New patent, WO 2016001885, Dr Reddy’s Laboratories Ltd, Eliglustat hemitartarate

WO 2016001885

DR. REDDY’S LABORATORIES LIMITED [IN/IN]; 8-2-337, Road No. 3, Banjara Hills, Telangana, India Hyderabad 500034 (IN)

VELAGA, Dharma Jagannadha Rao; (IN).
PEDDY, Vishweshwar; (IN).
VYALA, Sunitha; (IN)

(WO2016001885) AMORPHOUS FORM OF ELIGLUSTAT HEMITARTARATE

Chemically Eliglustat is named N-[(1 R,2R)-2-(2,3-dihydro-1 ,4-benzodioxin-6-yl)-2-hydroxy-1 -(1 -pyrrolidinylmethyl)ethyl]-Octanamide(2R!3R)-2,3-dihydroxybutanedioate and the hemitartarate salt of eliglustat has the structural formula as shown in Formula I.

Formula I

Eliglustat hemitartrate (Genz-1 12638), currently under development by Genzyme, is a glucocerebroside (glucosylceramide) synthase inhibitor for the treatment of Gaucher disease and other lysosomal storage disorders. Eliglustat hemitartrate is orally active with potent effects on the primary identified molecular target for type 1 Gaucher disease and other glycosphingolipidoses, appears likely to fulfill high expectations for clinical efficacy. Gaucher disease belongs to the class of lysosomal diseases known as glycosphingolipidoses, which result directly or indirectly from the accumulation of glycosphingolipids, many hundreds of which are derived from glucocerebroside. The first step in glycosphingolipid biosynthesis is the formation of glucocerebroside, the primary storage molecule in Gaucher disease, via glucocerebroside synthase (uridine diphosphate [UDP] – glucosylceramide glucosyl transferase). Eliglustat hemitartrate is based on improved inhibitors of glucocerebroside synthase, and is currently under development by Genzyme.

U.S. patent No. 7,196,205 discloses a process for the preparation of Eliglustat or a pharmaceutically acceptable salt thereof.

U.S. patent No. 6855830, 7265228, 7615573, 7763738, 8138353, U.S. patent application publication No. 2012/296088 discloses process for preparation of Eliglustat and intermediates thereof.

U.S. patent application publication No. 2013/137743 discloses (i) a hemitartrate salt of Eliglustat, (ii) a hemitartrate salt of Eliglustat, wherein at least 70% by weight of the salt is crystalline, (iii) a hemitartrate salt of Eliglustat, wherein at least 99% by weight of the salt is in a single crystalline form.

It has been disclosed earlier that the amorphous forms in a number of drugs exhibit different dissolution characteristics and in some cases different bioavailablity patterns compared to crystalline forms [Konne T., Chem pharm Bull., 38, 2003(1990)]. For some therapeutic indications one bioavailabihty pattern may be favoured over another. An amorphous form of Cefuroxime axetil is a good example for exhibiting higher bioavailability than the crystalline form.

Solid amorphous dispersions of drugs are known generally to improve the stability and solubility of drug products. However, such dispersions are generally unstable over time. Amorphous dispersions of drugs tend to convert to crystalline forms over time, which can lead to improper dosing due to differences of the solubility of crystalline drug material compared to amorphous drug material. The present invention, however, provides stable amorphous dispersions of eliglustat hemitartrate. Moreover, the present invention provides solid dispersions of eliglustat hemitartrate which may be reproduced easily and is amenable for processing into a dosage form.

There remains a need to provide solid state forms of eliglustat hemitartarate which are advantageous in a cost effective and environment friendly manner.

EXAMPLES

Example 1 : Preparation of amorphous form of eliglustat hemitartarate.

500mg of eliglustat hemitartarate was dissolved in 14 mL of dichloromethane at 26°C and stirred for 15 min. The solution is filtered to remove the undissolved particles and the filtrate is distilled under reduced pressure at 45°C. After distillation the solid was dried under vacuum at 45°C.

Example 2: Preparation of amorphous form of eliglustat hemitartarate.

500mg of eliglustat hemitartarate was dissolved in 70 mL of ethanol and stirred for 15 min at 25° – 30°C. The solution is filtered to remove the undissolved particles and the filtrate is distilled under reduced pressure at 48°C. After distillation the solid was dried under vacuum at 48°C.

Example 3: Preparation of amorphous form of eliglustat hemitartarate.

