Abstract: This invention is directed to a method for efficiently separating and purifying 13-dehydroxybaccatin III and 10-deacetylpaclitaxel with a high purity of 90% or higher purity, preferably 99.5% or higher purity, from taxane-containing materials such as Taxus species, and the thusly obtained highly pure 13-dehydroxybaccatin III and 10-deacetylpaclitaxel can be used as semi-synthetic precursors of paclitaxel and/or docetaxel that are anticancer agents.

Abstract: This invention is directed to a method for the preparation of docetaxel having an amorphous, anhydrous crystalline, or hydrated crystalline structure. In accordance with the invention, highly pure amorphous, anhydrous crystalline, or hydrated crystalline docetaxel can be produced with a high yield by using a solvent precipitation method, colloid formation method, etc.

Abstract: This invention relates to methods for purification of paclitaxel from a paclitaxel-containing material. The method comprises the following steps: (a) extracting a paclitaxel-containing material with an organic solvent to obtain an extract, and concentrating the extract; (b) adding the concentrate with an organic solvent which is not mixed with water to separate an organic solvent phase and then concentrating; (c) subjecting the concentrate to normal phase chromatography to obtain an eluate; (d) dissolving the eluate in an acetone or dichloromethane followed by adding pentane or hexane to form a precipitate; and (e) subjecting the precipitate to high performance liquid chromatography. According to the method of the present invention, paclitaxel of over 99.5% purity can be easily obtained from a Taxus genus plant with a high yield.

Abstract: This invention is directed to a method for efficiently separating and purifying 13-dehydroxybaccatin III and 10-deacetylpaclitaxel with a high purity of 90% or higher purity, preferably 99.5% or higher purity, from taxane-containing materials such as Taxus species, and the thusly obtained highly pure 13-dehydroxybaccatin III and 10-deacetylpaclitaxel can be used as semi-synthetic precursors of paclitaxel and/or docetaxel that are anticancer agents.

Abstract: This invention relates to methods for purification of paclitaxel from a paclitaxel-containing material. The method comprises the following steps: (a) extracting a paclitaxel-containing material with an organic solvent to obtain an extract, and concentrating the extract; (b) adding the concentrate with an organic solvent which is not mixed with water to separate an organic solvent phase and then concentrating; (c) subjecting the concentrate to normal phase chromatography to obtain an eluate; (d) dissolving the eluate in an acetone or dichloromethane followed by adding pentane or hexane to form a precipitate; and (e) subjecting the precipitate to high performance liquid chromatography. According to the method of the present invention, paclitaxel of over 99.5% purity can be easily obtained from a Taxus genus plant with a high yield.