How is 2-[(4-Methoxyphenyl)amino]acetohydrazide (CAS: 79476-73-6) typically synthesized?

2-[(4-Methoxyphenyl)amino]acetohydrazide is typically synthesized via the reaction of 4-methoxyaniline with acetic anhydride followed by hydrazinolysis. The synthesis involves the stepwise addition of acetic anhydride to 4-methoxyaniline, followed by treatment with hydrazine hydrate to form the final product. The reaction is carried out in a solvent such as ethanol, and the product is isolated by filtration and recrystallization.