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Reagents and conditions: (a) NaH, DMF, 70 °C; (b) hydrazine hydrate, EtOH, 110 °C; (c) potassium 3-methoxy-3-oxopropanoate, CDI, MgCl2, MeCN, 0 °C; (d) AcOH, 110 °C; (e) phosphorus pentasulfide, dioxane, 70 °C.
