How is 4,5-Dimethoxy-2-nitrobenzaldehyde (CAS: 20357-25-9) typically synthesized?

4,5-Dimethoxy-2-nitrobenzaldehyde (CAS: 20357-25-9) can be synthesized via the reduction of 4,5-dimethoxy-2-nitrobenzoic acid with a suitable reducing agent like sodium borohydride. The reaction involves adding anhydrous sodium borohydride to a solution of the acid in a polar solvent like methanol or ethanol. The yield is typically around 85-90%, and the reaction is usually carried out under mild conditions.