Abstract
Heating of 2-halopyridine-3,4-dicarboxylic acids in propionic anhydride led to the formation of 4-halofuro[3,4-c]pyridine-1,3-diones as a result of intramolecular dehydration of the vicinal carboxy groups. The subsequent reduction of 4-halofuro[3,4-c]pyridine-1,3-diones with sodium tetrahydridoborate in THF at room temperature afforded 4-halofuro[3,4-c]pyridin-3(1H)-ones as the major products.
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