Method of purifying tacrolimus

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 498/18 (2006.01) B01D 15/26 (2006.01)

Patent

CA 2586700

The invention provides pure tacrolimus and a method for purifying tacrolimus in which a loading charge of tacrolimus is placed in juxtaposition with a bed of wet sorption resin, the loading charge and bed are eluted with an eluent comprising THF, acetonitrile, or a combination thereof, water, and, optionally, at least one additional organic solvent, the heart cut of the eluent is collected, and tacrolimus is collected, the tacrolimus is further crystallized and recrystallized until obtaining a reduced level of impurities.

L'invention concerne du tacrolimus pur et un procédé de purification de celui-ci dans lequel une charge de tacrolimus est placée en juxtaposition avec un lit de résine de sorption humide, la charge et le lit étant élués au moyen d'un éluant comprenant THF, acétonitrile ou une combinaison de ceux-ci, de l'eau et éventuellement au moins un solvant organique supplémentaire, la fraction de coeur de l'éluant étant recueillie et le tacrolimus recueilli, puis cristallisé et recristallisé jusqu'à l'obtention d'un niveau réduit d'impuretés.

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