500mg of eliglustat hemitartarate was dissolved in 20 mL of methanol and stirred for 15 min at 25° – 30°C. The solution is filtered to remove the undissolved particles and the filtrate is distilled under reduced pressure at 48°C. After distillation the solid was dried under vacuum at 48°C.

Example 4: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate and PVP-K30.

500mg of eliglustat hemitartarate and 500mg of PVP-K30 was dissolved in 20 mL of methanol and stirred for 10 min at 25° – 30°C. The solution is filtered to remove the undissolved particles and the filtrate is distilled under reduced pressure at 48°C. After distillation the solid is dried under vacuum at 48°C.

Example 5: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate and hydroxy propyl cellulose.

500mg of eliglustat hemitartarate and 500 mg of hydroxy propyl cellulose was dissolved in 30 ml of methanol and stirred for 10 min at 25° – 30°C. The solution is distilled under reduced pressure at 49°C. After distillation the solid is dried under vacuum at 49°C.

Example 6: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate and hydroxy propyl methyl cellulose.

500mg of eliglustat hemitartarate and 500 mg of hydroxy propyl methyl cellulose was dissolved in 30 mL of methanol and stirred for 10 min at 25° – 30°C. The solution is distilled under reduced pressure at 48°C. After distillation the solid is dried under vacuum at 48°C.

Example 7 Preparation of amorphous form of eliglustat hemitartarate.

3g of eliglustat hemitartarate was dissolved in 75 mL of methanol and stirred at 25°C for dissolution. The solution was filtered to remove the undissolved particles and the filtrate is subjected for spray drying at inlet temperature of 70°C and outlet temperature of 42°C to afford the title compound.

Example 8: Preparation of amorphous form of eliglustat hemitartarate.

500mg of eliglustat hemitartarate was dissolved in 30 mL of isopropanol and stirred at 56°C for dissolution. The solution was filtered to remove the undissolved particles and the filtrate is subjected to complete distillation under reduced pressure and drying at about 56°C to afford the title compound.

Example 9: Preparation of amorphous form of eliglustat hemitartarate.

1 g of eliglustat hemitartarate was provided in 40 mL of ethyl acetate and stirred at about 63°C. Then methanol (5 mL) is added at the same temperature to obtain clear solution which was filtered to remove the undissolved particles. Then additional quantity of methanol (5mL) is added to the filtrate and the filtrate was again filtered to remove particles. The obtained filtrate was subjected to complete distillation under reduced pressure and drying at about 57°C to afford the title compound.

Example 10: Preparation of amorphous form of eliglustat hemitartarate.

1 g of eliglustat hemitartarate was provided in 40 mL of acetone and stirred at about 55°C followed by addition of methanol (15 mL). The mixture is stirred at 55°C for clear solution and filtered to remove the undissolved particles. The obtained filtrate was subjected to complete distillation under reduced pressure and drying at about 57°C to afford the title compound.

Example 11 : Preparation of amorphous form of eliglustat hemitartarate.

1 g of eliglustat hemitartarate was provided in 25 mL of isopropyl alcohol and 25 mL of ethanol. The mixture was stirred at about 58°C for dissolution and filtered to remove the undissolved particles. The obtained filtrate was subjected to complete distillation under reduced pressure and drying at about 57°C to afford the title compound.

Example 12 Preparation of amorphous form of eliglustat hemitartarate.

5g of eliglustat hemitartarate was provided in 300 mL of isopropyl alcohol and stirred at about 59°C for dissolution. The solution was filtered to remove the undissolved particles and the filtrate is subjected for spray drying at inlet temperature of 65°C and outlet temperature of 37°C to afford the title compound according to Fig. 6

Example 13: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate and Copovidone

500mg of eliglustat hemitartarate and 500mg of Copovidone were dissolved in 30 mL of methanol and stirred for clear solution, then filtered to make it particle free. The solvent from the filtrate was evaporated under reduced pressure at 45°C and obtained solid was subjected to drying at 45°C to afford the title solid. The resulting dispersion was found to be amorphous by X-ray powder diffraction.

Example 14: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate and Copovidone

2g of eliglustat hemitartarate and 2g of Copovidone were dissolved in 100 mL of methanol and stirred for clear solution, then filtered to make it particle free. The solvent from the filtrate was subjected to spray drying at inlet temperature of 70 at 45°C and outlet temperature of 42°C to afford the title compound. The resulting dispersion was found to be amorphous by X-ray powder diffraction.

