Amorphous trisodium sacubitril valsartan and a process for the preparation thereof

1. A process for the preparation of amorphous trisodium sacubitril valsartan, comprising the steps of:

a. dissolving trisodium sacubitril valsartan in a solvent selected from the group consisting of an alcohol solvent, water, and mixtures thereof;

b. removing the solvent; and

c. isolating amorphous trisodium sacubitril valsartan.

2. The process according to claim 1 , wherein the alcohol solvent is selected from the group consisting of methanol, ethanol, propanol, isopropanol and mixtures thereof.

3. A process for the preparation of amorphous trisodium sacubitril valsartan, comprising the steps of:

a. dissolving sacubitril valsartan trisodium hemipentahydrate in a first solvent to form a solution, wherein dissolving trisodium sacubitril valsartan is achieved at an elevated temperature from about 90° C. to about 110° C.;

b. adding a second solvent to the solution; and

c. isolating amorphous trisodium sacubitril valsartan.

4. The process according to claim 3 , wherein the first solvent is a polar solvent selected from the group consisting of an alcohol solvent, an ester solvent, a ketone solvent, and mixtures thereof and the second solvent is a non-polar solvent selected from the group consisting of an ether solvent, a hydrocarbon solvent, and mixtures thereof.

5. The process according to claim 4 , wherein the alcohol solvent is selected from the group consisting of methanol, ethanol, isopropanol, and mixtures

thereof; the ester solvent is selected from the group consisting of methyl acetate, ethyl acetate, isopropyl acetate, tert-butyl acetate, and mixtures thereof; the ketone solvent is selected from the group consisting of acetone, methyl ethyl ketone, methyl isobutyl ketone, and mixtures thereof; the ether solvent is selected from the group consisting of diethyl ether, diisopropyl ether, methyl tert-butyl ether, and mixtures thereof; and the hydrocarbon solvent is selected from the group consisting of pentane, hexane, heptane, cyclohexane, and mixtures thereof.

6. A process for the preparation of an amorphous form of trisodium sacubitril valsartan comprising the steps of:

a. dissolving sacubitril and valsartan in a solvent to form a solution, wherein the solvent is a polar solvent selected from the group consisting of tetrahydrofuran, acetone, dimethylformamide, ethyl acetate, dimethyl sulfoxide, and mixtures thereof;

b. adding a sodium source to the solution;

c. removing the solvent; and

d. isolating amorphous trisodium sacubitril valsartan.

7. The process according to claim 6 , wherein the solvent is tetrahydrofuran.

8. The process according to claim 6 , wherein the sodium source is selected from the group consisting of sodium hydroxide, sodium alkoxides, and sodium ethylhexanoate.

9. A process for the preparation of amorphous trisodium sacubitril valsartan, comprising the steps of:

a. dissolving sacubitril and valsartan in a first solvent to form a solution;

b. adding a sodium source to the solution;

c. removing the first solvent;

d. adding a second solvent to form a second solution, wherein the second solvent is an organic solvent;

e. adding a third solvent to the second solution, wherein the third solvent is a non-polar solvent; and

f. isolating amorphous trisodium sacubitril valsartan.

10. The process according to claim 9 , wherein the first solvent is a polar solvent selected from the group consisting of an alcohol solvent, an ether solvent, an ester solvent, a ketone solvent, an amide solvent, dimethyl sulfoxide, and mixtures thereof and the second solvent is a polar solvent selected from the group consisting of an alcohol solvent, a ketone solvent, an ester solvent, and mixtures thereof.

11. The process according to claim 10 , wherein each alcohol solvent is selected from the group consisting of methanol, ethanol, isopropanol, and mixtures thereof; the ether solvent is selected from the group consisting of tetrahydrofuran, diethyl ether, 1,4-dioxane, methyl tert-butyl ether, and mixtures thereof; each ester solvent is selected from the group consisting of methyl acetate, ethyl acetate, isopropyl acetate, tert-butyl acetate, and mixtures thereof; each ketone solvent is selected from the group consisting of acetone, methyl ethyl ketone, methyl isobutyl ketone, and mixtures thereof; and the amide solvent is selected from the group consisting of dimethylacetamide, dimethylformamide, and mixtures thereof.

12. The process according to claim 9 , wherein the sodium source is selected from the group consisting of sodium hydroxide, sodium alkoxides, and sodium 2-ethylhexanoate.

13. The process according to claim 9 , wherein the first solvent is removed by evaporation.

14. The process according to claim 9 , wherein the third solvent is a non-polar solvent selected from the group consisting of an alkane, a non-polar ether, and mixtures thereof.

15. The process according to claim 14 , wherein the alkane solvent is selected from the group consisting of n-pentane, n-heptane, n-hexane, and mixtures thereof and the non-polar ether solvent is selected from the group consisting of methyl tert-butyl ether, diethyl ether, diisopropyl ether, and mixtures thereof.