Disclosed herein are polymorphic and amorphous forms of anhydrate, hydrate, and solvates of (R)-2-hydroxy-2-methyl-4-(2,4,5-trimethyl-3,6-dioxocyclohexa-1,4-dienyl)butanamide and methods of using such compositions for treating or suppressing oxidative stress disorders, including mitochondrial disorders, impaired energy processing disorders, neurodegenerative diseases and diseases of aging. Further disclosed are methods of making such polymorphic and amorphous forms.

Disclosed herein are polymorphic and amorphous forms of anhydrate, hydrate, and solvates of (R)-2-hydroxy-2-methyl-4-(2,4,5-trimethyl-3,6-dioxocyclohexa-1,4-dienyl)butanamide and methods of using such compositions for treating or suppressing oxidative stress disorders, including mitochondrial disorders, impaired energy processing disorders, neurodegenerative diseases and diseases of aging. Further disclosed are methods of making such polymorphic and amorphous forms.

The present invention relates generally to compositions and methods for treating neurodegenerative diseases and disorders, particularly ophthalmic diseases and disorders. Provided herein are styrenyl derivative compounds, including but not limited to stilbene derivative compounds, and compositions comprising these compounds, that are useful for treating and preventing ophthalmic diseases and disorders, including age-related macular degeneration (AMD) and Stargardt's Disease.

The present invention relates generally to compositions and methods for treating neurodegenerative diseases and disorders, particularly ophthalmic diseases and disorders. Provided herein are styrenyl derivative compounds, including but not limited to stilbene derivative compounds, and compositions comprising these compounds, that are useful for treating and preventing ophthalmic diseases and disorders, including age-related macular degeneration (AMD) and Stargardt's Disease.

The application is directed to efficient and economical processes as described in more detail below for the preparation of the beta 3 agonists of the formula of I-7 and intermediate compounds that can be used for making these agonists. The present disclosure relates to a process for making beta-3 agonists and intermediates using ketoreductase (KRED) biocatalyst enzymes and methods of using the biocatalysts.

The application is directed to efficient and economical processes as described in more detail below for the preparation of the beta 3 agonists of the formula of I-7 and intermediate compounds that can be used for making these agonists. The present disclosure relates to a process for making beta-3 agonists and intermediates using ketoreductase (KRED) biocatalyst enzymes and methods of using the biocatalysts.

The application is directed to efficient and economical processes as described in more detail below for the preparation of the beta 3 agonists of the formula of I-7 and intermediate compounds that can be used for making these agonists. The present disclosure relates to a process for making beta-3 agonists and intermediates using ketoreductase (KRED) biocatalyst enzymes and methods of using the biocatalysts.

The application is directed to efficient and economical processes as described in more detail below for the preparation of the beta 3 agonists of the formula of I-7 and intermediate compounds that can be used for making these agonists. The present disclosure relates to a process for making beta-3 agonists and intermediates using ketoreductase (KRED) biocatalyst enzymes and methods of using the biocatalysts.

The present invention relates to a process for preparation of dexmethylphenidate hydrochloride from racemic methylphenidate. The process involves the treatment of racemic mixture of dl-threo-methylphenidate base in the presence of di-pivaloyl-D-tartaric acid (D-DPTA) in a solvent to isolate dipivaloyl tartrate salt of d-threo-methylphenidate. The dipivaloyl tartrate salt of d-threo-methylphenidate is treated with a base to obtain a d-threo-methylphenidate base, which is extracted using a suitable solvent. The d-threo-methylphenidate base is treated with hydrochloric acid-isopropyl alcohol solution to obtain slurry of d-threo-methylphenidate hydrochloride also known as dexmethylphenidate hydrochloride. The dexmethylphenidate hydrochloride slurry is filtered and washed with acetone. The invention also discloses a process for recovery of D-DPTA from the salt mother liquor and from the spent aqueous layer. The process is economical, environmental friendly and results in increased yield and optically pure dexmethylphenidate hydrochloride.

The present invention relates to a process for preparation of dexmethylphenidate hydrochloride from racemic methylphenidate. The process involves the treatment of racemic mixture of dl-threo-methylphenidate base in the presence of di-pivaloyl-D-tartaric acid (D-DPTA) in a solvent to isolate dipivaloyl tartrate salt of d-threo-methylphenidate. The dipivaloyl tartrate salt of d-threo-methylphenidate is treated with a base to obtain a d-threo-methylphenidate base, which is extracted using a suitable solvent. The d-threo-methylphenidate base is treated with hydrochloric acid-isopropyl alcohol solution to obtain slurry of d-threo-methylphenidate hydrochloride also known as dexmethylphenidate hydrochloride. The dexmethylphenidate hydrochloride slurry is filtered and washed with acetone. The invention also discloses a process for recovery of D-DPTA from the salt mother liquor and from the spent aqueous layer. The process is economical, environmental friendly and results in increased yield and optically pure dexmethylphenidate hydrochloride.