Solid forms of selective androgen receptor modulators

1. A process for the preparation of a paracrystalline form B′ of compound (S)—N-(4-cyano-3-(trifluoromethyl)phenyl)-3-(4-cyanophenoxy)-2-hydroxy-2-methylpropanamide, comprising stiffing a suspension of a crystalline form of (S)—N-(4-cyano-3-(trifluoromethyl)phenyl)-3-(4-cyanophenoxy)-2-hydroxy-2-methylpropanamide in water at ambient temperature of about 20-30° C. for at least 0.5 hours, to obtain said paracrystalline compound.

2. A process for the preparation of a paracrystalline form B′ of compound (S)—N-(4-cyano-3-(trifluoromethyl)phenyl)-3-(4-cyanophenoxy)-2-hydroxy-2-methylpropanamide, comprising stirring a suspension of solid form A in water at 37° C. overnight, wherein said solid form A is characterized by: an X-ray powder diffraction pattern comprising peaks at °2θ (d value Å) angles of about 5.6 (15.9), 7.5 (11.8), 8.6 (10.3), 9.9 (8.9), 12.4 (7.1), 15.0 (5.9), 16.7 (5.3), 17.3 (5.1), 18.0 (4.9), 18.5 (4.8), 19.3 (4.6), 19.8 (4.5), 20.6 (4.3), 21.8 (4.1), 22.3 (4.0), 23.4 (3.8), 23.9 (3.7), 24.6 (3.6), 24.9 (3.6), 25.4 (3.5), 26.0 (3.4), 26.5 (3.4), 27.8 (3.2).

3. A paracrystalline form B′ of (S)—N-(4-cyano-3-(trifluoromethyl)phenyl)-3-(4-cyanophenoxy)-2-hydroxy-2-methylpropanamide compound prepared according to the process of claim 2 , wherein said paracrystalline form B′ is characterized by:

a. an X-ray powder diffraction pattern displaying a broad halo with two harmonic peaks between 15-25 °2θ; and

b. a phase transition point of about 55° C. as determined by differential scanning calorimetry (DSC).

4. The paracrystalline form of claim 3 , whereby said form is characterized by an X-ray diffraction pattern as depicted in FIG. 4 d.

5. The paracrystalline form of claim 3 , whereby said form is characterized by its solubility in water being between 20-30 mg/L at 22° C.

6. A paracrystalline form B′ of (S)—N-(4-cyano-3-(trifluoromethyl)phenyl)-3-(4-cyanophenoxy)-2-hydroxy-2-methylpropanamide compound prepared according to the process of claim 1 , wherein said paracrystalline form B′ is characterized by:

a. an X-ray powder diffraction pattern displaying a broad halo with two harmonic peaks between 15-25 °2θ and

b. a phase transition point of about 55° C. as determined by differential scanning calorimetry (DSC).

7. The paracrystalline form of claim 6 , wherein said form is characterized by an X-ray diffraction pattern as depicted in FIG. 4 d.

8. The paracrystalline form of claim 6 , wherein said form is characterized by its solubility in water being between 20-30 mg/L at 22° C.