Gauchers disease type I; Niemann Pick disease type C
EP-03031800, Process for the preparation of high purity miglustat
Navinta, LLC ; Shah, Shrenik K. ; Kharatkar, Raju Mahadev ; Bhatt, Chiragkumar Anilkumar ; Kevat, Jitendra Bhagwandas
The present invention provides a process for the preparation and isolation of crystalline miglustat without the use of a column chromatography or ion exchange purification. The crystalline miglustat has a high purity and a melting point of 128 °C and an endothermic peak is 133 °C.
Process for preparing and isolating crystalline form of miglustat with a high purity is claimed. Represents a first PCT filing from the inventors on miglustat. Actelion, under license from Oxford GlycoSciences (OGS; then Celltech, now UCB), which licensed the compound from GD Searle & Co, has developed and launched miglustat.
Product patent WO9426714, will expire in the US in 2018.
Kharatkar is affiliated with Sterling Biotech, Bhatt is affiliated with Intas and Kevat is affiliated with Orchid Chemicals & Pharmaceuticals.
INVENTORS Shah, Shrenik K.; Kharatkar, Raju Mahadev; Bhatt, Chiragkumar Anilkumar; Kevat, Jitendra Bhagwandas
Navinta, LLC in Ewing, N.J. is a technology driven Pharmaceutical Company that focuses on novel routes of synthesis of new and existing drug molecules, complex pharmaceutical ingredients, novel formulations of liquid dosage form, novel oral dosage form, novel injectable dosage form and implantable drug delivery devices. Navinta has currently at least fifteen (15) patents granted or pending with the United States Patent and Trademark Office.
EP-03031800 LINK EMBEDDED
Miglustat is a potent inhibitor of glycosyltransferase. It is primarily used in the treatment of Gaucher’s disease. Miglustat is chemically known as N-butyl-1,5-dideoxy-1,5-imino-D-glucitol of formula (I) and is sometimes referred as N-butyl-1-deoxynojirimycin. Miglustat is a white to off-white crystalline solid with a melting point of 125-126° C. Its empirical formula is C10H21NO4 and has a molecular weight of 219.28 g/mol.
Synthesis of 2, 3, 4, 6-tetra-O-benzyl-N-butyl-1-deoxynojirimycin hydrochloride of Formula (VI)
To a solution of 2, 3, 4, 6-tetra-O-benzyl-1-deoxynojirimycin hydrochloride (V) (prepared as in Organic Process Research & Development, 2008, 12, 414-423) (45 g, 0.08 mol) in 1575 mL of methanol, n-butyraldehyde (21.6 g, 0.24 mol) and sodium cyanoborohydride (25.2 g, 0.4 mol) were added and stirred. The reaction was maintained under stirring at a temperature from about 25.degree. C. to about 30.degree. C. After the completion of the reaction, the reaction was quenched by adding 765 ml of 10% HCl in methanol, while keeping the temperature between 25.degree. C. to 30.degree. C. The reaction mass was cooled to 0.degree. C. to 5.degree. C. and the resulting precipitate solids were filtered. The filtrate was treated with aqueous HCl and the solid formed was filtered, suspended in 1 N HCl, stirred for 1 hour and filtered. The collected solid was washed with diisopropylether and dried under vacuum to furnish 46.2 g of compound (IV) (46.2 g, 0.075 mol, 94% yield) of high chemical purity based on HPLC analysis (>99.0%).
Synthesis of Miglustat Hydrochloride of Formula (III)
A solution of 2, 3, 4, 6-tetra-O-benzyl-N-butyl-1-deoxynojirimycin hydrochloride (VI) (100 g, 0.16 mol) in methanol (1000 mL), 10% HCl solution in methanol (100 mL), and 10% Pd/C (50% wet) (10 g) were mixed and stirred under hydrogen atmosphere at a temperature of about 25.degree. C. to about 30.degree. C. until completion of the reaction. The reaction mass was filtered and the solvent was removed from the filtrate by rotary evaporation. Ethyl acetate (1000 mL) was added to the residue from the rotary evaporation to precipitate the solid. The solid was filtered and dried to isolate Miglustat hydrochloride (III) (42 g, 0.16 mol, 100% yield) of >99.5% purity as measured by HPLC analysis. The DSC thermogram of this product is provided as FIG. 3, and the FTIR spectrum of this product is provided as FIG. 4.
Synthesis of Miglustat of Formula (I)
Miglustat hydrochloride (III) (42 g, 0.16 mol) obtained from Example 2 was dissolved in 420 mL of methanol and DBU (1,8-diazabicycloundec-7-ene) (34.1 mL) was added. The reaction mass was warmed slightly and stirred for about 2 hours. The reaction was concentrated by removal of methanol. Dichloromethane (900 mL) was added to the residue. The resulting solid was filtered and dried to obtain crystalline miglustat (I) (27 g, 0.12 mol, 75% yield) of >99.5% purity as measured by HPLC analysis. The melting point of the crystalline miglustat (I) is 128.degree. C. The DSC thermogram and FTIR spectrum of the product are provided as FIG. 1 and FIG. 2, respectively. The crystalline miglustat (I) contained <0.05% of the 5R isomer (IV) as measured by HPLC.