Furo[2,3-b]pyridine-5,6-dicarboxylic acid → Furo[2,3-b]pryidine-5,6-Dicarboxylic anhydride

Participants

Reaction Steps

Furo[2,3-b]pyridine-5,6-dicarboxylic acid (6.7 g, 0.032 mol) is heated at 60° C. for 30 minutes in acetic anhydride (150 mL). The reaction mixture is cooled to room temperature and concentrated in vacuo and the residue triturated with cyclohexane-ether (5:1), filtered off and dried to give 5.35 g furo[2,3-b]pyridine-5,6-dicarboxylic acid anhydride.

Provenance & Evidence