatment.