Highly purified batches of pharmaceutical grade migalastat and methods of producing the same

1. A method of producing a batch of migalastat hydrochloride, the method comprising:

performing a first crystallization step comprising dissolving intermediate grade migalastat hydrochloride in water and then adding ethanol to induce crystallization, providing a first crystallized migalastat hydrochloride;

performing a second crystallization step comprising dissolving the first crystallized migalastat hydrochloride in water and then adding ethanol to induce crystallization, providing a second crystallized migalastat hydrochloride; and

isolating the batch of migalastat hydrochloride.

2. The method of claim 1 , wherein the first crystallization comprises:

dissolving the intermediate grade migalastat hydrochloride in water at a first crystallization temperature to provide dissolved intermediate grade migalastat;

adding ethanol to the dissolved intermediate grade migalastat to induce crystallization, providing a slurry comprising a first crystallized migalastat hydrochloride;

isolating the first crystallized migalastat hydrochloride when the slurry comprising the first crystallized migalastat hydrochloride reaches a first isolation temperature;

filtering the first crystallized migalastat hydrochloride;

washing the filtered first crystallized migalastat hydrochloride with ethanol; and

drying the washed first crystallized migalastat hydrochloride.

3. The method of claim 2 , wherein the second crystallization comprises:

dissolving the first crystallized migalastat hydrochloride in water at a second crystallization temperature to provide a second dissolved migalastat product;

adding a first portion of ethanol to the second dissolved migalastat product to induce crystallization, providing a slurry comprising a second crystallized migalastat hydrochloride;

adding a second portion of ethanol to the slurry comprising the second crystallized migalastat hydrochloride after a hold time;

isolating the second crystallized migalastat hydrochloride when the slurry comprising the second crystallized migalastat hydrochloride reaches a second isolation temperature;

filtering the second crystallized migalastat hydrochloride;

washing the filtered second crystallized migalastat hydrochloride with ethanol; and

drying the washed second crystallized migalastat hydrochloride to produce the batch of migalastat hydrochloride.

4. The method of claim 1 , wherein the intermediate grade migalastat hydrochloride, the first crystallized migalastat hydrochloride, or both, is dissolved in an amount of water which is from 1.0 to 1.6 times the weight of the corresponding migalastat hydrochloride.

5. The method of claim 4 , wherein the amount of water is from 1.1 to 1.4 times the weight of the corresponding migalastat hydrochloride.

6. The method of claim 4 , wherein the amount of water is 1.3 times the weight of the corresponding migalastat hydrochloride.

7. The method of claim 3 , wherein the first crystallization temperature, the second crystallization temperature, or both, is within a range from 30° C. to 60° C.

8. The method of claim 7 , wherein the first crystallization temperature, the second crystallization temperature, or both, is within a range from 40° C. to 60° C.

9. The method of claim 7 , wherein the first crystallization temperature, the second crystallization temperature, or both, is about 50° C.

10. The method of claim 2 , wherein the amount of ethanol added to the dissolved intermediate grade migalastat is from 1 to 11.4 times the weight of migalastat hydrochloride present in the dissolved intermediate grade migalastat.

11. The method of claim 10 , wherein a total amount of ethanol, added as the first and second portion of ethanol, is from 1 to 11.4 times the weight of migalastat hydrochloride present in the second dissolved migalastat product.

12. The method of claim 11 , wherein the amount of ethanol, the total amount of ethanol, or both, is from 4.8 to 11.4 times the weight of the corresponding migalastat hydrochloride.

13. The method of claim 11 , wherein the amount of ethanol, the total amount of ethanol, or both, is from 8.4 to 10.6 times the weight of the corresponding migalastat hydrochloride.

14. The method of claim 11 , wherein the amount of ethanol, the total amount of ethanol, or both, is about 9.5 times the weight of the corresponding migalastat hydrochloride.

15. The method of claim 11 , wherein the first portion of ethanol is 1.8 to 2.0 times the weight of the migalastat hydrochloride present in the second dissolved migalastat product.

16. The method of claim 15 , wherein the first portion of ethanol is 1.9 times the weight of the migalastat hydrochloride present in the second dissolved migalastat product.

17. The method of claim 3 , wherein the second portion of ethanol is 6.7 to 8.4 weights of ethanol times the weight of the migalastat hydrochloride present in the slurry comprising the second crystallized migalastat hydrochloride.

18. The method of claim 3 , wherein the first isolation temperature, the second isolation temperature, or both, is within a range from 5° C. to 35° C.

19. The method of claim 18 , wherein the first isolation temperature, the second isolation temperature, or both, is about 20° C.

20. The method of claim 2 , wherein the ethanol is added to the dissolved intermediate grade migalastat over a period from 0 to 65 minutes.

21. The method of claim 20 , wherein the ethanol is added over a period of 60 minutes.

22. The method of claim 20 , wherein the first portion of ethanol is added over a period from 5 minutes to 60 minutes.

23. The method of claim 3 , wherein the hold time is from 5 min to 60 min.

24. The method of claim 1 , wherein the batch of migalastat hydrochloride is pharmaceutical grade.

25. The method of claim 3 , wherein the batch of migalastat hydrochloride is pharmaceutical grade.

26. A method of producing a batch of migalastat hydrochloride, the method comprising performing a first crystallization and a second crystallization, wherein:

the first crystallization comprises:

dissolving intermediate grade migalastat hydrochloride in water at a first crystallization temperature to produce dissolved intermediate grade migalastat hydrochloride;

adding ethanol to the dissolved intermediate grade migalastat hydrochloride to induce crystallization, providing a slurry comprising a first crystallized migalastat hydrochloride;

isolating the first crystallized migalastat hydrochloride;

dissolving the first crystallized migalastat hydrochloride in water at a second crystallization temperature to produce a second dissolved migalastat product;

adding a first portion of ethanol to the second dissolved migalastat product to induce crystallization, providing a slurry comprising a second crystallized migalastat hydrochloride;

adding a second portion of ethanol to the slurry comprising the second crystallized migalastat hydrochloride after a hold time; and

isolating the batch of migalastat hydrochloride.

27. The method of claim 26 , wherein the first crystallization temperature, the second crystallization temperature, or both, is within a range from 30° C. to 60° C.

28. The method of claim 26 , wherein the first isolation temperature, the second isolation temperature, or both, is within a range from 5° C. to 35° C.

29. The method of claim 26 , wherein the hold time is from 5 min to 60 min.

30. The method of claim 26 , wherein the batch of migalastat hydrochloride is pharmaceutical grade.