Acetic Anhydride → Furo[3,4-b]pyridine-5,7-dione, 3-ethyl-

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Reaction Steps

A mixture of the above carboxylic acid (3.0 g, 15.37 mmol) and acetic anhydride (15 ml) is heated until the acid is dissolved. The mixture is then concentrated under vacuum, and the residue is dissolved in ether, stirred, filtered, concentrated and dried to give 5-ethyl-2,3-pyridinedicarboxylic anhydride.

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