p-Toluenesulfonic acid → 2-(5-Hydroxy-2,6-dioxopiperid-3-yl)-4-methylisoindoline-1,3-dione

Participants

Reaction Steps

A solution of 3-(4-methyl-1,3-dioxoisoindolin-2-yl)-2,6-dioxo-5-acetoxypiperidine (1 g, 3.5 mmol) and p-toluenesulfonic acid (0.33 g, 1.8 mmol) in methanol (10 mL) is heated at reflux for 5 hours. The solvent is removed in vacuo to give 2-(5-hydroxy-2,6-dioxopiperid-3-yl)-4-methylisoindoline-1,3-dione. The product can be further purified by column chromatography.

Provenance & Evidence