AbstractProcedures are described for the high pressure carbonation of substituted 3‐pyridinols, yielding the corresponding pyridine carboxylic acids. Treatment ofo‐aminohydroxypyridinecarboxylic acid with cyanogen and with phosgene, respectively, gave access to oxazolo[4,5‐b]pyridine derivatives. The synthesis of 3‐amino‐6‐methyl‐2‐pyridinecarboxylic acid was accomplished by heating 3‐hydroxy‐6‐methyl‐2‐pyridinecarboxyl