Example 15: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate

2g of eliglustat hemitartarate was charged in 40 mL of methanol followed by addition of 2g of PVP K-30. The mixture was stirred for clear solution and filtered to make it particle free, the bed was washed with 20 mL of methanol. Then 2g of Syloid is added to the filtrate and filtrate is subjected to distillation under reduced pressure at about 57°C and obtained solid was subjected to drying at about 57°C to afford the title solid. The resulting dispersion was found to be amorphous by X-ray powder diffraction according to Fig. 7a. The said dispersion is kept at 25°C under 40% relative humidity for 24 hours and PXRD was recorded and found to be amorphous according to Fig 7b.

Example 16: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate

2g of eliglustat hemitartarate was charged in 40 mL of methanol followed by addition of 2g of Copovidone. The mixture was stirred for clear solution and filtered to make it particle free, the bed was washed with 20 mL of methanol. Then 2g of Syloid is added to the filtrate and filtrate is subjected to distillation under reduced pressure at about 57°C and obtained solid was subjected to drying at about 57°C to afford the title solid. The resulting dispersion was found to be amorphous by X-ray powder diffraction according to Fig. 8a. The said dispersion is kept at 25°C under 40% relative humidity for 24 hours and PXRD was recorded and found to be amorphous according to Fig. 8b and D90 of the resultant solid is about 437 microns.

Example 17: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate and Syloid

1 g of eliglustat hemitartarate was dissolved in 25 ml_ of methanol and filtered to make it particle free. Then 1 g of Syloid 244 FPNF was added to the filtrate and solvent from the filtrate was evaporated under reduced pressure at 56°C and obtained solid was subjected to drying at 56°C to afford the title solid. The resulting dispersion was found to be amorphous by X-ray powder diffraction according to Fig. 9 and D90 of the resultant solid is about 4 microns.

Example 18: Preparation of a solid dispersion comprising an amorphous form of eliglustat hemitartarate and Syloid

1 g of eliglustat hemitartarate was dissolved in 25 ml_ of methanol and filtered to make it particle free. Then 500mg of Syloid 244 FPNF was added to the filtrate and solvent from the filtrate was evaporated under reduced pressure at 56°C and obtained solid was subjected to drying at 56°C to afford the title solid. The resulting dispersion was found to be amorphous by X-ray powder diffraction.

PATENT

(WO2015059679) IMPROVED PROCESS FOR THE PREPARATION OF ELIGLUSTAT

WO2015059679

DR. REDDY’S LABORATORIES LIMITED [IN/IN]; 8-2-337, Road No. 3, Banjara Hills Hyderabad 500034 (IN)

JAVED, Iqbal; (IN).
DAHANUKAR, Vilas Hareshwar; (IN).
ORUGANTI, Srinivas; (IN).
KANDAGATLA, Bhaskar; (IN)

Eliglustat tartrate (Genz-1 12638) is a glucocerebroside (glucosylceramide) synthase inhibitor for the treatment of gaucher disease and other lysosomal storage disorders, which is currently under development.

Eliglustat is chemically known as 1 R, 2R-Octanoic acid [2-(2′, 3′-dihydro-benzo [1 , 4] dioxin-6′-yl)-2-hydroxy-1 -pyrrolidin-1 -ylmethyl]-ethyl]-amide, having a structural formula I depicted here under.

Formula I

Eliglustat hemitartrate (Genz-1 12638) development by Genzyme, is a glucocerebroside (glucosylceramide) synthase inhibitor for the treatment of Gaucher disease and other lysosomal storage disorders. Eliglustat hemitartrate is orally active with potent effects on the primary identified molecular target for type 1 Gaucher disease and other glycosphingolipidoses, appears likely to fulfill high expectations for clinical efficacy. Gaucher disease belongs to the class of lysosomal diseases known as glycosphingolipidoses, which result directly or indirectly from the accumulation of glycosphingolipids, many hundreds of which are derived from glucocerebroside. The first step in glycosphingolipid biosynthesis is the formation of glucocerebroside, the primary storage molecule in Gaucher disease, via glucocerebroside synthase (uridine diphosphate [UDP] – glucosylceramide glucosyl transferase). Eliglustat hemitartrate is based on improved inhibitors of glucocerebroside synthase.

