Process for producing d-chiro-inositol

C - Chemistry – Metallurgy – 07 – C

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C07C 35/16 (2006.01) C07C 29/10 (2006.01)

Patent

CA 2168953

An aqueous solution of kasugamycin or its salt is either mixed with a strongly acidic ion-exchange resin of the H+-form in a reaction vessel, or is brought into contact with a strongly acidic ion-exchange resin of the H+-form in a column containing said resin, followed by heating said aqueous solution and the resin under an atmospheric pressure or an elevated pressure, thereby to effect hydrolytic reaction of kasugamycin. By this reaction, an acidic reaction solution containing D-chiro- inositol is produced. This acidic reaction solution containing D-chiro-inositol is separated from said strongly acidic ion-exchange resin. Subsequently, D-chiro-inositol is recovered from said reaction solution. For this recovery, said acidic reaction solution is passed succes- sively through a column of a strongly acidic ion-exchange resin of the H+-form and through a column of a strongly basic ion exchange resin of the OH--form, so that a neutral aqueous eluate containing D-chiro-inositol is obtained. This neutral aqueous eluate is then concentrated and crystals of D-chiro-inositol are made to deposit, whereby D-chiro-inositol of a high purity can be harvested with high efficiency.

Un procédé permettant de produire du D-chiro-inositol, consiste soit à mélanger une solution aqueuse de kasugamycine ou un de ses sels avec une résine échangeuse d'ions fortement acidifère (du type H<+>) dans un réacteur, soit à amener la solution aqueuse en contact avec la résine dans une colonne qui en est garnie, à chauffer la solution aqueuse et la résine sous pression normale ou accrue pour hydrolyser la kasugamycine et préparer ainsi une solution de réaction acidifère contenant le D-chiro-inositol, puis à séparer cette solution de la résine et à récupérer le D-chiro-inositol présent dans cette solution. A ce stade, on peut obtenir efficacement un D-chiro-inositol à haute pureté en faisant passer la solution de réaction acidifère d'abord au travers d'une colonne garnie d'une résine échangeuse d'ions fortement acidifère (du type H<+>) puis au travers d'une autre colonne garnie d'une résine échangeuse d'ions fortement basique (du type OH<->) pour préparer un éluat neutre contenant le D-chiro-inositol, et en concentrant cet éluat pour provoquer le dépôt des cristaux de D-chiro-inositol.

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