4-amino-2-(2,6-dioxopiperidin-3-yl)-6-hydroxyisoindole-1,3-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In yet another embodiment, the process provided herein for preparing 4-amino-2-(2,6-dioxopiperidin-3-yl)-6-hydroxyisoindoline-1,3-dione, or an enantiomer or a mixture of enantiomers thereof; or a pharmaceutically acceptable salt, solvate, hydrate, or polymorph thereof; comprises the step of reducing 2-(2,6-dioxopiperidin-3-yl)-6-hydroxy-4-nitroisoindoline-1,3-dione with hydrogen in the presence of (i) a catalyst, in one embodiment, Pd/C; in (ii) a solvent, in one embodiment, THF; to form 4-amino-2-(2,6-dioxopiperidin-3-yl)-6-hydroxyisoindoline-1,3-dione. an enantiomer or a mixture of enantiomers

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In yet another embodiment, the process provided herein for preparing 4-amino-2-(2,6-dioxopiperidin-3-yl)-6-hydroxyisoindoline-1,3-dione, or an enantiomer or a mixture of enantiomers thereof; or a pharmaceutically acceptable salt, solvate, hydrate, or polymorph thereof; comprises the step of reducing 2-(2,6-dioxopiperidin-3-yl)-6-hydroxy-4-nitroisoindoline-1,3-dione with hydrogen in the presence of (i) a catalyst, in one embodiment, Pd/C; in (ii) a solvent, in one embodiment, THF; to form 4-amino-2-(2,6-dioxopiperidin-3-yl)-6-hydroxyisoindoline-1,3-dione. an enantiomer or a mixture of enantiomers

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In yet another embodiment, the process provided herein for preparing 4-amino-2-(2,6-dioxopiperidin-3-yl)-6-hydroxyisoindoline-1,3-dione, or an enantiomer or a mixture of enantiomers thereof; or a pharmaceutically acceptable salt, solvate, hydrate, or polymorph thereof; comprises the step of reducing 2-(2,6-dioxopiperidin-3-yl)-6-hydroxy-4-nitroisoindoline-1,3-dione with hydrogen in the presence of (i) a catalyst, in one embodiment, Pd/C; in (ii) a solvent, in one embodiment, THF; to form 4-amino-2-(2,6-dioxopiperidin-3-yl)-6-hydroxyisoindoline-1,3-dione. an enantiomer or a mixture of enantiomers