How is 4-Chloro-3-methoxy-2-methylpyridine 1-oxide (CAS: 122307-41-9) typically synthesized?

4-Chloro-3-methoxy-2-methylpyridine 1-oxide (CAS: 122307-41-9) is typically synthesized through the methylation of 4-chloro-3-methoxy-2-pyridinecarbaldehyde followed by oxidation. This involves the use of methyl iodide and a strong base, such as sodium hydride, in an organic solvent. The reaction is conducted at room temperature, and the final product is obtained by oxidizing the intermediate with potassium permanganate or a similar oxidizing agent.