U.S. patent No. 7,196,205 (herein described as US’205) discloses a process for the preparation of eliglustat or a pharmaceutically acceptable salt thereof. In this patent, eliglustat was synthesized via a seven-step process involving steps in that sequence: (i) coupling S-(+)-2-phenyl glycinol with phenyl bromoacetate followed by column chromatography for purification of the resulting intermediate, (ii) reacting the resulting (5S)-5-phenylmorpholin-2-one with 1 , 4-benzodioxan-6-carboxaldehyde to obtain a lactone, (iii) opening the lactone of the oxazolo-oxazinone cyclo adduct via reaction with pyrrolidine, (iv) hydrolyzing the oxazolidine ring, (v) reducing the amide to amine to obtain sphingosine like compound, (vi) reacting the resulting amine with octanoic acid and N-hydroxysuccinimide to obtain crude eliglustat, (vii) purifying the crude eliglustat by repeated isolation for four times from a mixture of ethyl acetate and n-heptane.

U.S. patent No. 6855830, 7265228, 7615573, 7763738, 8138353, U.S. patent application publication No. 2012/296088 disclose processes for preparation of eliglustat and intermediates thereof.

U.S. patent application publication No. 2013/137743 discloses (i) a hemitartrate salt of eliglustat, (ii) a hemitartrate salt of eliglustat, wherein at least 70% by weight of the salt is crystalline, (iii) a hemitartrate salt of Eliglustat, wherein at least 99% by weight of the salt is in a single crystalline form.

It is also an objective of the present application to provide an improved process for the preparation of eliglustat and a pharmaceutically acceptable salt thereof which is high yielding, simple, cost effective, environment friendly and commercially viable by avoiding repeated cumbersome and lengthy purification steps. It is a further objective of the present application to provide crystalline forms of eliglustat free base and its salts.

Example 6: Preparation of Eliglustat {(1 R, 2R)-Octanoic acid[2-(2′,3′-dihydro-benzo [1 , 4] dioxin-6′-yl)-2-hydroxy-1 -pyrrolidin-1-ylmethyl-ethyl]-amide}.

(1 R, 2R)-2-Amino-1 -(2′, 3′-dihydro-benzo [1 , 4] dioxin-6′-yl)-3-pyrrolidin-1 -yl-propan-1 -ol (15g) obtained from above stage 5 was dissolved in dry dichloromethane (150ml) at room temperature under nitrogen atmosphere and cooled to 10-15° C. Octanoic acid N-hydroxy succinimide ester (13.0 g)was added to the above reaction mass at 10-15° C and stirred for 15 min. The reaction mixture was stirred at room temperature for 16h-18h. Progress of the reaction was monitored by thin layer chromatography. After completion of reaction, the reaction mixture was cooled to 15°C and diluted with 2M NaOH solution (100 ml_) and stirred for 20 min at 20 °C. The organic layer was separated and washed with 2M sodium hydroxide (3x90ml).The organic layer was dried over anhydrous sodium sulphate (30g) and concentrated under reduced pressure at a water bath temperature of 45°C to give the crude compound (20g).The crude is again dissolved in methyl tertiary butyl ether (25 ml_) and precipitated with Hexane (60ml). It is stirred for 10 min, filtered and dried under vacuum to afford Eliglustat as a white solid (16g). Yield: 74%, Mass (m/zj: 404.7 HPLC (% Area Method): 97.5 %, ELSD (% Area Method): 99.78%, Chiral HPLC (% Area Method): 99.78 %.

Example 7: Preparation of Eliglustat oxalate.

Eliglustat (5g) obtained from above stage 6 is dissolved in Ethyl acetate (5ml) at room temperature under nitrogen atmosphere. Oxalic acid (2.22g) dissolved in ethyl acetate (5ml) was added to the above solution at room temperature and stirred for 14h. White solid observed in the reaction mixture was filtered and dried under vacuum at room temperature for 1 h to afford Eliglustat oxalate as a white solid (4g). Yield: 65.46%, Mass (m/zj: 404.8 [M+H] +> HPLC (% Area Method): 95.52 %, Chiral HPLC (% Area Method): 99.86 %

G.V. Prasad, chairman, Dr Reddy’s Laboratories

//////////////New patent, WO 2016001885, Dr Reddy’s Laboratories Ltd, Eliglustat hemitartarate, WO 2015059679